| ACKNOWLEDGEMENTS | 第1-5页 |
| ABSTRACT | 第5-8页 |
| 摘要 | 第8-10页 |
| LIST OF FIGURES AND TABLES | 第10-11页 |
| ABBREVIATIONS | 第11-16页 |
| CHAPTER ONE INTRODUCTION | 第16-21页 |
| ·Research Background | 第16-18页 |
| ·Significance of the Research | 第18-19页 |
| ·Research Questions | 第19页 |
| ·Layout of the Research | 第19-21页 |
| CHAPTER TWO LITERATURE REVIEW | 第21-35页 |
| ·Lexical Features and Quality of Writing | 第21-26页 |
| ·Indices for lexical features | 第21-24页 |
| ·Tool for lexical indices measurement | 第24页 |
| ·Impacts of lexical features on quality of writing | 第24-26页 |
| ·Syntactic Features and Quality of Writing | 第26-30页 |
| ·Indices for syntactic features | 第26-28页 |
| ·Tool for syntactic indices measurement | 第28-29页 |
| ·Impacts of syntactic features on quality of writing | 第29-30页 |
| ·Cohesive Features and Quality of Writing | 第30-34页 |
| ·Indices for cohesive features | 第30-32页 |
| ·Tool for cohesive indices measurement | 第32-33页 |
| ·Impacts of cohesive features on quality of writing | 第33-34页 |
| ·Summary | 第34-35页 |
| CHAPTER THREE METHODOLOGY | 第35-45页 |
| ·Composition Collection | 第35-36页 |
| ·Tools | 第36-40页 |
| ·Lexical Frequency Profile (LFP) | 第36-37页 |
| ·Coh-Metrix 3.0 | 第37-39页 |
| ·L2 Syntactic Complexity Analyzer | 第39-40页 |
| ·Variables | 第40-44页 |
| ·Dependent variables | 第40页 |
| ·Independent variables | 第40-44页 |
| ·Lexical variables | 第40-41页 |
| ·Syntactic variables | 第41-42页 |
| ·Cohesive variables | 第42-44页 |
| ·Data Analysis | 第44-45页 |
| CHAPTER FOUR DATA ANALYSIS AND RESULTS | 第45-62页 |
| ·Quantitative Differences in High- and Low- Proficiency Writings | 第45-53页 |
| ·Differences of lexical features in high- and low- proficiency writings | 第46-47页 |
| ·Differences of lexical features in high- and low- proficiency writings in CET4 | 第46-47页 |
| ·Differences of lexical features in high- and low- proficiency writings in CET6 | 第47页 |
| ·Differences of syntactic features in high- and low- proficiency Writings | 第47-50页 |
| ·Differences of syntactic features in high- and low- proficiency writings in CET4 | 第47-49页 |
| ·Differences of syntactic features in high- and low- proficiency writings in CET6 | 第49-50页 |
| ·Differences of cohesive features in high- and low- proficiency writings | 第50-52页 |
| ·Differences of cohesive features in high- and low- proficiency writings in CET4 | 第50-51页 |
| ·Differences of cohesive features in high- and low- proficiency writings in CET6 | 第51-52页 |
| ·Summary | 第52-53页 |
| ·Comparison between Quantitative Features of CET 4 and CET 6 Compositions | 第53-56页 |
| ·Impacts of Quantitative Features on Writing Quality | 第56-62页 |
| ·Correlational analysis | 第56-59页 |
| ·Impacts of lexical features on writing quality in CET4 and CET6 | 第56页 |
| ·Impacts of syntactic features on writing quality in CET4 | 第56-57页 |
| ·Impacts of syntactic features on writing quality in CET6 | 第57页 |
| ·Impacts of cohesive features on writing quality in CET4 | 第57-58页 |
| ·Impacts of cohesive features on writing quality in CET6 | 第58-59页 |
| ·Multiple regression | 第59-62页 |
| ·Regressional model of CET 4 compositions | 第59-60页 |
| ·Regressional model of CET 6 compositions | 第60-62页 |
| CHAPTER FIVE DICUSSION | 第62-67页 |
| ·Lexical Diversity and Writing Quality | 第62-63页 |
| ·Syntactic Complexity and Writing Quality | 第63-64页 |
| ·Textual Cohesion and Writing Quality | 第64-67页 |
| CHAPTER SIX CONCLUSION | 第67-73页 |
| ·Major Findings | 第67-68页 |
| ·Implications of the Study | 第68-70页 |
| ·Limitations of the Study | 第70-71页 |
| ·Directions for Further Studies | 第71-73页 |
| REFERENCES | 第73-77页 |
