Home

Tutoring

Subjects

Live Classes

Study Coach

Essay Review

On-Demand Courses

Colleges

Games

Opening subject page...

Loading your content

← Back to quizzes

3rd Grade Reading

3rd Grade Reading Quiz: Determine Main Idea And Supporting Details

Practice Determine Main Idea And Supporting Details in 3rd Grade Reading with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Determine Main Idea And Supporting Details, giving you a quick way to practice the rules, question types, and explanations that matter most for 3rd Grade Reading.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

Question 1

Read the passage. Ancient Egypt was an advanced civilization. Egyptians built huge pyramids as tombs for pharaohs. They wrote with symbols called hieroglyphics. Farmers used the Nile River’s floods to water crops and grow food. Egyptian doctors also learned ways to treat sickness and injuries. Which sentence states the main idea?

  1. Egyptians built huge pyramids as tombs for pharaohs.
  2. They wrote with symbols called hieroglyphics.
  3. Ancient Egypt was an advanced civilization.
  4. Farmers used the Nile River’s floods to water crops.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify what the passage is mostly about and understand how details support that central message. The main idea is what the passage is mostly about - the central message or big idea. It's different from the topic (topic = what passage is about, like 'bats'; main idea = the point being made, like 'bats are helpful to the environment'). The main idea should be supported by most or all of the details in the passage. Supporting details are specific facts, examples, or evidence that support the main idea. Each key detail should relate to and help explain the main idea. Good readers identify the main idea by asking 'What is this passage mostly trying to tell me?' and then identify which details support that message. In this passage, the main idea is that ancient Egypt was an advanced civilization. This is the central message that the whole passage supports. The passage provides several key details: Egyptians built huge pyramids as tombs, they wrote with hieroglyphics, farmers used the Nile’s floods to water crops, and doctors learned to treat sickness and injuries. Each of these details gives examples of advancements in building, writing, agriculture, and medicine. Choice C is correct because this captures what the whole passage is about. Each detail in the passage - pyramids, hieroglyphics, using the Nile, and medical treatments - supports this central message. This is not too broad (it's more specific than just 'Egypt') and not too narrow (it covers all the details, not just one like pyramids). Choice A is incorrect because this is a supporting detail, not the main idea. While the passage does mention building pyramids, that's just one fact supporting the bigger idea that ancient Egypt was an advanced civilization. To help students: Teach the difference between topic (one word or phrase - bats, recycling) and main idea (complete thought - bats help the environment, recycling protects our planet). Use 'umbrella' analogy: main idea is the umbrella that covers all the details underneath. Practice finding main idea by asking 'What is this mostly about?' and checking if most details support that idea. Teach students to eliminate answers that are: too broad (just topic), too narrow (only one detail), or not supported by passage. Use graphic organizers: main idea in center, supporting details around it with arrows showing how each supports. Practice identifying where main idea appears: sometimes first sentence (topic sentence), sometimes last sentence (conclusion), sometimes middle, sometimes implied (reader must infer from details). Model think-aloud: 'Detail 1 says [X], detail 2 says [Y], detail 3 says [Z] - what do all these have in common? They all show that [main idea].' Teach students to ask: Would removing this detail change the main idea? (Key details: yes; minor details: no). Use color coding: highlight main idea in one color, supporting details in another. Practice with short passages, gradually increasing length. Watch for: Students who confuse topic with main idea, choose interesting details instead of main idea, select first or last sentence without checking if it's actually the main idea, or can't distinguish key details from minor facts. Provide explicit instruction in identifying central message and explaining how details support it.

Question 2

Read the passage. Thomas Edison helped create many useful inventions. He worked on the phonograph, which could record sound. He improved the electric light bulb so it lasted longer. He also helped build systems to bring electricity to homes and streets. Edison tested many ideas before finding what worked. Which detail does NOT support the main idea that Edison created useful inventions?

  1. He worked on the phonograph to record sound.
  2. He improved the electric light bulb.
  3. He tested many ideas before finding what worked.
  4. He liked to take long walks in the forest.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify what the passage is mostly about and understand how details support that central message. The main idea is what the passage is mostly about - the central message or big idea. It's different from the topic (topic = what passage is about, like 'Thomas Edison'; main idea = the point being made, like 'Thomas Edison helped create many useful inventions'). The main idea should be supported by most or all of the details in the passage. Supporting details are specific facts, examples, or evidence that support the main idea. Each key detail should relate to and help explain the main idea. Good readers identify the main idea by asking 'What is this passage mostly trying to tell me?' and then identify which details support that message. In this passage, the main idea is that Thomas Edison helped create many useful inventions. This is the central message that the whole passage supports. The passage provides several key details: he worked on the phonograph to record sound, improved the electric light bulb, helped build electrical systems, and tested many ideas. Each of these details shows Edison's work on useful inventions. Choice D is correct because this detail does NOT support the main idea that Edison created useful inventions. The statement 'He liked to take long walks in the forest' is not mentioned in the passage and doesn't relate to his inventions. Even if it were true, taking walks doesn't show how he created useful inventions - it's about his personal habits, not his innovative work. Choice A is incorrect as an answer to this question because it DOES support the main idea. The phonograph that could record sound is clearly one of Edison's useful inventions mentioned in the passage. To help students: Teach the difference between topic (one word or phrase - Edison, inventions) and main idea (complete thought - Edison created many useful inventions, Edison was a prolific inventor). Use 'umbrella' analogy: main idea is the umbrella that covers all the details underneath. Practice finding main idea by asking 'What is this mostly about?' and checking if most details support that idea. Teach students to eliminate answers that are: too broad (just topic), too narrow (only one detail), or not supported by passage. For 'does NOT support' questions, teach students to look for details that are either not in the passage or don't connect to the main idea. Model think-aloud: 'The main idea is about Edison's useful inventions. Does taking walks in the forest show he made useful inventions? No, it doesn't connect.' Practice identifying relevant vs. irrelevant details. Use T-charts: 'Supports Main Idea' vs. 'Doesn't Support Main Idea.' Teach students that supporting details must both be in the passage AND connect to the main idea. Watch for: Students who struggle with 'NOT' questions and choose supporting details instead, select any detail not in the passage without checking if it relates to main idea, or get confused by the reverse logic. Provide explicit practice with 'which does NOT' question formats.

Question 3

Read the passage.

Some animals survive winter by hibernating. During hibernation, an animal’s body slows down to save energy. Bears may sleep for many weeks and live off stored fat. Some bats hang in caves where it is safe and warm enough. When spring comes and food returns, these animals wake up and become active again.

What is the main idea of this passage?

  1. Bears are the biggest animals in the forest.
  2. Hibernation helps some animals survive winter.
  3. Caves are dark places underground.
  4. Animals like warm weather best.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify what the passage is mostly about and understand how details support that central message. The main idea is what the passage is mostly about - the central message or big idea. It's different from the topic (topic = what passage is about, like 'bats'; main idea = the point being made, like 'bats are helpful to the environment'). The main idea should be supported by most or all of the details in the passage. Supporting details are specific facts, examples, or evidence that support the main idea. Each key detail should relate to and help explain the main idea. Good readers identify the main idea by asking 'What is this passage mostly trying to tell me?' and then identify which details support that message. In this passage, the main idea is that some animals survive winter by hibernating. This is the central message that the whole passage supports. The passage provides several key details: during hibernation the body slows down to save energy, bears sleep for weeks using stored fat, bats hang in caves for safety and warmth, and animals wake up in spring when food returns. Each of these details explains how hibernation works and helps survival. Choice B is correct because this captures what the whole passage is about. Each detail in the passage - body slowing down, bears using fat, bats in caves, waking in spring - supports this central message. This is not too broad (it's more specific than just 'animals') and not too narrow (it covers all the details, not just one animal). Choice A is incorrect because this information is not stated or supported by the passage. To help students: Teach the difference between topic (one word or phrase - bats, recycling) and main idea (complete thought - bats help the environment, recycling protects our planet). Use 'umbrella' analogy: main idea is the umbrella that covers all the details underneath. Practice finding main idea by asking 'What is this mostly about?' and checking if most details support that idea. Teach students to eliminate answers that are: too broad (just topic), too narrow (only one detail), or not supported by passage. Use graphic organizers: main idea in center, supporting details around it with arrows showing how each supports. Practice identifying where main idea appears: sometimes first sentence (topic sentence), sometimes last sentence (conclusion), sometimes middle, sometimes implied (reader must infer from details). Model think-aloud: 'Detail 1 says [X], detail 2 says [Y], detail 3 says [Z] - what do all these have in common? They all show that [main idea].' Teach students to ask: Would removing this detail change the main idea? (Key details: yes; minor details: no). Use color coding: highlight main idea in one color, supporting details in another. Practice with short passages, gradually increasing length. Watch for: Students who confuse topic with main idea, choose interesting details instead of main idea, select first or last sentence without checking if it's actually the main idea, or can't distinguish key details from minor facts. Provide explicit instruction in identifying central message and explaining how details support it.

Question 4

Read the passage. Many desert animals have special ways to survive heat. Fennec foxes have large ears that help release heat. Some lizards hide under rocks during the hottest part of the day. Camels can store fat in their humps for energy when food is scarce. Many desert animals come out at night when it is cooler. Which detail supports the main idea that desert animals are adapted to heat?​

  1. Some lizards hide under rocks during the hottest part of the day.
  2. Deserts can be found on many continents.
  3. Some foxes live in forests with lots of rain.
  4. Rocks can be different shapes and sizes.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify which detail supports the stated main idea that desert animals are adapted to heat. Supporting details should directly relate to and provide evidence for the main idea. In this passage, the main idea is that desert animals have special ways to survive heat. The passage provides several key details: fennec foxes have large ears that release heat, lizards hide under rocks during hot times, camels store fat for energy, and many animals come out at night when cooler. Each detail shows a heat adaptation. Choice A is correct because 'Some lizards hide under rocks during the hottest part of the day' directly supports the main idea about heat adaptation. This detail explains one specific way desert animals cope with heat - by seeking shelter during peak temperatures. It's a clear example of behavioral adaptation to heat. Choice B is incorrect because this is about geography (where deserts are located), not about animal adaptations to heat. This detail doesn't support the main idea at all - it's about desert locations, not how animals survive heat. To help students: First identify the main idea (desert animals adapt to heat), then look for details that show HOW animals adapt. Use the test question 'Does this detail show an adaptation to heat?' Choice A - yes (hiding from heat); Choice B - no (about continents); Choice C - no (about forest foxes); Choice D - no (about rocks). Create a two-column chart: 'Heat Adaptations' and 'Not Heat Adaptations' to sort details. Model the connection: 'Hiding under rocks DURING THE HOTTEST PART shows this is about avoiding heat.' Teach students to look for key words that connect to the main idea - here, 'hottest' connects to heat survival. Practice eliminating off-topic details that don't relate to the specific main idea.

Question 5

Read the passage. Many inventions make travel faster and easier. The wheel helped people move heavy loads with less effort. The steam engine powered trains that could travel long distances. Airplanes let people cross oceans in hours instead of weeks. Today, GPS helps drivers find the best routes. What is the main idea of this passage?

  1. Inventions have improved the way people travel.
  2. Trains are the oldest kind of transportation.
  3. GPS only works on sunny days.
  4. People should never travel across oceans.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify what the passage is mostly about and understand how details support that central message. The main idea should encompass the common theme connecting all the examples. In this passage, the main idea is that inventions have improved the way people travel. The passage provides several key details: the wheel helped move heavy loads easier, steam engines powered long-distance trains, airplanes cross oceans quickly, and GPS helps find best routes. Each detail shows how an invention improved transportation. Choice A is correct because 'Inventions have improved the way people travel' captures what the whole passage is about. Each detail in the passage - wheel making movement easier, trains going long distances, planes saving time, GPS finding routes - supports this central message about inventions improving travel. This answer encompasses all the examples while stating the common theme. Choice B is incorrect because the passage doesn't claim trains are the oldest transportation. The passage mentions the wheel before trains, suggesting wheels came first. This introduces a claim about age/order that isn't supported by the text. To help students: Use a timeline graphic organizer to show how each invention improved upon previous travel methods. Teach students to find the common thread - ask 'What do all these inventions do?' (They all make travel better/easier/faster). Practice identifying main ideas that show relationships or themes rather than just listing topics. Model think-aloud: 'Wheel - helps travel; train - helps travel; airplane - helps travel; GPS - helps travel. The pattern is that inventions improve travel.' Eliminate answers with false information (trains oldest) or unsupported claims (never travel oceans, GPS only on sunny days). Help students see that the main idea often states a relationship (inventions → improved travel) rather than just a topic.

Question 6

Read the passage. In the fall, many trees lose their leaves. As days get shorter, trees get less sunlight. The tree stops making as much green color, so other colors show. Cooler weather also helps the leaves change to red, yellow, and orange. Finally, the leaves drop to save water during winter. What is the main idea of this passage?

  1. Leaves change and fall because seasons change.
  2. Winter is the best season for playing outside.
  3. Red leaves are the rarest kind of leaf.
  4. Trees grow faster when days are shorter.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify what the passage is mostly about - the central message that all details support. The main idea should capture the cause-and-effect relationship explained in the passage. In this passage, the main idea is that leaves change and fall because seasons change. The passage provides several key details: days get shorter reducing sunlight, trees stop making green color so other colors show, cooler weather helps leaves change colors, and leaves drop to save water in winter. Each detail explains why autumn leaf changes happen. Choice A is correct because 'Leaves change and fall because seasons change' captures what the whole passage is about. Each detail in the passage - shorter days, less sunlight, cooler weather, water conservation - supports this central message about seasonal changes causing leaf changes. This answer shows the cause (seasons changing) and effect (leaves changing and falling) relationship. Choice B is incorrect because this is an opinion about winter being best for playing, which is not stated or supported by the passage. The passage is about leaf changes in fall, not about which season is best for activities. To help students: Teach students to identify cause-and-effect main ideas by looking for 'because' or 'why' relationships. Use a cause-and-effect graphic organizer: Cause (seasonal changes) → Effects (shorter days, less sunlight, cooler weather) → Result (leaves change and fall). Practice distinguishing facts from opinions - the passage presents facts about leaf changes, not opinions about seasons. Model the thinking: 'All the details explain WHY leaves change. What's the big reason? The season is changing.' Help students see that Choice C (rarest leaves) and Choice D (faster growth) introduce false information not in the passage. Teach students to look for main ideas that encompass the overall explanation, not just one detail.

Question 7

Read the passage. Bees are important helpers for many plants. When bees visit flowers, they carry pollen from one flower to another. This helps plants grow fruits like apples and berries. Bees also help farmers because many crops need pollination. Without bees, there would be fewer flowers and less food. What is the main idea of this passage?

  1. Bees only like visiting bright flowers.
  2. Bees help plants and people by pollinating.
  3. Flowers are the prettiest plants in spring.
  4. Apples and berries grow best in hot weather.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify what the passage is mostly about and understand how details support that central message. The main idea is what the passage is mostly about - the central message or big idea. It's different from the topic (topic = what passage is about, like 'bees'; main idea = the point being made, like 'bees are helpful'). The main idea should be supported by most or all of the details in the passage. In this passage, the main idea is that bees help plants and people by pollinating. The passage provides several key details: bees carry pollen between flowers, this helps plants grow fruits, bees help farmers with crops, and without bees there would be less food. Each of these details shows how bees are helpful through pollination. Choice B is correct because it captures what the whole passage is about. Each detail in the passage - carrying pollen, helping grow fruits, helping farmers, preventing food shortage - supports this central message about bees being helpful through pollination. This is not too broad (it's more specific than just 'bees') and not too narrow (it covers all the details, not just one aspect). Choice A is incorrect because this is a supporting detail, not the main idea. While the passage does mention bees visiting flowers, that's just one fact supporting the bigger idea that bees help through pollination. To help students: Teach the difference between topic (one word or phrase - bees) and main idea (complete thought - bees help plants and people). Use 'umbrella' analogy: main idea is the umbrella that covers all the details underneath. Practice finding main idea by asking 'What is this mostly about?' and checking if most details support that idea. Use graphic organizers: main idea in center, supporting details around it with arrows showing connections. Model think-aloud: 'Detail 1 says bees carry pollen, detail 2 says this helps grow fruit, detail 3 says farmers need this - what do all these have in common? They all show that bees help through pollination.'

Question 8

Read the passage. Rainforests are home to many living things. Tall trees form a canopy that blocks some sunlight. Vines and plants grow up the trunks to reach light. Many animals, like monkeys and birds, live high in the trees. The warm, wet weather helps plants grow all year. Which detail does NOT support the main idea that rainforests have many living things?

  1. Many animals live high in the trees.
  2. Vines and plants grow up tree trunks.
  3. The warm, wet weather helps plants grow.
  4. Some deserts get very little rain each year.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify what the passage is mostly about and understand how details support that central message. This question asks students to identify which detail does NOT support the main idea - a reverse application of the skill. Students must first identify the main idea, then determine which detail doesn't fit. In this passage, the main idea is that rainforests are home to many living things. The passage provides several supporting details: tall trees form a canopy, vines and plants grow up trunks, many animals like monkeys and birds live in trees, and warm wet weather helps plants grow year-round. Each of these details shows the abundance of life in rainforests. Choice D is correct because 'Some deserts get very little rain each year' does NOT support the main idea about rainforests having many living things. This detail is about deserts, not rainforests, and doesn't relate to or support information about life in rainforests. It's completely off-topic from the passage's focus. Choices A, B, and C are all incorrect for this question because they DO support the main idea - animals in trees, vines growing on trunks, and favorable weather for plant growth all demonstrate the abundance of life in rainforests. To help students: Teach this question type explicitly - 'Which does NOT support' requires different thinking. First have students identify the main idea, then check each detail against it. Use a checklist strategy: Does this detail talk about rainforests? Does it show there's lots of life? If no to either, it doesn't support the main idea. Model the process: 'The main idea is about life in rainforests. Choice A - animals in trees - that's life in rainforests, so it DOES support. Choice D - deserts and rain - that's not even about rainforests!' Use graphic organizers with a 'doesn't belong' section. Practice with sorting activities where students separate supporting details from non-supporting ones.

Question 9

Read the passage. Saving water at home can help the environment. Turning off the tap while brushing your teeth saves gallons of water. Taking shorter showers also uses less water. Fixing a dripping faucet can stop wasted water every day. Using a broom instead of a hose to clean a sidewalk saves water too. What are the key details in this passage?

  1. Turn off the tap, take shorter showers, fix drips, use a broom.
  2. Water is blue, cold, and found in oceans.
  3. Brush your teeth, eat breakfast, and walk to school.
  4. Buy new faucets, paint the sidewalk, and water plants daily.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify all the key supporting details from the passage. Key details are the specific facts that support the main idea, while minor details are less important information. In this passage, the main idea is that saving water at home helps the environment. The passage provides several key details that show specific ways to save water: turning off tap while brushing teeth, taking shorter showers, fixing dripping faucets, and using a broom instead of hose for cleaning. Each detail provides a concrete water-saving action. Choice A is correct because it lists all four key water-saving methods mentioned in the passage: 'Turn off the tap, take shorter showers, fix drips, use a broom.' These are the specific supporting details that show HOW to save water at home. Each one is a concrete action from the passage that supports the main idea. Choice C is incorrect because these are general daily activities (brush teeth, eat breakfast, walk to school) that aren't about saving water. While brushing teeth is mentioned in the passage, it's specifically about turning off the tap during brushing, not just brushing teeth in general. To help students: Teach the difference between key details (directly support main idea) and unrelated information. Use highlighting: have students highlight each water-saving tip in the passage, then find the answer that matches. Practice listing details in their own words, then matching to answer choices. Create a checklist: ✓ Turn off tap, ✓ Shorter showers, ✓ Fix drips, ✓ Use broom - only Choice A has all four. Model eliminating wrong answers: Choice B describes water properties (not saving methods), Choice C lists daily routines (not water-saving), Choice D mixes one good idea with wrong ones. Teach students that when asked for 'key details,' they need ALL the main supporting facts, not just some.

Question 10

Read the passage.

Rainforests are important to Earth. They make oxygen that people and animals need to breathe. Many kinds of plants and animals live there, including insects, birds, and monkeys. Rainforests also help control the weather by soaking up lots of rain. People use rainforest plants to make some medicines.

What is the main idea of this passage?

  1. Rainforests get a lot of rain each year.
  2. Rainforests are important to Earth.
  3. Animals like monkeys live in rainforests.
  4. Forests are places with many trees.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify what the passage is mostly about and understand how details support that central message. The main idea is what the passage is mostly about - the central message or big idea. It's different from the topic (topic = what passage is about, like 'bats'; main idea = the point being made, like 'bats are helpful to the environment'). The main idea should be supported by most or all of the details in the passage. Supporting details are specific facts, examples, or evidence that support the main idea. Each key detail should relate to and help explain the main idea. Good readers identify the main idea by asking 'What is this passage mostly trying to tell me?' and then identify which details support that message. In this passage, the main idea is that rainforests are important to Earth. This is the central message that the whole passage supports. The passage provides several key details: they make oxygen for breathing, house many plants and animals, help control weather by soaking up rain, and provide plants for medicines. Each of these details shows how rainforests benefit the planet and living things. Choice B is correct because this captures what the whole passage is about. Each detail in the passage - making oxygen, housing animals, controlling weather, providing medicines - supports this central message. This is not too broad (it's more specific than just 'rainforests') and not too narrow (it covers all the details, not just one like animal habitats). Choice A is incorrect because this is a supporting detail, not the main idea. While the passage does mention soaking up rain, that's just one fact supporting the bigger idea that rainforests are important to Earth. To help students: Teach the difference between topic (one word or phrase - bats, recycling) and main idea (complete thought - bats help the environment, recycling protects our planet). Use 'umbrella' analogy: main idea is the umbrella that covers all the details underneath. Practice finding main idea by asking 'What is this mostly about?' and checking if most details support that idea. Teach students to eliminate answers that are: too broad (just topic), too narrow (only one detail), or not supported by passage. Use graphic organizers: main idea in center, supporting details around it with arrows showing how each supports. Practice identifying where main idea appears: sometimes first sentence (topic sentence), sometimes last sentence (conclusion), sometimes middle, sometimes implied (reader must infer from details). Model think-aloud: 'Detail 1 says [X], detail 2 says [Y], detail 3 says [Z] - what do all these have in common? They all show that [main idea].' Teach students to ask: Would removing this detail change the main idea? (Key details: yes; minor details: no). Use color coding: highlight main idea in one color, supporting details in another. Practice with short passages, gradually increasing length. Watch for: Students who confuse topic with main idea, choose interesting details instead of main idea, select first or last sentence without checking if it's actually the main idea, or can't distinguish key details from minor facts. Provide explicit instruction in identifying central message and explaining how details support it.

Question 11

Read the passage.

A seed can grow into a plant if it gets what it needs. First, it needs water to start sprouting. Next, it needs sunlight to make food in its leaves. A seed also needs air and good soil so the roots can grow. With time and care, the plant can grow taller and make flowers.

The author's main point is that:

  1. Plants grow best only in sand.
  2. Seeds need several things to grow into plants.
  3. Flowers are the first part of a plant to grow.
  4. Sunlight is not important for plants.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify what the passage is mostly about and understand how details support that central message. The main idea is what the passage is mostly about - the central message or big idea. It's different from the topic (topic = what passage is about, like 'bats'; main idea = the point being made, like 'bats are helpful to the environment'). The main idea should be supported by most or all of the details in the passage. Supporting details are specific facts, examples, or evidence that support the main idea. Each key detail should relate to and help explain the main idea. Good readers identify the main idea by asking 'What is this passage mostly trying to tell me?' and then identify which details support that message. In this passage, the main idea is that a seed can grow into a plant if it gets what it needs. This is the central message that the whole passage supports. The passage provides several key details: seeds need water to sprout, sunlight to make food, air and good soil for roots, and with time and care they grow taller and make flowers. Each of these details explains why certain elements are essential for growth. Choice B is correct because this captures what the whole passage is about. Each detail in the passage - water, sunlight, air, soil, time - supports this central message. This is not too broad (it's more specific than just 'plants') and not too narrow (it covers all the details, not just one need). Choice A is incorrect because this information is not stated or supported by the passage. To help students: Teach the difference between topic (one word or phrase - bats, recycling) and main idea (complete thought - bats help the environment, recycling protects our planet). Use 'umbrella' analogy: main idea is the umbrella that covers all the details underneath. Practice finding main idea by asking 'What is this mostly about?' and checking if most details support that idea. Teach students to eliminate answers that are: too broad (just topic), too narrow (only one detail), or not supported by passage. Use graphic organizers: main idea in center, supporting details around it with arrows showing how each supports. Practice identifying where main idea appears: sometimes first sentence (topic sentence), sometimes last sentence (conclusion), sometimes middle, sometimes implied (reader must infer from details). Model think-aloud: 'Detail 1 says [X], detail 2 says [Y], detail 3 says [Z] - what do all these have in common? They all show that [main idea].' Teach students to ask: Would removing this detail change the main idea? (Key details: yes; minor details: no). Use color coding: highlight main idea in one color, supporting details in another. Practice with short passages, gradually increasing length. Watch for: Students who confuse topic with main idea, choose interesting details instead of main idea, select first or last sentence without checking if it's actually the main idea, or can't distinguish key details from minor facts. Provide explicit instruction in identifying central message and explaining how details support it.

Question 12

Read the passage. Recycling helps protect our environment. Recycling paper can save trees because fewer new trees need to be cut down. Recycling aluminum cans saves energy at factories. Recycling plastic can reduce the amount of trash in landfills. When people recycle, they also help cut down on pollution. What is the main idea of this passage?

  1. Recycling helps protect the environment in several ways.
  2. Aluminum cans are made in factories.
  3. Trash always belongs in landfills.
  4. Trees are the tallest plants on Earth.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify what the passage is mostly about and understand how details support that central message. The main idea is what the passage is mostly about - the central message or big idea. It's different from the topic (topic = what passage is about, like 'recycling'; main idea = the point being made, like 'recycling helps protect the environment in several ways'). The main idea should be supported by most or all of the details in the passage. Supporting details are specific facts, examples, or evidence that support the main idea. Each key detail should relate to and help explain the main idea. Good readers identify the main idea by asking 'What is this passage mostly trying to tell me?' and then identify which details support that message. In this passage, the main idea is that recycling helps protect our environment (or recycling helps protect the environment in several ways). This is the central message that the whole passage supports. The passage provides several key details: recycling paper saves trees, recycling aluminum saves energy, recycling plastic reduces landfill trash, and recycling cuts down on pollution. Each of these details shows a different way that recycling helps the environment. Choice A is correct because it captures what the whole passage is about. Each detail in the passage - saving trees, saving energy, reducing trash, and cutting pollution - supports this central message about recycling protecting the environment. This answer includes 'in several ways,' which perfectly matches how the passage provides multiple examples of environmental benefits. Choice B is incorrect because this is not stated or supported by the passage. The passage mentions recycling aluminum cans saves energy at factories, but doesn't discuss how aluminum cans are made. To help students: Teach the difference between topic (one word or phrase - recycling, environment) and main idea (complete thought - recycling protects our planet, recycling helps the environment in many ways). Use 'umbrella' analogy: main idea is the umbrella that covers all the details underneath. Practice finding main idea by asking 'What is this mostly about?' and checking if most details support that idea. Teach students to eliminate answers that are: too broad (just topic), too narrow (only one detail), or not supported by passage. Use graphic organizers: main idea in center, supporting details around it with arrows showing how each supports. Practice identifying where main idea appears: sometimes first sentence (topic sentence), sometimes last sentence (conclusion), sometimes middle, sometimes implied (reader must infer from details). Model think-aloud: 'Detail 1 says recycling saves trees, detail 2 says it saves energy, detail 3 says it reduces trash - what do all these have in common? They all show that recycling helps protect the environment.' Teach students to ask: Would removing this detail change the main idea? (Key details: yes; minor details: no). Use color coding: highlight main idea in one color, supporting details in another. Watch for: Students who confuse topic with main idea, choose interesting but unrelated details, or select answers not supported by the text.

Question 13

Read the passage. Some animals use camouflage to stay safe. A walking stick insect looks like a thin twig on a branch. A snowshoe hare has white fur in winter to blend into snow. Many fish have dark backs so they are hard to see from above. These tricks help animals hide from predators. Which detail does NOT support the main idea?

  1. A walking stick insect looks like a thin twig.
  2. Many fish have dark backs to be hard to see.
  3. A snowshoe hare has white fur in winter.
  4. Some animals sleep during the day and hunt at night.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify what the passage is mostly about and understand how details support that central message. The main idea is what the passage is mostly about - the central message or big idea. It's different from the topic (topic = what passage is about, like 'animals'; main idea = the point being made, like 'some animals use camouflage to stay safe'). The main idea should be supported by most or all of the details in the passage. Supporting details are specific facts, examples, or evidence that support the main idea. Each key detail should relate to and help explain the main idea. Good readers identify the main idea by asking 'What is this passage mostly trying to tell me?' and then identify which details support that message. In this passage, the main idea is that some animals use camouflage to stay safe. This is the central message that the whole passage supports. The passage provides several key details: walking stick insects look like twigs, snowshoe hares have white fur in winter, fish have dark backs to blend in. Each of these details gives examples of how animals use camouflage for protection. Choice D is correct because 'Some animals sleep during the day and hunt at night' does NOT support the main idea. This detail is about nocturnal behavior, not camouflage. While it might be another way animals stay safe, it doesn't relate to blending in or hiding through appearance, which is what camouflage means. All the other choices describe specific camouflage adaptations. Choice A is incorrect as an answer because it DOES support the main idea - walking stick insects looking like twigs is a perfect example of camouflage that helps them hide from predators. To help students: Teach the difference between topic (one word or phrase - bees, recycling) and main idea (complete thought - bees help the environment, recycling protects our planet). Use 'umbrella' analogy: main idea is the umbrella that covers all the details underneath. Practice finding main idea by asking 'What is this mostly about?' and checking if most details support that idea. Teach students to eliminate answers that are: too broad (just topic), too narrow (only one detail), or not supported by passage. Use graphic organizers: main idea in center, supporting details around it with arrows showing how each supports. Practice identifying where main idea appears: sometimes first sentence (topic sentence), sometimes last sentence (conclusion), sometimes middle, sometimes implied (reader must infer from details). Model think-aloud: 'The main idea is about camouflage for safety. Choice A - looking like a twig is camouflage. Choice B - dark backs for blending is camouflage. Choice C - white fur to blend with snow is camouflage. Choice D - sleeping and hunting times is NOT about blending in or appearance.'

Question 14

Read the passage. Recycling helps protect our environment. When we recycle paper, fewer trees need to be cut down. Recycling aluminum cans saves energy at factories. Recycling plastic uses less oil and makes less trash in landfills. These actions can also reduce pollution in the air and water. What is the main idea of this passage?​

  1. Paper is made from trees.
  2. Recycling helps protect the environment.
  3. Aluminum cans are shiny.
  4. Landfills are always full.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify what the passage is mostly about and understand how details support that central message. The main idea is what the passage is mostly about - the central message or big idea. It's different from the topic (topic = what passage is about, like 'bats'; main idea = the point being made, like 'bats are helpful to the environment'). The main idea should be supported by most or all of the details in the passage. Supporting details are specific facts, examples, or evidence that support the main idea. Each key detail should relate to and help explain the main idea. Good readers identify the main idea by asking 'What is this passage mostly trying to tell me?' and then identify which details support that message. In this passage, the main idea is that recycling helps protect the environment. This is the central message that the whole passage supports. The passage provides several key details: recycling paper saves trees, recycling aluminum saves energy, recycling plastic uses less oil and reduces trash in landfills, and these actions reduce pollution. Each of these details gives examples of how recycling benefits the environment. Choice B is correct because this captures what the whole passage is about. Each detail in the passage - saving trees, energy, oil, reducing trash and pollution - supports this central message. This is not too broad (it's more specific than just 'recycling') and not too narrow (it covers all the details, not just one like saving trees). Choice A is incorrect because this is a supporting detail, not the main idea. While the passage does mention paper is made from trees, that's just one fact supporting the bigger idea that recycling helps protect the environment. To help students: Teach the difference between topic (one word or phrase - bats, recycling) and main idea (complete thought - bats help the environment, recycling protects our planet). Use 'umbrella' analogy: main idea is the umbrella that covers all the details underneath. Practice finding main idea by asking 'What is this mostly about?' and checking if most details support that idea. Teach students to eliminate answers that are: too broad (just topic), too narrow (only one detail), or not supported by passage. Use graphic organizers: main idea in center, supporting details around it with arrows showing how each supports. Practice identifying where main idea appears: sometimes first sentence (topic sentence), sometimes last sentence (conclusion), sometimes middle, sometimes implied (reader must infer from details). Model think-aloud: 'Detail 1 says [X], detail 2 says [Y], detail 3 says [Z] - what do all these have in common? They all show that [main idea].' Teach students to ask: Would removing this detail change the main idea? (Key details: yes; minor details: no). Use color coding: highlight main idea in one color, supporting details in another. Practice with short passages, gradually increasing length. Watch for: Students who confuse topic with main idea, choose interesting details instead of main idea, select first or last sentence without checking if it's actually the main idea, or can't distinguish key details from minor facts. Provide explicit instruction in identifying central message and explaining how details support it.

Question 15

Read the passage. Many kids feel nervous before a test. One solution is to study a little each day instead of all at once. Getting enough sleep helps your brain remember what you learned. Eating a healthy breakfast can give you energy to focus. Taking slow breaths can also calm your body. What is the main idea of this passage?​

  1. Tests should be longer for all students.
  2. There are helpful ways to handle test nerves.
  3. Breakfast is the most important meal.
  4. Studying should only happen at school.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify what the passage is mostly about and understand how details support that central message. The main idea is what the passage is mostly about - the central message or big idea. It's different from the topic (topic = what passage is about, like 'test anxiety'; main idea = the point being made, like 'there are helpful ways to handle test nerves'). The main idea should be supported by most or all of the details in the passage. Supporting details are specific facts, examples, or evidence that support the main idea. Each key detail should relate to and help explain the main idea. Good readers identify the main idea by asking 'What is this passage mostly trying to tell me?' and then identify which details support that message. In this passage, the main idea is that there are helpful ways to handle test nerves. This is the central message that the whole passage supports. The passage provides several key details: study a little each day, get enough sleep, eat a healthy breakfast, and take slow breaths. Each of these details provides a solution or strategy for dealing with test anxiety. Choice B is correct because it captures what the whole passage is about. Each detail in the passage - studying gradually, sleeping well, eating breakfast, and breathing slowly - supports this central message about ways to handle test nervousness. This is not too broad (it's more specific than just 'tests') and not too narrow (it covers all the strategies, not just one). Choice C is incorrect because this is too narrow - it only covers one detail mentioned in the passage. While the passage does mention eating a healthy breakfast, that's just one of several strategies for handling test nerves, not the main idea of the entire passage. To help students: Teach the difference between topic (one word or phrase - tests, nervousness) and main idea (complete thought - there are ways to reduce test anxiety, students can manage test nerves effectively). Use 'umbrella' analogy: main idea is the umbrella that covers all the details underneath. Practice finding main idea by asking 'What is this mostly about?' and checking if most details support that idea. Teach students to eliminate answers that are: too broad (just topic), too narrow (only one detail), or not supported by passage. Use graphic organizers: main idea in center, supporting details around it with arrows showing how each supports. Practice identifying where main idea appears: sometimes first sentence (topic sentence), sometimes last sentence (conclusion), sometimes middle, sometimes implied (reader must infer from details). Model think-aloud: 'The passage gives four strategies - studying daily, sleeping, eating breakfast, breathing - what do all these have in common? They all are ways to handle test nerves.' Teach students to ask: Does this answer cover all the important information in the passage? Watch for: Students who choose one interesting detail instead of the main idea, select answers that are too general or too specific, or miss the problem-solution structure of the passage.

Question 16

Read the passage. Bees help many plants grow. When bees visit flowers, they move pollen from one flower to another. This helps plants make seeds and fruit, like apples and berries. Bees also help farmers because more crops can grow. People can plant flowers and avoid spraying harmful chemicals to help bees. What is the main idea of this passage?​

  1. Bees visit flowers to find nectar.
  2. Bees help plants and people in important ways.
  3. Plants are important for animals.
  4. Farmers only grow apples and berries.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify what the passage is mostly about and understand how details support that central message. The main idea is what the passage is mostly about - the central message or big idea. It's different from the topic (topic = what passage is about, like 'bees'; main idea = the point being made, like 'bees help plants and people in important ways'). The main idea should be supported by most or all of the details in the passage. Supporting details are specific facts, examples, or evidence that support the main idea. Each key detail should relate to and help explain the main idea. Good readers identify the main idea by asking 'What is this passage mostly trying to tell me?' and then identify which details support that message. In this passage, the main idea is that bees help plants and people in important ways. This is the central message that the whole passage supports. The passage provides several key details: bees move pollen between flowers, this helps plants make seeds and fruit, bees help farmers grow more crops, and people can help bees by planting flowers and avoiding harmful chemicals. Each of these details shows how bees are helpful to both plants and people. Choice B is correct because it captures what the whole passage is about. Each detail in the passage - pollination, fruit production, helping farmers, and how we can help bees - supports this central message. This is not too broad (it's more specific than just 'bees') and not too narrow (it covers all the details, not just pollination). Choice A is incorrect because this is a supporting detail, not the main idea. While the passage does mention that bees visit flowers for nectar, that's just one fact supporting the bigger idea that bees help plants and people. To help students: Teach the difference between topic (one word or phrase - bees, recycling) and main idea (complete thought - bees help the environment, recycling protects our planet). Use 'umbrella' analogy: main idea is the umbrella that covers all the details underneath. Practice finding main idea by asking 'What is this mostly about?' and checking if most details support that idea. Teach students to eliminate answers that are: too broad (just topic), too narrow (only one detail), or not supported by passage. Use graphic organizers: main idea in center, supporting details around it with arrows showing how each supports. Practice identifying where main idea appears: sometimes first sentence (topic sentence), sometimes last sentence (conclusion), sometimes middle, sometimes implied (reader must infer from details). Model think-aloud: 'Detail 1 says bees move pollen, detail 2 says this helps make fruit, detail 3 says farmers benefit - what do all these have in common? They all show that bees help plants and people.' Teach students to ask: Would removing this detail change the main idea? (Key details: yes; minor details: no). Use color coding: highlight main idea in one color, supporting details in another.

Question 17

Read the passage. Maps use symbols to show places. A blue line might stand for a river. A small airplane symbol can mark an airport. Most maps have a key that explains what the symbols mean. Maps also have a compass rose to show directions. Which sentence states the main idea?

  1. Maps use symbols to show places.
  2. A blue line might stand for a river.
  3. Most maps have a key that explains symbols.
  4. Maps also have a compass rose to show directions.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify what the passage is mostly about and understand how details support that central message. The main idea is often stated directly in one sentence, while other sentences provide supporting details. Students need to distinguish between the main idea statement and the supporting examples. In this passage, the main idea is that maps use symbols to show places. The passage provides several supporting details: blue lines can represent rivers (example), airplane symbols mark airports (example), maps have keys explaining symbols (supporting fact), and maps have compass roses for directions (additional feature). The first sentence states the main idea, and the rest provide examples and details. Choice A is correct because 'Maps use symbols to show places' is the main idea sentence that the whole passage supports. This is the central message - all other sentences provide examples (blue lines for rivers, airplane for airport) or related information (keys, compass roses) that support this main concept about maps using symbols. Choices B and C are incorrect because these are supporting details, not the main idea. 'A blue line might stand for a river' is an example of how maps use symbols, and 'Most maps have a key' explains how to understand symbols - both support the bigger idea. Choice D about compass roses is an additional detail about maps but doesn't capture the main focus on symbols. To help students: Teach students to identify main idea sentences, which often appear at the beginning of passages. Practice distinguishing between the main idea (general statement) and supporting details (specific examples). Use the 'topic sentence' concept - the sentence that tells what the whole paragraph is about. Model: 'Which sentence could stand alone and still tell us what this passage is about?' Use graphic organizers showing the main idea at the top with supporting details below. Teach students that examples (blue line = river) support broader statements (maps use symbols).

Question 18

Read the passage. Some animals use camouflage to stay safe. A stick insect looks like a thin twig on a branch. A snowshoe hare turns white in winter to blend with snow. Many fish have dark backs and light bellies, so they are hard to see in water. Camouflage can help animals hide from predators. What is the main idea of this passage?​

  1. Animals live in many different places.
  2. Stick insects only live in trees.
  3. Camouflage helps animals hide and stay safe.
  4. Fish are the best swimmers in water.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify what the passage is mostly about and understand how details support that central message. The main idea is what the passage is mostly about - the central message or big idea. It's different from the topic (topic = what passage is about, like 'camouflage'; main idea = the point being made, like 'camouflage helps animals hide and stay safe'). The main idea should be supported by most or all of the details in the passage. Supporting details are specific facts, examples, or evidence that support the main idea. Each key detail should relate to and help explain the main idea. Good readers identify the main idea by asking 'What is this passage mostly trying to tell me?' and then identify which details support that message. In this passage, the main idea is that camouflage helps animals hide and stay safe. This is the central message that the whole passage supports. The passage provides several key details: stick insects look like twigs, snowshoe hares turn white in winter, fish have dark backs and light bellies, and camouflage helps animals hide from predators. Each of these details gives examples of how camouflage helps animals stay safe. Choice C is correct because it captures what the whole passage is about. Each detail in the passage - the stick insect example, the snowshoe hare example, and the fish example - supports this central message about camouflage helping animals hide and stay safe. This is not too broad (it's more specific than just 'animals') and not too narrow (it covers all the examples, not just one animal). Choice A is incorrect because this is too general - it's just a broad statement about animals living in different places. The passage makes a specific point about camouflage, not just where animals live. To help students: Teach the difference between topic (one word or phrase - animals, camouflage) and main idea (complete thought - camouflage helps animals survive, animals use camouflage for protection). Use 'umbrella' analogy: main idea is the umbrella that covers all the details underneath. Practice finding main idea by asking 'What is this mostly about?' and checking if most details support that idea. Teach students to eliminate answers that are: too broad (just topic), too narrow (only one detail), or not supported by passage. Use graphic organizers: main idea in center, supporting details around it with arrows showing how each supports. Practice identifying where main idea appears: sometimes first sentence (topic sentence), sometimes last sentence (conclusion), sometimes middle, sometimes implied (reader must infer from details). Model think-aloud: 'Detail 1 says stick insects look like twigs, detail 2 says hares turn white, detail 3 says fish have special coloring - what do all these have in common? They all show that camouflage helps animals hide and stay safe.' Teach students to ask: Would removing this detail change the main idea? (Key details: yes; minor details: no). Use color coding: highlight main idea in one color, supporting details in another. Watch for: Students who confuse topic with main idea, choose interesting details instead of main idea, or select answers that are too broad or too narrow.

Question 19

Read the passage. Plants need several things to grow well. They need sunlight to make food in their leaves. They also need water to stay healthy and move nutrients. Most plants grow best in soil that has nutrients. Plants need air too, because they use a gas called carbon dioxide. The author's main point is that:​

  1. Plants need sunlight, water, soil, and air to grow.
  2. Soil is the only thing plants need.
  3. Plants are the same as animals.
  4. Carbon dioxide is dangerous for all living things.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify what the passage is mostly about and understand how details support that central message. The main idea is what the passage is mostly about - the central message or big idea. It's different from the topic (topic = what passage is about, like 'plants'; main idea = the point being made, like 'plants need several things to grow well'). The main idea should be supported by most or all of the details in the passage. Supporting details are specific facts, examples, or evidence that support the main idea. Each key detail should relate to and help explain the main idea. Good readers identify the main idea by asking 'What is this passage mostly trying to tell me?' and then identify which details support that message. In this passage, the main idea is that plants need several things to grow well. This is the central message that the whole passage supports. The passage provides several key details: plants need sunlight to make food, water to stay healthy and move nutrients, soil with nutrients, and air for carbon dioxide. Each of these details explains a different requirement for plant growth. Choice A is correct because it captures what the whole passage is about. Each detail in the passage - sunlight for making food, water for health and nutrients, soil for nutrients, and air for carbon dioxide - supports this central message that plants need multiple things to grow. This answer correctly identifies all four requirements mentioned: sunlight, water, soil, and air. Choice B is incorrect because this contradicts the passage. The passage clearly states that plants need several things (sunlight, water, soil, and air), not just soil alone. This answer represents a common misconception that plants only need soil. To help students: Teach the difference between topic (one word or phrase - plants, growth) and main idea (complete thought - plants need several things to grow, plants have multiple requirements for growth). Use 'umbrella' analogy: main idea is the umbrella that covers all the details underneath. Practice finding main idea by asking 'What is this mostly about?' and checking if most details support that idea. Teach students to eliminate answers that are: too broad (just topic), too narrow (only one detail), or not supported by passage. Use graphic organizers: main idea in center, supporting details around it with arrows showing how each supports. Practice identifying where main idea appears: sometimes first sentence (topic sentence), sometimes last sentence (conclusion), sometimes middle, sometimes implied (reader must infer from details). Model think-aloud: 'The passage lists sunlight, water, soil, and air - what do all these have in common? They all are things plants need to grow well.' Teach students to watch for absolute words like 'only' that often make statements incorrect. Use lists or charts to track multiple requirements or examples. Watch for: Students who choose overly simple answers, miss the word 'several' indicating multiple needs, or select answers that contradict the passage. Provide explicit instruction in recognizing when passages present multiple related points under one main idea.

Question 20

Read the passage. The Moon seems to change shape during the month. This happens because the Moon orbits Earth. As it moves, we see different amounts of the sunlit side. A full moon happens when the whole sunlit side faces Earth. A new moon happens when the sunlit side faces away from Earth. This passage is mostly about:

  1. Why the Moon has phases.
  2. How to build a telescope at home.
  3. Why the Sun is smaller than the Moon.
  4. How clouds make the Moon disappear forever.
Explanation: This question tests determining the main idea and supporting details (CCSS.RI.3.2: Determine the main idea of a text; recount the key details and explain how they support the main idea). Students must identify what the passage is mostly about and understand how details support that central message. The main idea should capture the phenomenon being explained - here, why we see different moon shapes. In this passage, the main idea is why the Moon has phases. The passage provides several key details: the Moon orbits Earth, as it moves we see different amounts of the sunlit side, full moon occurs when sunlit side faces Earth, and new moon occurs when sunlit side faces away. Each detail explains the mechanism behind moon phases. Choice A is correct because 'Why the Moon has phases' captures what the whole passage is about. Each detail in the passage - Moon orbiting Earth, seeing different amounts of sunlit side, full moon and new moon positions - supports this central message explaining the cause of moon phases. This answer addresses the 'why' that the passage explains. Choice C is incorrect because the passage never says the Sun is smaller than the Moon. In fact, the passage doesn't compare their sizes at all - it only discusses how we see different amounts of the Moon's sunlit side, not anything about actual sizes. To help students: Focus on identifying what question the passage answers - here it answers 'Why does the Moon seem to change shape?' Use diagrams to show Moon phases and how Earth's position affects what we see. Teach students to eliminate factually wrong answers (Sun smaller than Moon) and off-topic answers (building telescopes, clouds making Moon disappear). Model the thinking: 'The passage explains something about the Moon. What is it explaining? WHY the Moon looks different throughout the month.' Practice with science texts that explain phenomena, helping students identify the main question being answered. Create a KWL chart focusing on the 'L' (what we Learned) to identify main ideas.