Thehumanbraincontains10thousandmillioncells(细胞）andeachofthesemayhaveathousandconnections.Suchgreatnumbersusedtodiscourageusandcauseustostopthinkingaboutthepossibilityofmakingamachinewithhumanlike

　　   Thehumanbraincontains10thousandmillioncells(细胞）andeachofthesemayhaveathousandconnections.Suchgreatnumbersusedtodiscourageusandcauseustostopthinkingaboutthepossibilityofmakingamachinewithhumanlikeabilitybutnowthatwehavegrownusedtomovingforwardatsuchaspeedwecanbelesssure.Quitesooninonly10or20yearsperhapswewillbeabletobuildamachineascomplex（复杂）asthehumanbrainandifwecanwewill.Itmaythentakeusalongtimetomakeitasintelligentasthehumanbrainbyproperlyprogrammingit.

　　  Ithinkitiscertainthatindecadesnotcenturiesmachinesofsilicon(硅)willarisetocompetewiththeirhumanancestors.Inarealsensetheywillbeabletoreproducethemselves.Siliconwillhaveendedcarbon'slongcontrol.Andwewillnolongerbeabletoconsiderourselvestobethefinestintelligenceintheworld.

　　   Astheintelligenceofrobotsincreasesandtheircostgoesdownwemayachievealotwiththeirhelpfirstontheearththroughtheirabilitytocompleteanykindofworkinharmfulenvironments.Intheenddeserts(沙漠)mayturn intogardens.Furtheraheadbyacombinationof;thegreatwealththisnewagewillbringandthetechpologyitwillprovidethecreationofahugeman-madeworldinspacehometothousandsormillionsofpeoplewillbewithinourpower.

　　33.Intheauthor'sopinionthehumanbrain____

　　   A.iscomplexandintelligent

　　   B.istoocomplextobereproduced

　　   C.maychangealotin10or20years

　　   D.willsoonbereplacedbymachines

　　34.Theunderlinedword“carbon”inParagraph2standsfor____.

　　   A.humanbeings

　　   B.anoldmachine

　　   C.anoceananimal

　　   D.intelligentrobots

　　35.Inthelastparagraphtheauthormainly____.

　　   A.talksabouttheintelligenceofrobots

　　   B.explainshowtocreateaworldinspace

　　   C.describeswhatourfuturelifemightbe

　　   D.showshisworryabouttheenvironment