Air is a_______of gases with a certain quantity of solids and liquids. (mix)mixt

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问题 Air is a_______of gases with a certain quantity of solids and liquids. (mix)

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答案 mixture

解析不定冠词a后面用名词，故应用mix的名词mixture。

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Airisa_______ofgaseswithacertainquantityofsolidsandliquids.(mix)mixt