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Therearetwofactorswhichdetermineanindividual'sintelligence.Thefirstisthesortofbrainheisbornwith.Humanbrainsdifferconsiderably,somebeingmorecapablethanothers.Butnomatterhowgoodabrainhehastobeginwith,anindividualwillhavealoworderofintelligenceunlesshehasopportunitiestolearn.Sothesecondfactoriswhathappenstotheindividual—thesortofenvironmentinwhichheisreared.Ifanindividualishandicappedenvionmentally,itislikelythathisbrainwillfailtodevelopandhewillneverattainthelevelofintelligenceofwhichheiscapable.
Theimportanceofenvironmentindetermininganindividual'sintellingencecanbedemonstratedbythecasehistoryoftheidenticaltwins,PeterandMarkX.Beingidentical,thetwinshadidenticalbrainsatbirth,andtheirgrowthprocesseswerethesame.Whenthetwinswerethreemonthsold,theirparentsdied,andtheywereplacedinseparatefosterhomes.Peterwasreatedbyparentsoflowintelligenceinanisolatedcommunitywithpooreducationalpooprtunities.Markwasrearedinthehomeofwell-to-doparentswhohadbeentocollege.Hewasreadtoasachild,senttogoodschools,andgiveneveryopportunitytobestimulatedintellectually.Thisenviromentaldifferencecontinueduntilthetwinswereintheirlateteens,whentheyweregibentesetstomeasuretheirintelligence.Mark'sI.Q.was125,twenty-fivepointshigherthantheaverageandfullyfortypointshigherthanhisidenticalbrother.Givenequalopportunities,thetwins,havingidenticalbrains,wouldhavetestedatroughlythesamelevel.
1.Thisselectioncanbestbetitled_________.
a.MeasuringYourIntelligence
b.IntelligenceandEnvironment
d.HowthebrainInfluencesIntelligence
2.Thebeststatementofthemainideaofthispassageisthat_____.
a.humanbrainsdifferconsiderably
b.thebrainapersonisbornwithisimprotantindetermininghisintelligence
c.environmentiscrucialindeterminingaperson'sintelligence
d.personshavingidenticalbrainswillhaveroughlythesameintelligence
3.Accordingtothepassage,theaverageI.Q.is_____.
4.Thecasehistoryofthetwinsappearstosupporttheconclusionthat_______.
a.individualwithidenticalbrainsseldomtestatsamelevel
b.anindividual'sintelligenceisdeterminedonlybyhisenviroment
c.lackofopportunityblocksthegrowthofintelligence
d.changesofenviromentproducechangesinthestructureofthebrain
5.Thispassagesuggeststhatanindividual'sI.Q.______.
b.staysthesamethrouthouthislife
c.canbeincreasedbyeducation
d.isdeterminedbyhischildhood
bcbcc
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