单选题Cirrus clouds followed by cirrostratus then altostratus，stratus，and occasionally nimbostratus indicate the approach of a(n)（）.Acold frontBwarm frontCtropical frontDoccluded front
单选题
Cirrus clouds followed by cirrostratus then altostratus，stratus，and occasionally nimbostratus indicate the approach of a(n)（）.
A
cold front
B
warm front
C
tropical front
D
occluded front
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