cover letter是什么东西？？和business letter是一个东西嘛？

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不是一个东西。 cover letter 的英文解释是 a letter sent along with other documents to provide additional information。就是随你的信一起发出，但是作为首页，提供你个人的一些信息及这个信件的概括说明什么的。不知道你们老师要你们写什么类型的cover letter，一般来说，cover letter用在求职的简历、商业信函、或者其他文件。我这里举一个求职的简历 cover letter 的例子。

Your Street Address City, State Zip Code Telephone Number Email Address （上面是你的资料） Month, Day, Year Mr./Ms./Dr. FirstName LastName Title Name of Organization Street or P. O. Box Address City, State Zip Code （收信方的资料） Dear Mr./Ms./Dr. （对方的姓）： Opening paragraph: State why you are writing; how you learned of the organization or position, and basic information about yourself. （第一段说明你写这个信的目的、你怎样了解到这个机构以及个人简介） 2nd paragraph: Tell why you are interested in the employer or type of work the employer does (Simply stating that you are interested does not tell why, and can sound like a form letter). Demonstrate that you know enough about the employer or position to relate your background to the employer or position. Mention specific qualifications which make you a good fit for the employer's needs. This is an opportunity to explain in more detail relevant items in your resume. Refer to the fact that your resume is enclosed. Mention other enclosures if such are required to apply for a position. （你为什么对这个工作感兴趣、你的能力。

。。等等） 3rd paragraph: Indicate that you would like the opportunity to interview for a position or to talk with the employer to learn more about their opportunities or hiring plans. State what you will do to follow up, such as telephone the employer within two weeks. If you will be in the employer's location and could offer to schedule a visit, indicate when. State that you would be glad to provide the employer with any additional information needed. Thank the employer for her/his consideration. （说明你愿意/希望跟雇主进一步接触。

。。等等） Sincerely, (Your handwritten signature) Your name typed Enclosure(s) (refers to resume, etc.)