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— If there are _____people driving, there will be ______air pollution.
— Yes, the air will be fresher


  1. A.
    less; less
  2. B.
    less; fewer
  3. C.
    fewer; fewer
  4. D.
    fewer; less
D
根据后文people 为可数名词复数,pollution为不可数名词,又根据需要,要用比较级,故选D
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