三、The rivalry and confrontation between the United States and China are becoming increasingly heated. Some people believe that the current situation is quite similar to the pre-World War I period, and are therefore concerned about the possibility of the next great war. Please answer the following questions: (1) What were the causes of the First World War? Using your knowledge of modern diplomatic history, please cite at least three factors to explain them. (15 points) (2) What are the substantive issues that cause serious friction and confrontation between the U.S. and China? What are the potential flash points that may trigger a conflict between the two powers? Is there any similarity between the current situation and the situation before the First World War? Is it likely that the rivalry between the two powers results in another major war? Please try to use the ideas or theories of international relations to discuss the questions. (20 points)