The air in mountain areas is              that in big cities.

A. as fresh as
B. fresher than
C. as dirty as
D. dirtier than
B
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科目：初中英語 來源：0101 模擬題 題型：單選題

The air in mountain areas is              that in big cities.
[     ]
A. as fresh as
B. fresher than
C. as dirty as
D. dirtier than

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