As more and more cars are produced and used, so thefrom their exhaust-pipes contains an even larger volume ofpoisonous gas.<br>Aexposure<br>distribution)B<br>C、emission<br>D.expansion

As more and more cars are produced and used, so thefrom their exhaust-pipes contains an even larger volume ofpoisonous gas.
Aexposure
distribution)B
C、emission
D.expansion

出自：郑州轻工业大学英语4

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