[問題]GWD11-20

[ergh]

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.

ans:E

想請問答案A為何不對？答案E不是很明顯超出題目範圍嗎？

[hccill]

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.


A.More of the cars in Donia’s capital city were made before 1993 than after 1993.
=>和題目敘述相反,因為題目倒數第二行說the proportion of new cars in Donia’s capital city has always been comparatively high,也就是新車的比率一定是高於舊車的,所以A就錯囉~

E.Most car trips in Donia’s capital city are too short for the catalytic converter to reach its effective working temperature.
=>E是說,因為D城市的車程太短,以致於沒有辦法是catalytic converter 達到能夠運轉的溫度
所以,雖然新車比率遠遠大於舊車->但因為沒有辦法達到有效運作的溫度
->nitrogen dioxide只有下降一點點,就解釋得通囉~

open to discuss~

[ergh]

可是題目中並沒說明catalytic converter運轉時需要的條件阿～～
這樣不就是自己作延申推論嗎？

[hccill]

像這種explain類型的題目,需要找第三他因來解釋題目中的矛盾現象,所以並不會有延伸推論的問題~