题目内容
（请给出正确答案）
What causes eye problem when using a computer？
A．Blinking eyes less．
B．Using fewer eye-drops．
C．Moving eyeballs fast．
D．Concentrating on work．
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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.
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M: Ok. Let's go and get some coffee. I can finish this later tonight.
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C．It improves a person's concentration.
D．It prevents a buildup of chemicals in the eyes.
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