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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?
  • AMore of the cars in Donia's capital city were made before 1993 than after 1993. 分析该选项
  • BThe number of new cars sold per year in Donia has declined slightly since 1993. 分析该选项
  • CPollutants other than nitrogen dioxide that are emitted by automobiles have also been significantly reduced in Donia since 1993. 分析该选项
  • DMany Donians who own cars made before 1993 have had catalytic converters installed in their cars. 分析该选项
  • EMost car trips in Donia's capital city are too short for the catalytic converter to reach its effective working temperature. 分析该选项
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正确答案: E
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题目基本信息

  • 所属科目:逻辑CR
  • 题目来源1:GWD-39
  • 题目来源2:PREP08 Test 1-104
  • 正确率:40%
  • 难度:

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