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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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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

單項選擇題

Nimbus means（）.

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

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