Wewishtothankallthosewhohavegivenusconsistenthelp，，encouragementandadvice，amongwhomareProfessorQinXiubai，ProfessorGuoJiekeandMr.YinHonghuiofSouthChinaUniversityofTechnologyandProfessorLiLiandProfessorXiangXueqinofSouthwestChinaNormalUniversity.WearegratefultothepostgraduatesandMAstudentsoftheSchoolofForeignLanguages，SouthwestChinaNormalUniversity，whohavebeenthetargetpopulationforthematerialsnowinbookform.Withouttheirpatienceandcomments，manyofthepitfallsofthebookwouldhavestillremained，andthishandbookwouldhavenevercometofruition.WeareespeciallyindebtedtoProfessorQinXiubai，whohasreadthefinaldraftcarefullyandmeticulouslyandhasmadevaluablesuggestionsandnumerouscorrections.ProfessorJohnHasselbergoftheCollegeofSt.Benedict/St.JohnsUniversitynearSt.Cloud，Minnesota，hasreadthefinaldrafttoensurethelanguageisidiomatic.WewouldalsoliketothankMsXuYanmeiofHigherEducationPressforthetremendousworkshehasdonetoensurethepublicationofthebook.