声明
摘要
ABSTRACT
List of Abbreviations
Contents
Chapter 1 Introduction
1．1 Research Background
1．2 Research Objectives and Significance
1．3 Layout of This Study
Chapter 2 Literature Review
2．1 Readability
2．1．1 Definitions of Readability
2．1．2 Impact Factors on Readability
2．2 The Classic Readability Studies
2．2．1 Text Leveling
2．2．2 The Vocabulary-frequency Lists
2．2．3 The Readability Formulas
Chapter 3 Research Methodology
3．1 Corpus and Corpus-based Approach
3．2 Tools for Data Collection
3．2．1 Perl
3．2．2 AntConc3．2．0w
3．2．3 SPSS11．5
3．2．4 Gotagger
3．3 Procedures for Data Collection and Analysis
3．3．1 Processing of BNC Files
3．3．2 Processing of NEC Text
Chapter 4 Data Analysis
4．1 Contrastive Study of Readability on Lexical Level
4．1．1 Readability Analysis Based on Word Length
4．1．2 Readability Analysis Based on Word Frequency
4．1．3 Readability Analysis Based on the Number of Polysyllabic Words
4．1．4 Readabifity Analysis Based on the Number of Uncommon Words
4．2 Contrastive Study of Readability on Syntactic Level
4．2．1 Readability Analysis Based on Sentence Length in Words
4．2．2 Readability Analysis Based on Structure Density of Prepositional Phrases
Chapter 5 Conclusion
5．1 Major Findings of the Research
5．2 Implications of the Research
5．3 Limitations and Suggestions for Future Research
5．3．1 Limitations of the Research
5．3．2 Suggestions for Future Research
References
Appendix
Acknowledgements
Resume
