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

【答案】pollution

【解析】

句意:目前有越來越多的私家車。它們造成了嚴(yán)重的空氣污染。

pollute動詞,污染。結(jié)合句意和空前air可知這里用短語“空氣污染”air pollution,所以這里用pollute的名詞形式pollution,故填pollution

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