题目

I will be traveling to Australia as a Student Ambassador with People to People. People to People arranges for American students to travel all around the world to learn about other cultures, and to help others understand American culture. The program was founded by former President Dwight D. Eisenhower to promote peace through understanding. I had to put in many hours of special work to get to this point. First, a teacher nominated (推荐) me, and then I attended an informational meeting about the program. The application process included an interview, and finally, I was accepted. That’s whe若tanα=4，，则tan（α+β）=A.-B.C.-D.