- How does the author develop the central idea in the first three paragraphs?
Answer: By presenting three kinds of benefits, mental, cultural, and practical, each supported with clear, specific examples.
The first three paragraphs each present a different kind of benefit—mental skills like focus and self-control, cultural understanding like noticing other customs, and practical gains like careers and relationships—and each is backed with examples. The answer naming three kinds of benefits with examples matches this structure. The choice claiming the author focuses only on the strain of switching and argues learning is too hard misreads the passage, which treats that effort as a source of benefit, not a reason to quit. The choice about tracing the history of languages is wrong because the passage never discusses when languages appeared or how they spread. The choice describing one worker's daily routine is also wrong: the passage mentions careers and family briefly as examples, but it does not follow a single person through a routine. Only the answer about three types of benefits describes how the author actually organizes these paragraphs.
- Read the passage and answer the question.
(1) Renewable energy represents one of the most practical solutions to reducing greenhouse gas emissions. (2) Unlike fossil fuels, sources such as wind and solar generate electricity without releasing carbon dioxide during operation. (3) As more renewable power replaces coal and oil, the overall emissions from electricity production can drop.
(4) Renewable energy can also strengthen the economy. (5) Building wind farms and installing solar panels creates jobs in construction, maintenance, and engineering. (6) Because sunlight and wind are free, renewables can protect consumers from sudden fuel price spikes that affect gas and coal.
(7) Some people worry that renewables are unreliable, but technology is improving quickly. (8) Better batteries store energy for times when the sun is not shining, and updated power grids can move electricity efficiently from where it is generated to where it is needed. (9) In many regions, renewables are now among the cheapest sources of new electricity.
(10) While no single solution will solve climate change alone, expanding renewable energy can cut emissions, support jobs, and provide dependable power as technology advances.
Question: What is the central idea of the passage?
Answer: Renewable energy can help address climate change by reducing emissions while also offering economic and technological advantages.
The central idea is the passage's overall point, which the first sentence states directly: renewable energy is a practical solution for reducing greenhouse gas emissions. Each paragraph then develops one reason it is practical—cutting emissions, strengthening the economy through jobs and price protection, and overcoming reliability worries through better batteries and grids. The final sentence ties these threads together. The choice about addressing climate change by reducing emissions while offering economic and technological advantages captures all of these supporting ideas, so it is the best answer.
The choice claiming renewables mainly matter for creating jobs picks up only one supporting idea (paragraph two) and treats it as the whole point, so it is too narrow. The choice saying renewables are worth pursuing only if they beat fossil fuels in every region adds a condition the passage never makes and is contradicted by sentence 9, which says renewables are already among the cheapest new sources in many places. The choice claiming batteries are the one technology that ensures the future zooms in on a single detail from paragraph three and ignores emissions and economic benefits, so it also misses the broad central idea.
- What is the central idea of the passage?
Answer: Studying smarter, with strategies like retrieval practice and spacing, beats simply studying longer.
The passage's main point, stated at the start and the end, is that how you study matters more than how long, and it develops this through retrieval practice and spacing. Choice B captures that central idea, so it is correct. Choice A promotes rereading, which the passage warns against, Choice C picks up a single detail about vocabulary, and Choice D reverses the advice to test yourself early, so none states the overall idea.
- Read the passage, then answer the question.
(1) Urban trees are sometimes treated as decoration, but they function more like public infrastructure. (2) A city that invests in trees can reduce heat, manage stormwater, and improve residents' health.
(3) First, trees cool neighborhoods. (4) Their shade lowers surface temperatures on sidewalks and buildings, and their leaves release water vapor that cools the air. (5) On extremely hot days, shaded streets can feel noticeably cooler than nearby areas without trees.
(6) Second, trees help with flooding. (7) When rain falls on leaves and branches, some of it evaporates before reaching the ground. (8) Roots also create spaces in soil that allow water to soak in instead of rushing into storm drains. (9) This can reduce the strain on drainage systems during heavy storms.
(10) Third, trees support health. (11) Studies have linked access to green spaces with lower stress and more physical activity, partly because tree-lined streets are more pleasant for walking. (12) Trees can also improve air quality by trapping some pollutants on their leaves.
(13) These benefits show why planting and caring for trees is not just an environmental choice; it is a practical way to make cities safer and more comfortable.
How does the author develop the central idea over the course of the passage?
Answer: By listing several functions of urban trees—cooling, reducing flooding, and supporting health—and explaining each one with specific supporting details.
The passage opens by stating that urban trees act like public infrastructure, then develops that central idea by naming three separate functions and explaining each. The correct answer captures this structure: it lists cooling, reducing flooding, and supporting health, and notes that each is backed with supporting details—matching the passage's 'First,' 'Second,' 'Third' organization.
The choice about focusing only on cooling neighborhoods describes just one of the three functions; the passage covers all three equally, so this misses how the central idea actually develops. The choice about protecting the fastest-growing species is wrong because the passage never compares tree types or growth rates—it discusses what trees do for a city, not which species to plant. The choice about weighing costs against benefits is also wrong; the passage lists benefits without ever discussing price, expense, or city budgets, so no cost-benefit weighing occurs. Only the answer identifying the list-and-explain structure of multiple functions accurately describes the author's method.
- Which statement best summarizes the passage objectively?
Answer: Plastic harms sea life in three main ways: it traps animals, moves up the food chain, and exposes them to chemicals.
An objective summary reports the passage's main points without adding an opinion. The correct choice names all three harms the passage describes—animals getting trapped, plastic entering the food chain, and chemical exposure—stated neutrally, so it captures the whole passage fairly. The choice urging communities to ban items and clean beaches adds a recommendation the passage never makes, so it is a call to action, not a summary. The choice claiming microplastics are the ocean's only real danger contradicts the passage, which treats large items as harmful too, so it overstates and misreads. The choice about plastic products ending up in landfills drifts to general facts about recycling instead of the passage's focus on ocean harm, so it misses the central idea. Only the first choice summarizes the passage objectively.
- What central idea do these lines support? "Recycling one can saves a little energy. Multiply that by millions of cans, and the savings are huge."
Answer: Small actions can add up to large results.
The lines move from a small saving to a huge total, showing that small actions add up. The claim that one can saves a huge amount misreads the text, which says one can saves only a little.
- What is the author's view? "Some call tiny homes a fad. Yet for many families, living small means lower bills and less debt."
Answer: Despite doubts, small homes can ease money strain.
"Yet" signals the author pushing back on critics: small homes can lower costs. The claim that they suit every family goes too far, since the author limits the benefit to "many families."
- How does the third paragraph (about managing wildfire risk) relate to the central idea of the passage?
Answer: It shifts from explaining causes to describing solutions, showing how understanding the problem leads to prevention.
The first two paragraphs explain what drives wildfires—heat drying out plants and human activity like power lines and built-up brush. The third paragraph turns to what communities can do: firefighter resources, controlled burns, thinning, and defensible space. That move from causes to solutions supports the central idea that understanding the problem helps communities prevent damage, so the choice about shifting from causes to solutions is correct. The choice saying it repeats the causes is wrong because the paragraph introduces prevention, not another list of causes. The choice about firefighter shortages is wrong because the paragraph mentions firefighters as one approach, not a central problem. The choice about blaming homebuilding is wrong because the passage treats human choices as one part of a bigger picture, alongside environmental conditions, and never names a single cause.
- How does the section about transportation and stores relate to the central idea of the passage?
Answer: It gives an example of waste in the middle of the system, supporting the idea that many stages must change.
The central idea is that food waste happens at every stage, so no single fix is enough. The transportation-and-stores section adds a middle-of-the-system example—spoilage from delays or failed refrigeration, tossing food at a "best by" date, and overstocking—that supports the idea that many stages must change. That is why the first choice is correct.
The choice that says spoiled shipments prove farms cause most of the waste misreads the passage, which treats every stage as a contributor rather than blaming one group. The choice that admits it is a middle-of-the-system example but claims home habits matter more adds a ranking the passage never makes; the point is that improvements at each stage add up. The choice that says the passage is mainly about how labels were invented is wrong because labels are just one detail used to explain waste, not the main focus. Only the first choice matches both the section's content and the passage's central idea.
- Which statement best summarizes the passage objectively?
Answer: Cafeteria food waste harms budgets and the environment, and schools can cut it with simple, practical changes.
An objective summary states the passage's main points without adding opinion. The passage says food waste hurts budgets and the environment, and that simple changes—lunch after recess, share tables, and offering side choices—can reduce it. The choice about waste harming budgets and the environment, cut by simple, practical changes, captures the whole passage and is correct. The choice that names scheduling as the single most important strategy is wrong because the passage presents scheduling as just one option among several, never ranking it above the others. The choice that calls share tables the main strategy makes the same mistake, promoting one detail into a claim the passage does not make. The choice about methane is true, but it summarizes only one supporting detail rather than the passage as a whole, so it is too narrow to be the best summary.
- Which statement expresses the central idea rather than a supporting detail?
Answer: Many modern museums are shifting from silent storage into active learning spaces that welcome visitor participation.
The central idea is the big point that every paragraph works to support: museums are changing from quiet storage buildings into active places where communities learn and take part. The correct answer states that broad shift, which is why the whole passage keeps returning to it. The choice about science museums letting people experiment with levers, light, and sound is true, but it is one example of an interactive exhibit, not the main point. The choice about recording oral histories from elders is also true, yet it describes a single way museums partner with communities. The choice about history museums using digital stations to compare primary sources is another single example. Each of these three is a real detail from the passage, but each covers only one paragraph or one activity, so it supports the central idea instead of expressing it.
- Which is the central idea? "Libraries lend tools, host coding clubs and offer free Wi-Fi. Today they are about far more than books."
Answer: Libraries now serve communities in many ways.
The tools, clubs and Wi-Fi are examples supporting one idea: libraries do many jobs. Saying books matter less misreads "far more than books," which adds roles without saying books lost value.
- Read the passage and answer the question.
(1) City leaders often talk about building new parks or stadiums, but some of the biggest challenges are less visible: aging infrastructure. (2) Pipes laid decades ago can crack and leak, wasting treated water and sometimes letting contaminants in. (3) Fixing these systems is expensive, yet delaying repairs can lead to sudden breaks that disrupt entire neighborhoods.
(4) Roads and bridges face similar problems. (5) Heavy traffic and weather wear down pavement, creating potholes and unsafe driving conditions. (6) Bridges require regular inspections and maintenance because small weaknesses can grow into serious hazards.
(7) Public transit is another pressure point. (8) As cities grow, buses and trains may become overcrowded, and old equipment can break down more often. (9) Without reliable transit, more people drive, which increases congestion and air pollution.
(10) These issues are connected: when water systems, roads, and transit are neglected, daily life becomes harder and cities spend more responding to emergencies. (11) Long-term planning and steady investment can prevent small problems from becoming crises.
Question: How does paragraph 7–9 relate to the central idea of the passage?
Answer: It provides another example of an infrastructure challenge—public transit—and explains the consequences of neglecting it.
The central idea is that cities face serious challenges from aging infrastructure that need long-term planning and investment. Paragraphs 7–9 support this by presenting public transit as a third example, after water systems and roads and bridges. They explain how overcrowding and breakdowns happen and how weak transit leads to more driving, congestion, and pollution. That is exactly what the best answer says: another infrastructure challenge plus the consequences of neglecting it.
The choice about families deciding which neighborhood to move into is wrong because these paragraphs never discuss where people choose to live—they stay focused on transit as infrastructure. The choice claiming the passage now argues roads and bridges should always come before water systems is wrong because paragraph 7–9 is about transit and never ranks one system above another. The choice saying the paragraphs only restate the opening claim and add no new example is wrong because transit is clearly a new example, not a repetition of the earlier water and road sections.
- How is the central idea introduced and then elaborated in the passage?
Answer: The author opens by claiming exercise helps the brain, then backs it with research on attention, memory, and long-term brain health.
The passage states its main point right away—exercise helps the brain—and then develops it step by step with research on attention, then memory, then long-term brain health. The correct choice names both that opening claim and the way it is elaborated. The choice saying the author warns exercise tires the brain misreads the passage, which shows exercise helps rather than harms thinking. The choice about comparing and ranking types of exercise is wrong because the passage never rates one activity against another; it only reports general benefits. The choice about explaining how brain scans work and teaching readers to read studies mistakes a single supporting detail for the whole purpose—the passage uses scan results as evidence, not as a how-to lesson. Only one option matches both how the idea is introduced and how it grows across the paragraphs.
- How does the author develop the central idea over the course of the passage?
Answer: By naming several benefits, food access, environment, and community, and then tying them together at the end.
The passage first states its main idea, that community gardens improve city life, then develops it through three distinct benefits, food access, environmental help, and stronger community, and finally uses a closing sentence to pull all three together. The correct choice describes exactly that build-and-combine structure. The choice about repeating one single benefit is wrong because the author introduces three different benefits, not one. The choice claiming the author argues only one benefit truly matters is wrong because the ending treats all three as equally important. The choice saying the benefits are never connected is wrong because the final sentence deliberately links food, environment, and social ties as reasons gardens help cities. Only one answer captures both the listing of several benefits and the way the author ties them together at the end.
