【題目】People are wearing masks to cover their __________ and noses to prevent smog. (mouth)

【答案】mouths

【解析】

句意:人們帶著口罩遮住嘴和鼻子以防煙霧。
考查名詞的復(fù)數(shù)形式。句中主語(yǔ)people為復(fù)數(shù)名詞,所以遮住的嘴也不止一張,應(yīng)該用mouth的復(fù)數(shù)形式mouths,故填mouths。

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