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习题答案
Answers
Unit1
Part1Listening&Speaking
ListeningComprehension
1.C
2.B
3.A
原文如下:
Original
SoftwareEngineering
Today,computersoftwarehasbecomethekeyelementintheevolutionofcomputer-basedsystemsandproductsandoneofthemostimportanttechnologiesontheworldstage.Overthepast50years,softwarehasevolvedfromaspecializedproblemsolvingandinformationanalysistooltoanindustryinitselfandbecomesadominantfactorintheeconomiesoftheindustrializedworld.
Yetwestillhavetroubledevelopinghigh-qualitysoftwareontimeandwithinbudget.Whydoesittakesolongtogetsoftwarefinished?
Whyaredevelopmentcostssohigh?
Whycan’twefindallerrorsbeforewegivethesoftwaretoourcustomers?
Whydowespendsomuchtimeandeffortmaintainingexistingprograms?
Andwhydowecontinuetohavedifficultyinmeasuringprogressassoftwarebeingdevelopedandmaintained?
Thesequestionsandmanyothersdemonstratetheindustry’sconcernaboutsoftwareandthemannerinwhichitisdeveloped—aconcernthathasleadtotheadoptionofsoftwareengineeringpractice.
Then,whatissoftware?
Andwhichcharacteristicsofsoftwaremakeitdifferentfromotherthingsthathumanbeingsbuild?
Softwareisalogicalratherthanaphysicalsystemelement,andsomecharacteristicsmakesoftwarespecial.First,itisdifficultforacustomertospecifyrequirementscompletely,anddifficultforthesuppliertounderstandfullythecustomerneedsaswell.Indefiningandunderstandingrequirements,especiallychangingrequirements,largequantitiesofinformationneedtobecommunicatedandassimilatedcontinuously.Second,softwareisseeminglyeasytochangeandisprimarilyintangible,andmuchoftheprocessofcreatingsoftwareisalsointangible,involvingexperience,thoughtandimagination.Inaddition,itisdifficulttotestsoftwareexhaustively.
Software—programs,data,anddocuments—addressesawiderangeoftechnologyandapplicationareas,yetallsoftwareevolvesaccordingtoasetoflawsthathaveremainedthesameforover30years.Theintentofsoftwareengineeringistoprovideaframeworkandasolutionforbuildinghigherqualitysoftware.Itincludesgreateremphasisonsystematicdevelopment,aconcentrationonfindingouttheuser’srequirements,formal/semiformalspecificationsoftherequirementsofasystem,demonstrationofearlyversionofasystem(prototype),greateremphasesontryingtoensureerrorfreecodeandsoon.
Fromthetimein1968whenthephrase“softwareengineering”wasfirstusedataNATOconferenceuntilthepresentday,softwarehascomealongway.Butitstillhasaverylongwaytogoifitistobeconsideredasmatureasotherengineeringdisciplines.
Dictation
1.known
2.projectmanager
3.OperatingSystem
4.human
5.publication
6.bookshelf
7.statement
8.manpower
9.later
10.law
11.environments
12.collaborative
13.individuals
14.originally
15.embodied
16.drop
17.circulation
18.programming
19.productivity
20.run
Part2ReadingandTranslating
SectionA
Ⅰ.
1.F
2.F
3.T
4.T
5.F
Ⅱ.
1.D
2.D
3.B
III.
(1)由于计算机与信息系统的结合以及复杂的图形用户界面而产生的新技术对软件工程师提出了新的要求。
(2)不同类型系统和使用这些系统的不同类型组织的广泛的多样性,意味着我们需要软件开发方法的多样性。
SectionB
Ⅰ.
1.F
2.T
3.F
4.F
5.T
Ⅱ.
1.C
2.D
3.D
III.
(1)当芯片设计者为微处理器开发各种各样的指令集的同时,他们增加了越来越复杂的指令,每个指令的执行都需要若干时钟周期。
Unit2
Part1Listening&Speaking
ListeningComprehension
1.A
2.C
3.C
原文如下:
Original
SoftwareRequirements
Itisnecessarytounderstandrequirementsbeforedesignandconstructionofacomputer-basedsystemcanbegin.Toaccomplishthis,asetofrequirementsengineeringtasksareconducted.Requirementsengineeringoccursduringthecustomercommunicationandmodelingactivitiesthatwehavedefinedforthegenericsoftwareprocess.Sevendistinctrequirementsengineeringfunctions—inception,elicitation,elaboration,negotiation,specification,validation,andmanagement—areconductedbymembersofthesoftwareteam.
Atprojectinception,thedeveloperandthecustomeraswellasotherstakeholdersestablishbasicproblemrequirements,defineoverridingprojectconstraints,andaddressmajorfeaturesandfunctionsthatmustbepresentforthesystemtomeetitsobjectives.Thisinformationisrefinedandexpandedduringelicitation,whichisarequirementsgatheringactivitythatmakesuseoffacilitatedmeetingsandthedevelopmentofuserscenarios.
Elaborationfurtherexpandsrequirementsintoananalysismodel—acollectionofscenario-based,activity-based,class-based,behavioral,andflow-orientedmodelelements.Avarietyofmodelingnotationsmaybeusedtocreatetheseelements.Themodelmayreferenceanalysispatterns-characteristicsoftheproblemdomainthathavebeenseentoreoccuracrossdifferentapplications.
Asrequirementsareidentifiedandtheanalysismodeliscreated,thesoftwareteamandotherprojectstakeholdersnegotiatethepriority,availability,andrelativecostofeachrequirement.Theintentofthisnegotiationistodeveloparealisticprojectplan.Inaddition,eachrequirementandtheanalysismodelasawholearevalidatedagainstcustomerneedtoensurethattherightsystemistobebuilt.
Dictation
1.engineers
2.follows
3.cases
4.same
5.projects
6.working
7.organizations
8.group
9.originally
10.built
11.overall
12.requirements
13.product
14.department
15.component
16.contrary
17.actually
18.achieve
19.purposes
20.operational
Part2ReadingandTranslating
SectionA
Ⅰ.
1.T
2.F
3.T
4.T
5.T
Ⅱ.
1.B
2.D
3.C
III.
(1)对于详细说明软件需求中的困难,根本原因源于其涉及客户、最终用户、以及软件开发人员的有关三方。
SectionB
Ⅰ.
1.F
2.F
3.T
4.T
5.T
Ⅱ.
1.A
2.B
3.D
III.
(1)正如我们所知,指示一台计算机如何执行一项任务的指令被称为计算机程序。
(2)这类软件包含大量数据——不像数据库软件,数据库软件销售时不带任何数据。
Unit3
Part1Listening&Speaking
ListeningComprehension
1.B
2.D
3.C
原文如下:
Original
SoftwareProjectPlanning
Therearemanydifferentplanningphilosophies.Somepeopleare“minimalists”,arguingthatchangeoftenobviatestheneedforadetailedplan.Othersare“traditionalists”,arguingthattheplanprovidesaneffectiveroadmap,andthemoredetailithas,thelesslikelytheteamwillbecomelost.Stillothersare“agilists”,arguingthataquick“planninggame”maybenecessary,buttheroadmapwillemergeas“realwork”onthesoftwarebegins.
Whattodo?
Onmanyprojects,over-planningistimeconsumingandfruitless(toomanythingschange),butunder-planningisarecipeforchaos.Likemostthingsinlife,planningshouldbeconductedinmoderation,enoughtoprovideusefulguidancefortheteam–nomore,noless.
Inanexcellentpaperonsoftwareprocessandprojects,BarryBoehmstates:
“Youneedanorganizingprinciplethatscalesdowntoprovidesimpleplansforsimpleprojects.”Boehmsuggestsanapproachthataddressesprojectobjectives,milestonesandschedules,responsibilities,managementandtechnicalapproaches,andrequiredresources.HecallsittheW5HHprinciple,afteraseriesofquestionsthatleadtoadefinitionofkeyprojectcharacteristicandtheresultantprojectplan:
Whyisthesystembeingdeveloped?
Whatwillbedone?
Whenwillitbeaccomplished?
Thoseabovearethemostindispensable.Inaddition,Whoisresponsibleforafunction?
Wherearetheyorganizationallylocated?
Howwillthejobbedonetechnicallyandmanagerially?
AndHowmuchofeachresourceisneeded?
TheanswerstoBoehm’sW5HHquestionsareimportantregardlessofthesizeorcomplexityofasoftwareproject.
Dictation
1.activities
2.pre-defined
3.finite
4.process
5.schedule
6.classic
7.control
8.interacting
9.over-budget
10.quality
11.within
12.lifecycle
13.saying
14.baby
15.visible
16.choose
17.implied
18.inputs
19.pick
20.meeting
Part2ReadingandTranslating
SectionA
Ⅰ.
1.T
2.F
3.F
4.T
5.T
Ⅱ.
1.B
2.C
3.D
III.
(1)为了即使在风险存在的情况下能够达到项目目标,需要适当的风险管理。
(2)通过适当的监控,这些情况能够被识别,从而可以相应地改变计划。
SectionB
Ⅰ.
1.F
2.T
3.F
4.T
5.F
Ⅱ.
1.D
2.C
3.A
III.
(1)不过,主要区别在于,多用户操作系统排定在一个集中式计算机上的处理请求,而网络操作系统仅仅是将数据和程序路由到每个用户的本地计算机,实际处理是发生在每个用户的本地计算机上。
Unit4
Part1Listening&Speaking
ListeningComprehension
1.C
2.B
3.D
原文如下:
Original
ProjectTeam
Therearemanyreasonsthatsoftwareprojectsgetintotrouble.Manyprojects,inwhichthescaleofeffortsislarge,needtobedevelopedbyprojectteamsranginginsizefromtwotoseveralhundredpeople.Thatisleadingtocomplexity,confusion,andsignificantdifficultiesincoordinatingteammembers.Puttingtogetheragroupthatworkseffectivelyisthereforeacriticalmanagementtask.Agoodgrouphasateamspiritsothatthepeopleinvolvedaremotivatedbythesuccessofthegroupaswellasbytheirownpersonalgoals.
IanSommervilledescribesthisspiritas“cohesiveness”inhisbookSoftwareEngineering.Inacohesivegroup,membersthinkofthegroupasmoreimportantthantheindividualinit.Membersofawell-led,cohesivegroupareloyaltothegroup.Theyidentifywithgroupgoalsandwithothergroupmembers.Theyattempttoprotectthegroup,asanentity,fromoutsideinterference.Thismakesthegrouprobustandabletocopewithproblemsandunexpectedsituations.Thegroupcancopewithchangebyprovidingmutualsupportandhelp.Theadvantagesofacohesivegroupincludeagroupqualitystandardthatisestablishedbyconsensusandobservedbyself,groupmembersworkingcloselytogether,learningfromeachother,gettingtoknoweachother’swork,practicingegolessprogramming,and