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As more and more cars are produced and used, so the from their exhaust-pipes con

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As more and more cars are produced and used, so the from their exhaust-pipes con

As more and more cars are produced and used, so the _____ from their exhaust-pipes contains an even larger volume of poisonous gas.

A．exposureB．distributionC．expansionD．emission

试题答案

D

解析

标签：thesousedexhausttheir

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