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uch of hertime giving me direction and reading, correcting my thesis paper. Without her advices,I would have been lost in a wrong field. I would also like to thank all of my teachers in the English Department of ChinaForeign Affairs University, especially to Professor Shi Yi, Professor Sun Jisheng,Professor Song Aiqun, Professor He Qun and Professor Cui Changqing. I have learneda lot from them during my time at this university, and I will always miss the time Ihave spent together with them in the classroom. I would like to express my thanks to all faculty members who have provided usnumerous support and help. Finally, and most importantly, I would like to thank my parents. Their support,encouragement, quiet patience and unwavering love are the driving power of my work. I thank my son, Gao Zizheng,