| ACKNOWLEDGEMENTS | 第1-5页 |
| 摘要 | 第5-7页 |
| ABSTRACT | 第7-15页 |
| Chapter One INTRODUCTION | 第15-19页 |
| ·Background of the Study | 第15-17页 |
| ·Purpose of the Present Study | 第17页 |
| ·Significance of the Present Study | 第17-18页 |
| ·Outline of the Dissertation | 第18-19页 |
| Chapter Two LITERATURE REVIEW | 第19-41页 |
| ·Introduction | 第19页 |
| ·Input Modality in Learning | 第19-28页 |
| ·Modality in General Learning | 第19-23页 |
| ·Modality in General Learning and Language Learning | 第23-25页 |
| ·Input Modality and Second Language Comprehension | 第25-28页 |
| ·Frequency in Second Language Learning | 第28-39页 |
| ·Significance of Frequency in Language Learning | 第29-31页 |
| ·Major Disputes about Frequency | 第31-34页 |
| ·Task Frequency | 第34-36页 |
| ·Modality and Task Frequency in Second Language Comprehension | 第36-39页 |
| ·Summary | 第39-41页 |
| Chapter Three RESEARCH METHODS | 第41-51页 |
| ·Research Questions | 第41-42页 |
| ·Participants | 第42-45页 |
| ·Research Procedures | 第45-46页 |
| ·Experimental Material | 第46-47页 |
| ·Assessment Instruments | 第47-49页 |
| ·Language Proficiency Test | 第47页 |
| ·Recall Protocol and Scoring Criteria | 第47-48页 |
| ·Questionnaires | 第48-49页 |
| ·Pilot Study | 第49页 |
| ·Analysis of Data | 第49-50页 |
| ·Summary | 第50-51页 |
| Chapter Four RESULTS AND DISCUSSIONS | 第51-69页 |
| ·Research Question One: Input Modality and Second Language Comprehension | 第51-56页 |
| ·Data Analysis of the Effect of Input Modalities | 第51-53页 |
| ·Discussion on the Effect of Input Modalities | 第53-56页 |
| ·Research Question Two: Task frequency and Comprehension | 第56-61页 |
| ·Data Analysis of the Effect of Task Frequency | 第56-57页 |
| ·Discussion on the Effect of Task Frequency | 第57-61页 |
| ·Research Question Three: Interaction of Input Modality and Task Frequency | 第61-66页 |
| ·Data Analysis of the Interaction between Input Modality and Task Frequency | 第61-62页 |
| ·Discussion on the Interaction between Input Modality and Task Frequency | 第62-66页 |
| ·Summary | 第66-69页 |
| Chapter Five CONCLUSION | 第69-75页 |
| ·Major Findings | 第69-70页 |
| ·Implications | 第70-71页 |
| ·Limitations of the Study and Suggestions | 第71-75页 |
| REFERENCES | 第75-87页 |
| Appendices | 第87-101页 |
| Appendix Ⅰ Instructions for Experiment | 第87-89页 |
| Appendix Ⅱ Background Questionnaire | 第89-90页 |
| Appendix Ⅲ Experimental Material | 第90-91页 |
| Appendix Ⅳ Recall Criterion | 第91-92页 |
| Appendix Ⅴ Questionnaires | 第92-101页 |
| 附录：作者在攻读硕士学位期间发表的论文 | 第101页 |
