题目内容：
根据以下材料，回答题E-mailorelectronicmail,isconsideredasthemodemcommunicationinthenewage.Itiscarriedoutincomputersallovertheworldbymillionsofusers.Inthisinvisibleworldasmanypeo-plecallit,
theuserscansendandreceiveletterstoandfromeverycorneroftheearth.Theysharethoughtswithpenpals(笔友)inNewZealand,askstrangersinBombay(孟买)questions,
debatewithbusinessmaninManhattan.Allofthesearejusthappeningincomputersasfastasthetravellingofthelight,nowritingandspeaking,nopaperandstampsarenecessary.
E-mailisapipelinetothousandsofexpertsoneverything;itisameansofmeetingpeoplewithsimilarinterestsorproblems.Butitisnotalivetalk--arealconversationlikethoseintelephones.
E-mailerscomposelettersatleisureontheircomputers,thensendthembyphonelinetoanon-lineservice,andthentheygoforwardtotherightplace.Aresponsecanbebackwithinhours,dependingonhowoftentherecipient(接受者）chouhein.
Avastglobalnetworksofon-lineservicesforE-mailhasbeenbuilt.AlotofpeopleareregularlyusingthisserviceintheUSA.PeoplebelievethatE-mail,thecomputerizedexchange,wouldcreatefriendshipandbusinessdevelopments,andwouldchangepeople'slifeintheworld.
WhichofthefollowingexpressionisnotforE-mail? A．Communicationinnewage.
B．Invisibleworld.
C．Alivetalk.
D．Computerizedexchange.
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答案解析：