2. 外语
  3. All living things need air ______. Why do cars cause less pollution than before?Because ______.

All living things need air ______. Why do cars cause less pollution than before?Because ______.

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问题 All living things need air ______.
Why do cars cause less pollution than before?Because ______.
选项 A、environmental engineers designed an object for cars removing harmful pollution
B、the cars are very small
C、the cars don’t use gasoline any longer
答案A
解析 现在，汽车排出的废气更少了，这归功于环境工程师们的辛勤劳动。B和C没有提到。
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