With which of the following subjects is the passage mainly concerned? Why does the author mention both Boston and Chicago?

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问题 With which of the following subjects is the passage mainly concerned?
Why does the author mention both Boston and Chicago?

选项 A、To demonstrate positive and negative effects of growth.
B、To show that mass transit changed many cities.
C、To exemplify cities with and without mass transportation.
D、To contrast their rates of growth.

答案B

解析
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