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时间:2018-03-28
《2014届高考英语一轮复习 unit4 earthquakes阅读理解全方位训练1 新人教版必修1》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、2014届高考英语一轮复习全方位配套训练人教版必修一Unit4Earthquakes阅读理解1第Ⅰ组AEveryonehasheardoftheSanAndreasfault(断层),whichconstantlythreatensCaliforniaandtheWestCoastwithearthquakes.ButhowmanypeopleknowabouttheequallyseriousNewMadridfaultinMissouri?BetweenDecemberof1811andFebruaryof1812,threemajorearthq
2、uakesoccurred,allcenteredaroundthetownofNewMadrid,Missouri,ontheMississippiRiver.Propertydamagewassevere.Buildingsintheareawerealmostdestroyed.Wholeforestsfellatonce,andhugecracksopenedintheground,releasingsomestrongsmellchemicals.TheMississippiRiveritselfcompletelychangedcharac
3、ter,developingsuddenrapidsandwhirlpools(激流和漩涡).Severaltimesitchangeditscourse,andonce,accordingtosomeobservers,itactuallyappearedtorunbackwards.FewpeoplewerekilledintheNewMadridearthquakes,probablysimplybecausefewpeoplelivedintheareain1811;buttheseverityoftheearthquakeswasshownb
4、ythefactthattheshockwavesrangbellsinchurchtowersinCharleston,SouthCarolina,onthecoast.BuildingsshookinNewYorkCity,andclockswerestoppedinWashington,D.C.ScientistsnowknowthatAmerica’stwomajorfaultsareessentiallydifferent.TheSanAndreasisahorizontal(水平的)boundarybetweentwomajorlandma
5、ssesthatareslowlymovinginoppositedirections.Californiaearthquakesresultwhenthetwomassesmakeasuddenmove.TheNewMadridfault,ontheotherhand,isaverticalfault;atsomepoint,possiblyhundredsofmillionsofyearsago,rockwaspusheduptowardthesurface,probablybyvolcanoesunderthesurface.Suddenly,t
6、hevolcanoescooledandtherockcollapsed,leavinghugecracks.Evennow,therockcontinuestosettledownwards,andsuddensinkingmotionscauseearthquakesintheregion.Thefaultitself,alarge10crackinthislayerofrock,withdozensofothercracksthatsplitofffromit,extendsfromnortheastArkansasthroughMissouri
7、andintosouthernIllinois.ScientistswhohavestudiedtheNewMadridfaultsaytherehavebeennumeroussmallerquakesintheareasince1811;thesesmallerquakesindicatethatlargeronesareprobablycoming,butthescientistssaytheyhavenomethodofpredictingwhenalargeearthquakewilloccur.1.Thispassageismainlyab
8、out.A.theNewMadridfaultB.theSanAndreasC.thecaus
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