听力原文：M: Doctor Brook, I just don't know what's wrong with mc. I always feel tired and

rundown. My wife finally persuaded me to visit you to find out what the trouble is.

W: Looking at your case history I see that you had pneumonia four years ago and that you also had a minor operation last year. Did you have any long aftereffects？

M: Well, I don't remember so...

W: For instance, how long did you stay at home each time？

M: Just a couple of days. But about six months ago I was home for about two weeks with a cold or something.

W: Did you see a doctor at that time or did you just stay home？

M: No, I didn't see a doctor. The symptoms were 'about the same as this time. When I began 'to feel better, I returned to work.

W: And when did you start feeling so tired again？

M: It must have been about ten days ago. When I came home from work one night there just didn't seem to be any reason to go back the next day.

W: Well, it sounds as if your problem may be the kind of work you do. The tests I just made don't show anything really wrong. But I would like to make some further tests in the hospital.

M: That's fine with me.

W: All right, you can check in tonight and I'll make the tests tomorrow morning.

(23)

A．Because he has pneumonia.

B．Because his wife told him to.

C．Because he feels tired.

D．Because his wife feels tired.