2. 外语
  3. We can eliminate pollution completely by the year of 2008. Controlling air pollution is another crucial objective; ______device

We can eliminate pollution completely by the year of 2008. Controlling air pollution is another crucial objective; ______device

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问题 We can eliminate pollution completely by the year of 2008.
Controlling air pollution is another crucial objective; ______devices can reduce the harmful gases emitted from the engine.
选项
答案pollution-control
解析 第10段倒数第2句，有必要在汽车尾部安装控制污染的装置来减少污染。
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大学英语六级

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