Now more and more people walk or ride bikes instead of taking the taxi to reduce              pollution.

A. air
B. soil
C. water
D. noise
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科目：初中英語 來源：模擬題 題型：單選題

Now more and more people walk or ride bikes instead of taking the taxi to reduce              pollution.
[     ]
A. air
B. soil
C. water
D. noise

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