| 摘要 | 第6-8页 |
| ABSTRACT | 第8-9页 |
| CHAPTER ONE INTRODUCTION | 第13-19页 |
| 1.1 Rearch Background | 第13-17页 |
| 1.2 Purpose and Significance of Present Study | 第17-18页 |
| 1.3 Organization of the Thesis | 第18-19页 |
| CHAPTER TWO THEORETICAL FOUNDATIONS | 第19-29页 |
| 2.1 Cohesion and Cohesive Devices | 第19-23页 |
| 2.1.1 Five Common Cohesive Ties Contributing to Cohesion | 第19-21页 |
| 2.1.2 Employment of Discourse Markers (DMs) in Expository Writing | 第21-23页 |
| 2.2 Coherence | 第23-25页 |
| 2.2.1 Text-Oriented Coherence | 第24-25页 |
| 2.2.2 Reader-Oriented Coherence | 第25页 |
| 2.3 Cohesion and Coherence Realized by DMs in Expository Writing | 第25-29页 |
| 2.3.1 DMs for Textual Cohesion as Cohesive Device | 第25-26页 |
| 2.3.2 DMs for Logical Connection as Conjunction | 第26-28页 |
| 2.3.3 DMs for Meaning Inference as Indicators | 第28-29页 |
| CHAPTER THREE RESEARCH DESIGN AND METHODOLOGY | 第29-34页 |
| 3.1 Research Questions | 第29页 |
| 3.2 Corpus-Data Collection Procedures | 第29-32页 |
| 3.2.1 Corpus Data Identification and Selection | 第30页 |
| 3.2.2 Target Data Grouping and Determination | 第30-32页 |
| 3.3 Corpus-Data Analysis Procedures | 第32-34页 |
| 3.3.1 DMs Selection and Categorization from Target Data | 第32-33页 |
| 3.3.2 Statistical Analysis of the Data | 第33-34页 |
| CHAPTER FOUR EXPOSITION WRITING QUALITY AFFECTED BY DMS | 第34-54页 |
| 4.1 DMs Contributing to Textual Cohesion | 第34-40页 |
| 4.1.1 Total Frequency of DMs in Both the Higher- and Lower-Score Group | 第35-36页 |
| 4.1.2 High Frequency of DMs for More Cohesive Writings in the Higher-Score Group | 第36-38页 |
| 4.1.3 Low Frequency of DMs for Less Cohesive Writings in the Lower-Score Group | 第38-40页 |
| 4.2 DMs Contributing to Logical Connection | 第40-48页 |
| 4.2.1 Category Distribution of DMs in Both the Higher- and Lower-Score Group | 第40-42页 |
| 4.2.2 Multi-Category Distribution DMs for More Logically Connected Writings in the Higher-Score Group | 第42-45页 |
| 4.2.3 Mono-Category Distribution DMs for Less Logically Connected Writings in the Lower-Score Group | 第45-48页 |
| 4.3 DMs Contributing to Meaning Inference | 第48-54页 |
| 4.3.1 Total Number of Inapproriate Use of DMs in Both the Higher- and Lower-Score Group | 第48-50页 |
| 4.3.2 Less Inappropriate Use of DMs as Inferential Promotion in the Higher-Score Group | 第50-52页 |
| 4.3.3 More Inappropriate Use of DMs as Inferential Impediment in the Lower-Score Group | 第52-54页 |
| CHAPTER FIVE CONCLUSION | 第54-57页 |
| 5.1 Major Findings of the Study | 第54-56页 |
| 5.2 Limitations and Some Suggestions for Further Research | 第56-57页 |
| BIBLIOGRAPHY | 第57-61页 |
| ACKNOWLEDGEMENTS | 第61-62页 |
| APPENDIX | 第62-67页 |
| PAPER(S)PUBLISHED DURING MA STUDIES | 第67页 |
