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

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单项选择题

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

单项选择题

Cloud formations are minimal when the（）.

A.surface temperature and temperature aloft are equal
B.surface temperature and temperature aloft differ greatly
C.barometric pressure is very low
D.relative humidity is very high

单项选择题

Cirrus clouds followed by cirrostratus then altostratus，stratus，and occasionally nimbostratus indicate the approach of a(n)（）.

A.cold front
B.warm front
C.tropical front
D.occluded front