| Acknowledgements | 第1-6页 |
| Abstract | 第6-8页 |
| 摘要 | 第8-10页 |
| List of Abbreviation | 第10-14页 |
| Chapter 1 Introduction | 第14-19页 |
| ·Research background | 第14-16页 |
| ·Research objectives | 第16-17页 |
| ·Research significance | 第17页 |
| ·Organization of the thesis | 第17-19页 |
| Chapter 2 Literature Review | 第19-42页 |
| ·Previous studies of lexical chunks | 第19-28页 |
| ·Definitions of lexical chunks | 第19-22页 |
| ·Classifications of lexical chunks | 第22-26页 |
| ·Functions of lexical chunks | 第26-28页 |
| ·Lexical chunks and language teaching | 第28-36页 |
| ·Background of lexical approach | 第28-29页 |
| ·Teaching approaches applying lexical chunks | 第29-33页 |
| ·Teaching approach by Willis | 第29-30页 |
| ·Lexical approach by Michael Lewis | 第30-32页 |
| ·Teaching approach by Nattinger & DeCarrico | 第32-33页 |
| ·Application of lexical approach to senior English writing | 第33-36页 |
| ·Research on lexical chunks in language teaching | 第36-41页 |
| ·Research abroad | 第36-38页 |
| ·Research in China | 第38-41页 |
| ·Summary | 第41-42页 |
| Chapter 3 Research Methodology | 第42-52页 |
| ·Research hypotheses | 第42-43页 |
| ·Subjects | 第43-44页 |
| ·Instruments | 第44页 |
| ·Procedures | 第44-50页 |
| ·Writing proficiency tests: pre-test, mid-test and post-test | 第44-45页 |
| ·Instruction | 第45-49页 |
| ·Questionnaire | 第49-50页 |
| ·Interview | 第50页 |
| ·Methods of data collection and analysis | 第50-51页 |
| ·Date collection | 第50-51页 |
| ·Data analysis | 第51页 |
| ·Summary | 第51-52页 |
| Chapter 4 Quantitative Analysis and Discussion | 第52-71页 |
| ·Statistical results of the composition scores | 第52-58页 |
| ·Statistical results of the number of lexical chunks | 第58-68页 |
| ·Correlation analysis of lexical chunks used and composition scores | 第68-69页 |
| ·Summary | 第69-71页 |
| Chapter 5 Qualitative Analysis and Discussion | 第71-88页 |
| ·Differences of using lexical chunks between high-rated and low- rated compositions | 第71-78页 |
| ·Comparison of the number of lexical chunks | 第71-73页 |
| ·Comparison of the types of lexical chunks | 第73-74页 |
| ·Comparison of the frequently used lexical chunks | 第74-75页 |
| ·Comparison of the quality of lexical chunks | 第75-76页 |
| ·Comparison of the discourse devices used | 第76-78页 |
| ·Analysis of questionnaire | 第78-83页 |
| ·Analysis of interview | 第83-87页 |
| ·Summary | 第87-88页 |
| Chapter 6 Conclusion | 第88-94页 |
| ·Major findings | 第88-90页 |
| ·Pedagogical implications | 第90-92页 |
| ·Limitations | 第92-93页 |
| ·Suggestions for further research | 第93-94页 |
| Bibliography | 第94-99页 |
| Appendix 1 Raw Scores of Subjects’Compositions | 第99-101页 |
| Appendix 2 Raw Scores of the Number of Lexical Chunks | 第101-105页 |
| Appendix 3 Writing Tasks in the Three Tests | 第105-106页 |
| Appendix 4 Criterion of Grading for NMET | 第106-108页 |
| Appendix 5 Questionnaire | 第108-110页 |
| Appendix 6 List of Published Papers | 第110页 |
