单项选择题
W：Oh，hi，Daniel.（19）Are you going to the in-service gaining today？
M：You bet.I missed the training session last month，so I have to be sure to make this one.Aren’t you excited about the program？
W：Not really.（19）（20）Before I became a nurse I drove an ambulance and had a lot of emergency medical training.Practicing basic first aid techniques is a kind of boring for me.
M：Well I can understand that.But you know，it’s amazing how quickly you get out of practice.（21）As nurses in a hospital，we have all the fancy equipment for medical emergencies-and plenty of doctors around，so we hardly ever get a chance to practice basic techniques.They’re really easy to forget.And you know that practice makes perfect.
W：I can see your point，and it never hurts to review what you’re already supposed to know.By the way，who’s teaching the class this time？
M：Dr.Huston.She’s the new emergency room physician.
W：Well，she certainly ought to know what she’s talking about.I’ve heard she’s a really good surgeon.
M：That’s right.I’ve been taking care of some of the patients she worked on，and they all think highly of her.
W：When are you going to head over to the classroom？
M：Immediately.I’m just on my way there.Do you want to walk over together？
W：That sounds good to me.Let’s go and prepare for the training.
A．At a dentist office.
B．In a school.
C．In an ambulance.
D．At a hospital.