给你我的吧..不过我是把三份范文结合起来的..

　　Firstandforemost,Iappreciatemycountrywhogivemeacomfortablelearningatmosphere.Second,Iwouldliketoshowmydeepestgratitudetomysupervisor,Prof.LiYuexiang,whohaswalkedmethroughallthestagesofthewritingofthisthesis.Withoutherilluminatinginstructionandpatience,thisthesiscouldnothavereacheditspresentform.Iamalsogreatlyindebtedtoallmyteacherswhohavehelpedmetodevelopthefundamentalandessentialacademiccompetence.Mysincereappreciationalsogoestoallmyclassmates,whoaremyproudofmylife.Lastbutnotleast,Iwanttothankallmyfriends,especiallymythreelovelyroommates,fortheirencouragementandsupport.