情景：你刚上大学，想给高中班主任写一封信。
任务：请你用英语给高中班主任写一封50左右的信。告诉他：
1 你对大学生活的感觉如何；
2 大学与高中有什么区别；
3 简单谈谈自己的专业，课程情况。
请用下面格式：
Mr. Zhang ,
……
Chen Feng
范文：
Mr. Zhang ,
Everything here is new to me . I think college life is very interesting . But we are busier at college than at middle school . And my classmates come from different parts of our country . The teachers use different ways of teaching too . I study physics . We have many course to attend . And we have to work hard to pass all the them .