2014职称英语考试理工类冲刺练习之完形填空5

　　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 physicist Paul Steinhardt and a co-author of a review on dark matter which____(59)not long ago in the journal Science. “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 dark matter 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 for C of D to

　　55 A make B keep C set D get

　　56 A written B called C 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

　　60 A element B shape C formation D power

　　61 A with B as C form D beside

　　62A turned B worked C led D attempted

　　63 A unknow B interesting C different D visible

　　64 A form B outcome C effect D source

　　65 A seized B proven C caught D grasped

　　答案：51 C 52 A 53 D 54B 55 A 56 B 57 D 58 B 59 A 60C 61 B 62 C 63 A 64 C 65 B

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