The nature of dark matter is unknown.It cannot be seen or detected directly.Astronomers know it is there because of its effects on celestial(天上的) objects that can be seen and measured.But the most dominating force of all in the universe is called dark energy, a recently proven power that astronomers say is causing the galaxies in the universe to separate at a faster and faster speed.
21.We know from the text that ________.
A.all visible stars are very important in the universe
B.the basic understanding of the universe evolution was totally wrong
C.dark matter is also known as dark energy
D.dark energy makes up about three quarters of the universe
22.The text tells us “dark matter” ________.
A.plays an important part in forming stars,planets and humans
B.has been fully understood by researchers
C.remains an unimportant force to the universe like dark energy
D.has nothing to do with the formation of the universe today
23.“The major forces and substances that shaped our world” (in Para.2) refers to _______.
A.luminous matterB.nonluminous matter
C.dark matterD.ordinary matter
24.According to Paul Steinhardt,our existence today ________.
A.depends mainly on dark matter
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