单项选择题

A.Falling barometric pressureB.Rising barometric pressu……

（）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.

A.The persence of cirrus clouds
B.The low-hanging stratus clouds
C.The altocumulus clouds
D.The massive cumulus clouds

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

A.The persence of cirrus clouds
B.The low-hanging stratus clouds
C.The altocumulus clouds
D.The massive cumulus clouds

单项选择题Nimbus means（）.

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

单项选择题Alto stands for（）.

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

单项选择题（）is an indication that the weather is about to clear.

A.Rising clouds
B.Lowering clouds
C.Thickening clouds
D.Scattering clouds