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104. (24883-!-item-!-188;#058&001256) (GWD 5-Q38)
Nitrogen dioxide is a pollutant emitted by automobiles. Catalytic converters, devices designed to reduce nitrogen dioxide emissions, have been required in all new cars in Donia since 1993, and as a result, nitrogen dioxide emissions have been significantly reduced throughout most of the country. Yet although the proportion of new cars in Donia's capital city has always been comparatively high, nitrogen dioxide emissions there have showed only an insignificant decline since 1993. Which of the following, if true, most helps to explain the insignificant decline in nitrogen dioxide emissions in Donia's capital city? A. More of the cars in Donia's capital city were made before 1993 than after 1993. B. The number of new cars sold per year in Donia has declined slightly since 1993. C. Pollutants other than nitrogen dioxide that are emitted by automobiles have also been significantly reduced in Donia since 1993. D. Many Donians who own cars made before 1993 have had catalytic converters installed in their cars. E. Most car trips in Donia's capital city are too short for the catalytic converter to reach its effective working temperature.
标准答案是E,可以。但D为什么不对?题目中问为什么1993年DC城中的ND减少的不明显,D说因为老的汽车已经安装了CC这种减排装置,那么相当于本来DC城中的ND污染就轻,自然减少不明显。不是也很合理吗? |
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