单项选择题

A.The persence of cirrus cloudsB.The low-hanging stratu……

（）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

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单项选择题Nimbus means（）.

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

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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
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单项选择题（）is formed when the droplets or ice crystals in clouds have become sufficiently large to fall to the ground.

A.Humidity
B.Temperature
C.Precipitation
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单项选择题（）reters to be amount of water vapour in the air.

A.Humidity
B.Temperature
C.Precipitation
D.Wind