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單項(xiàng)選擇題

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

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單項(xiàng)選擇題

Clouds are classified according to their（）.

A.size
B.moisture content
C.altitude and how they were formed
D.location in a front

單項(xiàng)選擇題

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