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。