单项选择题

Why are Boston and Chicago mentioned

A．To demonstrate the development of big cities.
B．To exemplify cities with and without mass transportation
C．To show mass transportation changed many cities.
D．To contrast their rate of growth and development.

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单项选择题

What is the function of mass transportation

A．It stimulated the development of real estate.
B．It causes the conflict between large cities and small cities.
C．It leads to well-planned urban sprawl.
D．It encourages the stability of urban life.