单项选择题

Section A Directions: In this section, you will hear 10, short conversations. At the end of each conversation, a question will be asked about what was said. Both the conversation and the question will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer. Then mark the corresponding letter on the Answer Sheet with a single line through the center.

A.Customer and assistant.
B.Father and daughter.
C.Dentist and patient.
D.Teacher and student.