A、It helps to keep the eyes moist. B、It helps the eyes absorb eye-drops. C、It improves a person’s concentration. D、It prevents a

W: Hi, Tom. How is your chemistry 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 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: No. 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: 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 irritated eyes.
M: Well, that’s certainly how mine feel now. They really hurt.
W: The article I read about the office workers found that the workers averaged twenty-two blinks a minute when relaxed, but just seven a minute while looking at the text on a computer screen.
M: Wow. That’s quite a difference.
W: They also kept their eyes open wider which means the moisture evaporate more quickly.
M: I wonder if using some kind of eye-drops will make them feel better.
W: That might help. But the best prescription is to just take a break and rest your eyes.
M: OK. I think I really need a rest. I can finish this later tonight.
W: Let’s go get some coffee for a break.
M: Good idea! Since you give me such useful information, it’s my treat.
W: You are so nice.
M: Oh, it’s my pleasure to have a drink with such a lovely girl!