单项选择题

The nearer a planet is to the sun, ______.

A．the lighter it is
B．the heavier it is
C．the greater gravity it exerts
D．the taster it orbits
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单项选择题
Which of the following is TRUE according to the passage
A．Ninety percent of all the matter in the universe is invisible.
B．Dark matter causes visible matter to behave in a strange way.
C．Galaxies in a cluster sometimes behave in an unusual manner.
D．Invisible matter keeps galaxies together with gravity.
单项选择题
We can conclude that this article is intended for ______.
A．general readers
B．scientists
C．students majoring in physics
D．astronomers
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