According to the passage, ______ causes the most serious problem. Why do optimists mention London and New York? ______.

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问题 According to the passage, ______ causes the most serious problem.
Why do optimists mention London and New York? ______.

选项 A、There are a lot of people in London and New York.
B、They are developing countries.
C、They are crowded.
D、Because of the orderly and safe environment in London and New York.

答案D

解析 文中提到London、New York,是因为一些乐观主义者提出了在一些人口多的大城市完全可以拥有有序和安全的环境。所以正确答案为D选项。
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