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

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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

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