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题干：Ifyouweretoexaminethebirthcertificatesofeverysoccerplayerin2006’sWorldCuptournament,youwouldmostlikelyfindanoteworthyquirk：elitesoccerplayersaremorelikelytohavebeenbornintheearliermonthsoftheyearthaninthelatermonths.IfyouthenexaminedtheEuropeannationalyouthteamsthatfeedtheWorldCupandprofessionalranks,youwouldfindthisstrangephenomenontobeevenmorepronounced.Whatmightaccountforthisstrangephenomenon?Hereareafewguesses：a)certainastrologicalsignsconfersuperiorsoccerskills；b)winter-bornbabiestendtohavehigheroxygencapacitywhichincreasessoccerstamina；с)soccer-madparentsaremorelikelytoconceivechildreninspringtime,attheannualpeakofsoccermania；d)noneoftheabove.AndersEricsson,a58-year-oldpsychologyprofessoratFloridaStateUniversity,sayshebelievesstronglyin“noneoftheabove.”EricssongrewupinSweden,andstudiednuclearengineeringuntilherealizedhewouldhavemoreopportunitytoconducthisownresearchifheswitchedtopsychology.Hisfirstexperiment,nearly30yearsago,involvedmemory：trainingapersontohearandthenrepeatarandomseriesofnumbers.“Withthefirstsubject，afterabout20hoursoftraininghisdigitspanhadrisenfrom7to20,"Ericssonrecalls."Hekeptimproving,andafterabout200hoursoftraininghehadrisentoover80numbers.，，Thissuccess,coupledwithlaterresearchshowingthatmemoryitselfisnotgeneticallydetermined,ledEricssontoconcludethattheactofmemorizingismoreofacognitiveexercisethananintuitiveone.Inotherwords,whateverinborndifferencestwopeoplemayexhibitintheirabilitiestomemorize,thosedifferencesareswampedbyhowwelleachperson“encodes”theinformation.Andthebestwaytolearnhowtoencodeinformationmeaningfully,Ericssondetermined,wasaprocessknownasdeliberatepractice.Deliberatepracticeentailsmorethansimplyrepeatingatask.Rather,itinvolvessettingspecificgoals,obtainingimmediatefeedbackandconcentratingasmuchontechniqueasonoutcome.Ericssonandhiscolleagueshavethustakentostudyingexpertperformersinawiderangeofpursuits,includingsoccer.Theygatherallthedatatheycan,notjustperformancestatisticsandbiographicaldetailsbutalsotheresultsoftheirownlaboratoryexperimentswithhighachievers.Theirworkmakesaratherstartlingassertion；thetraitwecommonlycalltalentishighlyoverrated.Or,putanotherway，expertperformers-whetherinmemoryorsurgery,balletorcomputerprogramming-arenearlyalwaysmade,notborn.
题目：According to Ericsson，good memory_____.
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