声明
Acknowledgements
Abstract
摘要
List of Abbreviations
List of Tables and Figures
Table of Contents
Chapter One Introduction
1.1 General description of the study
1.2 Motivations for the study
1.3 Significance of the study
1.4 Overall structure of thesis
Chapter Two Literature Review
2.1 Key terms in this study
2.1.1 Lexical richness
2.1.2 Lexicai density
2.1.3 Lexical variation
2.1.4 Lexical sophistication
2.2 Theoretical foundations in this study
2.2.1 Interlanguage theory
2.2.2 Output hypothesis
2.3 Previous studies on lexieal richness abroad and in China
2.3.1 Previous studies on lexical richness abroad
2.3.2 Previous studies on lexical richness in China
Chapter Three Methodology
3.1 Research questions
3.2 Research design
3.2.1 Corpus description
3.2.2 Data collection
3.2.3 Data analysis
Chapter Four Results and Discussion
4.1 Developmental patterns of lexical richness in English majors’ argumentative writing in terms of lexical density
4.2 Developmental patterns of lexical richness in English majors’ argumentative writing in terms of lexieal variation
4.3 Developmental patterns of lexical richness in English majors’ argumentative writing in terms of lexical sophistication
Chapter Five Conclusion
5.1 Major findings of the study
5.2 Pedagogical implications
5.3 Limitations and suggestions for further studies
References