单项选择题

Cirrus clouds are composed primarily of（）.

A.ice crystals
B.water droplets
C.snow crystals
D.nitrogen

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单项选择题

A.elevation
B.temperature
C.wind speed
D.latitude

单项选择题

A.apparent wind speed only
B.true wind speed and true wind direction
C.true wind speed only
D.apparent wind speed and true wind direction

单项选择题

A.high clouds
B.middle clouds
C.low clouds
D.vertical development clouds