| Acknowledgments | 第5-10页 |
| Abstract | 第10页 |
| 摘要 | 第11-12页 |
| ChapterⅠ.Introduction | 第12-16页 |
| 1.1 Research background | 第12-13页 |
| 1.2 The role corpora play in textbook vocabulary acquisition researches | 第13-14页 |
| 1.3 Purpose and significance of this study | 第14-15页 |
| 1.4 Outline of the present study | 第15-16页 |
| Chapter Ⅱ.Literature review | 第16-31页 |
| 2.1 Voeabulary acquisition | 第16-18页 |
| 2.1.1 Studies on vocabulary in the textbooks from the points of SLA theories | 第16-17页 |
| 2.1.2 Ways to count in vocabulary acquisition | 第17-18页 |
| 2.2 Input and textbooks | 第18-19页 |
| 2.3 Lexical frequencies and complexity | 第19-24页 |
| 2.3.1 The defmition of lexical frequency and complexity | 第19-20页 |
| 2.3.2 The importance of frequency in vocabulary acquisition | 第20-21页 |
| 2.3.3 Studies on Lexical Frequeney and lexical coverage | 第21-23页 |
| 2.3.4 Studies on lexical complexity | 第23-24页 |
| 2.4 Corpus-based analysis of textbook vocabulary abroad | 第24-28页 |
| 2.5 Corpus-based analysis of textbook vocabulary at home | 第28-29页 |
| 2.6 Research questions of the study | 第29-31页 |
| Chapter Ⅲ Research design | 第31-37页 |
| 3.1 Introduction to the coursebook Go for it | 第31页 |
| 3.2 Text materials | 第31-33页 |
| 3.3 Analytical Tools | 第33-35页 |
| 3.4 Procedures | 第35-37页 |
| ChapterⅣ Results and Data Analysis | 第37-68页 |
| 4.1 General pattern of vocabulary frequency distribution | 第37-40页 |
| 4.2 Vocabulary frequency:overall patterns | 第40-44页 |
| 4.3 Vocabulary frequency:individual unit | 第44-47页 |
| 4.4 Word frequency of target vocabularies in each unit | 第47-53页 |
| 4.5 Lexical complexity | 第53-61页 |
| 4.6 Word class distribution | 第61-68页 |
| ChapterⅤ Discussion | 第68-76页 |
| 5.1 The general distribution pattern | 第68页 |
| 5.2 Vocabulary frequency levels | 第68-70页 |
| 5.3 Lexical complexity:the issue of genre features | 第70-73页 |
| 5.4 Top fifty words distribution | 第73-76页 |
| ChapterⅥ Conclusion | 第76-80页 |
| 6.1 Major findings of the present study | 第76-77页 |
| 6.2 Implications of the study | 第77-78页 |
| 6.3 Limitations and suggestions for further study | 第78-80页 |
| References | 第80-84页 |
