| Abstract | 第1-5页 |
| 摘要 | 第5-8页 |
| Chapter Ⅰ Introduction | 第8-11页 |
| ·Background of the study | 第8-9页 |
| ·Significance of the study | 第9-10页 |
| ·General outline of the thesis | 第10-11页 |
| Chapter Ⅱ Literature Review | 第11-19页 |
| ·Krashen?s Input Hypothesis | 第11-15页 |
| ·Researches on lead-in in China | 第15-18页 |
| ·Researches on lead-in out of China | 第18-19页 |
| Chapter Ⅲ Research Design | 第19-26页 |
| ·Research questions | 第19-20页 |
| ·Research participants | 第20-23页 |
| ·Research instruments | 第23-24页 |
| ·Research procedures | 第24-26页 |
| Chapter Ⅳ Results and Discussion | 第26-43页 |
| ·Differences of lead-ins | 第26-33页 |
| ·The proportion of lead-in to the whole class | 第26-28页 |
| ·The rate of speech of teacher talk in lead-ins | 第28-30页 |
| ·The ratio of type-token of teacher talk of lead-ins | 第30-31页 |
| ·The ratio of teacher talk and student talk of lead-in | 第31-33页 |
| ·Features of lead-ins from the quantitative results | 第33-43页 |
| ·Conciseness | 第34页 |
| ·Applicability | 第34-38页 |
| ·Interactivity | 第38-43页 |
| Chapter Ⅴ Conclusion | 第43-48页 |
| ·Main findings | 第43-45页 |
| ·Limitations of present study | 第45-46页 |
| ·Suggestions for future study | 第46-48页 |
| References | 第48-51页 |
| Acknowledgements | 第51页 |
