单项选择题

（）are mainly caused by the gravitational pull of the moon.

A.Tides
B.Sea
C.Swell
D.Wind

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单项选择题

A.Falling barometric pressure
B.Rising barometric pressure
C.The circulations of winds
D.The change of wind direction

单项选择题

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

单项选择题

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