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- Air_______ is one of the biggest problems in the world today

- Yes. We must take action to make the air less_______.

A. pollution; pollution B. pollute; pollution

C. pollution; pollute D. pollution; polluted

 

D

【解析】

试题分析:句意:—空气污染是当今世界上最大的污染之一。—是的。我们必须采取措施空气污染减少。空气污染是名词,故填pollution,polluted过去分词表被动,故选D。

考点:考查名词和非谓语动词的用法。

 

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