The air in mountain areas is ____ that in big cities.A．as fresh asB．fresher than_刷题宝

题干

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

A．as fresh as

B．fresher than

C．as dirty as

D．dirtier than

上一题下一题 0.85难度单项选择更新时间:2011-10-31 02:38:40

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