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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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
To do well in sports, ______.
A．a training course must be followed
B．you must follow a training course
C．there is a training course to follow
D．a schedule for training must be followed
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