单项选择题
Cumulonimbus clouds can produce（）.
A.dense fog and high humidity
B.gusty winds，thunder，rain or hail，and lightning
C.clear skies with the approach of a cold front
D.a rapid drop in barometric pressure followed by darkness
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相关考题
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单项选择题
Cumulonimbus clouds are most likely to accompany a(n)（）.
A.high pressure system
B.cold front
C.warm front
D.occluded front -
单项选择题
Clouds that form as small white flakes or scaly globular masses covering either small or large portions of the sky are（）.
A.cirrus
B.cirrostratus
C.altostratus
D.cirrocumulus -
单项选择题
Clouds are classified according to their（）.
A.size
B.moisture content
C.altitude and how they were formed
D.location in a front
