Moreover, his serious scholarship and academic practices, his conscientious andacademic attitude towards teaching and above all, his agreeable personality, haveinfluenced me immensely during the past three years, which also will be a life-longwealth for me.

　　Appreciation also goes to other professors and teachers in the School of ForeignStudies, CUMT, who have helped me in my postgraduate studies and enlightened meduring the past three years.

　　Besides, I feel deeply indebted to my parents and friends, who have helped mesubstantially through the tough process of thesis writing. My special thanks go to mybest friends whose great help and support have accompanied me all the way in thelong and rewarding experience of writing this thesis.