问题
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
答案
参考答案：A
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（）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
参考答案：A