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收起要求 Direction: Your department has decided to hold an academic conference on environment protection next month. Write a letter to invite Professor Smith of Harvard University, an expert of this field, to deliver a speech. And ask him give you a confirmation. You should write about 100 words on ANSWER SHEET 2. Do not sign your own name at the end of the letter. Use The Students’ Union instead. Do not write the address. (10 points)