科技英语强化听力与口语 宋惠珍 成利 Unit 2

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1、Unit2TheInternet1.WhatistheInternet?isaglobalsystemofinterconnectedcomputernetworks.------Wikipedia维基百科2.WhatistheuseoftheInternet?FreetalkDiscussion:WhatdoyouoftendowiththeInternet?CommunicationInformationsearchingEntertainmentE-CommerceOtherservicesInternetsurfingTask1:Disc

2、oursereading(Discuss&Read)Analyzethepicture“ThisdiagramrepresentsawideareanetworkorWAN.”WAN---WideAreaNetwork广域网LAN---LocalAreaNetwork局域网3.HowdoestheInternetwork?TheDiscourse:Comparison（对比）&Contrast（对照）ThisdiagramrepresentsawideareanetworkorWAN.Twonetworksarelinkedviasatelli

3、te.OnenetworkisinBarcelonaandconsistsofacentralcomputerandvariousPCs.TheotherLANisinLosAngelesandcontainsacentralcomputerandseveralclients.InLosAngeles,thecomputersareconnectedtothetelephonelinesbyamodem.However,inBarcelona,thenetworkislinkedtofibre-opticcables.Thesatellitere

4、ceivessignalsfromthedishaerials.ThenthesignalsareretransmittedtoworkstationsinBarcelonaorLosAngeles.Thepurposeofthisintegratednetworkmaybetoestablishcommunicationsservicesonatranscontinentalscale.Itallowslargecompaniesandinstitutionstoexchangeinformationoverlongdistances.Disc

5、ussion:WhatdoyouoftendowiththeInternet?CommunicationInformationsearchingEntertainmentE-CommerceOtherservicesInternetsurfingAdvantagesoftheInternetAdvantagesandDisadvantagesoftheInternetAdvantagesDisadvantagesCommunicationInformationsearchingEntertainmentE-CommerceOtherservice

6、sTask2:ListeningcomprehensionA Warning AboutWirelessInternetWirelessFidelity无线保真[fi'deliti]3rd-generationThecommunicationsindustryiswarningcomputeruserstoguardagainstanewwaytostealprivateinformation.Theysaythiskindoftheftisincreasing.Thievesarelinkingtheircomputerswithotherco

7、mputersandstealinginformationthatcancosthonestcomputerusersagreatdealofmoney.Theyaredoingthisbyusingthemostmoderncomputercommunicationsmethod--Wi-Fi.Wi-Fiisashortwayofsayingwirelessfidelity.Wi-FipermitscomputeruserstolinkwiththeInternetcommunicationssystemwithoutusingwiresand

8、atelephone.A Warning About Wireless InternetOnemethodusedbythievesto