the air in mountain areas is _ that in big cities.A.as fresh as.Bfresher.than C as.dirty.as D.dirtier than

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the air in mountain areas is _ that in big cities.A.as fresh as.Bfresher.than C as.dirty.as D.dirtier than
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the air in mountain areas is _ that in big cities.A.as fresh as.Bfresher.than C as.dirty.as D.dirtier than
the air in mountain areas is _ that in big cities.A.as fresh as.Bfresher.than C as.dirty.as D.dirtier than

the air in mountain areas is _ that in big cities.A.as fresh as.Bfresher.than C as.dirty.as D.dirtier than
B