2. 公务员
  3. ______(为了减少城市的空气污染)，people have replaced petrol with natural gas in many motor vehicles．

______(为了减少城市的空气污染)，people have replaced petrol with natural gas in many motor vehicles．

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问题 ______(为了减少城市的空气污染)，people have replaced petrol with natural gas in many motor vehicles．
选项
答案To reduce levels of the air pollution in cities
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