A、Doctor and nurse. B、Professor and assistant. C、Manager and secretary. D、Professor and student. D

W: I don’t understand why this book for self-study doesn’t have answers to the questions.
M: But it does. You can find them at the back of the book.
Q: What can we learn about the self-study book?

M: Excuse me. I’m having trouble hearing in the back of the room. Did you say that your teaching assistant would correct the final exams?
W: No. I said that my teaching assistant would collect them. I’ll read them myself.
Q: What is the probable relationship between the two speakers?