单项选择题

The title that best expresses the idea of this passage is _________.

A．New Uses for Plastics
B．How One Age Succeeds Another.
C．Advantages of Plastics
D．Limitations on the Use of Plastics
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单项选择题
Decentralization is best defined as ______.
A．movement from the central city to nu'al areas
B．movement from the central city to the suburbs
C．disorderly expansion of the central city
D．shrinking of metropolitan
单项选择题
One aspect of the recent population trend is the _________.
A．development of complexes of cities
B．increasingly great distance between cities
C．transformation of cities into suburbs
D．growth of many small towns
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