【正文】
t and has spent much of histime in offering valuable advice and guidance in my writing, and whose intellect insightshave contributed greatly to the pletion of this thesis. Had he not devoted his painstaking efforts to reading patiently each draft and making critical ments, the pletionof this thesis would have been impossible. My special thanks also go to all my teachers in Inner Mongolia Normal Universitywhose inspiring lectures have had an undoubted influence on much of the co ntent of mythesis. I would like to extend my heartfelt gratitude to the authors whose words I havecited or quoted, and to the scholars upon whose ideas I have freely drawn. Special thanks should also go to my students for their enthusiasm and cooperationin the survey study. Finally, I would like to give acknowledgements to my husband, my good friendsand my parents. Their love, care, support and incessant encouragement have helped meovere many difficulties throughout the thesis writing. 4