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
　D
　　emission散發(fā)物，發(fā)射。exposure(to)暴露于：They believe that their health problems are the result of years of exposure to fine cotton dust.(他們認為，他們的健康問題是多年來暴露于棉花粉塵所致。)expansion膨脹，擴大；Heat causes the expansion of gas.本題譯文：正如汽車的生產(chǎn)和使用越來越多一樣，汽車的排氣管的散發(fā)物內(nèi)所含的有毒氣體量也在增加。
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