- What is the main idea of this passage?
Answer: Ancient civilizations developed effective urban planning principles that modern cities are trying to implement despite significant contemporary challenges.
When you encounter a main idea question, you need to identify the passage's central focus—the overarching point that ties all the details together, rather than getting distracted by specific supporting information.
This passage presents microplastics as a comprehensive environmental problem. It establishes their widespread presence ("ubiquitous in the environment"), explains their multiple origins (plastic waste breakdown, synthetic fibers, microbeads), discusses health concerns for both humans and marine life, and concludes that current solutions are inadequate. The main idea encompasses all these elements: microplastics are everywhere due to various sources, they pose health risks, and they're challenging to address.
Choice A focuses too narrowly on the research aspect. While the passage mentions ongoing studies, research is just one detail, not the central theme. Choice C emphasizes solutions and technology development, but the passage actually stresses that current approaches are insufficient—this misses the tone of the problem's difficulty. Choice D zeroes in on specific sources (clothing, personal care products) and effects (inflammation, behavioral changes), but these are supporting details about marine life impacts, not the passage's main point.
Choice B correctly captures the passage's full scope: widespread distribution from multiple sources, resulting health concerns, and the difficulty of addressing the problem with existing methods. It synthesizes all the key elements without getting trapped in specific details.
For main idea questions on reading comprehension tests, look for the answer that could serve as an umbrella covering all the passage's major points, not just the most interesting or specific details.
- What is the main point of this passage?
Answer: Hibernation is a physiological process that helps animals survive periods of low food availability.
The correct answer is B because it defines what hibernation is (a physiological process) and explains its purpose (survival when food is scarce), which is the central theme. A describes specific details of hibernation, not its overall purpose. C is a misconception that the first sentence of the passage directly contradicts. D is too broad; the passage focuses only on the single strategy of hibernation.
- What is the main idea of this passage?
Answer: The price of goods is determined by the relationship between their availability and consumer desire.
The correct answer is B because it accurately paraphrases the core concept of supply (availability) and demand (consumer desire) and their effect on price. A describes only one half of the dynamic, making it too specific. C is too broad; the passage focuses on the single principle of supply and demand. D describes a key detail of the process (equilibrium) but is not the overarching main idea.
- What is the main point of the passage?
Answer: Active listening is a focused communication skill that improves understanding and relationships.
The correct answer is D because it defines active listening as a skill and summarizes its key benefits (improving understanding and relationships), which is the central message. A focuses on specific techniques, which are details, not the main idea. B is too general; the passage is about the specific technique of active listening, not all good communication. C is directly contradicted by the first sentence of the passage.
- What is the main idea of this passage?
Answer: Microplastics have spread throughout global environments from multiple sources, creating health concerns that are difficult to address with current solutions.
When you encounter a main idea question, you need to identify the passage's central focus—the overarching point that ties all the details together, rather than getting distracted by specific supporting information.
This passage presents microplastics as a comprehensive environmental problem. It establishes their widespread presence ("ubiquitous in the environment"), explains their multiple origins (plastic waste breakdown, synthetic fibers, microbeads), discusses health concerns for both humans and marine life, and concludes that current solutions are inadequate. The main idea encompasses all these elements: microplastics are everywhere due to various sources, they pose health risks, and they're challenging to address.
Choice A focuses too narrowly on the research aspect. While the passage mentions ongoing studies, research is just one detail, not the central theme. Choice C emphasizes solutions and technology development, but the passage actually stresses that current approaches are insufficient—this misses the tone of the problem's difficulty. Choice D zeroes in on specific sources (clothing, personal care products) and effects (inflammation, behavioral changes), but these are supporting details about marine life impacts, not the passage's main point.
Choice B correctly captures the passage's full scope: widespread distribution from multiple sources, resulting health concerns, and the difficulty of addressing the problem with existing methods. It synthesizes all the key elements without getting trapped in specific details.
For main idea questions on reading comprehension tests, look for the answer that could serve as an umbrella covering all the passage's major points, not just the most interesting or specific details.
- The main idea of this passage is that scientists...
Answer: can observe dark matter's gravitational effects but do not yet know its composition.
The correct answer is A because it captures the central puzzle described in the passage: there is indirect evidence for dark matter, but its fundamental nature remains unknown. B describes the primary piece of evidence, not the overall main idea about the mystery. C is incorrect because the passage states its gravitational effects can be observed. D is a true statement but incomplete; the main idea also includes the crucial fact that we know it exists through other means.
- Which sentence best describes the main point of the passage?
Answer: Cultural relativism is an approach for understanding cultures on their own terms without judgment.
The correct answer is D because it provides a clear and accurate definition of cultural relativism and its purpose, which is the focus of the passage. A represents a common misconception that the passage explicitly corrects. B gives a specific application of the principle, but it is not the main definition. C states the goal of the principle, but the main idea is about the principle itself as a method to achieve that goal.
- What is the main idea of this passage?
Answer: A set of architectural innovations enabled Gothic cathedrals to have tall, light-filled structures.
The correct answer is B because it explains the cause-and-effect relationship that is central to the passage: architectural innovations (the cause) led to the defining characteristics of height and light (the effect). A lists the innovations but doesn't explain their purpose or result. C makes a broad comparison to other periods that the passage does not support. D focuses on one result (the windows) but misses the main point about the structural systems that made them possible.
- What is the main idea of this passage?
Answer: Confirmation bias is a mental tendency that reinforces existing beliefs by favoring supportive information.
The correct answer is A because it provides a complete definition of confirmation bias and its effect, which is the central topic of the passage. B is the specific example used to illustrate the concept, not the main idea itself. C is too broad; the passage discusses one specific bias, not all errors in human thinking. D is a partial idea; the passage states that the bias also affects how we interpret and recall information, not just how we search for it.
- What is the main idea of this passage?
Answer: Volcanic eruptions, despite their danger, contribute to creating highly fertile agricultural soil.
The correct answer is D because it addresses the central contrast presented in the passage: the destructive nature of volcanoes versus their beneficial role in creating fertile soil. A is a partial idea that the passage acknowledges but then contrasts with the main point. B explains why the soil becomes fertile, but it is a supporting detail, not the main idea. C is a fact mentioned as an example, not the central argument.
- Which sentence best expresses the main idea of the passage?
Answer: Believing that abilities can be developed leads to greater persistence and achievement.
The correct answer is C because it links the core belief of a growth mindset ('abilities can be developed') to its primary outcomes ('greater persistence and achievement'), which is the central argument of the passage. A only defines the contrasting concept, not the main focus. B describes a characteristic of people with a growth mindset, which is a supporting detail. D is too general; the passage is specifically about the growth vs. fixed mindset regarding abilities, not all beliefs.
- The main point of the passage is that the Silk Road was...
Answer: an important network for both commercial and cultural exchange between civilizations.
The correct answer is C because it captures the two main functions of the Silk Road described in the passage: the trade of goods (commercial) and the exchange of ideas (cultural). A is too narrow, as the passage emphasizes that the exchange of ideas was 'more important.' B is factually incorrect according to the first sentence of the passage. D describes an important aspect of the cultural exchange but is not as comprehensive as the main idea, which also includes the trade of goods.
- What is the main idea of this passage?
Answer: Coral reefs can naturally adapt to environmental changes through reef switching, though this process has significant limitations and uncertainties.
When you encounter a main idea question, you need to identify the passage's central focus—the overarching point that ties all the details together, rather than getting distracted by specific supporting information.
This passage presents microplastics as a comprehensive environmental problem. It establishes their widespread presence ("ubiquitous in the environment"), explains their multiple origins (plastic waste breakdown, synthetic fibers, microbeads), discusses health concerns for both humans and marine life, and concludes that current solutions are inadequate. The main idea encompasses all these elements: microplastics are everywhere due to various sources, they pose health risks, and they're challenging to address.
Choice A focuses too narrowly on the research aspect. While the passage mentions ongoing studies, research is just one detail, not the central theme. Choice C emphasizes solutions and technology development, but the passage actually stresses that current approaches are insufficient—this misses the tone of the problem's difficulty. Choice D zeroes in on specific sources (clothing, personal care products) and effects (inflammation, behavioral changes), but these are supporting details about marine life impacts, not the passage's main point.
Choice B correctly captures the passage's full scope: widespread distribution from multiple sources, resulting health concerns, and the difficulty of addressing the problem with existing methods. It synthesizes all the key elements without getting trapped in specific details.
For main idea questions on reading comprehension tests, look for the answer that could serve as an umbrella covering all the passage's major points, not just the most interesting or specific details.
- What is the main point of this passage?
Answer: Roman aqueducts were sophisticated engineering projects vital to the health and growth of cities.
The correct answer is C because it connects the two main points of the passage: that aqueducts were advanced engineering feats and that they were crucial for the success of Roman cities. A describes how aqueducts worked, which is a detail, not the main idea. B is too broad, as the passage focuses only on aqueducts, not all Roman engineering. D lists the uses of the water but misses the larger point about the aqueducts' sophistication and importance for urban growth.
- What is the main idea of this passage?
Answer: Remote work has changed how companies measure productivity, revealing both improved individual performance and new collaborative challenges.
When you encounter a main idea question, you need to identify the passage's central focus—the overarching point that ties all the details together, rather than getting distracted by specific supporting information.
This passage presents microplastics as a comprehensive environmental problem. It establishes their widespread presence ("ubiquitous in the environment"), explains their multiple origins (plastic waste breakdown, synthetic fibers, microbeads), discusses health concerns for both humans and marine life, and concludes that current solutions are inadequate. The main idea encompasses all these elements: microplastics are everywhere due to various sources, they pose health risks, and they're challenging to address.
Choice A focuses too narrowly on the research aspect. While the passage mentions ongoing studies, research is just one detail, not the central theme. Choice C emphasizes solutions and technology development, but the passage actually stresses that current approaches are insufficient—this misses the tone of the problem's difficulty. Choice D zeroes in on specific sources (clothing, personal care products) and effects (inflammation, behavioral changes), but these are supporting details about marine life impacts, not the passage's main point.
Choice B correctly captures the passage's full scope: widespread distribution from multiple sources, resulting health concerns, and the difficulty of addressing the problem with existing methods. It synthesizes all the key elements without getting trapped in specific details.
For main idea questions on reading comprehension tests, look for the answer that could serve as an umbrella covering all the passage's major points, not just the most interesting or specific details.
- What is the main idea of this passage?
Answer: Decision fatigue is a psychological phenomenon where decision quality declines over time, but it can be managed through strategic approaches.
When you encounter a main idea question, you need to identify the passage's central focus—the overarching point that ties all the details together, rather than getting distracted by specific supporting information.
This passage presents microplastics as a comprehensive environmental problem. It establishes their widespread presence ("ubiquitous in the environment"), explains their multiple origins (plastic waste breakdown, synthetic fibers, microbeads), discusses health concerns for both humans and marine life, and concludes that current solutions are inadequate. The main idea encompasses all these elements: microplastics are everywhere due to various sources, they pose health risks, and they're challenging to address.
Choice A focuses too narrowly on the research aspect. While the passage mentions ongoing studies, research is just one detail, not the central theme. Choice C emphasizes solutions and technology development, but the passage actually stresses that current approaches are insufficient—this misses the tone of the problem's difficulty. Choice D zeroes in on specific sources (clothing, personal care products) and effects (inflammation, behavioral changes), but these are supporting details about marine life impacts, not the passage's main point.
Choice B correctly captures the passage's full scope: widespread distribution from multiple sources, resulting health concerns, and the difficulty of addressing the problem with existing methods. It synthesizes all the key elements without getting trapped in specific details.
For main idea questions on reading comprehension tests, look for the answer that could serve as an umbrella covering all the passage's major points, not just the most interesting or specific details.
- The main point of the passage is that...
Answer: physical exercise offers a wide range of significant physical and mental health benefits.
The correct answer is A because it encompasses all the different types of benefits mentioned in the passage—cardiovascular (physical), mood (mental), sleep, and energy. B is directly contradicted by the first sentence, which says the benefits go 'beyond just weight management.' C and D each focus on a single, specific benefit mentioned in the passage, making them supporting details rather than the main idea.
- Which sentence best expresses the main idea of the passage?
Answer: The printing press transformed society by making information widely available.
The correct answer is B because it captures the entire argument of the passage: the invention of the printing press led to the wide availability of information, which in turn had a massive impact on society. A is a key fact but not the main idea. C describes the situation before the printing press, which serves as context, not the central point. D is an overstatement; while the passage calls the invention 'revolutionary,' it does not claim it was the 'most important' in all of history.
- The main idea of the passage is that a personal budget is...
Answer: a valuable tool for managing money and achieving financial goals.
The correct answer is C as it summarizes the overall message: a budget is a positive tool for gaining control and achieving goals. A describes how to make a budget, not its purpose or main idea. B presents the negative view that the passage explicitly argues against. D creates a false comparison; the passage states that a budget helps you work toward long-term goals, not that it is less important than them.
- What is the main idea of this passage?
Answer: Vertical farming offers significant agricultural benefits for urban areas but faces considerable economic and energy-related challenges.
When you encounter a main idea question, you need to identify the passage's central focus—the overarching point that ties all the details together, rather than getting distracted by specific supporting information.
This passage presents microplastics as a comprehensive environmental problem. It establishes their widespread presence ("ubiquitous in the environment"), explains their multiple origins (plastic waste breakdown, synthetic fibers, microbeads), discusses health concerns for both humans and marine life, and concludes that current solutions are inadequate. The main idea encompasses all these elements: microplastics are everywhere due to various sources, they pose health risks, and they're challenging to address.
Choice A focuses too narrowly on the research aspect. While the passage mentions ongoing studies, research is just one detail, not the central theme. Choice C emphasizes solutions and technology development, but the passage actually stresses that current approaches are insufficient—this misses the tone of the problem's difficulty. Choice D zeroes in on specific sources (clothing, personal care products) and effects (inflammation, behavioral changes), but these are supporting details about marine life impacts, not the passage's main point.
Choice B correctly captures the passage's full scope: widespread distribution from multiple sources, resulting health concerns, and the difficulty of addressing the problem with existing methods. It synthesizes all the key elements without getting trapped in specific details.
For main idea questions on reading comprehension tests, look for the answer that could serve as an umbrella covering all the passage's major points, not just the most interesting or specific details.
