求一篇高三英语作文.急用!要求:你的老师来自一所和你校签署了教师交流协议的美国中学.不久前他回国教学.写一封邮件.内容:1.对他的感激之情.2.介绍他离开后你自己和你班里发生的事情.3.希望了解他的近况 100字以上开头是：Dear Sue:I'm Lihua,one of your students.

Since mid-April 2009, influenza A H1N1 influenza spread rapidly around the world, a serious threat to these people's lives. Requests for such flu-like symptoms, modes of transmission and ,