题目内容：
Questionsarebasedonthefollowingpassage:
Inwhatnowseemsliketheprehistorictimesofcomputerhistory,theearlypost-warera(战后时期),therewasaquitewidespreadconcernthatcomputerswouldtakeovertheworldfrommanoneday．
Alreadytoday,lessthanfortyyearslater,ascomputersarerelievingusofmoreandmoreoftheroutinetasksinbusinessandinourpersonallives,wearefacingwithalessdramaticbutalsolessforeseenproblem．Peopletendtobeover-trusting(过分信任)ofcomputersandarereluctanttochallengetheirauthority．Indeed,theybehaveasiftheywerehardlyawarethatwrongbuttonsmaybepushed,orthatacomputermaysimplymalfunction(失灵)．
Obviously,therewouldbenopointininvesting(投入)inacomputerifyouhadtocheckallitsanswers,butpeopleshouldalsorelyontheirowninternalcomputersandcheckthemachinewhentheyhavethefeelingthatsomethinghasgonewrong．Questioningandroutinedoublechecksmustcontinuetobeasmuchapartofgoodbusinessastheywereinpre-computerdays．Maybeeachcomputershouldcomewiththefollowingwarning:forallthehelpthiscomputermayprovide,itshouldnotbeseenasasubstitutefoifundamentalthinkingandreasoningskills．
Whatisthemainpurposeofthispassage? A．Tolookbacktotheearlydaysofcomputers
B．Toexplainwhattechnicalproblemsmayoccurwithcomputers
C．Todiscourageunnecessaryinvestmentincomputers
D．Towarnagainsttheblindnesstotheprobableshortcomingsofcomputers
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答案解析：