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題庫解析 > 解釋題型 > CR23-33題

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CR23-33題

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：

題干：Cataly

tic converters，這種裝置會減少汽車污染物的排放。1933年所有的新車都使用了這種裝置，幾乎全境內(nèi)的污染物排放都減少了。新車的比例在首都是最高的，但是自1993年之后排放物并沒有實(shí)際的減少。問合理的解釋 A 在使用的車大部分都是1993年之前造的，題干已經(jīng)說了，新車的比例是高的，所以指向不對 B 1993年之后新車的銷售量下降，無關(guān) C 無關(guān)其他的污染物 D 題干要說明的是首都的人，這里說的是全國，這個(gè)范圍擴(kuò)大了 E 在首都行駛的車距離太短，這個(gè)裝置沒有發(fā)揮作用。雖然安裝了這種裝置，但是沒有起到作用，這個(gè)車再多，污染物都是不會下降的，可以得到最終的結(jié)論，符合題意。