Choose a, b, c or d as the best answer.4. Which statement best summarises the main idea of this paragraph?

Question

BlackTom AI · Accepted Answer

The paragraph’s central claim is a policy recommendation: carbon taxes should be used to reduce greenhouse gases.

1) Relevant knowledge points and concepts
- Main idea: the single most important point the author wants the reader to take away (often stated in a topic sentence or implied by the paragraph’s emphasis).
- Supporting details vs. thesis: examples, evidence, or consequences support the main idea but are not the main idea themselves.
- Carbon tax: a policy tool that charges emitters for carbon emissions to discourage greenhouse gas production.

2) Step-by-step reasoning
- Read each option and ask: which statement could be the paragraph’s thesis, with other sentences serving as support?
- Option b is an explicit recommendation (policy prescription). If the paragraph argues for use of carbon taxes and provides reasons or evidence, that is a clear main idea.
- Options a, c, and d are factual or descriptive statements that could be background or supporting points but are less likely to be the paragraph’s primary claim if the paragraph ends by advocating a specific action.

3) Intermediate logical steps (no numeric calculations)
- Determine scope: option a (“global warming is an enormous…problem”) is broad and sounds like background context.
- Determine focus: option c (“carbon pollution is the main contributor…”) is a causal claim that might be one supporting fact.
- Determine specificity: option d (“climate change has impacted global temperatures”) is a specific observed effect and likely supportive detail.
- Option b presents a prescriptive conclusion about what should be done—this is typically the paragraph’s main idea when advocacy appears.

4) Why the correct answer is correct
- A paragraph that culminates in or centers on advocating carbon taxes places the recommendation at its core. That policy prescription organizes the paragraph’s evidence and examples, making it the main idea.

5) Why the other options are incorrect
- a: Too general; describes the problem rather than proposing the solution.
- c: A causal assertion that could support a recommendation but is not itself a policy prescription.
- d: A specific consequence; informative but not the central argument if the paragraph argues for action.

Conclusion: The best summary of the paragraph’s main idea is option b: Carbon taxes should be used to reduce greenhouse gases. This matches the provided correct answer.

Choose a, b, c or d as the best answer.4. Which statement best summarises the main idea of this paragraph?单项选择题

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