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【题目】At present there are more and more private cars. They have caused serious air________ (pollute).

【答案】pollution

【解析】

句意:目前有越来越多的私家车。它们造成了严重的空气污染。

pollute动词,污染。结合句意和空前air可知这里用短语“空气污染”air pollution,所以这里用pollute的名词形式pollution,故填pollution

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