单选集-X题卡

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1最佳选择题 3分

Althoughrecentyearshaveseensubstantialreductionsin

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2最佳选择题 3分

Althoughrecentyearshaveseensubstantialreductionsin

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3最佳选择题 3分

Althoughrecentyearshaveseensubstantialreductionsin

A. Further attempts to reduce emissions from gasoline-fueled vehicles will nor help lower urban air pollution levels.
B. Attempts to reduce the pollutants that an individual gasoline-fueled vehicle emits have been largely unsuccessful.
C. Few serious attempts have been made to reduce the amount of pollutants emitted by gasoline fueled vehicles.
D. Pollutants emitted by gasoline-fueled vehicles are not the most critical source of urban air pollution.

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4最佳选择题 3分

Althoughrecentyearshaveseensubstantialreductionsin

A. It is substantially less expensive than ethanol.
B. It could be provided to consumers through the existing motor fuel distribution system.
C. Its use would substantially reduce ozone levels.
D. Its use would make design improvements in individual vehicles feasibl

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5最佳选择题 3分

Althoughrecentyearshaveseensubstantialreductionsin

A. be somewhat lighter in total body weight than a conventional vehicle fueled with gasoline
B. be more expensive to operate than a conventional vehicle fueled with gasoline
C. have a larger and more powerful engine than a conventional vehicle fueled with gasoline
D. go average more miles per gallon than a "gasoline clone" vehicle fueled with methanol

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