GWD5-Q38,没讨论过！

legnawen

GWD5-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.

不明白题目中的only是什么作用，怎么解释？

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.

不明白题目中的only是什么作用，怎么解释？

xiexiang

only 表示 仅仅， 我明白E 能都解释矛盾， 但是D似乎也不错啊~

hazardous

如果是d，则会让emission的decline更大，不能explain为何emission的decline是insignificant的.
e说明，因为大多数车开的里程太短，以至于不能让车里的converter达到可以最有效工作中的温度，也就是说，converter一直是在低效率工作，不能有效的减少emission的排放，解释了问题。

tania_zhang

如果是A呢，旧车比较多，好像也可以解释排放量没有明显下降啊。

superstoic

A选项和原文是矛盾的，原文已经说了Yet although the proportion of new cars in Donia's capital city has always been comparatively high

chamcham

Yet although the proportion of new cars in Donia’s capital city has always been comparatively high

这句话应该是说 在donia's capital city 里的新车比例相对于上一句的 most of the country 来看算高的吧，是capital city和其他地方比，但并不能说明 在capital city 本身 而言新车比旧车多吧，A> 没有E> 好，但本身应该不是 和题目相悖的吧？？ 还请NN说明。

zhaoyiqing

说下自己看法，做题时选了D，但是是我看错语法了。。。直接把D理解为很多拥有1993年以前的车的车主在93年之前已经装了XX仪器。。所以当时觉得是对的。。但其实D的内容是很多拥有1993年以前旧车的车主在法令出来后装了装置，就是说93年以后donia新车也有装置，老车也有装置，那废气的排放量必定是大大减少，而不是题目中说的没有显著减少

只是提醒下可能跟我犯了一样错误的童鞋

zhangluE

是  insignificant  不significant

handapink

有没有人觉得D是对的= = 我就同意有旧车车主自己在1993年以前就装了converter。。。
这个比E make sense吧。。。
PS 我今天才开始准备。。。菜鸟一只

jingjane222

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