GMAT申友逻辑CR题库-Nitrogen dioxide is a pollutant emitted by automobiles. Catalytic converters, devices designed to reduce nitrogen dioxide emissions, have been-破解版08-真题答案解析

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CR23-33题

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.

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答案：

题干：Cataly

tic converters，这种装置会减少汽车污染物的排放。1933年所有的新车都使用了这种装置，几乎全境内的污染物排放都减少了。新车的比例在首都是最高的，但是自1993年之后排放物并没有实际的减少。问合理的解释 A 在使用的车大部分都是1993年之前造的，题干已经说了，新车的比例是高的，所以指向不对 B 1993年之后新车的销售量下降，无关 C 无关其他的污染物 D 题干要说明的是首都的人，这里说的是全国，这个范围扩大了 E 在首都行驶的车距离太短，这个装置没有发挥作用。虽然安装了这种装置，但是没有起到作用，这个车再多，污染物都是不会下降的，可以得到最终的结论，符合题意。