There will be trees and pollution in the future.A. less moreB. more fewerC. more lessD.

问题补充：

There will be trees and pollution in the future.

A. less, more

B. more, fewer

C. more, less

D. less; less

答案：

A. less, more

B. more, fewer

(答案→)C. more, less

D. less; less

解析：less，little的比较级，更少的，修饰不可数名词；more，much和many的比较级，更多的；fewer，few的比较级，更少的，修饰可数名词复数；句意：将来会有更多的树木，更少的污染。结合语境可知树木是可数名词，污染是不可数名词，故选C。