AcknowledgementThanks for giving me this chance to finish this paper and to make the conclusion for my four years’ education
Through writing this paper, I have gained more knowledge than I supposed
I would like to express my gratitude to all those who helped me during the writing of this thesis
My deepest gratitude goes first and foremost to my supervisor, Ms
Liu Xiaoying, for her constant encouragement and guidance
Her corrections and suggestions make me get great progress in writing this thesis
Without his consistent and illuminating instruction, this thesis could not have reached its present form
Here, I also want to give my thanks to other teachers and my classmates who have given me much help in the past four years
Thank you very much
AbstractEmotional factors are an important a