Part A You will hear 10 short dialogues. For each dialogue, there is one question and four possible answers. Choose the correct answer--A, B, C or D, and mark it in your test booklet. You will have 15 seconds to answer the question and you will hear each dialogue ONLY ONCE. What’s the probable relationship between them
A．Waiter and customer. B．Doorkeeper and visitor. C．Servant and hostess. D．Shop assistant and old customer.