问题补充：
---If there are people driving, there will be air pollution.
---Yes, the air will be fresher.
A. less; less
B. less; fewer
C. few; fewer
D. fewer; less
答案：
A. less; less
B. less; fewer
C. few; fewer
(答案→)D. fewer; less
解析：本题主要考察的是few 修饰可数名词复数形式，而little 修饰不可使名词，根据本题的意思，选择答案为D
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