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Unit3ComputersWHOAMI?ReadingHowtofindthetopicsentence?Exposition说明文Topicsentencethinking?Howtofindit?Whatistopicsentence?OvertimeIhavebeenchangedquitealot1642Thecomputerbeganasacalculatingmachine.1822TheanalyticalmachinewasmadebyCharlesBabbage.1936AlanTuring’suniversalmachine1940sThecomputerhadgrownaslargeasaroom1960sFamilyofcomputerswasconnectedtoeachother.1970sPC&laptopwereusedinofficesandhomes.NowComputersconnectpeopleallovertheworldtogether.transistorschipsnetworkWorldWideWebThesechangesonlybecamepossibleasmymemoryimprovedtubes•Ihaveamemorylikeanelephant.•=Ihaveagoodmemoryandwillneverforgetthings.APPSincethe1970smanynewapplicationshavebeenfoundformecommunicationtrademedicaloperationsspacerocketsmobilephonerobotsFinanceAPPSupportingdetailscalculatingmachineanalyticalmachineuniversalmachinePClaptopmemorytubestransistorschipsnetwork•1.OvertimeIhavebeenchangedquitealot.•2.Thesechangesonlybecamepossibleasmymemoryimproved.•3.Sincethe1970smanynewapplicationshavebeenfoundforme.historydevelopmentusesmainideaofthetextThistexttoldusthe_______andthe______________ofcomputers,mainlytoexpressitswidely_______.TopicsentenceMainideahistorydevelopmentusesExercisestimeHomeworkReadingmaterialFindoutthetopicsentenceforeachparagraph.Writedownthemainideaofthetext.