根据下列文章，回答36～40题。In1784,fiveyearsbeforehebecamepresidentoftheUnitedStates,GeorgeWashington,52,wasnearlytoothless.Sohehiredadentisttotr ansplantnineteethintohisjaw-havingextr actedthemfromthemouthsofhisslaves.
That'safardifferentimagefromthecherry-tr ee-choppingGeorgemostpeoplerememberfromtheirhistorybooks.Butr ecently,manyhistorianshavebeguntofocusontherolesslaveryplayedinthelivesofthefoundinggeneration.TheyhavebeenspurredinpartbyDNAevidencemadeavailablein1998,whichalmostcertainlyprovedThomasJeffersonhadfatheredatleastonechildwithhisslaveSallyHemings.Andonlyoverthepast30yearshavescholarsexaminedhistoryfromthebottomup.Worksofseveralhistoriansrevealthemoralcompromisesmadebythenation'searlyleadersandthefragilenatureofthecountr y'sinfancy.Moresignificantly,theyarguethatmanyoftheFoundingFathersknewslaverywaswrong-andyetmostd idlittletofightit.
Morethananything,thehistorianssay,thefounderswerehamperedbythecultureoftheirtime.WhileWashingtonandJeffersonprivatelyexpresseddistasteforslavery,theyalsounderstoodthatitwaspartofthepoliticalandeconomicbedrockofthecountr ytheyhelpedtocreate.
Foronething,theSouthcouldnotaffordtopartwithitsslaves.Owningslaveswas"likehavingalargebankaccount,"saysWiencek,authorofAnImperfectGod:GeorgeWashington,HisSlaves,andtheCreationofAmerica.ThesouthernstateswouldnothavesignedtheConstitutionwithoutprotectionsforthe"peculiarinstitution,"includingaclausethatcountedaslaveasthreefifthsofamanforpurposesofcongressionalrepresentation.
Andthestatesmen'spoliticallivesdependedonslavery.Thethree-fifthsformulahandedJeffersonhisnarrowvictoryinthepresidentialelectionof1800byinflatingthevotesofthesouthernstatesintheElectoralCollege.onceinoffice,JeffersonextendedslaverywiththeLouisianaPurchasein1803;thenewlandwascarvedinto13states,includingthreeslavestates.
Still,JeffersonfreedHemings'schildren-thoughnotHemingsherselforhisapproximately150otherslaves.Washington,whohadbeguntobelievethatallmenwerecreatedequalafterobservingthebraveryoftheblacksoldiersduringtheRevolutionaryWar,overcamethestr ongoppositionofhisrelativestogranthisslavestheirfreedominhiswill.onlyadecadeearlier,suchanactwouldhaverequiredlegislativeapprovalinVirginia.
第36题：GeorgeWashington\'sdentalsurgeryismentionedto
A．showtheprimitivemedicalpracticeinthepast.
B．demonstr atethecrueltyofslaveryinhisdays.
C．str esstheroleofslavesintheU.S.history.
D．revealsomeunknownaspectofhislife.
正确答案：C根据文章的逻辑一致性和联系，从第二段的“Butr ecently,manyhistorianshavebeguntofocusontherolesofslavery…..”可以看出作者在第一段举GeorgeWashing(第一任美国总统)对待奴隶的例子是为了说明“美国历史上奴隶制的作用”。因此选C。
