听一段材料，回答下面几个小题。What are the man and the woman talking about?
A．Mr．Brown’s son．
B．Mrs．Down’s son.
C．Mike’s school．How long does Mike stay with his classmates a day?
A．About 8 hours．
B．About 6 hours．
C．At least 10 hours．How does Mike usually go to school?
A．By bus．
B．In his father’s car．
C．On foot．
Who are the two speakers?
A. A bus driver and a passenger.
B. A policeman and a driver.
C. A taxi driver and a passenger.
What is the probable relationship between the two speakers?
A. Wife and husband.
B. Passenger and driver.
C. Salesgirl and customer.
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.