英语阅读作业有答案Word文档格式.doc

英语阅读作业有答案Word文档格式.doc

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TheMississippiRiveritselfcompletelychangedcharacter,developingsuddenrapidsandwhirlpools.Severaltimesitchangeditscourse,andonce,accordingtosomeobservers,itactuallyappearedtorunbackwards.FewpeoplewerekilledintheNewMaridearthquakes,probablysimplybecausefewpeoplelivedintheareain1811;

buttheseverityoftheearthquakesareshownbythefactthattheshockwavesrangbellsinchurchtowersinCharleston,SouthCarolina,onthecoast.BuildingsshookinNewYorkCity,andclockswerstoppedinWashington,D.C.ScientistsnowknowthatAmerica'

stwomajorfaultsareessentiallydifferent.TheSanAndreasisahorizontalboundarybetweentwomajorlandmassesthatareslowlymovinginoppositedirections.Californiaearthquakesresultwhenthemovementofthesetwomassessuddenlylurches（倾斜）forward.

TheNewMadridfault,ontheotherhand,isaverticalfault;

atsomepoints,possiblyhundredsofmillionsofyearsago,rockwaspusheduptowardthesurface,probablybyvolcanoesunderthesurface.Suddenly,thevolcanoescooledandtherockcollapsed,leavinghugecracks.Evennow,therockcontinuestosettledownwards,andsuddensinkingmotionstrigger（触发）earthquakesintheregion.Thefaultitself,alargecrackinthislayerofrock,withdozensofothercracksthatsplitofffromit,extendsfromnortheastArkansasthroughMissouriandintosouthernlllinois.

ScientistswhohavestudiedtheNewMadridfaultsaytherehavebeennumeroussmallerquakesintheareasince1811;

thesesmallerquakesindicatethatlargeronesareprobablycoming,butthescientistssayhavenomethodofpredictingwhenalargeearthquakewilloccur.

1.Thispassageismainlyabout　　C　　.

A.theNewMadridfaultinMissouri　　

　B.thecausesoffaults　

　C.theSanAndreasandtheNewMadridfaults　　　　　　

　D.currentscientificknowledgeaboutfault　　

2.TheNewMadridfaultis　　A　　　.

　A.averticalfault

　B.ahorizontalfault

　C.amoreseriousfaultthantheSanAndreasfault

　D.responsibleforformingtheMississippiRiver　

　3.Wemayconcludefromthepassagethat　　　C　　.

　A.Californiawillbecomeanislandinfuture

　B.theNewMadridfaultwilleventuallydevelopamountainrangeinMissouri

C.itisprobablyasdangeroustoliveinMissouriasinCalifornia　　

D.AbigearthquakewilloccurtoCaliforniasoon　

　4.Thispassageimpliesthat　　　B　　　.

　A.horizontalfaultsaremoredangerousthanverticalfaults.

　B.Verticalfaultsaremoredangerousthanhorizontalfaults

　C.Californiawillbreakintopiecesbyaneventualearthquake

　D.Earthquakesoccuronlyaroundfaultareas　　

5.Asusedinthefirstsentenceofthefourthparagraph,thewordessentially

means　　C　　.

　A.greatly　　

　B.basically　　　

　C.extremely

D.necessarily

Passage2

In1960-1961,Chad（乍得）harvested9800tonsofcottonseedforthefirsttimeinitshistory,andputouttheflagalittletoosoon.Theeffortsoftheauthoritiestogetthepeasantsbacktowork,astheyhadslackedoff（松懈）agreatdealthepreviousyearduringindependencecelebrations,largelycontributedtoit.Also,rainswerewellspaced,andcontinuedthroughthewholemonthofOctober.Ifthe1961-1962totalisbacktotheregionof45000tons,itismostlybecauseeffortsslackenedagainandsowingwasstartedtoolate.

TheaveragedateofsowingisaboutJuly1st.Ifthisdateissimplymovedupfifteenortwentydays,30000to60000tonsofcottonaregained,dependingontheyear.ThepeasantinChadsowshismillet（小米）first,anditishardtocriticizethisinstinctiveprioritygiventohisdailybread.Anessentialreasonforhislatenesswithsowingcottonisthatatthetimewhenheshouldleavetopreparethefieldshehasjustbarelysoldthecottonofthepreviousseason.Theworkrequiredtosow,ingreatheat,ispsychologicallyfarmoredifficultifone'

spocketsarefullofmoney.Thedateofcottonsalesshouldthereforebemovedforwardasmuchaspossible,andpurchasesofequipmentanddraughtanimalsencouraged.

Peasantsshouldalsobeencouragedtosavemoney,tohelpthemthroughthedifficultperiodbetweenharvests.Ifnecessarytheyshouldbeforcedtodoso,byhavingthepaymentsforcottongiventothemininstallments（分期付款）.Thelastpaymentwouldbem