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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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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单项选择题
We have low tide ______.
A.when water reaches its highest level
B.when water stops
C.when water no longer moves
D.when water reaches its lowest level
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