单选题The first indications a mariner will have of the approach of a warm front will be （）.Alarge cumulonimbus (thunderclouds) building upBhigh cirrus clouds gradually changing to cirrostratus and then to altostratusCfog caused by the warm air passing over the cooler waterDlow dark clouds accompanied by intermittent rain
单选题
The first indications a mariner will have of the approach of a warm front will be （）.
A
large cumulonimbus (thunderclouds) building up
B
high cirrus clouds gradually changing to cirrostratus and then to altostratus
C
fog caused by the warm air passing over the cooler water
D
low dark clouds accompanied by intermittent rain
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