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. fewer; fewer
D. fewer; less
答案：
A. less; less
B. less; fewer
C. fewer; fewer
(答案→)D. fewer; less
解析：fewer，形容词few的比较级，更少的，修饰可数名词复数；less，little的比较级，更少的，修饰不可数名词。句意：如果有更少的人驾车，就会有更少的空气污染。——是的，空气就会更新鲜。上文中people用作复数名词，下文中pollution为不可数名词，结合语境可知选D。
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