宜城教育资源网www.ychedu.com免费Module 4-Languages of the World课件包（5份）含教学反思设计学案教案说课稿案例外研版选修9英语MODULE4LanguagesoftheWorldCultureCornerReadthepassageandanswerthequestions.1Whyarecomputervirusesdangerous?2Howdocomputervirusesspreadaroundtheworld?ReadThisCarefully-ComputerVirusesAreDangerous!Computers,theInternetandemailofferfantasticopportunitiesforglobalcommunication,butthiscommunicationisregularlythreatenedbycomputervirusesandworms.Avirusisacomputerprogrammethatentersacomputeranddamagesordestroysfilesandinformation.Bugsdamagecomputersandtypicallymakecopiesofthemselveswhicharesenttootherpeopleviaauser'saddressbook.InMarch1999,theMelissavirushitthebusinessworldbysendinganavalancheofemailmessagestocompanycomputers.Whenauseropenedanemailmessagecontaininganinfectedattachment,theviruswassenttothefirst50namesintheuser'saddressbook.Theemailfooledmanypeoplebecauseitappearedtocomefromsomeonetheyknew.Onthe26thApril1999,theChernobylvirusdisabledanestimatedquarterofamillionpersonalcomputersinSouthKoreaalone.April26thistheanniversaryoftheaccidentattheSovietnuclearpowerplantatChernobyl,whichhappenedin1986.Loveletterisawormthatappearedinthespringof2000.Theinfectionaffectedmillionsofcomputersandcausedmoredamagethananyothercomputervirushadeverdone.UserswereinfectedviaemailorthroughInternetchatrooms.Themailincludedafileattachment.Theemailsubjectboxhadthismessage:Eachyearbringsanewdanger.In2003,aviruscalledSoBig-Fmayhaveinfectedonein17ofallemailsaroundtheworldwithin48hoursofitscreation.SoBig-FisbelievedtohavestartedinAmericaandspreadquicklyto148countries.InformationanalystPaulWoodsaid:"Thespeedatwhichthesevirusestravel,andthedamagetheycausearefrightening.Andthenextviruscouldbeevenworse." 宜城教育资源网www.ychedu.com
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