英语作文，写一封介绍信，4级水平就OK，题目在下。

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解决方案1：

November 3, 2007

Dear Professor Lin, this is Li Hua, your former student from year of 2004. Do you still remember me? I was in your Physics class from 2002-2004, and I graduated in June, 2004. I hope you are all well in the school.
I'm writing to introduce my friend to you, Luo Jie. He is studying in the same university as me. He is now writing an essay about high school that he will need information to make the draft. Since you've been working in the secondary school for more than 20 years, will it be possible for him to interview you? And if possible that he can have access to our school libary? I know you will be busying at teaching at the moment. Your help will be much appreciated!
Thank you for your attention to this matter and hope to receive your reply soon.
Wish you all the best!

Sincerely,

Li Hua