[题目]Smog is not a natural p but caused by air pollution. 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】Smog is not a natural p but caused by air pollution.

【答案】phenomenon
【解析】phenomenon 名词phenomenon现象；这是一个可数名词单数形式，该词在句中做表语。句意：雾霾不是一个自然现象，而是被空气污染所导致的。

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