单选题A line of clouds，sharp changes in wind direction，and squalls are most frequently associated with a(n)（）.Aoccluded frontBwarm frontCcold frontDwarm sector
单选题
A line of clouds，sharp changes in wind direction，and squalls are most frequently associated with a(n)（）.
A
occluded front
B
warm front
C
cold front
D
warm sector
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