当小汽车的数量成倍增加时.污染也加倍甚至更严重了. When cars doubled,the pollution is also doubled,or 题目和参考答案——青夏教育精英家教网—

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4. 当小汽车的数量成倍增加时，污染也加倍甚至更严重了。

When cars doubled,the pollution is also doubled,or

4. the number of;is;even worse

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