| Abstract | 第1-6页 |
| 摘要 | 第6-10页 |
| Chapter One Introduction | 第10-13页 |
| ·Background of the Study | 第10页 |
| ·Significance and Purpose of the Study | 第10-12页 |
| ·Layout of the structure | 第12-13页 |
| Chapter Two Literature Review | 第13-28页 |
| ·Concepts of Lexical Richness | 第13-18页 |
| ·Definition of Lexical Richness | 第13-17页 |
| ·The Notion of Frequency in Vocabulary Acquisition | 第17页 |
| ·Lexical Richness and the Levels of Frequency | 第17-18页 |
| ·Relevant Studies of Lexical Richness | 第18-24页 |
| ·Previous Empirical Studies on Lexical Richness Abroad | 第18-20页 |
| ·Previous Studies on Lexical Richness in China | 第20-24页 |
| ·Relevant studies of Lexical Meaning | 第24-28页 |
| ·Previous study on Lexical Meaning Abroad | 第24-26页 |
| ·Previous study on Lexical Meaning in China | 第26-28页 |
| Chapter Three Research Design | 第28-34页 |
| ·Research Questions | 第28页 |
| ·Data Collection | 第28-30页 |
| ·Research Subjects | 第28-29页 |
| ·Research Instruments | 第29-30页 |
| ·Dada Processing | 第30-31页 |
| ·Methods of Data Analysis | 第31-34页 |
| ·Data Analysis of Lexical Variation | 第31页 |
| ·Data Analysis of Lexical Density | 第31-32页 |
| ·Data Analysis of Lexical Sophistication | 第32页 |
| ·Data Analysis of Lexical Meaning | 第32-34页 |
| Chapter Four Data Analysis and Discussion | 第34-56页 |
| ·Data Analysis of Lexical Richness | 第34-49页 |
| ·Data analysis of Lexical Variation | 第34-39页 |
| ·Data Analysis of Lexical Density | 第39-44页 |
| ·Data Analysis of Lexical Sophistication | 第44-49页 |
| ·Data Analysis of Lexical Meaning | 第49-53页 |
| ·Discussion | 第53-56页 |
| Chapter Five Conclusion | 第56-59页 |
| ·Major Findings and Possible Reasons | 第56-58页 |
| ·Limitations of this Study and Suggestions for Further Studies | 第58-59页 |
| Bibliography | 第59-63页 |
| Appendix I | 第63-65页 |
| Appendix II | 第65-71页 |
| Acknowledgements | 第71页 |
