单项选择题

With which of the following subjects is the passage mainly concerned

A．Types of mass transportation.
B．Instability of urban life.
C．How supply and demand determine land use.
D．The effect of mass transportation on urban expansion.

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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

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