－How about the pollution in the countryside?－Luckily it’s not as serious as in the big c

问题补充：

－How about the pollution in the countryside?

－Luckily, it’s not as serious as in the big cities.

A. that

B. it

C. one

D. those

答案：

(答案→)A. that

B. it

C. one

D. those

解析：考查代词的用法。“乡下的污染情况怎样了？”“很幸运，它不像大城市那样严重。”that用于比较级，且指代不可数名词。those指代复数形式。故选A。