→ ame312:thanks 08/20 23:07
※ 引述《ame312 ()》之銘言：
: 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?
重點在於全國都有顯著下降 而在city裡卻只有小幅變動
選項A 可以削弱原文中"新車proportion較高"的立論
但A選項僅說首都裡1993以前生產的汽車較1993年以後生產的汽車多
首都裡1993年以後生產的汽車的比例仍有可能遠高過全國平均
可能首都新車有55%是1993年前生產 然而全國平均是70% 欠缺進一步論述
: 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.
: 正確答案:(E)
: 想請教為何(A)選項不能是正確答案?
: 我一開始的想法是:
: 文中提到新車比例很高，
: (Yet although the proportion of new cars in Donia's capital city has
: always been comparatively high.)
: 但可能有些新車是1993之前製造的，
: 所以雖然新車比例高，但nitrogen dioxide emissions仍高?
: 還是說我誤會了題目中的意思，
: "Catalytic converters have been required in all new cars in Donia since 1993"
: 跟何時(1993前/後)製造出廠無關，只要是新車就必須安裝此converters~~
: 謝謝
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