| Acknowledgements | 第1-5页 |
| Academic Achievements | 第5-6页 |
| 摘要 | 第6-7页 |
| Abstract | 第7-11页 |
| Chapter One Introduction | 第11-15页 |
| ·Research background | 第11-13页 |
| ·Research significance | 第13页 |
| ·Organization of the thesis | 第13-15页 |
| Chapter Two Literature Review | 第15-25页 |
| ·Political discourse and its Critical Discourse Analysis | 第15-20页 |
| ·Conceptualization, mainstream approaches and top concerns | 第15-18页 |
| ·Previous studies at home and abroad | 第18-20页 |
| ·National identity and discursive identity | 第20-25页 |
| ·National identity as a focus concept | 第20-21页 |
| ·Discursive identity as a suitable research lens | 第21-22页 |
| ·Previous studies at home and abroad | 第22-25页 |
| Chapter Three Research Methodology | 第25-35页 |
| ·Research design | 第25-27页 |
| ·An integrated CDA framework | 第27-31页 |
| ·Three-dimension model | 第27-29页 |
| ·Three meta-functions | 第29-31页 |
| ·Data collection | 第31-33页 |
| ·Analytic procedure | 第33-35页 |
| Chapter Four Results and Discussion | 第35-51页 |
| ·Discursive identity of USA as a multi-faceted nation | 第35-45页 |
| ·A general profile of discursive construction | 第35-38页 |
| ·Consistent identities of USA discursively constructed | 第38-42页 |
| ·Diversified identities of USA discursively constructed | 第42-45页 |
| ·Discursive positioning of four Middle East nations | 第45-47页 |
| ·Contextual factors in the socio-critical domain | 第47-51页 |
| ·Middle East and geopolitics as social context | 第47-49页 |
| ·Power relations as discursively constructed in the speeches | 第49-51页 |
| Chapter Five Conclusion | 第51-53页 |
| ·Major findings | 第51-52页 |
| ·Limitations and suggestions | 第52-53页 |
| References | 第53-55页 |
| Appendices | 第55-57页 |
| Appendix one | 第55-56页 |
| Appendix two | 第56-57页 |
