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题目材料:

The passage suggests which of the following about air pollution?
  • AFurther attempts to reduce emissions from gasoline-fueled vehicles will not help lower urban air-pollution levels.
  • BAttempts to reduce the pollutants that an individual gasoline-fueled vehicle emits have been largely unsuccessful.
  • CFew serious attempts have been made to reduce the amount of pollutants emitted by gasoline-fueled vehicles.
  • DPollutants emitted by gasoline-fueled vehicles are not the most critical source of urban air pollution.
  • EReductions in pollutants emitted by individual vehicles have been offset by increases in pollution from sources other than gasoline-fueled vehicles.

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