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

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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