| 摘要 | 第1-4页 |
| Abstract | 第4-8页 |
| 1 Introduction | 第8-10页 |
| ·Background of the Study | 第8-9页 |
| ·Purpose of the Study | 第9页 |
| ·Organization of the Thesis | 第9-10页 |
| 2 Literature Review | 第10-26页 |
| ·Definition of Lexical Chunks | 第10-11页 |
| ·Calegories of Lexical Chunks | 第11-17页 |
| ·Functions of Lexical Chunks | 第17-19页 |
| ·Facilitating Language Fluency | 第17页 |
| ·Promoting Language Idiomaticity | 第17-18页 |
| ·Cultivating Text-Organizing Ability | 第18页 |
| ·Improving Grammar Competence | 第18-19页 |
| ·Theoretical Basis of Lexical Chunks | 第19-21页 |
| ·Lexical Chunks in Psycholinguistics | 第19-20页 |
| ·Lexical Chunks in Language Acquisition | 第20-21页 |
| ·A General Study on Lexical Chunks and Writing | 第21-23页 |
| ·Advantages of Lexical chunks in English Writing | 第23-25页 |
| ·Quickly Organizing the Framework from the Whole | 第23-24页 |
| ·Enhancing Coherence and Logic of Writing | 第24页 |
| ·Improving Accuracy of Writing | 第24-25页 |
| ·Promoting Idiomaticity of Writing | 第25页 |
| ·Summary | 第25-26页 |
| 3 Methodology | 第26-30页 |
| ·Research Hypotheses | 第26页 |
| ·Subject | 第26页 |
| ·Instruments | 第26-27页 |
| ·Procedures | 第27-28页 |
| ·Date Collection and Analysis | 第28-29页 |
| ·Summary | 第29-30页 |
| 4 Results and Discussion | 第30-44页 |
| ·Number and Frequency of Lexical Chunks Used in Writing | 第30-32页 |
| ·Number and Frequency of Lexical Chunks Used in Argumentative Writing | 第30-31页 |
| ·Number and Frequency of Lexical Chunks Used in Practical Writing | 第31页 |
| ·Comparison of Number and Frequency of Lexical Chunks Used in Argumentativeand Practical Writing | 第31-32页 |
| ·Distribution of Four Categories of Lexical Chunks between Two Groups | 第32-35页 |
| ·Distribution in the Argumentative Writing | 第32-33页 |
| ·Distribution in Practical Writing | 第33-34页 |
| ·Comparison of Distribution of Lexical Chunks between Two Writings | 第34-35页 |
| ·Difference of the Same Category of Lexical Chunks between Two Groups by T-test | 第35-37页 |
| ·Difference of the Same Category Lexical Chunks in Argumentative Writing | 第35-36页 |
| ·Difference of the Same Category Lexical Chunks in Practical Writing | 第36-37页 |
| ·Comparison of Difference of the Same Category Lexical Chunks inArgumentative Writing and Practical Writing | 第37页 |
| ·Correlation between Lexical Chunks and High Score Compositions | 第37-40页 |
| ·Correlation between Lexical Chunks and High Score Compositions inArgumentative Writing | 第37-38页 |
| ·Correlation between Lexical Chunks and High Score Compositions in PracticalWriting | 第38-39页 |
| ·Comparison of Lexical Chunks Contributing to Compositions Scores | 第39-40页 |
| ·Analysis of Low-score Compositions | 第40-42页 |
| ·Summary | 第42-44页 |
| 5 Pedagogical Implications | 第44-51页 |
| ·Improving Teaching Methodology | 第44页 |
| ·Raising Students' Awareness of Lexical Chunks | 第44-46页 |
| ·Developing Strategies of Teaching Lexical Chunks | 第46-49页 |
| ·Encouraging Autonomous Learning | 第49-50页 |
| ·Summary | 第50-51页 |
| Conclusion | 第51-53页 |
| Notes | 第53-54页 |
| Bibliography | 第54-57页 |
| Appendix | 第57-59页 |
| Publications during M.A.Study | 第59-60页 |
| Acknowledgements | 第60-61页 |
