单选题A series of brief showers accompanied by strong，shifting winds may occur along or some distance ahead of a(n)（）.Aupper front aloftBcycloneCoccluded frontDcold front
单选题
A series of brief showers accompanied by strong，shifting winds may occur along or some distance ahead of a(n)（）.
A
upper front aloft
B
cyclone
C
occluded front
D
cold front
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