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1最佳选择题 3分

Text4 Althoughrecentyearshaveseensubstantialr

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2最佳选择题 3分

Text4 Althoughrecentyearshaveseensubstantialr

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3最佳选择题 3分

Text4 Althoughrecentyearshaveseensubstantialr

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4最佳选择题 3分

Text4 Althoughrecentyearshaveseensubstantialr

A. Further attempts to reduce emission from gasoline-fueled vehicles will not help lower urban air-pollution level.
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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5最佳选择题 3分

Text4 Althoughrecentyearshaveseensubstantialr

A. be somewhat lighter in total body weight than a conventional vehicle fueled with gasoline
B. have a larger and more powerful engine than a conventional vehicle fueled with gasoline
C. average more miles per gallon than a "gasoline alone" vehicle fueled with methanol
D. have a larger and heavier fuel tank than a "gasoline alone" vehicle fueled with methanol

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