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  3. Recent studies have shown that air into a house often has higher concentrations of contaminants than heavily polluted air outsid

Recent studies have shown that air into a house often has higher concentrations of contaminants than heavily polluted air outsid

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问题 Recent studies have shown that air into a house often has higher concentrations of contaminants than heavily polluted air outside.
选项
答案into—in
解析 译文：最近的研究表明：与室外严重污染的空气相比，室内的空气通常污染物浓度更高。
分析：考查介词。into表示动作的方向，此处表示所处位置应当用介词in。
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