| Acknowledgements | 第5-6页 |
| 摘要 | 第6-8页 |
| Abstract | 第8-10页 |
| Chapter 1 Introduction | 第16-21页 |
| 1.1 Brief Introduction of TEM-4 and TEM-8 | 第16-17页 |
| 1.2 Aims, Significance and Organization of This Thesis | 第17-19页 |
| 1.2.1 Aims of This Thesis | 第17-18页 |
| 1.2.2 Significance of This Thesis | 第18-19页 |
| 1.2.3 Organization of This Thesis | 第19页 |
| 1.3 Research Questions | 第19-20页 |
| 1.4 Summary | 第20-21页 |
| Chapter 2 Literature Review | 第21-39页 |
| 2.1 Reading Comprehension | 第21-23页 |
| 2.1.1 Definition of Reading Comprehension | 第21-22页 |
| 2.1.2 Former Studies about Reading Comprehension | 第22-23页 |
| 2.2 Lexical Richness | 第23-29页 |
| 2.2.1 Definition of Lexical Richness | 第24-25页 |
| 2.2.2 Measures of Lexical Richness | 第25-29页 |
| 2.3 Text Readability | 第29-35页 |
| 2.3.1 Definition of Readability | 第30-31页 |
| 2.3.2 Measures of Readability | 第31-35页 |
| 2.4 Text Easability | 第35-38页 |
| 2.4.1 Introduction of Text Easability Principal Components | 第35-36页 |
| 2.4.2 Components of Text Easability | 第36-38页 |
| 2.5 Summary | 第38-39页 |
| Chapter 3 Research Methodology | 第39-44页 |
| 3.1 Research Object | 第39-40页 |
| 3.2 Research Instruments | 第40-43页 |
| 3.2.1 RANGE | 第40-41页 |
| 3.2.2 Coh-Metrix Version 3.0 | 第41-43页 |
| 3.3 Summary | 第43-44页 |
| Chapter 4 Analyses of Lexical Features | 第44-71页 |
| 4.1 Analyses of Lexical Variation | 第44-54页 |
| 4.1.1 Lexical Variation of TEM-4 Reading Texts | 第44-48页 |
| 4.1.2 Lexical Variation of TEM-8 Reading Texts | 第48-51页 |
| 4.1.3 Comparison of Lexical Variation between TEM-4 and TEM-8 Reading Texts36 | 第51-53页 |
| 4.1.4 Summary | 第53-54页 |
| 4.2 Analyses of Word Frequency | 第54-71页 |
| 4.2.1 Word Frequency of TEM-4 Reading Texts | 第54-61页 |
| 4.2.2 Word Frequency of TEM-8 Reading Texts | 第61-66页 |
| 4.2.3 Comparison of Word Frequency between TEM-4 and TEM-8 Reading Texts51 | 第66-70页 |
| 4.2.4 Summary | 第70-71页 |
| Chapter 5 Analyses of Contextual Features | 第71-83页 |
| 5.1 Analyses of Text Readability | 第71-76页 |
| 5.1.1 Readability of TEM-4 Reading Texts | 第71-74页 |
| 5.1.2 Readability of TEM-8 Reading Texts | 第74-75页 |
| 5.1.3 Comparison of Readability between TEM-4 and TEM-8 Reading Texts | 第75-76页 |
| 5.2 Analyses of Text Easability Principal Components | 第76-81页 |
| 5.2.1 Principal Components Analyses of TEM-4 Reading Texts | 第76-77页 |
| 5.2.2 Principal Components Scores of TEM-8 Reading Texts | 第77-79页 |
| 5.2.3 Comparison of Text Easability Principal Components | 第79-81页 |
| 5.3 Summary | 第81-83页 |
| Chapter 6 Findings and Conclusion | 第83-89页 |
| 6.1 Research Findings | 第83-85页 |
| 6.2 Discussion of Results | 第85-87页 |
| 6.3 Suggestions towards Text Assessment | 第87页 |
| 6.4 Research Limitations | 第87-89页 |
| Bibliography | 第89-94页 |
| Appendix Ⅰ Indices in the Coh-Metrix 3.0 | 第94-98页 |
| Papers Published During the Study for M. A. Degree | 第98页 |
