【答案解析】[参考范文]
Dear Sir/Madam,
I am an MBA candidate in this university who regularly come to the library to spend my spare time. Generally speaking, the services you offer here is quite good; however, I would like to extend my greatest appreciation if you are so kind as to take my suggestions into consideration.
First of all, will yon please prolong the time for reading? In the daytime, most of the students are having class, so they can"t come to the library. Moreover, some of the books on shelves are out of date. Updated materials are necessary for our academic research.
Thank you for your time and consideration and I am looking forward to hearing from you.

Sincerely yours,
Li Ming

[解析] 确定题型：建议信的考查(同时也考查感谢的表达方式)
确定主题：写给大学图书馆，第一感谢对方的房屋，同时提出建议以便改进。