There is pollution and fishes in the river now than 20 years ago.A. more lessB. more few

问题补充：

There is pollution and fishes in the river now than 20 years ago.

A. more, less

B. more, fewer

C. less, much

D. fewer, many

答案：

A. more, less

(答案→)B. more, fewer

C. less, much

D. fewer, many

解析：句意:现在比前的污染更严重，河里的鱼也更少了。pollution 污染，是一个不可数名词，由句意知现在的污染更严重了，故第一空用more；fish 鱼，可数名词，根据句意知污染严重了，那么鱼就更少了，故选B。