单项选择题
（）is a silvery cloud in the front of feathers or fibres seen high up against a blue sky.
A.Cirrostratus
B.Cirrus
C.Cirrocmulus
D.Altostratus
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相关考题
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单项选择题
（）are mainly caused by the gravitational pull of the moon.
A.Tides
B.Sea
C.Swell
D.Wind -
单项选择题
（）generally indicates that a gale or storm is approaching.
A.Falling barometric pressure
B.Rising barometric pressure
C.The circulations of winds
D.The change of wind direction -
单项选择题
（）indicates unstable weather.
A.The persence of cirrus clouds
B.The low-hanging stratus clouds
C.The altocumulus clouds
D.The massive cumulus clouds
