A、Stabbing. B、Quite intense. C、Labor. D、Dull. B对话中提到the pain is pretty intense，故B正确。labor阵痛；stabbing突发的疼痛；dull无趣味的。

W: Hi, Martin! So what’s your problem?
M: Well, recently I’ve been getting this pain here, just behind my eyes and in my forehead.
W: I see. Have you felt sick or dizzy at all, or vomited?
M: No, not at all, though the pain is pretty intense sometimes.
W: And how’s your health generally? Have you had any colds or flu recently?
M: I had a cold a couple of weeks ago, but that’s gone. It was only a sniffle really.
W: Good. Are you studying a lot? Are you getting enough sleep?
M: Yes, I’m studying quite a lot—I’ve got some exams coming up in December, but I’m making sure to sleep plenty.
W: What time do you go to bed?
M: Usually around 11. I’m up about 7.30 so I have time to go jogging for half an hour before going in to the university at 9.
W: Very healthy. And has this pain kept you awake or stopped you jogging?
M: Yes, it makes getting to sleep harder. It’s much worse at the end of the day. I hardly notice it in the morning.
Questions 16 -20 are based on the conversation you have just heard.
16. Why is Martin visiting the doctor?
17. How many hours does Martin usually sleep each night?
18. Which of these describes Martin’s problem?
19. How’s Martin’s pain like?
20. Which of the following statement is true?