单项选择题

Why does the author mention both Boston and Chicago

A．To demonstrate positive and negative effects of growth.
B．To exemplify cities with and without mass transportation.
C．To show mass transportation changed many cities.
D．To contrast their rate of growt
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单项选择题
The author mentions Chicago in the second paragraph as an example of a city, ______.
A．which is large
B．which is used as a model for land development
C．where the development of land exceeded population growth
D．with an excellent mass transportation system
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