新prep1-104 非问题中的问题

qujundi

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.


排除法可以选E，但是如果E正确的话，我想问1993年的significantly reduced 是什么原因？
请NN指点！

longshort

1993年，在全国大部分地方（一个大整体），installation of this converter是奏效的，所以使得most of country 的nitrogen dioxide emissions是减少了的。题目问的是为什么这个国家的首都（局部），在安装converter后，emmission没有显著的降低。不知道这样说有没有回答你的问题呢？

87338618

好吧，你仔細再看一下，這是矛盾題：預期A，結果B，請解釋。

qujundi

没有 significant decline since 1993，题目里只有 insignificant decline since 1993好像
yknxhdsy 发表于 2011-11-24 20:50

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.


我是问红色那部分的significantly reduced 原因，不是蓝色那部分

yknxhdsy

没有 significant decline since 1993，题目里只有 insignificant decline since 1993好像

qujundi

是的，就是引起1993 的significant decline的原因是什么。

87338618

你說的是 insignificant decline since 1993嗎?