| Acknowledgments | 第1-6页 |
| Abstract | 第6-8页 |
| 摘要 | 第8-16页 |
| Chapter 1 Introduction | 第16-22页 |
| ·Background of the research | 第16-17页 |
| ·Research purposes | 第17-18页 |
| ·Significance of the research | 第18-20页 |
| ·Structure of the thesis | 第20-22页 |
| Chapter 2 Literature Review | 第22-32页 |
| ·Definitions of assignment | 第22-23页 |
| ·Researches on quantity of assignments abroad | 第23-29页 |
| ·Researches on quantity of assignments at home | 第29-31页 |
| ·Enlightenment of Previous Research | 第31-32页 |
| Chapter 3 Theoretical Basis | 第32-37页 |
| ·Physiological theories | 第32-33页 |
| ·Thorndike connection theory of learning | 第33-34页 |
| ·The forgetting theory of Ebbinghaus | 第34-37页 |
| Chapter 4 Research Methodology | 第37-43页 |
| ·Questions | 第37页 |
| ·Participants | 第37-38页 |
| ·Instruments | 第38-39页 |
| ·Assignment strategy | 第39-40页 |
| ·Length of the study | 第40页 |
| ·Data-collection and Data –analysis | 第40-41页 |
| ·The correction of assignments | 第41-43页 |
| Chapter 5 Results and Discussions | 第43-78页 |
| ·Assignment efficiency assessment of the subjects | 第43-46页 |
| ·Statistics analysis of participants initial academic performance | 第46-51页 |
| ·Statistics analysis of participants total admission scores of all subjects | 第46-48页 |
| ·Statistics analysis of admission scores of English | 第48-50页 |
| ·Statistics analysis on participants pretest scores | 第50-51页 |
| ·Influences of the variable of assignment on test scores in the first stage | 第51-63页 |
| ·Test scores analysis after a 60-minute period | 第51-53页 |
| ·Test scores analysis after a 70-minute period | 第53-54页 |
| ·Test scores analysis after a 80-minute period | 第54-56页 |
| ·Test scores analysis after a 90-minute period | 第56-57页 |
| ·Test scores analysis after a 100-minute period | 第57-58页 |
| ·Test scores analysis after a 110-minute period | 第58-60页 |
| ·Independent samples T-test on the test scores after a 120-minuteperiod | 第60-61页 |
| ·Analysis on the test scores after a second 120-minute period | 第61-63页 |
| ·Influences of the variable of assignment on test scores in the second stage | 第63-67页 |
| ·Independent samples t-test on the scores after a 130-minutes period | 第63-64页 |
| ·Analysis on the test scores after a second 130-minute period | 第64-65页 |
| ·Analysis on the test scores after a third 130-minute period | 第65-67页 |
| ·Post-experimental statistics analysis of participants academic performance | 第67-72页 |
| ·Analysis on the experimental class test scores of the second 52120-minute period and the third 130-minute period | 第67-69页 |
| ·Independent samples test on the post-test scores between the two classes | 第69-71页 |
| ·Paired samples test on the pre-test and post-test scores of the experimental class | 第71-72页 |
| ·Scores analysis of 2011 PETS level One | 第72-74页 |
| ·Correlation between the quantity of assignments and scores | 第74-78页 |
| ·Trend analysis for achievement and various quantities of assignments | 第74-76页 |
| ·Correlation analysis | 第76-78页 |
| Chapter 6 Conclusions | 第78-82页 |
| ·Major findings | 第78-79页 |
| ·Implications of the study | 第79页 |
| ·Limitations of the study and suggestions for further research | 第79-82页 |
| References | 第82-87页 |
| Appendices | 第87-95页 |
| AppendixⅠ Comparison Table for Time and Assignment | 第87-88页 |
| AppendixⅡ Periodical Assignment | 第88-90页 |
| Appendix Ⅲ Periodical Paper（Week 10） | 第90-94页 |
| Appendix Ⅳ Pre-test and Post-test scores of the two classes | 第94-95页 |
