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1、DictationScripts:Unit3ComputerSecurityPart1:Listening1.ChoosetheProperWordsorExpressionsListentoashortpassage.Pickouttheunderlinedwordsorexpressionswhicharetheclosesttowhatyouhaveheard.Let'sfacethefactshere,people.Theworldhasbecomeaprettyscaryplace.Inthesaladdaysofyouryouth,allyouhadtowor
2、ryaboutwasthehealth,well-beingofyourfamilyandlockingyourdoorsatnight.Notanymore.Today,youneedtoworryaboutsecurityinawholedifferentarena:YourPC.Spy-ware,adware,virusesandTrojansarelurkingonline,waitingtoinfestyourcomputer.AllcouldeasilycrippleyourPCifyou'renotcareful.Worseyet,hackerscoulds
3、tealimportantpersonalinformation.Ifthat'snotenoughtosendyouhidingunderthecovers,youalsohavetofindawaytokeepyourkidssafeonline.Scary?Youbet.Unmanageable?Notatall.Pullthecoversoffyouheadandlistentous.Oursupersecurityguidewillhelpyouwiseupandstaysafe.2.AnswertheQuestionsListentoashortpassage
4、.Tryyourbesttounderstandthelinesandanswerthefollowingquestions.Acomputervirusisacomputerprogramthatcancopyitselfandinfectacomputer.Theoriginalmaymodifythecopiesorthecopiesmaymodifythemselves.Aviruscanonlyspreadfromonecomputertoanotherwhenitshostistakentotheuninfectedcomputer,forinstanceby
5、ausersendingitoveranetworkorcarryingitonaremovablemediumsuchasafloppydisk,CD,USBdriveorbytheInternet.VirusesaresometimesconfusedwithcomputerwormsandTrojanhorses.Aworm,however,canspreaditselftoothercomputerswithoutneedingtobetransferredaspartofahost.ATrojanhorseisafilethatappearsharmlessun
6、tilexecuted.Incontrasttoviruses,Trojanhorsesdonotinserttheircodeintoothercomputerfiles.ManypersonalcomputersarenowconnectedtotheInternetandtolocalareanetworks,facilitatingthespreadofmaliciouscode.Today'svirusesmayalsotakeadvantageofnetworkDictationScripts:Unit3ComputerSecurityservicessuch
7、astheWorldWideWeb,e-mail,andfilesharingsystemstospread,blurringthelinebetweenvirusesandworms.Questions:1Whatisacomputervirus?2Howdoesacomputervirusspread?3Pleaselisttheremovablemediathatcancarrycomputerviruses.4Whatarethedifferencesbetweenacomputervirus,awormandaTro
