【正确答案】
C
【答案解析】[听力原文]
W: Hi, Rex. How"s your history paper going?
M: It"s coming along.
But I"ve been staring at this computer screen for hours and my eyes hurt.
W: Yeah, doing that can make your eyes feel really dry and tired. You should take a break.
M: I can"t. I have to get this paper written. It"s due tomorrow.
W: You know, I read about computers and eye problems recently. The article says that they are usually caused by not blinking your eyes enough.
M: Blinking? I thought I just needed new glasses.
W: When you blink, the movement of closing and opening your eyes, even though it happens really fast, helps moisten your eyes.
It"s the lack of moisture that causes the problem.
M: Oh, that makes sense. But what does it have to do with the computer?
W: People who use computers tend to stare at the monitor and blink less often than they normally would. That leads to dry and painful eyes.
M: Well, hope this news can help my eyes now. They really hurt.
W: The article I read about office workers found that the workers averaged 22 blinks a minute when relaxed, but just 7 a minute while looking at text on a computer screen.
M: Wow, that"s quite a difference.
W: They also kept their eyes open wider, which means that moisture vanished more quickly.
M: I wonder if using some kind of eye drops would make eyes feel better.
W: That might help.
But the best way is to take a break and rest your eyes.
M: OK
Let"s go get some coffee. I can finish this later tonight.
Why do the man"s eyes hurt?
[解析] 女士问男士他的历史作业做得怎样了，男士说在进展中，但是他已经盯着电脑屏幕好几个小时了，他眼睛疼痛。可见男士是由于长时间盯着电脑屏幕而引起眼睛疼痛，选C。
女士说睁眼和闭眼会使眼睛湿润舒服，可见A的理由不正确，实际男士也没有频繁眨眼；文中没有提到昨天睡眠不足排除B；男士是在电脑上做历史作业，而不是做关于电脑的作业，故D可排除。