参考答案

正确答案：D
Inearly1994，whenMarkAndreessenwasjust23yearsold，hearrivedinSiliconValleywithanideathatwouldchangetheworld.(19)AsastudentattheUniversityofIllinois，heandhisfriendshaddevelopedaprogramcalledMosaic，whichallowedpeopletoshareinformationontheworldwideweb.BeforeMosaic，thewebhadbeenusedmainlybyscientistsandothertechnicalpeople，whowerehappyjusttosendandreceivetext.ButwithMosaic，Andreessenandhisfriendshaddevelopedaprogramwhichcouldsendimagesoverthewebaswell.Mosaicwasanovernightsuccess.Itwasputontheuniversity"snetworkatthebeginningof1993.Andbytheendoftheyear，ithadoveramillionusers.Soonafter，AndreessenwenttoseekhisfortuneinSiliconValley.(20)Oncehegotthere，hestartedtohavemeetingswithamancalledJimClark，whowasoneoftheValley"smostfamousentrepreneurs.In1994，nobodywasmakinganyrealmoneyfromtheInternetwhichwasstillveryslowandhardtouse.ButAndreessenhadseenanopportunitythatwouldmakehimandClarkrichwithintwoyears.HesuggestedtheyshouldcreateanewcomputerprogramthatwoulddothesamejobasMosaicbutwouldbemucheasiertouse.ClarklistenedcarefullytoPmdreessen，whoseideasandenthusiasmimpressedhimgreatly.(21)Eventually，Clarkagreedtoinvestthreemilliondollarsofhisownmoneyintheproject，andtoraiseanextrafifteenmillionfromventurecapitalistswhowerealwayskeentolistentoClark"snewideas.未听先知：预览三道题各选项，由第20题中的He可以推断，文章与某位男士的个人经历有关，该题选项中出现了computerscientists，computerbusiness等词，再结合第19题中的program，第21题中的technology，computerexpertise可以推测，文章可能围绕计算机行业中的某位男士展开。WathdowelearnaboutMosaic?D.。详解：四个选项均以It开头，意思分别为A.“它是Illinois大学提供的分享教学观点的平台”B.“它主要用于科学家和技术人员之间的文字信息传递”、C.“它刚开始时是一个很成功的软件，但没能持续很久”和D.“这一程序允许人们通过网络共享信息”，由此可以判断，It一定是某种技术形式，更有可能是某种软件或平台，本题考查内容与It的功能有关。短文一开始就提到，Mark和他的朋友开发了Mosaic，它可以允许人们通过网络在全世界范围内共享信息。