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: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