单项选择题

If a high tide occurs at 8:00A．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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单项选择题
It can be concluded from this article that the attractive force of the sun on the Earth's oceans is about（）

A．half that of the moon
B．equal to more than half that of the moon
C．equal to that of the moon
D．twice that of the moon
单项选择题
Which of the following factors is NOT mentioned as affecting the tide（）

A．the sun
B．the depth of the ocean
C．the moon
D．the winds
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