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.
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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
单项选择题
The water level of an ocean falls ______.
A．when there is a low tide
B．when the water is pulled away from the earth
C．when the moon disappears over the horizon
D．when water no longer moves
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