| 摘要 | 第1-7页 |
| Abstract | 第7-12页 |
| 1 Introduction | 第12-17页 |
| ·Background of the Study | 第12-15页 |
| ·The importance of writing | 第12-13页 |
| ·The limitations of the current writing teaching approaches in senior middle school | 第13-15页 |
| ·The aim and significance of the study | 第15页 |
| ·Structure of the thesis | 第15-17页 |
| 2 Literature review | 第17-37页 |
| ·The definition of lexical chunks | 第17-20页 |
| ·The classification of lexical chunks | 第20-22页 |
| ·Nattinger & Decarrico's classification | 第20-21页 |
| ·Lewis' classification | 第21-22页 |
| ·The function of lexical chunks | 第22-24页 |
| ·Lexical chunks-based teaching approaches | 第24-28页 |
| ·Lexical approach | 第25-26页 |
| ·Lexical phrase approach | 第26-28页 |
| ·Studies on lexical chunks aboard and home | 第28-31页 |
| ·Studies on lexical chunks aboard | 第28-30页 |
| ·Studies on lexical chunks home | 第30-31页 |
| ·Theoretical foundations for this study | 第31-35页 |
| ·The comprehensible input hypothesis and the affective filter hypothesis | 第31-32页 |
| ·Chunking theory | 第32-34页 |
| ·Lexical chunks in language acquisition | 第34-35页 |
| ·Summary | 第35-37页 |
| 3 Research design | 第37-48页 |
| ·Subjects | 第37页 |
| ·Research hypothesis | 第37-38页 |
| ·Instruments | 第38-39页 |
| ·Composition tests | 第38页 |
| ·Questionnaire | 第38页 |
| ·Interview | 第38-39页 |
| ·Research procedure | 第39页 |
| ·The instructional treatment to two classes | 第39-48页 |
| ·Instructional treatment to me experimental class | 第39-47页 |
| ·Instructional treatment to the controlled class | 第47-48页 |
| 4 Data analsis and the discussion | 第48-65页 |
| ·Results analysis for the composition tests | 第48-60页 |
| ·The comparison of students' scores of pretest between two classes | 第48-49页 |
| ·The comparison of students' Scores of posttest between two classes | 第49-51页 |
| ·The paired samples statistics of the composition scores of EC | 第51-52页 |
| ·The paired samples of staties of the composition scores of CC | 第52-53页 |
| ·The comparison of students'use of lexical chunks in the pretest between two classes | 第53-54页 |
| ·The comparison of students'use of lexical chunks in the posttest between two classes | 第54-56页 |
| ·The paired samples statistics of lexical chunks used in the compositions of EC | 第56页 |
| ·The paired samples statistics of lexical chunks used in the tompositions of CC | 第56-58页 |
| ·Summary | 第58-60页 |
| ·Results analysis for the questionnaire | 第60-62页 |
| ·The students' attitude toward the lexical approach | 第60页 |
| ·The role of the lexical chunks in students' opinions | 第60-61页 |
| ·The difficulties the students meet in the process of learning lexical chunks | 第61-62页 |
| ·Results analysis for the interview | 第62-65页 |
| 5 Conclusion | 第65-69页 |
| ·Major Findings | 第65-67页 |
| ·Pedagogical Implications | 第67-68页 |
| ·Limitations of the study and recommendations for future research | 第68-69页 |
| Bibliography | 第69-72页 |
| Appendix Ⅰ | 第72-73页 |
| Appendix Ⅱ | 第73-74页 |
| Appendix Ⅲ | 第74-75页 |
| Appendix Ⅳ | 第75-76页 |
| Appendix Ⅴ | 第76-78页 |
| Acknowledgments | 第78-79页 |
| 附录：作者在攻读硕士学位期间发表的论文 | 第79页 |
