【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(duì)于自然來(lái)說(shuō)空氣污染是一個(gè)危險(xiǎn)。A danger一種危險(xiǎn)，to nature對(duì)于自然。Nature表大自然時(shí)前不加任何冠詞。此句意為通常我們認(rèn)為空氣污染對(duì)大自然有害。選D。

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