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题干：Duringrecentyearswehaveheardmuchabout"race":howthisracedoescertainthingsandthatracebelievescertainthingsandsoon.Yet,the（1）phenomenonofraceconsistsofafewsurfaceindications.Wejudgeraceusually（2）thecoloringoftheskin:awhiterace,abrownrace,ayellowraceandablackrace.But（3）youweretoremovetheskinyoucouldnot（4）anythingabouttheracetowhichtheindividualbelonged.Thereis（5）inphysicalstructure,thebrainortheinternalorgansto（6）adifference.Therearefourtypesofblood.（7）typesarefoundineveryrace,andnotypeisdistincttoanyrace.Humanbrainsarethe（8）.Noscientistscouldexamineabrainandtellyoutheracetowhichtheindividualbelonged.Brainswill（9）insize,butthisoccurswithineveryrace.（10）doessizehaveanythingtodowithintelligence.Thelargestbrain（11）examinedbelongedtoapersonofweak（12）.Ontheotherhand,someofourmostdistinguishedpeoplehavehad（13）brains.Mentaltestswhicharereasonably（14）shownodifferencesinintelligencebetweenraces.Highandlowtestresultsbothcanberecordedbydifferentmembersofanyrace.（15）equaleducationaladvantages,therewillbenodifferenceinaveragestandings,eitheronaccountofraceorgeographicallocation.Individualsofeveryrace（16）civilizationtogobackwardorforward.Trainingandeducationcanchangetheresponseofagroupofpeople,（17）enablethemtobehaveina（18）way.Thebehaviorandidealsofpeoplechangeaccordingtocircumstances,buttheycanalwaysgobackorgoontosomethingnew（19）isbetterandhigherthananything（20）thepast.
题目：（19）
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