你叫李平，是英语系学生会主席。写一封信给王教授，请他做一个有关中国历史的报告。注意信中要包括目的、时间、日期和地点。
writing
may 19，2002
dear professor wang：
on behalf of the student union of the english department， i am writing to invite you to give a lecture on chinese history.
we have planned to have such a lecture at 2：30 p. m. in lecture hall 419， on may 25.
looking forward to your lecture. inform us in advance if you can not come.
sincerely yours，
li ping