| Contents | 第3-6页 |
| List of Tables | 第6-7页 |
| Abstract | 第7-8页 |
| 摘要 | 第9-10页 |
| Chapter 1 Introduction | 第10-14页 |
| 1.1 The Background of the Study | 第10-11页 |
| 1.2 The Significance of the Study | 第11-12页 |
| 1.3 Thesis Structure | 第12-14页 |
| Chapter 2 Literature Review | 第14-26页 |
| 2.1 Language Learning Theories Concerning Bilingualism andTrilingulism | 第14-17页 |
| 2.1.1 Theories about Bilingualism and Trilingualism | 第14-15页 |
| 2.1.2 Studies of Bilingualism and Trilingualism | 第15-17页 |
| 2.2 Practices of Bilingual and Trilingual Education in China | 第17-19页 |
| 2.3 Self-concept and Academic Self-concept | 第19-26页 |
| 2.3.1 Definitions of Self-concept | 第19-20页 |
| 2.3.2 Definitions of Academic Self-concept | 第20-21页 |
| 2.3.3 Studies of Self-concept | 第21-22页 |
| 2.3.4 Studies of Academic Self-concept | 第22-26页 |
| 2.3.4.1 Reciprocal Relations between Academic Achievement and Academic Self-concept | 第22-23页 |
| 2.3.4.2 Effects in the Formation of Academic Self-concept | 第23-26页 |
| Chapter 3 Research Design and Methodology | 第26-30页 |
| 3.1 Research Questions | 第26页 |
| 3.2 Research Subjects | 第26-27页 |
| 3.3 Data Collection Instruments | 第27-28页 |
| 3.4 Data Collection Procedures | 第28页 |
| 3.5 Data Analysis Procedures | 第28-30页 |
| Chapter 4 Results and Discussions | 第30-51页 |
| 4.1 Questionnaire Data Analysis | 第30-46页 |
| 4.1.1 Language of Ethnic Minority | 第30-31页 |
| 4.1.1.1 Spoken Language of Ethnic Minority | 第30-31页 |
| 4.1.1.2 Written Scripts | 第31页 |
| 4.1.2 Language and Culture Maintenance | 第31-32页 |
| 4.1.3 Bilingual/trilingual Education Experiences | 第32-35页 |
| 4.1.3.1 Bilingual Experiences | 第32-34页 |
| 4.1.3.2 English Learning Experiences | 第34-35页 |
| 4.1.4 Students' English Learning Performance | 第35-38页 |
| 4.1.4.1 Attitudes towards English | 第35-36页 |
| 4.1.4.2 English Learning Activities | 第36-38页 |
| 4.1.5 Students' English Proficiency | 第38-41页 |
| 4.1.5.1 Profile of L3 Outcomes | 第38页 |
| 4.1.5.2 Impacts of Bai Students' Ethnic Minority Language on Their English Outcomes | 第38-40页 |
| 4.1.5.3 Impacts of Bai Students' Han Proficiency on Their English Outcomes | 第40页 |
| 4.1.5.4 Impacts of Bai Students' Bilingual Experiences on Their Translation Tests | 第40-41页 |
| 4.1.6 Students' Views on Bilingual/trilingual Experiences | 第41-45页 |
| 4.1.7 Students' Opinions on English Teachers | 第45-46页 |
| 4.2 Interview Results Analysis | 第46-51页 |
| 4.2.1 Negative Self-concept Resulting from Inferiority | 第47-48页 |
| 4.2.2 Negative Self-concept Resulting from Comparison with Classmates | 第48-49页 |
| 4.2.3 Positive Self-concept Resulting from Teachers' Attitudes | 第49-51页 |
| Chapter 5 Conclusion and Suggestions | 第51-54页 |
| 5.1 Major findings | 第51-52页 |
| 5.2 Limitations | 第52-53页 |
| 5.3 Suggestions for Future Research | 第53-54页 |
| Appendix Ⅰ Questionnaire for Bai Students | 第54-61页 |
| Appendix Ⅱ Possible Questions for the Interview | 第61-62页 |
| Appendix Ⅲ Transcription of the Interview Results | 第62-63页 |
| References | 第63-67页 |
| AcknowIedgements | 第67页 |
