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【题目】It is generally considered that air pollution is ______ danger to ______ nature.

A. /; a B. /; the C. /; / D. a; /

【答案】D

【解析】

试题分析:考查冠词的用法人们对于自然来说空气污染是一个危险。A danger一种危险,to nature对于自然。Nature表大自然时前不加任何冠词。此句意为通常我们认为空气污染对大自然有害。选D。

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