问题补充：
—If there are people driving, there will be air pollution.
— Yes , the air around us will be fresher and cleaner.
A. fewer; less
B. less; fewer
C. fewer; fewer
D. less; less
答案：
(答案→)A. fewer; less
B. less; fewer
C. fewer; fewer
D. less; less
解析：句意：如果更少的人开车，空气污染也会减少。Fewer 更少，是few的比较级，后接可数名词复数，less更少，是little的比较级，后接不可数名词；故选A。
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