听一段材料，回答下面几个小题。
What’s the relationship between the two speakers?
A.Secretary and boss.
B.Teacher and student.
C.Doctor and patient.
Why was she late?
A.Her aunt called her to get up late.
B.She missed the bus.
C.She got a telephone call.
What can we know about the teacher?
A.He is strict with his students.
B.He is cold to his students.
C.He gets angry easily.