询问信：

Dear Sir,

I am organizing a group of students to pay a visit to the historical exhibition in you town. This visit will be part of our school’s social survey project. I would be grateful if you could supply me with the following information.

First of all, what are the dates between which the exhibition will be held, and what are the daily opening hours? Secondly, what is the size of the exhibition, what is its theme and what objects are on display? Thirdly, are there any other activities being held in connection with the exhibition?

I would also like to inquire if there is any discount available on entrance tickets for students. If so, how much is the discount and what is the minimum number of students necessary for it?

I look forward to your reply.                   

                                              Yours sincerely,

                                                 Li Ming