| 摘要 | 第1-6页 |
| Abstract | 第6-9页 |
| I Introduction | 第9-11页 |
| ·Research Questions | 第9页 |
| ·Purpose of the Research | 第9页 |
| ·Significance of the Study | 第9-10页 |
| ·Structure of the Thesis | 第10-11页 |
| 2 Literature Review | 第11-30页 |
| ·Definition and Main Research Category of Educational Ecology | 第11-12页 |
| ·Literature Review of Researches on Educational Ecology | 第12-15页 |
| ·Researches on Educational Ecology Abroad | 第12-13页 |
| ·Domestic Researches on Educational Ecology | 第13-15页 |
| ·Connotation of Ecological Classroom and Its Basic Characteristics | 第15-18页 |
| ·Constituent Elements of Classroom Ecological System | 第15-16页 |
| ·Connotation of Ecological Classroom | 第16-17页 |
| ·Basic Characteristics of Ecological Classroom | 第17-18页 |
| ·Definitions and Literature Review of Teacher Talk（TT） | 第18-22页 |
| ·Definitions of TT | 第19-20页 |
| ·Literature Review of Studies on TT Abroad | 第20页 |
| ·Literature Review of Studies on TT At Home | 第20-22页 |
| ·Literature Review of Studies on Functions of TT | 第22-24页 |
| ·Theoretical Basis of the Study | 第24-30页 |
| ·Related Principles of Educational Ecology | 第24-26页 |
| ·Constructivism | 第26-28页 |
| ·Humanism | 第28-30页 |
| 3 Research Methodology | 第30-34页 |
| ·Subjects | 第30页 |
| ·Instruments | 第30-32页 |
| ·Class recordings | 第31页 |
| ·Questionnaires for Students and Teachers | 第31-32页 |
| ·Teacher Interview | 第32页 |
| ·Results | 第32-34页 |
| 4 Discussion and Analysis | 第34-52页 |
| ·Amount of TT (Teacher Talk) | 第34-38页 |
| ·Amount of TT (Teacher Talk) and ST (Student Talk) | 第34-36页 |
| ·Amount of Teachers' ML (Mother Language) | 第36-38页 |
| ·Norm of TT | 第38-39页 |
| ·Teachers' Questions | 第39-45页 |
| ·Types of Teachers' Questions | 第39-42页 |
| ·Ways of Seeking Answers | 第42-44页 |
| ·Wait Time after Questioning | 第44-45页 |
| ·Feedback TT | 第45-48页 |
| ·Expansion TT | 第48-49页 |
| ·Interactional Modifications | 第49-52页 |
| 5 Conclusion | 第52-57页 |
| ·Conclusion of the Research | 第52-53页 |
| ·Implications for English Teaching | 第53-55页 |
| ·College English Teachers' Ecological Idea Needs to Be Strengthened | 第53-54页 |
| ·Teachers' Professional Knowledge Needs to Be Constantly Improved | 第54页 |
| ·More TT Strategies Need to Be Studied and Used by Teachers | 第54-55页 |
| ·Emotion Existed in TT Needs to Be Further Enhanced | 第55页 |
| ·Limitations of the Research and Recommendations for Future Study | 第55-57页 |
| References | 第57-62页 |
| Appendix A 大学英语课教师话语使用现状调查问卷（学生用） | 第62-65页 |
| Appendix B Result of Questionnaire for Students | 第65-66页 |
| Appendix C 大学英语课教师话语使用现状调查问卷（教师用） | 第66-69页 |
| Appendix D Result of Questionnaire for Teachers | 第69-70页 |
| Appendix E 大学英语教师访谈提纲 | 第70-71页 |
| Appendix F Part of Transcriptions of Class recordings | 第71-77页 |
| Acknowledgements | 第77-78页 |
