题目内容：
根据以下材料回答题 Inthe1950s,thepioneersofartificialintelligence(A．I)predictedthat,bytheendofthiscen-tury,computerswouldbeconversingwithusatworkandrobotswouldbeperformingourhouse-work．Butasusefulascomputersare,they'renowhereclosetoachievinganythingremotelyresem-blingtheseearlyaspirationsforhumanlikebehavior．Nevermindsomethingascomplexasconver-sation:themostpowerfulcomputersstruggletoreliablyrecognizetheshapeofanobject,themostelementaryoftasksforaten-month-oldkid．
AgrowinggroupofAIresearchersthinktheyknowwherethefieldwentwrong．Theprob-lem,thescientistssay,isthatAIhasbeentryingtoseparatethehighest,mostabstractlevelsofthought,likelanguageandmathematics,andtoduplicatethemwithlogical,step-by-steppro-grams．AnewmovementinAI,ontheotherhand,takesacloserlookatthemoreroundaboutwayinwhichnaturallycameupwithintelligence．Manyoftheseresearchersstudyevolutionandnaturaladaptationinsteadofformallogicandconventionalcomputerprograms．Ratherthandigitalcomput-ersandtransistors,somewanttoworkwithbrainceilsandproteins．TheresuitSoftheseearlyef-fortsareaspromisingastheyarepeculiar,andthenewnature-basedAImovementisslowlybutsurelymovingtotheforefrontofthefield．
Imitatingthebrain'sneural(神经的)networkisahugestepintherightdirection,sayscom-puterscientistandbiophysicistMichaelConrad,butitstillmissesanimportantaspectofnaturalin-telligence．"Peopletendtotreatthebrainasifitweremadeupofcolor-codedtransistors",heex-plains,"butit'snotsimplyaclevernetworkofswitches．Therearelotsofimportantthingsgoingoninsidethebraincellsthemselves．"Specifically,Conradbelievesthatmanyofthebrain'scapa-bilitiesstemfromthepatternrecognitionproficiencyoftheindividualmoleculesthatmakeupeachbraincell．Thebestwaytobuildandartificiallyintelligentdevice,heclaims,wouldbetobuilditaroundthesamesortofmolecularskills．
Rightnow,theoptionthatconventionalcomputersandsoftwarearefundamentallyincapableofmatchingtheprocessesthattakeplaceinthebrainremainscontroversial．Butifitprovestrue,thentheeffortsofConradandhisfellowAIrebelscouldturnouttobetheonlygameintown．
Theauthorsaysthatthepowerfulcomputersoftoday A．arecapableofreliablyrecognizingtheshapeofanobject．
B．areclosetoexhibitinghumanlikebehavior．
C．arenotverydifferentintheirperformancefromthoseofthe50's．
D．stillcannotcommunicatewithpeopleinahumanlanguage．
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