| Abstract | 第1-6页 |
| Acknowledgement | 第6-9页 |
| Chapter 1 Introduction | 第9-13页 |
| 1．1 Prevalence of Code-switching | 第9-10页 |
| 1．2 Rationale of the Present Study | 第10-11页 |
| 1．3 Objectives of the Present Study | 第11页 |
| 1．4 Data Collection | 第11-12页 |
| 1．5 Organization of the Thesis | 第12-13页 |
| Chapter 2 Theoretical Background | 第13-37页 |
| 2．1 Introduction | 第13页 |
| 2．2 Definitions of Some Key Terms | 第13-17页 |
| 2．2．1 Introduction | 第13页 |
| 2．2．2 Defining Code-switching | 第13-15页 |
| 2．2．3 Defining Academic Classroom | 第15-17页 |
| 2．2．3．1 Characteristics of Academic Classroom | 第15-17页 |
| 2．3 Approaches to Code-switching | 第17-32页 |
| 2．3．1 Introduction | 第17页 |
| 2．3．2 Structural Approach | 第17-19页 |
| 2．3．3 Social Motivations for Code-switching | 第19-32页 |
| 2．3．3．1 Introduction | 第19-20页 |
| 2．3．3．2 Macro-level Analysis: Code-switching and Sociolinguistic Domains | 第20-22页 |
| 2．3．3．3 Micro-level Analysis: Code-switching and Conversation | 第22-26页 |
| 2．3．3．4 Code-switching and Communicative Accommodation Theory | 第26-30页 |
| 2．3．3．5 Discourse Functions of Code-switching | 第30-32页 |
| 2．4 Overview of Code-switching in the Foreign Language Classroom | 第32-37页 |
| Chapter 3 Theoretical Framework | 第37-51页 |
| 3．1 Introduction | 第37页 |
| 3．2 Description of the Markedness Model | 第37-46页 |
| 3．2．1 Nature of the Markedness Model | 第37-39页 |
| 3．2．2． Principle of the Markedness Model | 第39页 |
| 3．2．3． Components of the Markedness Model | 第39-42页 |
| 3．2．4 Motivations of Speakers under the Markedness Model | 第42-44页 |
| 3．2．5 The Markedness Model and the Evolution of Survival Mechanisms | 第44-46页 |
| 3．3 The Rational Choice Model | 第46-50页 |
| 3．3．1． The Markedness Model as a Rational Actor Model | 第46-48页 |
| 3．3．2 Modifying Elster's RA Model for the Markedness Model | 第48-50页 |
| 3．4 Summary | 第50-51页 |
| Chapter 4 Data Analysis | 第51-78页 |
| 4．1 Introduction | 第51页 |
| 4．2 Functional Approach to CS in Academic Classroom | 第51-58页 |
| 4．2．1 Code-switching for Emphasis | 第51-52页 |
| 4．2．2 Code-switching for Translation | 第52-53页 |
| 4．2．3 Code-switching for Clarification | 第53-54页 |
| 4．2．4 Code-switching to Initiate a New Topic | 第54-55页 |
| 4．2．5 Code-switching as a Repair of the Proceding Utterance | 第55-56页 |
| 4．2．6 Code-switching as Contrast | 第56-57页 |
| 4．2．7 Code-switching for Ease of Expression | 第57-58页 |
| 4．3 Characteristics of Code-switching in the Academic Classroom | 第58-60页 |
| 4．4 Motivation for Code-switching in the Academic Classroom | 第60-76页 |
| 4．4．1 Introduction | 第60-61页 |
| 4．4．2 How the Three Filters Operate for CS in the Academic Classroom | 第61-68页 |
| 4．4．2．1 When the First Filter Has its Effect | 第62-63页 |
| 4．4．2．2 Markedness versus Unmarkedness | 第63-65页 |
| 4．4．2．3 The Final Choice | 第65-68页 |
| 4．4．3 Negotiation of Rights and Obligations Set | 第68-73页 |
| 4．4．4 CS Practices in the Academic Classroom: Marked or Unmarked? | 第73-76页 |
| 4．5 Conclusion | 第76-78页 |
| Chapter 5 Discussions and Implications of this Study | 第78-80页 |
| 5．1 Significance of this Study | 第78-79页 |
| 5．2 Limitations of this Study | 第79-80页 |
| References: | 第80-89页 |
