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[单项选择]Dark Forces Dominate Universe
The earth.moon.sun and all visible stars in the sky make up less than one percent of the universe.Almost all the rest is dark matter and dark energy,unknown forces that ______(51)astronomers.
Observations in recent years have changed the basic______ (52)of how the universe evolved and have indicated how little is known about the major forces and substances that______ (53) our world Astronomers now know that luminous(发光的)matter—stars,planets and hot gas----Accounts ______ (54) only about 0,4 percent of the universe.Non-luminous components,such as black holes and intergalactic(星系间的)gas,______ (55)up 3.6 percent The rest is either dark matter , about 23 percent,or dark energy,about 73 percent.
Dark matter.Sometimes ______ (56)“cold dark matter,”has been known for some time.Only recently have researchers come to understand the key role it ______ (57)formation of stars,planets and even people.
We ______ (58) our very existence to dark matter,” said phy
A. worry
B. move
C. puzzle
D. reject
[单项选择]
{{B}}Dark Forces Dominate
Universe{{/B}} The Earth, moon, sun and all visible stars in the
sky make up less than one per cent of the universe. Almost all the rest is dark
matter and dark energy, unknown{{U}} (1) {{/U}}that puzzle
astronomers. Observations in recent years have changed the basic
understanding of how the universe evolved and have emphasized for astronomers
how little is known{{U}} (2) {{/U}}the major forces and substances that
shaped our world: Astronomers now know that luminous
matter-stars, planets and hot gas — {{U}} (3) {{/U}}only about 0.4 per
cent of the universe. Non. luminous components, such as black holes and
intergalactic gas, make up 3.6 per cent. The rest is either dark matter, about
23 per cent, or dark energy, about 73 per cent. Dark matter,
sometimes called "c A. would B. must C. shall D. should
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