题目内容：
根据短文，回答题Revolutionaryinnovationisnowoccurringinallscientificandtechnologicalfields．Thiswaveofunprecedentedchangeisdrivenprimarilybyadvancesininformationtechnology。butitismuchlargerinscope．WearenotdealingsimplywithanInformationRevolutionbutwithaTechnologyRevolution．Toanticipatedevelopmentsinthisfield，theGeorgeWashingtonUniversityForecastofEmergingTechnologieswaslaunchedatthestartofthel990s．WehavenowcompletedfourroundsofourDelphisurvey—inl990，1992，1994，andl996一givingusawealthofdataandexperience．Wenowcanofferareasonablyclearpictureofwhatcanbeexpectedtohappenintechnologyoverthenextthreedecades．
Timehorizonsplayacrucialroleinforecastingtechnology．Forecastsofthenextfivetotenyearsareoftensopredictablethattheyfallintotherealmofmarketresearch。whilethosemorethan300r40yearsawayaremostlyspeculation．Thisleavesal0一to20一yearwindowinwhichtomakeusefulforecasts．ItisthistimeframethatourForecastaddresses．
TheForecastusesdiversemethods，includingenvironmentalscanning，trendanalysis，Delphisurveys，andmodelbuilding．Environmentalscanningisusedtoidentifyemergingtechnologies．Trendanalysisguidestheselectionofthemostimportanttechnologiesforfurtherstudy，andamodifiedDelphisurveyisusedtoobtainforecasts．InsteadofusingthetraditionalDelphimethodofprovidingrespondentswithimmediatefeed—backandrequestingadditionalestimatesinordertoarriveataconsensus．weconductanothersurveyafteranadditionaltimeperiodofabouttwoyears．
Fimlly，theresuItsareportrayedintimeperiodstobuildmodelsofunfoldingtechnologicalchange．Byusingmultiplemethodsinsteadofrelyingonasingleapproach，theForecastcanproducemorereliable，usefulestimates．
Forourlatestsurveyconductedinl996，weselected85emergingtechnologiesrepresentingthemostcrucialadvancesthatcanbeforeseenWethensubmittedthelistoftechnologiestoourpaneloffuturistsfortheirjudgmentsastowhen(orif)eachtechnologicaldevelopmentwouldenterthemainstream，theprobabilitythatitwouldhappen，andtheestimatedsizeoftheeconomicmarketforit．Inshort，wesoughtaforecastastowheneachemergingtechnologywillhaveactually“emerged”．
Whatwearefacedwithatpresentcanbebestdescribedasarevolutionin__________． A．information
B．advancedmethod
C．science
D．technology
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