ACKNOWLEDGMENTS
ABSTRACT
摘要
CONTENTS
List of Tables
Chapter 1 Introduction
1.1 Research background
1.2 Purpose and significance
1.3 Structure of the thesis
Chapter 2 Literature Review
2.1 Vocabulary knowledge and reading comprehension
2.2 Unknown vocabulary density and lexical coverage
2.2.1 The definition of unknown vocabulary density
2.2.2 Assumptions about desirable and undesirable densities
2.3 The optimum coverage level
2.4 Relevant studies at home and abroad
Chapter 3 Research Methodology
3.1 Research questions
3.2 Subjects
3.3 Instrument
3.4 Research procedure
3.5 Data collection and analysis
Chapter 4 Results and discussion
4.1 The effect of unknown vocabulary density on reading comprehension
4.2 The optimum unknown vocabulary density for high school students In English reading comprehension
4.3 The effect of unknown vocabulary density on understanding different reading comprehension question types
4.3.1 The effect of unknown vocabulary density on understanding questions about local coherence
4.3.2 The effect of unknown vocabulary density on understanding questions about macrostructure of the text
Chapter 5 Conclusion
5.1 Major findings of this study
5.2 Implications
5.3 Limitations
REFERENCES
APPENDICES
攻读学位期间发表的学术论文目录
声明