2015年职称英语理工类考试完形填空练习(3)

　　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