题目

听下面一段较长对话，回答以下小题。【1】What might the woman’s job be?A.She’s a diver.B.She’s a lifeguard.C.She’s a swimming instructor.【2】Who called the ambulance?A.The woman.B.One of the students.C.The man’s colleague.【3】When did the ambulance arrive?A.Immediately.B.Ten minutes later.C.Twenty minutes later.【4】How did the girl react when she awoke?A.She didn’t know what happened.B.She went back in the pool.C.She cried.下列物质分子的电子式正确的是（　　） A、CH3Cl   B、羟基    C、CO2    D、C2H4