Dark matter dominated the structure (60)in the early universe,Steinhardt said.For the first few billion years dark matter contained most of the mass of the universe You can think of ordinary matter (61) a froth(泡沫)of an ocean of dark matter.The darkmatter dumps(结成块)and the ordinary matter falls into it.That (62) to the formation of the stars and galaxies(星系).
Without dark matter , there would be virtually no structures in the universe The nature of dark matter is (63)It cannot be seen or detected directly.
Astronomers know it is there because of its (64)on celestial(天体的)objects that can be seen and measured.
But the most dominating force of all in the universe is called dark energy, a recently (65)power that astronomers say is causing the galaxies in the universe to separate at a faster and faster speed.
51 A worry B move C puzzle D reject
52 A understanding B value C pattern D structure
53 A changed B described C designed D shaped
54 A in B forC of D to
55 A make B keep C set D get
56 A written B calledC identified D seen
57 A signed B stressed C acted D played
58 A believe B owe C feel D regard
59 A appeared B carried C published D contributed
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