| 摘要 | 第1-6页 |
| ABSTRACT | 第6-11页 |
| Chapter 1 Introduction | 第11-14页 |
| ·Research Background | 第11-12页 |
| ·Purpose and Significance of the Research | 第12页 |
| ·Research Questions | 第12-13页 |
| ·Layout of the Thesis | 第13-14页 |
| Chapter 2 Literature Review | 第14-35页 |
| ·Introduction to APEC | 第14页 |
| ·Reviews on Business Conference Speeches | 第14-19页 |
| ·Public Speaking | 第15页 |
| ·The Definition of Business Conference Speeches | 第15页 |
| ·Classifications of Business Conference Speeches | 第15-16页 |
| ·Criteria for Effective Business Conference Speeches | 第16-18页 |
| ·Previous Studies on Business Conference Speeches | 第18-19页 |
| ·Reviews on Presupposition | 第19-28页 |
| ·Philosophical Background of Presupposition | 第19-21页 |
| ·Semantic Presupposition | 第21-23页 |
| ·Pragmatic Presupposition | 第23-24页 |
| ·Functions of Pragmatic Presupposition | 第24-27页 |
| ·Previous Studies on Presupposition in Other Discourses | 第27-28页 |
| ·Reviews on Presupposition Triggers | 第28-35页 |
| ·Definition of Presupposition Triggers | 第28页 |
| ·Classifications of Presupposition Triggers by Different Scholars | 第28-33页 |
| ·Previous Studies on Presupposition Triggers in Other Discourses | 第33-35页 |
| Chapter 3 Research Methodology | 第35-38页 |
| ·Data Collection | 第35-36页 |
| ·Instruments | 第36页 |
| ·Research Methods | 第36-38页 |
| Chapter 4 Analysis and Discussion | 第38-69页 |
| ·The Functions of Pragmatic Presupposition in BCSs | 第38-44页 |
| ·The Function of Cohesion and Coherence | 第38-41页 |
| ·The Function of Informativeness | 第41-43页 |
| ·The Function of Economy | 第43-44页 |
| ·The Functions of PTs at Lexical Level in BCSs | 第44-63页 |
| ·Verbs as PTs and Their Function | 第45-55页 |
| ·Restrictive Expressions as PTs and Their Function | 第55-57页 |
| ·Iterative Particles as PTs and Their Function | 第57-60页 |
| ·Other Particles as PTs and Their Function | 第60-62页 |
| ·Chi-Square Test for the Significance of Various PTs at Lexical Level | 第62-63页 |
| ·The Functions of PTs at Syntactic Level in BCSs | 第63-69页 |
| ·Temporal Clauses as PTs and Their Function | 第63-65页 |
| ·Cleft Sentences as PTs and Their Function | 第65-66页 |
| ·Comparative Structures as PTs and Their Function | 第66-67页 |
| ·Non-restrictive Clauses as PTs and Their Function | 第67-69页 |
| Chapter 5 Conclusion | 第69-72页 |
| ·Major Findings | 第69-70页 |
| ·Implications of the Study | 第70-71页 |
| ·Limitations and Suggestions for Further Studies | 第71-72页 |
| References | 第72-75页 |
| Appendix Ⅰ Corpus of Business Conference Speeches | 第75-81页 |
| Appendix Ⅱ Frequency Data of Some PTs in CBCSs | 第81-87页 |
| Acknowledgements | 第87-88页 |
| Resume | 第88页 |
