單項選擇題（）are mainly caused by the gravitational pull of the moon.
A.Tides
B.Sea
C.Swell
D.Wind
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1.單項選擇題（）generally indicates that a gale or storm is approaching.
A.Falling barometric pressure
B.Rising barometric pressure
C.The circulations of winds
D.The change of wind direction
2.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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題型：單項選擇題
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題型：單項選擇題