| Acknowledgements | 第1-6页 |
| 中文摘要 | 第6-7页 |
| Abstract | 第7-11页 |
| 1. Introduction | 第11-15页 |
| ·Research background | 第11-12页 |
| ·Research significance | 第12-13页 |
| ·Research methodology | 第13页 |
| ·Organization of the paper | 第13-15页 |
| 2. Literature Review | 第15-22页 |
| ·The definition of classroom lead-in | 第15页 |
| ·Previous studies conducted at home and abroad | 第15-18页 |
| ·The function and significance of classroom lead-in | 第16-17页 |
| ·The approaches of classroom lead-in | 第17页 |
| ·Basic requirements of lead-in | 第17-18页 |
| ·Theoretical basis of lead-in | 第18-22页 |
| ·Constructivism Learning Theory | 第18-20页 |
| ·Krashen's Input and Affective Filter Hypothesis | 第20-22页 |
| 3. The Strategies for Optimizing the Classroom Lead-in Approaches | 第22-47页 |
| ·Some representative traditional lead-in approaches | 第22-24页 |
| ·Straightforward lead-in approaches | 第22-23页 |
| ·Revision lead-in approaches | 第23页 |
| ·Casual talk lead-in approach | 第23-24页 |
| ·The limitations of the traditional lead-in approaches | 第24-26页 |
| ·The monotony of lead-in approach | 第25页 |
| ·The ignorance of students' subjectivity | 第25-26页 |
| ·The procrastination in lead-in link | 第26页 |
| ·The implementation of optimized lead-in approaches in higher vocational college English classroom | 第26-47页 |
| ·The introduction of the teaching material | 第26-29页 |
| ·Some popular and practical lead-in approaches | 第29-47页 |
| 4. Research Methodologies | 第47-51页 |
| ·Research design | 第47页 |
| ·Objectives | 第47-48页 |
| ·Subjects description | 第48页 |
| ·Instruments | 第48-49页 |
| ·Classroom observation | 第48页 |
| ·Interview | 第48-49页 |
| ·Questionnaire | 第49页 |
| ·Procedures | 第49-51页 |
| 5. Results and Discussion | 第51-59页 |
| ·Data collection and data presentation | 第51-54页 |
| ·Classroom observation | 第51页 |
| ·Interview | 第51-52页 |
| ·Questionnaire | 第52-54页 |
| ·Results and analysis | 第54-59页 |
| ·Which is the most interesting lead-in approach? | 第54-56页 |
| ·Which is the most feasible lead-in approach? | 第56-57页 |
| ·What are students' other expectation for better lead-in? | 第57-59页 |
| 6. Conclusion | 第59-63页 |
| ·Major findings | 第59-61页 |
| ·Implications | 第61-62页 |
| ·Some limitations in the research | 第62页 |
| ·Suggestions for further researches | 第62-63页 |
| Bibliography | 第63-65页 |
| Appendix Ⅰ Students' Interview Questions | 第65-66页 |
| Appendix Ⅱ Questionnaires | 第66-67页 |
