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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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