单选题
发布日期:2022-06-01
Further attempts to reduce emissions from gasoline-fueled vehicles will not help lower urban air-pollution levels.
Attempts to reduce the pollutants that an individual gasoline-fueled vehicle emits have been largely unsuccessful.
Few serious attempts have been made to reduce the amount of pollutants emitted by gasoline-fueled vehicles.
Pollutants emitted by gasoline-fueled vehicles are not the most critical source of urban air pollution.
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