All living things need air ______. Which is not said that can pollute our air?

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问题 All living things need air ______.
Which is not said that can pollute our air?

选项 A、Smoke from our homes.
B、Smoke from buses.
C、Smoke from trucks.

答案A

解析文章通篇仅讲到汽车排出的废气污染空气，没有提到从家里出采的烟尘。因此正确答案为A。

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