問(wèn)題補(bǔ)充：
單選題
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
網(wǎng)友答案：
熱心網(wǎng)友 1樓
D解析 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(rèn)為，他們的健康問(wèn)題是多年來(lái)暴露于棉花粉塵所致。)expansion膨脹，擴(kuò)大；Heat causes the expansion of gas.本題譯文：正如汽車(chē)的生產(chǎn)和使用越來(lái)越多一樣，汽車(chē)的排氣管的散發(fā)物內(nèi)所含的有毒氣體量也在增加。
