第15题答案为：

one or two。细节题。由原文“Maybe after a week or two they will start calling applicants．”可知答案。
【听力原文】
Secretary: Can I help you?              
     Judy: Yes. I sent in my resume at the end of last week. I'm applying for the accounts assistant position.
Secretary: May I have your name please?
      Judy: My name is Judy Liao. That's spelled               L--I--A--O.
Secretary: Alright...And did you have-some specific questions about your application?
      Judy: Not really. I was in the neighborhood, and I just wanted to stop in to see if you received my resume.
Secretary: Oh, that's no problem. Just give me a moment, and I can check. Judy Liao.
               Let's see... Yes, here it is. Judy Liao.
We have received your resume.
Judy: Thank you.
Secretary: Is there anything else I can help you  with?
Judy: Yes, maybe. The ad in the newspaper said you wanted the resume, a cover letter, and two letters of recommendation.
I included all those things in the envelope. Is there anything else I should send?
Secretary: No, that is all we need. If we have those things included, that is sufficidnt.
  Judy: Do you know when they will start setting up interviews for the job?
Secretary I'm hot really sure about that: But I know we are still receiving resumes.
Maybe after a week or two they will start calling applicants.
Judy: I see. Well, thank you very much for helping  me.  You  have  been  very  helpful.
Secretary: If you have any further questions, you can call any time.
  Judy: Thank you.
Secretary: Thank you. Goodbye.