Dear Sir or Madam,
I am a senior from the Department of Business Administration of Beijing University. I am writing the letter in purpose of applying for admission into your esteemed institution/your recently advertised position for a staff member.
I am sure that I am qualified for it. First, enclosed with this letter is my resume, which further details my previous academic qualifications and work experience. Second, not only do my qualifications and experience make me a perfect candidate for it, my cheerful personality is well suited to studying in your prestigious university/working as a staff member. Last, my hobbies include sports and music.
Words fail me when I try to express my heartfelt gratitude to the help you rendered me. Your prompt and favorable attention to my inquiry would be highly appreciated.