听一段材料，回答下面几个小题。When did the man begin to feel sick?
A.Yesterday afternoon.
B.Last night.
C.This morning.What might cause the man’s sickness?
A.Dirty food.
B.Lack of sleep.
C.Too much alcohol.Why does the woman think the matter should be looked into?
A.It has caused great losses.
B.It frightens people greatly.
C.It has happened twice.
What is the probable relationship between the two speakers?
A. Customer and waitress.
B. Hostess and guest.
C. Boss and clerk.
What's the probable relationship between the two speakers?
A. A student and his teacher.
B. A student and his classmate.
C. A librarian and a student.
What's the probable relationship between the two speakers?
A. Teacher and student.
B. Doctor and patient.
C. Husband and wife.
What is the relationship between Jim and Bob?
A. Classmates.
B. Close friends.
C. Twin brothers.
What's the probable relationship between the two speakers?
A. Strangers.
B. Classmates.
C. Workmates.