计算机英语(第二版)chapter13-Internet课件

ComputerScienceinEnglishDesignedandProgrammedByJiangTongqiangMiaoTianshunTeachingAssistedCoursewareComputerScienceinEnglishDesComputerScienceinEnglishII.GrammaticalNotestotheTextIII.WordsBanktotheTextIV.ExercisesoftheChapterI.Pre-readingQuestionsChapter13InternetII.GrammaticalNotestotheTextIII.WordsBanktotheTextIV.ExercisesoftheChapterI.Pre-readingQuestionsComputerScienceinEnglishII.Chapter13I.Pre-readingQuestions1.WhataredomainandDNS?2.HowmanyservicesareprovidedbytheInternet?Nameeachofthem.3.IdentifytwowaysaccessingtoInternet,andexplainthedifferencesbetweenthem.1.WhataredomainandDNS?ReferenceKey: Domainnamestellthecomputerwheretolookfortheserverofthewebsite.Domainnamescanrefertospecificcomputers,organizations,companies,orotherentities.Eachdomainisnamedbythewayupwardfromittothe(unnamed)root. TheessenceofDNS(DomainNameSystem)istheinventionofahierarchical,domain-basednamingschemeandadistributeddatabasesystemforimplementingthisnamingscheme.Itisprimarilyusedformappinghostnamesande-maildestinationstoIPaddressesbutcanalsobeusedforotherpurposes.DNSisdefinedinRFCs1034and1035.Chapter13I.Pre-readingQuestChapter13I.Pre-readingQuestions2.HowmanyservicesareprovidedbytheInternet?Nameeachofthem.ReferenceKey:WWW(WorldWideWeb),E-mail,FTP(FileTransferProtocol),TelnetChapter13I.Pre-readingQuestChapter13I.Pre-readingQuestions3.IdentifytwowaysaccessingtoInternet,andexplainthedifferencesbetweenthem.ReferenceKey:Referstoconnectingadevicetoanetworkviaamodemandapublictelephonenetwork,dial-upaccessisreallyjustlikeaphoneconnection,exceptthatthepartiesatthetwoendsarecomputerdevicesratherthanpeople.Becausedial-upaccessusesnormaltelephonelines,thequalityoftheconnectionisnotalwaysgoodanddataratesarelimited.Inthepast,themaximumdataratewithdial-upaccesswasonly56Kbps(56000bitspersecond).Chapter13I.Pre-readingQuestChapter13I.Pre-readingQuestions3.IdentifytwowaysaccessingtoInternet,andexplainthedifferencesbetweenthem. DigitalSubscriberLine,orDSL,isamethodofaccessingtheinternetviatelephonelines.Itdiffersfromdial-upaccessinthatitmakesuseofaspecialfrequencyspectrumwhichallowsbothdigitalinformationandtelephoneservicestorunthroughthesamecable.Itisalsoagooddealfasterthandial-upInternet,theoreticallyprocessingupwardsof10megabitspersecond,incontrasttodial-up’ssluggish56kilobits(orroughlyfivepercentofamegabit).InfactsuchextremelyfastspeedsarerarelyobtainedbyDSLservicesbecausemostphonecompaniesinstallartificial“speedcaps”toimposeauniversallevelofserviceontheirlines.However,evenaslower-pacedDSLconnectioncanmakeforeasyandresponsivewebnavigation.Chapter13I.Pre-readingQuest本句是一个并列句。连词and连接两个句子：Anetworkisacollectionofcomputers和theInternetisanetworkofnetworks。句中的that引导定语从句修饰computers，连接副词so引导状语从句，表示thatareconnectedtogether的目的。1.Anetworkisacollectionofcomputersthatareconnectedtogethersotheycanshareinformation,andtheInternetisanetworkofnetworks.II.GrammaticalNotestotheText本句是一个并列句。连词and连接两个句子：Anetwork句首的不定式tomakeiteasier做目的状语，其中的it是形式宾语，其内容由不定式forsbtoremember表达出来。主句的谓语有短语beexpressed…as(被表述为)。句末的above是形容词，作后置定语，修饰介词短语liketheone中的代词one。2.Tomakeiteasierforushumanstoremember,IPaddressesarenormallyexpressedindecimalformatasa“dotteddecimalnumber”liketheoneabove.II.GrammaticalNotestotheText句首的不定式tomakeiteasier做目的状语，其该句第一个which引导的非限制性定语从句修饰alocalDNSserver。第二个which引导的非限制性定语从句则修饰theresolver。3.TheresolversendsaUDPpackertoalocalDNSserver,whichthenlooksupthenameandreturnstheIPaddresstotheresolver,whichthenreturnsittothecaller.II.GrammaticalNotestotheText该句第一个which引导的非限制性定语从句修饰alocalafterestablishingtheTCPconnectiontoport25为该句的时间状语，相当于一个由after引导的时间状语从句。现在分词短语operatingastheclient修饰thesendingmachine,operatingastheserver则修饰thereceivingmachine。4.AfterestablishingtheTCPconnectiontoport25,thesendingmachine,operatingastheclient,waitsforthereceivingmachine,operatingastheserver,totalkfirst.II.GrammaticalNotestotheTextafterestablishingtheTCPcon限制性定语从句thatsupportstheInternet修饰该句主语thesoftware。限制性定语从句uponwhicheverythingelse修饰technicalservices。5.ThesoftwarethatsupportstheInternetprovidesalargenumberoftechnicalservicesuponwhicheverythingelseisbuilt.II.GrammaticalNotestotheText限制性定语从句thatsupportstheInter现在分词结构作状语，表结果。限制性定语从句doneedtotalkabout修饰fourimportantInternetservices，其中在实义动词need前加上助动词do表示强调，强调动作talkabout。6.Nevertheless,therearefourimportantInternetserviceswedoneedtotalkabout.II.GrammaticalNotestotheText现在分词结构作状语，表结果。6.Nevertheless,本句中的which引导非限定性定语从句，修饰mailbox。连接副词until引导的状语从句表示时间。7.There,itwillbestoredintherecipient’s“mailbox,”whichisdeterminedbyhisorherusername,untilheorshepicksitup.II.GrammaticalNotestotheText本句中的which引导非限定性定语从句，修饰mailbox。本句的主体结构如下：theproblemisthat。句中第一个that是代词，做表语，其后的theyamplifytheentiresignal是表语的同位语，表示that的内容。第二个that引导的定语从句theyreceive，修饰signal。8.Theproblemwithrepeatersisthattheyamplifytheentiresignalthattheyreceive,includinganylinenoise.II.GrammaticalNotestotheText本句的主体结构如下：theproblemisthat。本句是一个强调句型：Itis…that…。介词短语bylearningwhichMACaddressesareliveonthenetwork是该句的强调成分，充当句中的状语。which引导的从句作动词learn的宾语(从句)。该句的主体结构可变换成：thebridgeisabletocontroltrafficandkeepitfromspreading。其中isableto和keep作为该句的并列谓语。句中的第二个和第三个that分别引导定语从句修饰traffic和segment。9.ItisbylearningwhichMACaddressesareliveonthenetworkthatthebridgeisabletocontroltrafficthatislocaltoaparticularsegmentandkeepitfromspreadingtoothernetworksegmentsthatarebeingservicedbyanotherbridgeswitch.II.GrammaticalNotestotheText本句是一个强调句型：Itis…that…。介词短语b该句是个复合句，主句是itdiffers。连接副词inthat引导出状语从句itmakesuseofaspecialfrequencyspectrum。连词which引导定语从句修饰hat意思是“由于，因为”。10.Itdiffersfromdial-upaccessinthatitmakesuseofaspecialfrequencyspectrumwhichallowsbothdigitalinformationandtelephoneservicestorunthroughthesamecable.II.GrammaticalNotestotheText该句是个复合句，主句是itdiffers。连接副词intadminister[Ed5ministE]v.管理，执行influential[7influ5enFEl]adj.有影响的，有势力的unique[ju:5ni:k]adj.唯一的，独特的respectively[ri5spektivli]adv.分别地，各个地octet[Ck5tet]n.八位位组,八位字节(=byte)troubleshooting[5trQbl5Fu:tiN]n.问题解答identifier[ai

5dentifaiE]n.标识符uniform[5ju:nifC:m]adj.统一的，一致的insensitive[in5sensitiv]adj.感觉迟钝的undeliverable[5Qndi5livErEbl]adj.无法送达的trigger[5tri^E]vt.引起，触发beneficial[beni5fiFEl]adj.有益的，受益的III.WordsBanktotheTextadminister[Ed5ministE]v.管理，axon[5AksCn]n.轴突nutshell[5nQtFel]n.坚果壳regenerate[ri5dVenErit]vt.使新生，重建integrity[in5te^riti]n.完整，完整性amplify[5Amplifai]vt.放大，增强discernable[di`s\:nEbl]adj.可辨别的，可认识的twist[twist]v.扭曲，缠绕outgrow[aut5^rEu]vt.过大而不适于conserve[kEn5sE:v]vt.保存，保藏overwhelming[7EuvE5welmiN]adj.压倒性的dedicated[5dedikeitid]adj.专用的filtration[fil5treiFEn]n.过滤，筛选III.WordsBanktotheTextaxon[5AksCn]n.轴突III.WordsIV.ExercisesComprehensionFilling

BlanksVocabularyTrueorFalseMatchingTermsSummaryCloze(SummarizingtheText)TranslatingSentencesCollocationAnsweringQuestionsSelectingWordsConceptualPhrasesTranslationIV.ExercisesComprehensionFil1.Internetisaworldwide_________andinterconnectedcomputernetwork.2.DNSisprimarilyusedformappinghostnamesande-maildestinationsto______.3.OntheInternet,thewordaddressalwaysreferstoan________address,notapostaladdress.1.Opening2.IPaddresses3.electronic

IV.Exercises—ComprehensionI.Fillinthefollowingblanks.1.Internetisaworldwide___4.SMTPisasimple________protocol.5.______isthestandardWebtransferprotocol.4.ASCII 5.HTTPIV.Exercises—ComprehensionI.Fillinthefollowingblanks.4.SMTPisasimple________p1.TheHTTPprotocolconsistsoftwofairlydistinctitems.2.SMTPisasimpleASCIIprotocol.3.TelnetisanInternetstandardthatallowsyoutoconnecttoanothercomputer(host)ontheInternetandtologontothatcomputerasifyouwereonaterminalinthenextroom.4.DigitalSubscriberLinediffersfromdial-upaccessinthatitmakesuseofaspecialfrequencyspectrumwhichallowsbothdigitalinformationandtelephoneservicestorunthroughthesamecable.5.Therouterusedincomputernetworkingisaninternetworkingdeviceusedtohelpconservethebandwidthonthenetwork. 1.T 2.T 3.T 4.T 5.F IV.Exercises—ComprehensionII.TrueorFalse.1.T2.T 3.T4.T5.F1.TheHTTPprotocolconsists(A)hub (B)switch (C)routerIV.Exercises—ComprehensionIII.Matchingtheterms.

_______AninternetworkdevicethatorganizesyourcablesandrelaydatasignalstoallcomputersthatexitstonyourLAN._______Aninternetworkdevicethatusedtomanagebandwidthonalargenetwork.ItcontrolshowdataflowsbyusingtheMACaddressesthatareplacedoneachdatapacket._______Aninternetworkdevicethatconnectstotwoormorenetworksatcrossingpoints,decideswhichwaythepacketshouldsendto,andensurethatthepacketgetstoitsdestinationquicklyandefficiently.1.A2.B 3.C(A)hub (B)switch (C)rout(1)WhatistheInternet?IV.Exercises—ComprehensionIV.Answerthefollowingquestions.

(1)TheInternetisanetworkofnetworks.Itletsindividualsononenetworksharetheinformationwithusersonanothernetworkthatmaybethousandsmilesaway;(1)WhatistheInternet?IV.(2)WhataretheusesoftheInternet?IV.Exercises—ComprehensionIV.Answerthefollowingquestions.

(2)TheInternethasmanyuses.Forinstance,youcanuseittosende-mailmessages,ortodownloadfiles,ortovievideoclips,ortolistentomusic.(2)WhataretheusesoftheI(3)WhatarefourimportantservicesprovidedbytheInternet?IV.Exercises—ComprehensionIV.Answerthefollowingquestions.

(3)FourimportantservicesprovidedbytheInternet:themailservice,telnet,FTP,andthegeneralclient/severfacility.(3)Whatarefourimportantse(4)WhatistheessenceofDNS?IV.Exercises—ComprehensionIV.Answerthefollowingquestions.

(4)TheessenceofDNSistheinventionofahierarchical,domain–basednamingschemeandadistributeddatabasesystemforimplementingthisnamingscheme.ItisprimarilyusedformappinghostnamesandemaildestinationstoIPaddressesbutcanalsobeusedforotherpurposes.(4)WhatistheessenceofDNSV.Fillintheblankswiththewordsgivenbelow.Changetheformwherenecessary.IV.Exercises—Vocabularyintegrityrespectivelyconserveamplifyboostuniformcomprehendinfiniteinfluential1.Goodcommunicationskillhelpshimtohavefriends. influentialV.FillintheblankswiththeV.Fillintheblankswiththewordsgivenbelow.Changetheformwherenecessary.IV.Exercises—Vocabularyintegrityrespectivelyconserveamplifyboostuniformcomprehendinfiniteinfluential2.Theyeachexcelintheir_________fields. respectiveV.FillintheblankswiththeV.Fillintheblankswiththewordsgivenbelow.Changetheformwherenecessary.IV.Exercises—Vocabularyintegrityrespectivelyconserveamplifyboostuniformcomprehendinfiniteinfluential3.Allflowingwater,thoughitappearstobe_________,isactuallydividedintoextensiveinnersurfaces,orlayers,movingagainstoneanother. uniformV.FillintheblankswiththeV.Fillintheblankswiththewordsgivenbelow.Changetheformwherenecessary.IV.Exercises—Vocabularyintegrityrespectivelyconserveamplifyboostuniformcomprehendinfiniteinfluential4.Separatistmovementsareathreattothe_________ofthenation. integrityV.FillintheblankswiththeV.Fillintheblankswiththewordsgivenbelow.Changetheformwherenecessary.IV.Exercises—Vocabularyintegrityrespectivelyconserveamplifyboostuniformcomprehendinfiniteinfluential5.Themoveisdesignedto_________salesduringthepeakbookingmonthsofJanuaryandFebruary. boostV.FillintheblankswiththeV.Fillintheblankswiththewordsgivenbelow.Changetheformwherenecessary.IV.Exercises—Vocabularyintegrityrespectivelyconserveamplifyboostuniformcomprehendinfiniteinfluential6.Heranxietyabouttheworldwas_________herpersonalfearsaboutherfuture. amplifyingV.FillintheblankswiththeV.Fillintheblankswiththewordsgivenbelow.Changetheformwherenecessary.IV.Exercises—Vocabularyintegrityrespectivelyconserveamplifyboostuniformcomprehendinfiniteinfluential7.Therepublic'sfactorieshaveclosedfortheweekendto_________energy. conserveV.FillintheblankswiththeV.Fillintheblankswiththewordsgivenbelow.Changetheformwherenecessary.IV.Exercises—Vocabularyintegrityrespectivelyconserveamplifyboostuniformcomprehendinfiniteinfluential8.Icannot_________howyoucouldhavebeensostupid. comprehendV.FillintheblankswiththeIV.Exercises—Collocation

V.Lookatthefollowingsentencetakenfromyourreadingpassage.Justthinkaboutwhatelseyoucan“identify”andfillinthesentenceswiththerightwords.e.g.IPaddresseswithafirstoctetfrom1to126arepartofthisclass.Theotherthreeoctetsareusedtoidentifyeachhost.IV.Exercises—CollocationVIV.Exercises—Collocation2.Havingidentifiedthepr______,thequestionarisesofhowtoovercomeit.oblem

1.Scientistsclaimtohaveidentifiedch______producedbycertainplantswhichhavepowerfulcancer-combatingproperties.emicalsIV.Exercises—Collocation2.IV.Exercises—Collocation4.Theyoungmantriedtoidentifyherpe________.rfume

3.Canyouidentifyyourum_________amongthislot?brellaIV.Exercises—Collocation4.IV.Exercises—Collocation6.Thelocalpoliceauthoritieshavealreadyidentifiedaround10murdersu______.spects

5.Hewasconfidentenoughtoidentifybe________withgoodness.autyIV.Exercises—Collocation6.IV.Exercises—SummaryVII.Choosethebestoneofthefouranswersgiventofillineachblank.Internetisaworldwideandopeninginterconnectedcomputernetwork.Itisaspecialnetwork,1whichuserscanadministerthemselves.InternetisbasedonTCP/IP2.Itcanprovidevariousinformationresourcesandmanynetworkservicesfornetwork3.IV.Exercises—SummaryVII.ChIV.Exercises—SummaryIntranetisthegeneric4foracollectionofprivatecomputernetworkswithinanorganization.Anintranetusesnetworktechnologiesasatooltofacilitatecommunication5peopleorworkgroupstoimprovethedata6capabilityandoverallknowledgebaseofanorganization’semployees.IV.Exercises—SummaryIntraneIV.Exercises—Summary AnExtranetisactuallyanIntranetthatispartially7toauthorizedoutsiders.Intranetnetworkisconnectedtothe8,ifitallowsaccess9theInternet,willbeanExtranet.Theactualserverwillresidebehindafirewall.ThefirewallhelpstocontrolaccessbetweentheIntranetandInternet10accesstotheIntranetonlytopeoplewhoaresuitablyauthorized.IV.Exercises—Summary AnExtIV.Exercises—Summary1.A.on B.in C.for D.with2.A.agreement B.serial C.task D.protocol3.A.customers B.consumers C.computers D.users4.A.word B.concept C.term D.name5.A.among B.between C.in D.at6.A.share B.sharing C.shared D.toshare7.A.accessible B.access C.accessibly D.assess8.A.intranet B.extranet C.internet D.wannet9.A.from B.into C.to D.by10.A.topermit B.permit C.permitted D.permitting1. A 2. D 3. D 4. C 5. B6. B 7. A 8. C 9. A 10. DIV.Exercises—Summary1.A.o1.TheARPAnetwasdesignedsothatevenifpartofitsphysicalstructureweredestroyed,informationcouldstillbesenttoanyremainingdestination.ARPAnet网络设计的目的是，即使网络的某一具体部分遭到破坏，信息仍能够传递到任一个残存的目标点。VIII.TranslatethefollowingintoEnglish.IV.Exercises—Translation1.TheARPAnetwasdesignedso2.TomapanameontoanIPaddress,anapplicationprogramcallsalibraryprocedurecalledtheresolver,passingitthenameasaparameter.为了把一个名字映射为一个IP地址，应用程序调用一种名叫解析器(resolver)的库过程，参数为名字。VIII.TranslatethefollowingintoEnglish.IV.Exercises—Translation2.TomapanameontoanIPad3.WithintheInternet,e-mailisdeliveredbyhavingthesourcemachineestablishaTCPconnectiontoport25ofthedestinationmachine.在因特网中，通过在源机器和目的机器的第25号端口之间建立TCP连接来传递电子邮件。VIII.TranslatethefollowingintoEnglish.IV.Exercises—Translation3.WithintheInternet,e-mail4.Anintranetusesnetworktechnologiesasatooltofacilitatecommunicationbetweenpeopleorworkgroupstoimprovethedatasharingcapabilityandoverallknowledgebaseofanorganization’semployees.企业内部把网络技术作为一种工具方便了人或工作组的沟通，以提高数据共享能力，以及一个组织雇员的整体知识基础。VIII.TranslatethefollowingintoEnglish.IV.Exercises—Translation4.Anintranetusesnetworkte5.Anorganization’sintranettypicallyincludesInternetaccessbutisfirewalledsothatitscomputerscannotbereacheddirectlyfromtheoutside.一个机构的内部网常常与互联网连接，但是被防火墙隔断，目的是阻断外部直接访问内部电脑。EndVIII.TranslatethefollowingintoEnglish.IV.Exercises—Translation5.Anorganization’sintranetComputerScienceinEnglishDesignedandProgrammedByJiangTongqiangMiaoTianshunTeachingAssistedCoursewareComputerScienceinEnglishDesComputerScienceinEnglishII.GrammaticalNotestotheTextIII.WordsBanktotheTextIV.ExercisesoftheChapterI.Pre-readingQuestionsChapter13InternetII.GrammaticalNotestotheTextIII.WordsBanktotheTextIV.ExercisesoftheChapterI.Pre-readingQuestionsComputerScienceinEnglishII.Chapter13I.Pre-readingQuestions1.WhataredomainandDNS?2.HowmanyservicesareprovidedbytheInternet?Nameeachofthem.3.IdentifytwowaysaccessingtoInternet,andexplainthedifferencesbetweenthem.1.WhataredomainandDNS?ReferenceKey: Domainnamestellthecomputerwheretolookfortheserverofthewebsite.Domainnamescanrefertospecificcomputers,organizations,companies,orotherentities.Eachdomainisnamedbythewayupwardfromittothe(unnamed)root. TheessenceofDNS(DomainNameSystem)istheinventionofahierarchical,domain-basednamingschemeandadistributeddatabasesystemforimplementingthisnamingscheme.Itisprimarilyusedformappinghostnamesande-maildestinationstoIPaddressesbutcanalsobeusedforotherpurposes.DNSisdefinedinRFCs1034and1035.Chapter13I.Pre-readingQuestChapter13I.Pre-readingQuestions2.HowmanyservicesareprovidedbytheInternet?Nameeachofthem.ReferenceKey:WWW(WorldWideWeb),E-mail,FTP(FileTransferProtocol),TelnetChapter13I.Pre-readingQuestChapter13I.Pre-readingQuestions3.IdentifytwowaysaccessingtoInternet,andexplainthedifferencesbetweenthem.ReferenceKey:Referstoconnectingadevicetoanetworkviaamodemandapublictelephonenetwork,dial-upaccessisreallyjustlikeaphoneconnection,exceptthatthepartiesatthetwoendsarecomputerdevicesratherthanpeople.Becausedial-upaccessusesnormaltelephonelines,thequalityoftheconnectionisnotalwaysgoodanddataratesarelimited.Inthepast,themaximumdataratewithdial-upaccesswasonly56Kbps(56000bitspersecond).Chapter13I.Pre-readingQuestChapter13I.Pre-readingQuestions3.IdentifytwowaysaccessingtoInternet,andexplainthedifferencesbetweenthem. DigitalSubscriberLine,orDSL,isamethodofaccessingtheinternetviatelephonelines.Itdiffersfromdial-upaccessinthatitmakesuseofaspecialfrequencyspectrumwhichallowsbothdigitalinformationandtelephoneservicestorunthroughthesamecable.Itisalsoagooddealfasterthandial-upInternet,theoreticallyprocessingupwardsof10megabitspersecond,incontrasttodial-up’ssluggish56kilobits(orroughlyfivepercentofamegabit).InfactsuchextremelyfastspeedsarerarelyobtainedbyDSLservicesbecausemostphonecompaniesinstallartificial“speedcaps”toimposeauniversallevelofserviceontheirlines.However,evenaslower-pacedDSLconnectioncanmakeforeasyandresponsivewebnavigation.Chapter13I.Pre-readingQuest本句是一个并列句。连词and连接两个句子：Anetworkisacollectionofcomputers和theInternetisanetworkofnetworks。句中的that引导定语从句修饰computers，连接副词so引导状语从句，表示thatareconnectedtogether的目的。1.Anetworkisacollectionofcomputersthatareconnectedtogethersotheycanshareinformation,andtheInternetisanetworkofnetworks.II.GrammaticalNotestotheText本句是一个并列句。连词and连接两个句子：Anetwork句首的不定式tomakeiteasier做目的状语，其中的it是形式宾语，其内容由不定式forsbtoremember表达出来。主句的谓语有短语beexpressed…as(被表述为)。句末的above是形容词，作后置定语，修饰介词短语liketheone中的代词one。2.Tomakeiteasierforushumanstoremember,IPaddressesarenormallyexpressedindecimalformatasa“dotteddecimalnumber”liketheoneabove.II.GrammaticalNotestotheText句首的不定式tomakeiteasier做目的状语，其该句第一个which引导的非限制性定语从句修饰alocalDNSserver。第二个which引导的非限制性定语从句则修饰theresolver。3.TheresolversendsaUDPpackertoalocalDNSserver,whichthenlooksupthenameandreturnstheIPaddresstotheresolver,whichthenreturnsittothecaller.II.GrammaticalNotestotheText该句第一个which引导的非限制性定语从句修饰alocalafterestablishingtheTCPconnectiontoport25为该句的时间状语，相当于一个由after引导的时间状语从句。现在分词短语operatingastheclient修饰thesendingmachine,operatingastheserver则修饰thereceivingmachine。4.AfterestablishingtheTCPconnectiontoport25,thesendingmachine,operatingastheclient,waitsforthereceivingmachine,operatingastheserver,totalkfirst.II.GrammaticalNotestotheTextafterestablishingtheTCPcon限制性定语从句thatsupportstheInternet修饰该句主语thesoftware。限制性定语从句uponwhicheverythingelse修饰technicalservices。5.ThesoftwarethatsupportstheInternetprovidesalargenumberoftechnicalservicesuponwhicheverythingelseisbuilt.II.GrammaticalNotestotheText限制性定语从句thatsupportstheInter现在分词结构作状语，表结果。限制性定语从句doneedtotalkabout修饰fourimportantInternetservices，其中在实义动词need前加上助动词do表示强调，强调动作talkabout。6.Nevertheless,therearefourimportantInternetserviceswedoneedtotalkabout.II.GrammaticalNotestotheText现在分词结构作状语，表结果。6.Nevertheless,本句中的which引导非限定性定语从句，修饰mailbox。连接副词until引导的状语从句表示时间。7.There,itwillbestoredintherecipient’s“mailbox,”whichisdeterminedbyhisorherusername,untilheorshepicksitup.II.GrammaticalNotestotheText本句中的which引导非限定性定语从句，修饰mailbox。本句的主体结构如下：theproblemisthat。句中第一个that是代词，做表语，其后的theyamplifytheentiresignal是表语的同位语，表示that的内容。第二个that引导的定语从句theyreceive，修饰signal。8.Theproblemwithrepeatersisthattheyamplifytheentiresignalthattheyreceive,includinganylinenoise.II.GrammaticalNotestotheText本句的主体结构如下：theproblemisthat。本句是一个强调句型：Itis…that…。介词短语bylearningwhichMACaddressesareliveonthenetwork是该句的强调成分，充当句中的状语。which引导的从句作动词learn的宾语(从句)。该句的主体结构可变换成：thebridgeisabletocontroltrafficandkeepitfromspreading。其中isableto和keep作为该句的并列谓语。句中的第二个和第三个that分别引导定语从句修饰traffic和segment。9.ItisbylearningwhichMACaddressesareliveonthenetworkthatthebridgeisabletocontroltrafficthatislocaltoaparticularsegmentandkeepitfromspreadingtoothernetworksegmentsthatarebeingservicedbyanotherbridgeswitch.II.GrammaticalNotestotheText本句是一个强调句型：Itis…that…。介词短语b该句是个复合句，主句是itdiffers。连接副词inthat引导出状语从句itmakesuseofaspecialfrequencyspectrum。连词which引导定语从句修饰hat意思是“由于，因为”。10.Itdiffersfromdial-upaccessinthatitmakesuseofaspecialfrequencyspectrumwhichallowsbothdigitalinformationandtelephoneservicestorunthroughthesamecable.II.GrammaticalNotestotheText该句是个复合句，主句是itdiffers。连接副词intadminister[Ed5ministE]v.管理，执行influential[7influ5enFEl]adj.有影响的，有势力的unique[ju:5ni:k]adj.唯一的，独特的respectively[ri5spektivli]adv.分别地，各个地octet[Ck5tet]n.八位位组,八位字节(=byte)troubleshooting[5trQbl5Fu:tiN]n.问题解答identifier[ai

5dentifaiE]n.标识符uniform[5ju:nifC:m]adj.统一的，一致的insensitive[in5sensitiv]adj.感觉迟钝的undeliverable[5Qndi5livErEbl]adj.无法送达的trigger[5tri^E]vt.引起，触发beneficial[beni5fiFEl]adj.有益的，受益的III.WordsBanktotheTextadminister[Ed5ministE]v.管理，axon[5AksCn]n.轴突nutshell[5nQtFel]n.坚果壳regenerate[ri5dVenErit]vt.使新生，重建integrity[in5te^riti]n.完整，完整性amplify[5Amplifai]vt.放大，增强discernable[di`s\:nEbl]adj.可辨别的，可认识的twist[twist]v.扭曲，缠绕outgrow[aut5^rEu]vt.过大而不适于conserve[kEn5sE:v]vt.保存，保藏overwhelming[7EuvE5welmiN]adj.压倒性的dedicated[5dedikeitid]adj.专用的filtration[fil5treiFEn]n.过滤，筛选III.WordsBanktotheTextaxon[5AksCn]n.轴突III.WordsIV.ExercisesComprehensionFilling

BlanksVocabularyTrueorFalseMatchingTermsSummaryCloze(SummarizingtheText)TranslatingSentencesCollocationAnsweringQuestionsSelectingWordsConceptualPhrasesTranslationIV.ExercisesComprehensionFil1.Internetisaworldwide_________andinterconnectedcomputernetwork.2.DNSisprimarilyusedformappinghostnamesande-maildestinationsto______.3.OntheInternet,thewordaddressalwaysreferstoan________address,notapostaladdress.1.Opening2.IPaddresses3.electronic

IV.Exercises—ComprehensionI.Fillinthefollowingblanks.1.Internetisaworldwide___4.SMTPisasimple________protocol.5.______isthestandard