单项选择题

Which of the following factors will not affect the time of the tide（）

A．The position of the sun and the moon.
B．The mass of the moon.
C．The wind.
D．All of the above mentioned factors.

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单项选择题

It can be concluded from this article that the attraction of the sun is（）

A．more than half that of the moon
B．more than that of the moon
C．more than twice that of the moon
D．half that of the moon

单项选择题

According to this article, it is clear that the force of the moon（）

A．is not as important as that of the wind
B．is less than half as much as the sun
C．causes 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