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1、One[2016届上海市虹口区高三英语二模试题】SectionBDirections:Readthefollowingthreepassages.Eachpassageisfollowedbyseveralquestionsorunfinishedstatements.ForeachofthemtherearefourchoicesmarkedA,B,CandD・Choosetheonethatfitsbestaccordingtotheinformationgiveninthepassageyouhavejustread.Scien
2、tistsDetectGravitationalWavesUGOPressConferenceQMV201S>WashingtonOCWhatisgravitationalwaves（引力波）？Scientistshaveforthefirsttimeobservedripplesinthefabricofspacetime（吋空涟漪）calledgravitationalwaves,arrivingattheearthfromaseverelydestructiveeventinthedistantuniverse.Itconfir
3、msamajorpredictionofAlbertEinstein，s1915generaltheoryofrelativityandopensauniquenewwindowontotheuniverse,accordingtoagroupofscientistsatapressconferenceinWashingtononThursday.“Thisistrulyscientificmoonshot.Wedidi匚Welandedonthemoon「declaredDavidReitz,executivedirectoroft
4、heLIGOLaboratoryatCaltech,attheconferenceintheNationalPressClub.AccordingtotheNationalScienceFoundation（NSF）experts,gravitationalwavescarryinformationabouttheirdramaticoriginsandaboutthenatureofgravitythatcannotbeobtainedfromelsewhere・Physicistshaveconcludedthatthedetec
5、tedgravitationalwaveswereproducedduringthefinnlfractionofcisecond（千分之一秒）ofthecombinationoftwoblackholestoproduceasingle,muchbiggerturningblackhole.ThisfierceshockoftwoblackholeshadbeenpredictedbutneverobservedbyNSF.ThegravitationalwavesweredetectedonSept14,2015at5:51amE
6、DTbybothofthetwinLaserInterferometerGravitational-waveObservatory（LIGO）detectors,locatedinLivingston,Louisiana,andHanford,Washington.Basedontheobservedsignals,LIGOscientistsestimatethattheblackholesforthiseventwereabout29and36timestheweightofthesun,andtheeventtookplace1
7、.3billionyearsago.Aboutthreetimestheweightofthesunwaschangedintogravitationalwavesinafractionofasecond~withapeakpoweroutputabout50timesthatofthewholevisibleuniverse.Bylookingatthetimeofarrivalofthesignals一thedetectorinLivingstonrecordedtheevent7milliseconds（毫秒）beforethe
8、detectorinHanford一scientistscansaythatthesourcewaslocatedintheSouthernHemisphere,accordingtoapressreleasefromN
