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

【答案】mouths

【解析】

句意:人们带着口罩遮住嘴和鼻子以防烟雾。
考查名词的复数形式。句中主语people为复数名词,所以遮住的嘴也不止一张,应该用mouth的复数形式mouths,故填mouths

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