单项选择题

The water level of an ocean rises ______.

A．when the moon is directly over the water
B．when the moon disappears over the horizon
C．when there is no tide
D．when there is a low tide
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单项选择题
What causes tide
A．The pull of the sun and the moon.
B．The heat of the sun.
C．The shape of the moon.
D．The light of the moon.
单项选择题
The water level of the oceans rises and falls ______.
A．often
B．often in a year
C．twice
D．twice a day
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