[解析]
Dear Sir or Madam,
My name is Li Hua.I'm writing this letter to apply for the opportunity to go to America.(个人的主要情况)
As a senior school student who is really interested in learning English,I believe that this journey will make a great difference to me.(英语水平)
I have been learning English since I was a child, which contributes to my excellent English capacity nowadays. Not only can I read and write well, but also I am capable of expressing myself in English fluently.【高分句型一】 Therefore,I'm sure that I can communicate with the students in America well. What's more,I'm convinced that honesty is the best policy and as a result, most of my classmates love to make friends with me. In my spare time,I read a lot, especially classical English novels. Besides,I'm fond of sports and do exercise on a regular basis to stay healthy.(性格特点和兴趣爱好)
I hope the journey abroad can help improve my English as well as broaden my horizons, from which I can learn more about the differences and similarities between China and America.【高分句型二】(希望通过交流实现的目标)
I'm looking forward to your reply.(盼望)
Yours sincerely,
Li Hua