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AcknowledgementsIwouldliketoexpressmygratitudetoallthosewhohelpedmeduringthewritingofthisthesis.Igratefullyacknowledgethehelpofmysupervisor,Ms.HanLin,whohasofferedmevaluablesuggestionsintheacademicstudiesandwhoseusefulsuggestions,incisivecommentsandconstructivecriticismhavecontributedgreatlytothecompletionofthisthesis.Inthepreparationofthethesis,herwillingnesstogivemehertimesogenerouslyhasbeenmuchappreciated.HertremendousassistanceindevelopingtheframeworkforanalysisandinhavinggonethroughthedraftversionsofthisthesisseveraltimesaswellashergreatcareinlifedeservemorethanksthanIcanfindwordstoexpress.Truly,withoutherpainstakingeffortsinrevisingandpolishingmydrafts,thecompletionofthepresentthesiswouldnothavebeenpossible.Idoappreciateherpatience,encouragement,andprofessionalinstructionsduringmythesiswriting.Shedevotesaconsiderableportionofhertimetoreadingmymanuscriptsandmakingsuggestionsforfurtherrevisions.IamalsogreatlyindebtedtoallmyteachersinForeignLanguageSchoolofShaanxiUniversityofTechnologywhohavehelpedmedirectlyandindirectlyinmystudies,fromwhosedevotedteachingandenlighteninglecturesIhavebenefitedalotandacademicallypreparedforthethesis.AnyprogressthatIhavemadeistheresultoftheirprofoundconcernandselflessdevotion.Lastbutnottheleast,mygratitudealsoextendstomyfamilywhohavebeenassisting,supportingandcaringformeallofmylife.Specialthanksshouldgotomyfriendswhohaveputconsiderabletimeandeffortintotheircommentsonthedraft.Ialsoowemysinceregratitudetomyfellowclassmateswhohavegivenmethewarmhelpandprecioustimetoworkoutmyproblemsduringthetoughcourseofthethesis.