单项选择题

The principal idea of this article is ______.

A．the attraction of the sun and the moon
B．the sun, the moon and the wind
C．the changing tides
D．the factors affecting the tides
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单项选择题
According to the passage, it is clear that the force of the moon ______.
A．is not as important as that of the wind
B．is less than half that of the sun
C．is the primary cause of the alternate rise and fall of the surface of the seas
D．does not influence the rise and fall of the surface of the seas
单项选择题
If a high tide occurs at 8:00 a.m., the following low tide will occur at about ______.
A．8:00 p.m.
B．midnight
C．2:30 p.m.
D．1:30 p.m.
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