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

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

【答案】D

【解析】

試題分析：考查冠詞的用法。人們對于自然來說空氣污染是一個危險。A danger一種危險，to nature對于自然。Nature表大自然時前不加任何冠詞。此句意為通常我們認為空氣污染對大自然有害。選D。

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