听力原文及答案Unit 11 Left-handedness.doc

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1、Unit11Left-handednessPartBListeningTasksPassage1WhyAreSomePeopleLeft-handed?WordBankmentala.relatingtotheactivityofthemindorbrain精神的；脑力的adoptv.totakesomeoneelse’schildintoone’sfamilyandmakeitlegallyone’sownchild收养involvementn.participation卷入；牵连identicala.exactlythe

2、same完全相同的birthparentsone’sbiologicalparents亲生父母adoptedparentsone’snon-biologicalparents养父母identicaltwinstwinsdevelopedfromthesameeggandthereforealmostalwaysofthesamesexandverymuchalikeinappearance同卵双生子PrinceCharles（英）查尔斯王子PrinceWilliam（英）威廉王子Script:Researchhasshown

3、that90%ofpeoplenaturallyusetheirrighthandsformosttasks.Buthundredsofmillionsofpeopleusetheirlefthands.Thenwhyaresomepeopleleft-handed?Scientistshavebeentryingtoanswerthatquestionformanyyears.Astudydonein1992foundthatmenaremorelikelytobeleft-handedthanwomen.Italsofo

4、undthatAsianorHispanicpeoplearelesslikelytobeleft-handedthanwhitepeople,blackpeople,orNorthAmericanIndians.Someculturesacceptpeoplewhodothingsmostlywiththeirlefthands.Othersdonot.Scientistswanttoknowthereasonforleft-handednessbecauseitiscloselylinkedtomentalproblem

5、sandlanguagedifficulties.Oneideaaboutthecauseofleft-handednessisthegenetictheory.Itsaysthatpeopleareright-orleft-handedbecauseofgenespassedtothembytheirparents.Forexample,ithasbeenshownthatthehandednessofadoptedchildrenismorelikelytofollowthatoftheirbirthparentstha

6、ntheiradoptedparents.Otherevidenceofgeneticinvolvementcanbefoundinsomefamilies.Onefamousexampleistheleft-handedmembersofthepresentBritishroyalfamily.TheseincludeQueenElizabethII,PrinceCharlesandPrinceWilliam.Anotherideaisthatright-handedpeoplearebornwiththegenefori

7、t.Butabout20%ofpeopledonothavetheright-handedgene.Thesepeoplecouldbeeitherleft-orright-handed.Thisideamayexplainwhytwobabieswhohavethesamegenesusedifferenthands.In18%ofidenticaltwinsonetwinisright-handed,andtheotherisleft-handed.Probablybothtwinslacktheright-handed

8、genesoeachhasachancetobeeitherright-orleft-handed.Somescientistsbelievethatthecauseofhandednesscouldincludebothgeneticsanddevelopment.Exercise1Li