题目内容
18.Air is amixture of gases with a certain quantity of solids and liquids.(mix)分析 空气是一种有一定数量固体和液体的气体混合物.
解答 答案:mixture 根据a____of gases,可知应该用名词形式.mix,动词,混合.名词形式,mixture,混合物.a+可数名词单数,故填:mixture.
点评 本题主要考查可数名词单数,名词形式,mixture,混合物.a+可数名词单数,要注意名词形式.
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