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1、AcknowledgementsIfthereisnocarefulguidanceandprecioussuggestionsfromalltheprofessorsandmyclassmates,thestudycouldn?tbesuccessfullyachieved.First,Iwillexpressamillionthankstomysupervisor,ProfessorWuQiongforherconstructivesuggestions,attentivecorrections,andcreati
2、veinspirationintheprocessofmythesiswritingallthetime.Ifnohermeticulousguidance,thisstudycouldnotbefinishedfinally.Second,IshallthankAssociateProfessorZhaoTianshuandBaiZhigangfortheirgenerousassistances.Theirvaluablesuggestionsmademythesismoresystematicandlogical
3、.Next,honestappreciationwillbeshownforallmyteachersandschoolmatesinInstituteofForeignLanguage.Theyhavesuppliedmewithagreatdealofinspirationandmanyvaluablematerialsconcerningmythesis.Myearnestgratitudefinallygoestomyparentsbecauseoftheirunderstandingandsupport.Th
4、eirpatientsolicitudemademeovercomemanydifficultiesandalsoaccomplishedthepresentthesisultimately.iiAbstractIn1979,CriticalDiscourseAnalysis(CDA)asanewdiscourse-analysisapproachwasputforwardbyFowler,Kress,etal.,intheircommonly-composedbook.Intheprocessofdevelopmen
5、t,CDAhascombinedavarietyofsciencesintoitsresearchfield,suchascriticaltheoriesandsociology.Uptonow,asaninterdisciplinaryanalysisapproach,ithasdevelopedintooneofthemostsignificantbranchesintheareaoflinguistics.ThepresentstudywillanalyzeAmericanPresident,BarrackOba
6、ma?seightpoliticaldiscoursesprimarilyinFariclough?sthree-dimensionalframework.SinceHallidayconsidersthatpeopleshoulddescribenotonlylanguagestructureofdiscourse,butalsothewayinwhichdiscourseisdeterminedbysocialstructure.Therefore,Halliday?sfunctionalgrammarisboun
7、dtobeconsideredasthetheoreticalbasisofthepresentstudy.LanguagecharacteristicsofObama?spoliticalspeecheswillbefirstlypresentedthroughquantitativeandqualitativemethods.Next,basedonthethreemeta-functions,thestudywillfurtherinterpretthewayinwhichtheselanguagecharact
8、eristicsareproduced.Moreover,thesocialcontextofObama?spresidentialcampaignwillbecombinedintotheexplanationinordertofurtherinterprettherelationsofideologicalsystemandp
