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

【答案】phenomenon
【解析】phenomenon 名詞phenomenon現(xiàn)象；這是一個(gè)可數(shù)名詞單數(shù)形式，該詞在句中做表語。句意：霧霾不是一個(gè)自然現(xiàn)象，而是被空氣污染所導(dǎo)致的。

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