单项选择题

In astronomical terms, a cluster ______.

A．consists of galaxies
B．makes up superclusters
C．consists of groups
D．makes up a group
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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
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.
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