A、He couldn’t get any sleep. B、He had awful pains in his belly. C、He had some diarrhea. D、He had a bad appetite. B对话的开头医生问病人怎么了，

W: Good morning, Mr. Hutchinson. I’m Dr. Hawkins. What brings you to the emergency room?
M: (16) I’ve got terrible pains in my belly. And I feel like(19) I’ m going to throw up all the time.
W: How long have you had the pain?
M: (17) It started last night, up here but this morning it’s here, and it really hurts.
W: How was it last night?
M: (17)The pain came and went, and I managed to get a little sleep, but now it’ s really killing me. It’s been here for the past four or five hours.
W: How has your appetite been?
M: Oh, gee, I haven’ t eaten a thing since yesterday. I just couldn’t stand to look at food.
W: Are your bowel movements regular?
M: (20) I usually have one every day, but this time I haven’t had one for two days.
W: (20) Have you had any diarrhea?
M: NO.
W: How about your nausea and vomiting?
M: (20) Last night I was vomiting about every two hours.
W: Point with your finger where it hurts the most.
M; Right here.
W: Does it help if you lie still?
M: Yes, it does.
W: Please take off your clothes and put this sheet over you. I’ll come back in a minute.
16．What brings the man to the emergency room?
l7．What is not one of the characteristics of the man’s pain?
18．According to the symptoms，what illness may the man have?
19．What does the man mean by“I am going to throw up”?
20．What is not mentioned in the dialogue?