单项选择题

The writer regards the change to a "Plastic and Light Metal Age" in the near future as _________.

A．necessary
B．desirable
C．improbable
D．logical

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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

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

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