單項(xiàng)選擇題()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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1.單項(xiàng)選擇題()indicates unstable weather.

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

2.單項(xiàng)選擇題()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