题目内容
11.Cars pollute theair (空气),so remember:Use your legs.分析 汽车污染空气,所以记住:用你的腿.
解答 根据所给出的汉语意思可知,空气为"air",它是不可数名词,故填air的原形.
点评 如果填写的单词为名词,要注意它可数或不可数形式.
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