写作：

　　Mr. Luis Alexander 应邀来你校讲学与座谈，同你代表学校在座谈会上用英语致欢迎词。欢迎词应包括以下内容：

　　1. 对来访客人表示欢迎。

　　2. 介绍Mr. Luis Alexander：英国著名语言学家，著作有大家熟知的《新概念英语》和《跟我学》等。

　　3. 客人来校目的：①讲学；②进一步了解中国中学生学习英语的情况。

　　4. 请Mr. Alexander 作指导，提建议，就英语学习作演讲。

　　5. 大家可以向客人请教英语学习方面的问题。

【参考范文】

Dear schoolmates,

　　First of all, let's give our warmest welcome to our honorable (可敬的，光荣的) guest - Mr. Louis Alexander. Mr. Alexander is a world famous English Linguist. He's written a lot of works, including New Concept English, Follow Me and so on. All these are well known to us all. Mr. Alexander is invited to our school to give us lectures, and today he is going to have a talk with us to get a further understanding of English study in middle schools in China. If you have any questions on English, you are free to ask him. Now let's invite Mr. Alexander to give us a talk on English Study.