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

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单项选择题（）indicates unstable weather.

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单项选择题（）may be a warning for an approaching storm.

A.The persence of cirrus clouds
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Nimbus means（）.A.rainB.highC.layerD.cirrus

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A.rain
B.high
C.layer
D.cirrus

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