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xx年大学英语四级阅读理解模拟试题xx年大学英语四级阅读理解模拟试题 There aretwo factorswhich determinean individualsin___igence.The firstis the sort ofbrain he is bornwith.Human brainsdiffer considerably,some beingmore capablethan others.But nomatter howgood abrain he has tobegin with,an individualwill havea loworder ofin___igence unlesshehasopportunities tolearn.So thesecond factoris whathappens tothe individual—thesortof environmentin which heisreared.If anindividual ishandicapped envionmentally,it islikely thathis brainwill failto developand hewill neverattain thelevel ofin___igence ofwhichheis capable. The importanceof environmentin determiningan individualsin___ingence canbe demonstratedby thecase historyof theidentical twins,Peter andMark X.Being identical,the twinshad identicalbrains atbirth,and theirgrowth processeswere thesame.When thetwins werethree monthsold,their parentsdied,and theywere placedin separatefoster...。