听力原文：W: Open wide. Now show me where it hurts. M: Here on the bottom, especially when I bite something cold or hot. I couldn't enjoy ice-cream and hot soup any more. It's a real torture. Q: What is the most probable relationship between the two speakers? (18) A．Mother and son. B．Lawyer and client. C．Teacher and student. D．Dentist and patient.
A. M: B. Q: C.Mother D. B．Lawyer E. C．Teacher F. D．Dentist G.