【单选题】Which of the following is an element of a CPA firm's quality control policies and procedures applicable to the firms accounting and auditing practice?
【单选题】听力原文:M: Mary, would you go to the Children's Center with us this Sunday afternoon? W: Well, I'd like to, but Mum asked me to see her nephew Tom at No. 1 People's Hospital. M: It doesn't matter. What's...