问题 选择题

The air in mountain areas is ____ that in big cities.

A.as fresh as

B.fresher than

C.as dirty as

D.dirtier than

答案

答案:B

此题考察形容词的比较级或原级。fresher than... 通常乡村的空气要比城市中的空气新鲜, 所以排除A,C, D选项, 虽然A选项本身结构是正确的。

单项选择题
单项选择题