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【单选题】
雾霾不是一朝一夕能解决的，我们参与保护大气的同时，还要学会加强自我防护，雾霾天我们应该怎么做呢？（）
A.
到户外进行体育锻炼
B.
打开门窗通风透气
C.
到超市等人多的地方
D.
减少出行，门窗
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