Dear Mr. Wang,
I am a computer science major from Peking University, and I am writing in response to your advertisement for recruiting a software programmer intern posted on our university BBS yesterday. I hope I can take the job.
The main reason for my confidence in this position lies in both my extensive academic training in software programming, and my work experience in the relevant industry which has further polished my abilities. Moreover, I have much spare time this semester, which can ensure my time commitment for the internship. Please find more details in my enclosed resume.
Thank you for your time and patience, and I would greatly appreciate it if you could grant me an interview.