内蒙古GRE考试模拟卷7Word文件下载.docx
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内蒙古GRE考试模拟卷7Word文件下载.docx
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本卷共分为2大题50小题,作答时间为180分钟,总分100分,60分及格。
一、单项选择题(共25题,每题2分。
每题的备选项中,只有一个最符合题意)
1.Question41-50:
InDeathValley,California,oneofthehottest,mostaridplacesinNorthAmerica,thereismuchsalt,andsaltcandamagerocksimpressively.Inhabitantsofareaselsewhere,wherestreetsandhighwaysaresaltedtocontrolice,arefamiliarwiththeresultingrustanddeteriorationoncars.Thatatteststothechemicallycorrosivenatureofsalt,butitisnotthewaysaltdestroysrocks.Saltbreaksrocksapartprincipallybyaprocesscalledcrystalpryingandwedging.Thishappensnotbysoakingtherocksinsaltwater,butbymoisteningtheirbottomswithsaltwater.SuchconditionsexistinmanyareasalongtheeasternedgeofcentralDeathValley.There,saltywaterrisesfromthegroundwatertablebycapillaryactionthroughtinyspacesinsedimentuntilitreachesthesurface.Moststoneshavecapillarypassagesthatsucksaltwaterfromthewetground.DeathValleyprovidesanultra-dryatmosphereandhighdailytemperatures,whichpromoteevaporationandtheformationofsaltcrystalsalongthecracksorotheropeningswithinstones.Thesecrystalsgrowaslongassaltwaterisavailable.Liketreerootsbreakingupasidewalk,thegrowingcrystalsexertpressureontherockandeventuallyprytherockapartalongplanesofweakness,suchasbandinginmetamorphicrocks,beddinginsedimentaryrocks,orpreexistingorincipientfractions,andalongboundariesbetweenindividualmineralcrystalsorgrains.Besidescrystalgrowth,theexpansionofhalitecrystals(thesameaseverydaytablesalt)byheatingandofsulfatesandsimilarsaltsbyhydrationcancontributeadditionalstresses.Arockdurableenoughtohavewithstoodnaturalconditionsforaverylongtimeinotherareascouldprobablybeshatteredintosmallpiecesbysaltweatheringwithinafewgenerations.ThedominantsaltinDeathValleyishalite,orsodiumchloride,butothersalts,mostlycarbonatesandsulfates,alsocausepryingandwedging,asdoesordinaryice.Weatheringbyavarietyofsalts,thoughoftensubtle,isaworldwidephenomenon.Notrestrictedtoaridregions,intensesaltweatheringoccursmostlyinsalt-richplacesliketheseashore,nearthelargesalinelakesintheDryValleysofAntarctica,andindesertsectionsofAustralia,NewZealand,andcentralAsia.Theword"
exert"
inline14isclosestinmeaningto
A.put
B.reduce
C.replace
D.control
2.Questions22-31:
ThefirstpeoplestoinhabitwhattodayisthesoutheasternUnitedStatessustainedthemselvesashuntersandgathers.SometimesearlyinthefirstmillenniumA.D.,however,theybegantocultivatecornandothercrops.Gradually,astheybecamemoreskilledatgardening,theysettledintopermanentvillagesanddevelopedarichculture,characterizedbythegreatearthenmoundstheyerectedasmonumentstotheirgodsandastombsfortheirdistinguisheddead.MostoftheseearlymoundbuilderswerepartoftheAdena-Hopewellculture,whichhaditsbeginningsneartheOhioRiverandtakesitsnamefromsitesinOhio.Theculturespreadsouthwardintothepresent-daystatesofLouisiana,Alabama,Georgia,andFlorida.Itspeoplesbecamegreattraders,barteringjewellery,pottery,animalpelts,tools,andothergoodsalongextensivetradingnetworksthatstretchedupanddowneasternNorthAmericaandasfarwestastheRockyMountains.AboutA.D.400,theHopewellculturefellintodecay.Overthenextcenturies,itwassupplantedbyanotherculture,theMississippian,namedaftertheriveralongwhichmanyofitsearliestvillageswerelocated.ThiscomplexcivilizationdominatedtheSoutheastfromaboutA.D.700untilshortlybeforetheEuropeansbeganarrivinginthesixteenthcentury.Atthepeakofitsstrength,abouttheyear1200,itwasthemostadvancedcultureinNorthAmerica.LiketheirHopewellpredecessors,theMississippiansbecamehighlyskilledatgrowingfood,althoughonagranderscale.Theydevelopedanimprovedstrainofcorn,whichcouldsurviveinwetsoilandarelativelycoolclimate,andalsolearnedtocultivatebeans.Indeed,agriculturebecamesoimportanttotheMississippiansthatitbecamecloselyassociatedwiththeSun---theguarantorofgoodcrops.Manytribescalledthemselves"
childrenoftheSun"
andbelievedtheiromnipotentpriest-chiefsweredescendantsofthegreatsungod.AlthoughmostMississippianslivedinsmallvillages,manyothersinhabitedlargetowns.Mostofthesetownsboastedatleastonemajorflat-toppedmoundonwhichstoodatemplethatcontainedasacredflame.Onlypriestsandthosechargedwithguardingtheflamecouldenterthetemples.Themoundsalsoservedasceremonialandtradingsites,andattimestheywereusedasburialgrounds.Theword"
bartering"
inline9isclosestinmeaningto
A.producing
B.exchanging
C.transporting
D.l
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