— If there are trees the air will be cleaner.— I agree. Then there will be less pollutio

问题补充：

— If there are trees, the air will be cleaner.

— I agree. Then there will be less pollution.

A. much

B. less

C. fewer

D. more

答案：

A. much

B. less

C. fewer

(答案→)D. more

解析：此题重点考查四个单词的含义，根据语境可知要选择比较级，故用more表示有更多的树，空气就会越清新。污染就会越少。