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 tide
D．the factors affecting the tide

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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.
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
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