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标题: GWD5-38 [打印本页]

作者: della111 时间: 2005-5-4 13:29
标题: GWD5-38

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?

More of the cars in Donia’s capital city were made before 1993 than after 1993.

The number of new cars sold per year in Donia has declined slightly since 1993.

Pollutants other than nitrogen dioxide that are emitted by automobiles have also been significantly reduced in Donia since 1993.

Many Donians who own cars made before 1993 have had catalytic converters installed in their cars.

Most car trips in Donia’s capital city are too short for the catalytic converter to reach its effective working temperature.

我认为选D 答案是E 不明白请NN指点啊

作者: 蓝夕叶子 时间: 2005-5-4 14:22

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作者: tonyadidas 时间: 2005-5-4 16:39

安了装置就应该减少N的排放，但首都没有。解释：首都的车子开不了多远，装置要求起作用的温度没达到，所以没有减少N的排放。D说1993年前就安了装置，文说1993年才开始要求在新车上装装置。妹妹的想法应该是1993年前就装了，所以1993年前后都一样很正常，是不是这么想的呢？那么，哥哥想对你说，D没有特别说首都的车子93年前都装了设备，那么就是D国所有的车都是这样的，那么为什么其他地区N的排放量减少了呢？你看对不对啊？

另外留个小贴士给你哦，如果文中有比较或差异,正确选项就有比较或差异，这是新东方狒狒大人的心得哦

作者: della111 时间: 2005-5-4 17:50
呵呵谢谢楼上的明白！！

作者: 阿土莎莎 时间: 2007-11-13 13:44

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