2021版高考英语大一轮复习Unit4Astronomythescienceofthestars练习新人教版必修3.doc

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1、Unit4　Astronomy:thescienceofthestarsⅠ.阅读AScientistsannouncedonThursday,February11,2016,atapressconferenceinWashington,D.C.thatthemorethanhalf-centurysearchforgravitationalwavesfinallysucceeded.Theyconfirmedthattheyhaddetectedgravitationalwavescausedbytwoblackhole

2、smixingtogetherabout1.3billionyearsago.IthadbeenthefirsttimethephenomenonwasdirectlydetectedsinceitwaspredictedbyAlbertEinstein100yearsago.AChina-ledspacegravitationalwavedetectionprojectisrecruiting(招募)researchersfromaroundtheworld,chinanews.comreported.TheTianq

3、inprojectwasstartedbySunYat-senUniversityinZhuhai.Itcentersonresearchofkeytechnologiesinspacegravitationalwavedetection.Tomaketheprojectmorecompetitive,globaltalentsinareassuchasgravitytheory,spacegravityexperimentsandprecisionmeasurementaresoughtwithanannualsala

4、ryofupto1millionyuan($153,000),accordingtothereport.Gravitationalwavesarenoteasilydetectable.Whentheyreachtheearth,anextremelysensitivedetectorisneeded,asothersourcesofnoisecanoverwhelmthesignal.LuoJun,presidentofSunYat-senUniversitysaidthedetectionofgravitationa

5、lwavesisahugechallengeandtheprojectreflectstheresearchcompetenceofChina.The15-billion-yuanprojectaimstosendwave-detectionsatellitesintospacein15to20yearswithconstructionofaresearchcenterandobservatorytobestartedsoon.Researcherswilllikelycooperatewithotherscientis

6、tsfromtheEuropeanSpaceAgency’sLISAProject.Gravitationalwavesareripples(涟漪)inspacetimegeneratedduringtheearliestmomentoftheuniverse,whentheuniverseexperiencedabriefbutdisorderedperiodofexpansion.Thedetectionofgravitationalwavesisbelievedtohelpscientistsunderstandm

7、oremysteriesoftheuniverse.71.Whatcanwelearnaboutgravitationalwaves?A.Theycausedblackholestomixtogether.B.Theycameoutabouthalfacenturyago.C.TheywereprovedtruebyAlbertEinstein.D.Theyhavebeendiscoveredrecently.2.Accordingtothepassage,theTianqinprojectisintendedto　　　

8、. A.developtechnologiestodetectspacegravitationalwavesB.attracttalentedresearchersfromacrosstheglobeC.conductvariousspacegravityexperimentsD.seekprecisionmeasu