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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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

单项选择题

According to the passage we know most modern VDTs （）

A．can change the working conditions for the operators
B．can limit the dangers from the electro-magnetic radiation
C．can also affect the growth of the cells
D．can protect the health of the computer operators