[题目]Air pollution is caused by the following : about half of the problem is caused by vehicles. 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】Air pollution is caused by the following _________: about half of the problem is caused by vehicles.

【答案】reasons

【解析】

试题分析：空气污染是由下面的原因造成的。考查名词“原因”reasons

练习册系列答案

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