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單項(xiàng)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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單項(xiàng)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

單項(xiàng)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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