(最新)必修二unit3_computers_(reading)精品课件

Unit3readingIamveryoldnow.IwasborninChina.Manypeopleusedmeforcalculatinginthepast,butnowIamabitlonelybecausetheydon’tlikemenow.DoyouknowwhoIam?abacusRiddles(谜语)Icanbeusedforcalculating.Besides,IcanalsobeusedforwatchingDVD,sendinge-mailandcommunicatingthroughtheInternet.However,IamnotaPC,becauseI’msmallenoughforyoutotakemewithyou.DoyouknowwhoIam?laptopPDAPersonalDigitalAssistantIamsosmallinsizethatIcanfitinyourhand.Iusuallyhaveasmallscreenusuallybiggerthanadigitalphone,butsmallerthanthesmallestlaptop,I’magreatwaytostoretelephonenumbers,accesstheInternet,makecalculations,andsoon.DoyouknowwhoIam?Iamverysmall.Icanbeusedforcalculating.InChina,alotofstudentsusemewhensolvingmathematicalproblems.DoyouknowwhoIam?calculatorIamverybig.Scientistsusemetosolvesomemathematicalproblems.hugecomputerDoyouknowwhoIam?robotI’mamachinethatworksautomatically.Icandodifferentkindsoftasks,especiallysuitablefordoingjobstooboring,difficult,ordangerousforhumanbeings.DoyouknowwhoIam?PCPersonalComputerI’masmall,relativelyinexpensivecomputerdesignedforanindividual(个人的)user.I’mbasedonthemicroprocessor(微处理器)technology.Athome,peopleusemetosurftheInternetandplaygames.DoyouknowwhoIam?PDAabacuscalculatorhugecomputerPClaptopWhat’snext?Canyoutellthedevelopmentofcomputers?robotartificialintelligenceWhatdotheyhaveincommon?1.Theycanbeusedforcalculating.2.Theycandealwithmathsproblems.3.Theyareourfriends.4.Theyareusefulandhelpful.Discussion2.Lookatthesepicturesandguesswhattheyare.acalculatingmachineanalyticalmachineuniversalmachinesolvedifficultmathematicalproblemscomputeraslargeasaroom3.Lookattheseinventions.Canyouputtheminanorderaccordingtothetimewhentheyappeared?Afterreadingthepassage,checktoseeifyouareright.()analyticalmachine()laptop()calculatingmachine()robot()PC()universalmachineReadingWHOAMI?1.Whoisthespeakerinthisstory?2.Findoutthetopicsentenceofeachparagraphandthemainideaofthispassage.A.Thedevelopmentofcomputers.B.Thedevelopmentanduseofcomputers.C.Amachinewhichissimple-minded.D.Computersmayreplacehumanbeings.3.Thetextiswrittenintheorderof.A.timeB.spaceC.logicD.alltheaboveAcomputer.FastreadingLookattheseinventions.Canyouputtheminanorderaccordingtothetimewhentheyappeared?Afterreadingthepassage,checktoseeifyouareright.()analyticalmachine()laptop()calculatingmachine()robot()PC()universalmachine123456While-reading(3):carefulreadingReadthepassageagaincarefullyandfinishEx.2onP19inthestudentbook.Para.1TopicsentenceSupportingdetails▪▪▪▪▪OvertimeIhavebeenchangedquitealot.calculatingmachineanalyticalmachineuniversalmachinePClaptop1.Whycouldtheanalyticalmachine“think”logicallyandproduceananswerquickerthananyperson?Becauseitwasprogrammedbyanoperatorwhousedcardswithholes.Para.2TopicsentenceSupportingdetails▪firststoredin__▪▪▪▪ThosechangesonlybecamepossibleasmymemoryimprovedtubestransistorschipsnetworkWorldWideWeb2.Itotallychangedmyshape,becausemymemorywasfirststoredintubes,thenontransistorsandlateronverysmallchips.Itotallychangedmyshape！(translation)Overtimemymemoryhasdevelopedsomuchthat,likeanelephant,IneverforgetanythingIhavebeentold.随着时间的推移，我的记忆力发展的如此之快，就像一头大象，我从来不会忘记告诉我的任何事情。Para.3TopicsentenceSupportingdetails▪▪▪▪▪▪▪▪Sincethe1970smanynewapplicationshavebeenfoundforme.communicationsfinancetraderobotsmobilephonesmedicaloperationsspacerocketsprovidealifeofhighquality3.Manynewapplicationshavebeenfoundforme,suchasincommuni-cation/finance/trade/robots/mobileRockets.Careful-reading:phones/medicaloperations/spaceDevelop-mentEarlydaysNameFunctionPoorStrongA_________machineSimplifydifficultsumsAn________machineThinklogicallyandproduceananswerquicklyA_________machineSolvedifficult______________________calculatinganalyticaluniversalmathematicalproblemsDevelop-mentNetworktimes_________storedinTubesLargeSmall____________Smallchips________________NarrowWideFinance________RobotsMobilephones___________SpacerocketsMedicaloperationsMemoryTransistorsApplicationsCommunicationTradetimeline1642:1822:1936:1940s:1960s:1970s:Thecomputerbeganasacalculatingmachine.TheAnalyticalMachinewasbuiltbyCharlesBabbage.Thecomputergrewrapidlybothinsizeandinbrainpower.Computerhadgrownaslargeasaroom.Computerswereusedinofficesandhomes.Thefirstfamilyofcomputerswasconnectedbyanetwork.Manynewapplicationshavebeenfoundforcomputers.Now:Computersconnectpeopleallovertheworldtogether.While-reading(2):(Universalmachine)TrueorFalse1.AlanTuringbuiltanAnalyticalMachinetosolveanymathematicalproblems.2.Peoplebegantorealizethatthecomputergotclevererandquickerwithtimepassing.3.Thecomputerbegantoservethehumanracesinceitwasbroughtintopeople’shomes.4.Sincethe1970s,thecomputerwasusedbypeoplearoundtheworldthroughtheInternet.5.Thelargerthecomputeris,themorememoryithas.FTFTFHowcomputershavechangedourlives?Brainstormalistofthingsthatyou,yourschoolandyourfamilyusecomputerfor.Discussion:Post-reading:pair-workAdvantageslistentothemusicwatchnews/moviescommunicatewithfriendsbuythingsonlinesearchforinformationstoreinformationwordprocessingDisadvantages•playcomputergamestoomuch•chat（聊天）ontheInternettoomuch•littletimetostudy