签字日期: 年月日签字日期: 年月日 Acknowledgements First and foremost I‟d like to express my sincerely thanks to my supervisors, Professor Zhang Jing, for her insightful advice and suggestions, her constructive ideas, his stimulating comments, and his constant encouragement during my thesis-writing period. Secondly, I am grateful to Dr. Tian Minggang who gives me some suggestions in my study and the thesis, and advises me to read some books of relevant literary theories. I also feel eternal gratitude to all the teachers who have taught me during my three years‟ postgraduate study. They are Tang Wenli, who taught me the course American Literature, Lin Lexiang, who taught me the course Thesis Writing, and many other respectable leaders and teachers in Gannan Normal University. Last but not least I want to give my heartfelt thanks to my classmates who always help me a lot and my best friend for her consistent help and sup
