听力原文:M: Excuse me, but I don't know which is the call number of this book and what a call number is for. W: The call number is the number in the top right corner of the card. It is used as a guide to find the book you want. Q: What is the man doing? (17) A.Finding a book in the library. B.Making a phone call. C.Seeing a doctor in a hospital. D.Solving an arithmetic problem.
A. W: B. Q: C.Finding D. B.Making E. C.Seeing F. D.Solving G.