| 摘要 | 第1-5页 |
| Abstract | 第5-9页 |
| Chapter One Introduction | 第9-12页 |
| ·Background of the Research | 第9-10页 |
| ·Motivation and Significance of the Research | 第10-11页 |
| ·Layout of this Thesis | 第11-12页 |
| Chapter Two Literature Review | 第12-24页 |
| ·Definition and Characteristic of Lexical Chunks | 第12-14页 |
| ·Definition of lexical chunks | 第12-13页 |
| ·Characteristics of lexical chunks | 第13-14页 |
| ·Classification of Lexical Chunks | 第14-18页 |
| ·Classification from the structural perspective | 第14-17页 |
| ·Classification from the functional perspective | 第17-18页 |
| ·Main Ideas of the Lexical Approach | 第18-22页 |
| ·Lexicalised grammar and grammaticalized lexis | 第18页 |
| ·Language acquisition | 第18-19页 |
| ·Language production | 第19页 |
| ·Collocation | 第19-21页 |
| ·Difference between lexical chunks and collocations | 第21页 |
| ·Lexical density | 第21-22页 |
| ·Previous Studies on English News Broadcasts | 第22-23页 |
| ·Summary | 第23-24页 |
| Chapter Three Research Methodology | 第24-28页 |
| ·Research Questions | 第24页 |
| ·Collection of News Broadcasts | 第24-25页 |
| ·Identification of Lexical Chunks | 第25-26页 |
| ·Procedure | 第26-28页 |
| Chapter Four Results and Discussion | 第28-38页 |
| ·The Use of Lexical Chunks in Different Topics | 第28-31页 |
| ·General characteristics of lexical chunks in different topics | 第29-30页 |
| ·Explanations of the characteristics | 第30-31页 |
| ·The Use of the four Structural Categories | 第31-37页 |
| ·The use of phrasal constraints in different news topics | 第31-34页 |
| ·The use of sentence builders in different news topics | 第34页 |
| ·The use of polywords in different news topics | 第34-37页 |
| ·The use of institutionalized expressions in different news topics | 第37页 |
| ·Summary | 第37-38页 |
| Chapter Five Conclusion | 第38-42页 |
| ·Summary of the Study | 第38页 |
| ·Pedagogical Implications | 第38-40页 |
| ·Suggestions to English teachers | 第39页 |
| ·Suggestions to second language learners | 第39-40页 |
| ·Limitations and Suggestions | 第40-42页 |
| References | 第42-44页 |
| Appendices | 第44-56页 |
| Acknowledgements | 第56-57页 |
| 攻读硕士期间发表论文情况 | 第57页 |
