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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.

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.

个人愚见欢迎同学们指正

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.
（注意题目里表明了两个范围：1。 D国全国的车 2。D国首都的车）
题目：D国全国的车污染物有明显下降；首都（虽然有很多93年以后的车）但是污染物缺没有大幅度下降。

Which of the following, if true, most helps to explain the insignificant decline in nitrogen dioxide emissions in Donia’s capital city? 解释为什么首都汽车污染物没有大幅度下降？（主要紧扣：解释下降的程度和首都的汽车）

A. More of the cars in Donia’s capital city were made before 1993 than after 1993.
（A选项：我第一次读感觉有点乱，先保留，作为怀疑选项）
再读A选项：题目中给出了93年车在首都的保有量很高。但是这里说的是"Made". 93年之前Made的不一定现在还有很高的保有量。有点偷换概念。

B. The number of new cars sold per year in Donia has declined slightly since 1993.
（B选项：首先，没有紧扣首都车的这个范围。如果93年后的车sold降低，和A选项类似，偷换概念）

C. Pollutants other than nitrogen dioxide that are emitted by automobiles have also been significantly reduced in Donia since 1993.
（C选项：跳出“首都汽车”的范围，同时也跳出了Nitrogen污染物的范围，不考虑）

D. Many Donians who own cars made before 1993 have had catalytic converters installed in their cars.
（D选项：这里说的是Donians，乍一看有道理，但其实跳出了首都的这个范围，如果把D选项的范围改小到D国首都有车人，还沾边）

E. Most car trips in Donia’s capital city are too short for the catalytic converter to reach its effective working temperature.
（E选项：我选E。路程短，converter没有效果，所以去除污染物的效果不明显。紧扣了污染物和首都汽车）

我个人觉得很多时候选项那个正确与否都是相对而言的，这里看E最容易讲通。
谢谢大伙大家一起讨论

-- by 会员 melvinperson (2011/1/1 11:42:26)