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. Thisselectioncanbestbetitled_____B____.
A.a.Measuring Your Intelligence B.b.Intelligence and Environment C.c.The Case of Peter and Mark D.d.How the brain Influences Intelligence正确答案B
