参考答案：

范文

Dear Kate,

I am writing in the hope that you can lend me a book.

Recently I’ve been busy preparing my graduate thesis, and therefore have been reading and researching numerous books and references. One of the books that my advisor believes to be particularly relevant to my thesis is called The Composition of American Higher Education Investment. Unfortunately I have been unable to find it at the library or in any bookstores. Do you happen to have this book If so, may I borrow it I promise to take good care of it and will return it to you within two weeks.

I am looking forward to a favorable reply at your earliest convenience.

Sincerely yours,

Li Ming

解析：

[审题立意]

本题要求写一封请求信。在信的开头简要告知身份，表明写信原因或清求；在正文部分，详细阐明询问、请求的具体内容、希望获得的信息；结尾部分应当以套用经典句型来结束，表达谢意，希望得到对方回复、帮助或合作。在写作过程中，措辞一定要有礼貌，请求的内容要具体详尽。