轻松掌握英语实用口语：空气污染
W: Why do you wear a mask?M: The air is too dirty, especially in the streets.
W: I have the same feeling.
M: Everyday when I wash my face, I find the water turns black.
W: But I don't like wearing a mask, and it's not the effective way to solve
the problem.
M: I know. But what can we do? We have to go to school by bike.
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