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
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
单项选择题
The author says that trends are toward the _________.
A．growth of cities and shrinking of suburban areas
B．growth of both rural and suburban areas
C．growth of urban and suburban areas
D．growth of suburban areas and shrinking of cities
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