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(单选题)

Why do many plastics have different chemicals added to them?

A.To make them easy to break down.

B.To make them easy to get processed.

C.To make it possible for them to be recycled.

D.To make them stronger and more widely used.

参考答案:D

参考解析:

细节理解题。根据倒数第二段第一句“Many plastics have different chemicals added to them to make them more useful and powerful.”可知,加入其它化学物质的目的是让塑料更有用,更耐用。故选D。

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