Clouds appearing in the following order: cirrus, cirrostratus, altostratus, stratus, and nimbostratus usually indicate the approach of a(n) ______.
A.warm front
B.occluded front
C.medium front
D.cold front
正确答案：A
云按以下顺序排列：卷云卷层云高层云层云和雨层云通常显示暖锋接近
Cloudsappearinginthefollowingorder:cirruscirrostratu
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