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雅思阅读配对题课件.ppt

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第八讲：雅思阅读配对题一、形式：三部分组成二、特点：难以捉摸三、分类四、基本解题步骤1.配对一方是特殊定位词AWhydohumans,virtuallyaloneamongallanimalspecies,displayadistinctleftorrighthandedness?Notevenourclosestrelativesamongtheapespossesssuchdecidedlateralasymmetry,aspsychologistscallit.Yetabout90percentofeveryhumanpopulationthathaseverlivedappearstohavebeenright-handed.ProfessorBryanTurneratDeaconUniversityhasstudiedtheresearchliteratureonleft-handednessandfoundthathandednessgoeswithsidedness.Sonineoutoftenpeopleareright-handedandeightareright-footed.Henotedthatthisdistinctiveasymmetryinthehumanpopulationisitselfsystematic.Humansthinkincategories:blackandwhite,upanddown,leftandright.It'sasystemofsignsthatenablesustocategoriesphenomenathatareessentiallyambiguous.BResearchhasshownthatthereisgeneticorinheritedelementtohandedness.Butwhileleft-handednesstendstoruninfamilies,neitherleftnorrighthandlerswillautomaticallyproduceoff-springwiththesamehandedness;infactabout6percentofchildrenwithtworight-handedparentswillbeleft-handed.However,amongtwoleft-handedparents,perhaps40percentofthechildrenwillalsobeleft-handed.Withonerightandoneleft-handedparent,15to20percentoftheoffspringwillbeleft-handed.Evenamongidenticaltwinswhohaveexactlythesamegenes,oneinsixpairswilldifferintheirhandedness.CWhatthenmakespeopleleft-handedifitisnotsimplygenetic?Otherfactorsmustbeatworkandresearchershaveturnedtothebrainforclues.Inthe1860stheFrenchsurgeonandanthropologist,DrPaulBoca,madetheremarkablefindingthatpatientswhohadlosttheirpowersofspeechasaresultofastroke(abloodclotinthebrain)hadparalysisoftherighthalfoftheirbody.Henotedthatsincethelefthemisphereofthebraincontrolstherighthalfofthebody,andviceversa,thebraindamagemusthavebeeninthebrain'slefthemisphere,Psychologistsnowbelievethatamongrighthandedpeople,probably95percenthavetheirlanguagecentreinthelefthemisphere,while5percenthaveright-sidedlanguage,Left-handers,however,donotshowthereversepatternbutinsteadamajorityalsoSome30percenthaverighthemispherelanguage.DDrBrinkman,abrainresearcherattheAustra