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【题目】Things made of plastic are usually _______, but they are _______ to get polluted.

A. cheap; easy B. cheap; easier

C. cheaper; easy D. cheaper; easier

【答案】D

【解析】cheap便宜的;easy 容易的;cheaper更便宜的;easier更容易的。句意:塑料制品通常更便宜,但是他们更容易被污染。结合语境可知选D。

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