24. Because capitals often attract a large population,

Question

BlackTom AI · Accepted Answer

Attracting a large population commonly causes urban problems such as overcrowding, traffic congestion, housing shortages, pollution, and strain on services — so the best completion is that many problems can result.

1. Relevant knowledge points and concepts
- Cause-and-effect relationships in sentence logic: the clause beginning with "Because..." states a cause, so the following clause should state a plausible effect.
- Urban geography and economics: when capitals concentrate people, infrastructure and services can be overwhelmed, producing social and environmental problems.
- Direction of causation: some statements describe causes that lead to population growth (reverse causation) rather than consequences of population growth.

2. Step-by-step reasoning
- Read the prompt: "Because capitals often attract a large population," — this is the cause clause.
- Ask: what logically follows as an effect of a large attracted population?
- Evaluate the options: which one is a consequence (effect) of population concentration?

3. Intermediate reasoning steps (no numeric calculations)
- A large population increases demand for housing, transport, water, sanitation, and jobs; mismatches create problems.
- Economic strength or availability of government jobs typically explain why people move to capitals (they attract people), so those are causes, not effects.

4. Why the correct answer is correct
- Option c: "there can be many problems." This directly states the expected effect: population concentration often produces various problems. It fits both grammatically and logically as the main clause completing the "Because..." sentence.

5. Why the other options are incorrect
- Option a: "they become economically strong." This reverses causation — capitals are often economically strong, which attracts people; attracting people does not necessarily make a capital economically strong.
- Option b: "they provide many government jobs." This is also a cause of population attraction (capitals provide gov jobs, so people move), not an effect of attracting a large population.

6. Conclusion
Therefore, the correct choice is c. there can be many problems. This matches the provided answer.

24. Because capitals often attract a large population,单项选择题

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