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2015年职称英语理工类考试完形填空练习(3)

发布时间:2016-03-01  编辑:查字典英语网小编

  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 ______astronomers.

  Observations in recent years have changed the basic______ of how the universe evolved and have indicated how little is known about the major forces and substances that______ our world Astronomers now know that luminousmatterstars,planets and hot gas----Accounts ______ only about 0,4 percent of the universe.Non-luminous components,such as black holes and intergalacticgas,______ up 3.6 percent The rest is either dark matter , about 23 percent,or dark energy,about 73 percent.

  Dark matter.Sometimes ______ cold dark matter,has been known for some time.Only recently have researchers come to understand the key role it ______ formation of stars,planets and even people.

  We ______ our very existence to dark matter, said physicist Paul Steinhardt and a co-author of a review on dark matter which ______ not long ago in the journal Science.

  Dark matter dominated the structure 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 a frothof an ocean of dark matter.The darkmatter dumpsand the ordinary matter falls into it.That to the formation of the stars and galaxies.Without dark matter , there would be virtually no structures in the universe

  The nature of dark matter is ______ It cannot be seen or detected directly

  Astronomers know it is there because of its______ on celestialobjects that can be seen and measured.

  But the most dominating force of all in the universe is called dark energy, a recently ______ 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 puzzleD reject

  52 A understanding B value C pattern D structure

  53 A changedB described C designed D shaped

  54 A in B for C ofD 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 appearedB carriedC published D contributed

  60 A elementB shape C formation D power

  61 A with B as C form D beside

  62A turned B workedC 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 provenC caught D grasped

  

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