问题
单项选择题
MIST is caused by（）.
A.forest fires
B.smoke from industrial areas
C.dust or sand storms
D.water droplets with the relative humidity more than 95%
答案
参考答案：D
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MIST is caused by（）.
A.forest fires
B.smoke from industrial areas
C.dust or sand storms
D.water droplets with the relative humidity more than 95%
参考答案：D