题目

听下面一段较长对话，回答以下小题。【1】What did woman look like in high school?A. She had red hair. B. She had blond hair. C. She had curly hair.【2】Where are the speakers now?A. In Springfield. B. In Ovington C. In Brookfield.【3】What does the man think of his job?A. Dull but well-paid. B. Exciting but low-paid. C. Boring and low-paid.【4】What does the woman do for a living?A. She sells insurance.B. She works as a lawyer.C. She runs a seafood restaurant.从A={a1，a2，a3，a4}到B={b1，b2，b3，b4}的一一映射中，限定a1的象不能是b1，且b4的原象不能是a4的映射有（　　）个．A．12B．13C．14D．16