单项选择题

Nearly half of the increase in metropolitan population is accounted for by the ______.

A．expansion of existing urban areas
B．growth of the suburbs
C．migration of farm areas
D．growth of small towns
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单项选择题
The tone of this article is ______.
A．imaginative and pessimistic
B．imaginative and optimistic
C．factual and pessimistic
D．factual and optimistic
单项选择题
The selection describes the growth of metropolitan areas as ______.
A．gradual
B．explosive
C．erratic
D．leisurely
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