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.
参考答案是E，翻看了以前讨论的帖子，NN们多偏向E这个答案。
但是，我还是想坚持A。
E。这个答案，如果我还没有联系GMAT逻辑前我一定会选择E的。但是，GMAT逻辑是要就事论事，不要偏离我们讨论的话题。A这个答案完全符合这个精神。
我认为A正确的理由是这样的: although the proportion of new cars in Donia’s capital city has always been comparatively high, 这是原文的前提，那么我们就必须解释为什么new cars增加了，而污染并未明显下降。答案肯定是这些new car有问题，这才是gmat的逻辑精神。这些new car 大部分都是1993年后生产的，More of the cars in Donia’s capital city ，A答案一再强调了in Donia’s capital city , 也就是因为在这个城市这些1993年前的生产的new car 没有安装新的设备，所以造成即使new car比率增长，但是污染减少不明显。 答案A 强调了两点：1。most of the new car, 2, in Donia’s capital city 。我认为是完美的正确答案。
E。从逻辑上没错，但是并没有回答原文里new car 增加这个前提。它不是就是论事的精神，是GMAT里面的无关的选项。
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