【題目】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，但是他們更容易被污染。結(jié)合語(yǔ)境可知選D。

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