| Acknowledgements | 第5-6页 |
| Abstract in English | 第6-7页 |
| Abstract in Chinese | 第8-14页 |
| Chapter One Introduction | 第14-18页 |
| 1.1 Background of the Research | 第14-16页 |
| 1.2 Objectives of the Research | 第16页 |
| 1.3 Significance of the Research | 第16-17页 |
| 1.4 Organization of the Thesis | 第17-18页 |
| Chapter Two Literature Review | 第18-36页 |
| 2.1 Lexical Chunks | 第18-25页 |
| 2.1.1 Definition of Lexical Chunks | 第18-19页 |
| 2.1.2 Previous Studies on Lexical Chunks | 第19-25页 |
| 2.2 Theme Teaching | 第25-29页 |
| 2.2.1 Definition of Theme Teaching | 第25-26页 |
| 2.2.2 Previous Studies on Theme Teaching | 第26-29页 |
| 2.3 Lexical Chunks and English Writing | 第29-33页 |
| 2.3.1 Previous Studies on Lexical Chunks and English Writing Abroad | 第29-31页 |
| 2.3.3 Previous Studies on Theme-based Lexical Chunks and English Writing | 第31-33页 |
| 2.4 Critical Evaluation on Previous Studies | 第33-36页 |
| Chapter Three Theoretical Framework | 第36-42页 |
| 3.1 Krashen’s Input Hyp | 第36-37页 |
| 3.2 Swain’s Output Hypothesis | 第37-39页 |
| 3.3 Lexical Chunk Acquisition Theory | 第39-42页 |
| Chapter Four Research Methodology | 第42-82页 |
| 4.1 Research Questions | 第42页 |
| 4.2 Participants | 第42-43页 |
| 4.3 Research Instruments | 第43-45页 |
| 4.3.1 Questionnaire | 第43页 |
| 4.3.2 Interviews | 第43-44页 |
| 4.3.3 Classroom Observation | 第44页 |
| 4.3.4 Teaching Journals | 第44页 |
| 4.3.5 Tests | 第44-45页 |
| 4.4 Introduction to Action Research | 第45-46页 |
| 4.5 Action Research Procedures | 第46-81页 |
| 4.5.1 Problem Identification | 第46-50页 |
| 4.5.2 Overall Planning | 第50-51页 |
| 4.5.3 The First-round of Action Research | 第51-68页 |
| 4.5.4 The Second-round of Action Research | 第68-81页 |
| 4.6 Summary | 第81-82页 |
| Chapter Five Results and Discussion | 第82-92页 |
| 5.1 Results of English Writing Tests | 第82-85页 |
| 5.2 Results of Interviews | 第85-86页 |
| 5.3 Results of Teaching Journals | 第86页 |
| 5.4 Results of Classroom Observation | 第86-87页 |
| 5.5 Discussion in Relation to Research Question 1 | 第87-89页 |
| 5.6 Discussion in Relation to Research Question 2 | 第89-92页 |
| Chapter Six Conclusions | 第92-96页 |
| 6.1 Major Findings of the Study | 第92-93页 |
| 6.2 Pedagogical Implications | 第93-94页 |
| 6.3 Limitations of the Study | 第94-95页 |
| 6.4 Suggestions for Further Studies | 第95-96页 |
| References | 第96-100页 |
| Appendices | 第100-113页 |
| Appendix 1 A Survey on High School Students’ Writing Situation | 第100-101页 |
| Appendix 2 Students’ English Writing Scores | 第101-102页 |
| Appendix 3 Lexical Chunks’ Numbers Students Used in Writing Tests | 第102-103页 |
| Appendix 4 Pre-test of English Writing | 第103-104页 |
| Appendix 5 While-test of English Writing | 第104-105页 |
| Appendix 6 Post-test of English Writing | 第105-106页 |
| Appendix 7 Outline of the Interview Questions | 第106-107页 |
| Appendix 8 Classroom Observation Table | 第107-108页 |
| Appendix 9 Teaching Journals | 第108-109页 |
| Appendix 10 The Writing Requirements of New English Curriculum Standards | 第109-110页 |
| Appendix 11 Writing Scoring Standards of NMET | 第110-112页 |
| Appendix 12 A Sample Composition in While-test | 第112-113页 |
| Appendix 13 A Sample Composition in Post-test | 第113页 |
