單項選擇題（）indicates unstable weather.
A.The persence of cirrus clouds
B.The low-hanging stratus clouds
C.The altocumulus clouds
D.The massive cumulus clouds
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1.單項選擇題（）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
2.單項選擇題Nimbus means（）.
A.rain
B.high
C.layer
D.cirrus
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