Acknowledgements In writing this paper, I want to thank all my teachers ,for their teaching and kind support, their continuous encouragement and massive help during these years. To the my twenty six classmates who helped me with my research, for their enthusiastic participation;To my friends in shijiazhuang, beijing, Liverpool, Western Ontario encouragement and great support. Second, I would like to express my heartfe lt gratitude to professors Fu Tianjun, my advisor who spent much of his precious time discussing with me and helping me to narrow the topic at the initial stages, as well as showing great concern for my progress. I am deeply indebted for his assistance in helping me to accomplish this study. Without his encouragement and specific guidance, the completion of this thesis would have been impossible. In addition, he has been very kind to me whenever I confronted problems during the project. Also, I hereby express my sincere gratitude to my classmates and roommates, who helped me to do the data collection I needed for this project. They have generously offered their help at the preparatory stage during this study. Finally, I thank the subjects whose cooperation and participation contributed to the very basis for this research work.
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