| Acknowledgements | 第1-5页 |
| Abstract | 第5-7页 |
| 摘要 | 第7-8页 |
| Contents | 第8-12页 |
| Chapter One Introduction | 第12-15页 |
| ·Background of the Research | 第12-13页 |
| ·Aim of the Research | 第13-14页 |
| ·Organization of the Thesis | 第14-15页 |
| Chapter Two Literature Review | 第15-29页 |
| ·Researches on Prefabricated Chunk | 第15-20页 |
| ·Definition of Prefabricated Chunk | 第15-16页 |
| ·Categorization of Prefabricated Chunk | 第16-18页 |
| ·Functions of Prefabricated Chunk | 第18-20页 |
| ·Chunks Help Improve Language Fluency | 第18-19页 |
| ·Chunks Help Improve Language Accuracy | 第19页 |
| ·Chunks Help Improve Language Appropriateness | 第19-20页 |
| ·Previous Studies on Prefabricated Chunk in Second Language Acquisition | 第20-27页 |
| ·Studies Conducted Abroad | 第20-24页 |
| ·Studies Conducted in China | 第24-25页 |
| ·Studies Conducted on Chunk Use in Chinese Learners' Writing | 第25-27页 |
| ·Summary | 第27-29页 |
| Chapter Three Research Design and Methodology | 第29-38页 |
| ·Research Questions | 第29-30页 |
| ·Research Methods | 第30-32页 |
| ·Corpus-based Approach | 第30-32页 |
| ·Instruments | 第32页 |
| ·Materials in Each Part | 第32-35页 |
| ·Materials for the First Part | 第33页 |
| ·Materials for the Second Part | 第33-34页 |
| ·Materials for the Third Part | 第34-35页 |
| ·Data Collection | 第35-38页 |
| ·The Criterion for Chunk Identification | 第35页 |
| ·Procedures | 第35-38页 |
| Chapter Four Results and Discussion | 第38-54页 |
| ·Chunks Used in Essays of CET-4 and CET-6 | 第38-46页 |
| ·General Analyses of Chunks Used in Essays of CET-4 and CET-6 | 第38-44页 |
| ·High Frequency Chunks in Essays of CET-4 and CET-6 | 第44-46页 |
| ·Chunks Employed by High-score Group and Low-score Group | 第46-50页 |
| ·Chunk Use and Writing Achievement | 第50-54页 |
| Chapter Five Conclusion | 第54-59页 |
| ·Summary of Major Findings | 第54-55页 |
| ·Features of the Chunks Employed in Essays of CET-4 and CET-6 | 第54-55页 |
| ·Comparison between the Chunks Employed by High-score Essays and Low-score Essays | 第55页 |
| ·Relationship between Chunk Use and Writing Achievement | 第55页 |
| ·Implications of the Research Findings | 第55-57页 |
| ·Limitations of the Research | 第57-58页 |
| ·Suggestions for Further Researches | 第58-59页 |
| References | 第59-62页 |
| Appendices | 第62-64页 |
| Publications | 第64页 |
