【正确答案】 B

【答案解析】[解析] 1-5 M1: The computerized workplace can be hazardous to your health if you don't take preventative measures. Today we'll go over what some of these hazards are, and more importantly, what can be done about them. One major complaint--maybe the biggest complaint--of people who spend time at the computer is eyestrain. To help ease the strain on the eyes, the computer screen should be about two feet from your eyes. The entire screen should be in focus. The brightness and contrast should be adjusted for best readability. A good way to relieve eyestrain is to look away from the screen frequently. Focus your eyes on objects that are far away, like something outside--the building across the street or the tree in the parking lot. W: But what if your office doesn't have a window? I mean, I've worked in lots of places where there's no window. M1: Then in that case, you need to get up and walk around. You should never sit for more than 30 minutes at a time anyway. This is important for the rest of your body as well, namely your back. Neck and back pain are a big problem for computer people. Always make sure your screen, keyboard, and chair are at the right height for you. M2: I think it's important to have a comfortable chair, one that sort of shifts your weight a little bit forward. I put a cushion on my chair, and that really helps my lower back. M1: That's not a bad idea. The right chair is a must, the right posture as well. Remember what your mother told you--sit up straight, with your feet on the floor. Another thing I wanted to talk about is air pollution in the workplace--sorry, did you have a question, Martha? W: I've heard that copy machines are bad for you. Is there anything to this? M1: Photocopy machines aren't a health hazard for people who use them only occasionally. But for people who use them a lot, there can be bad effects. For example, people who handle the toners can get skin rashes. If you handle the toner, you should pour it in slowly, to avoid spreading the dust, and always wash your hands afterward. Another problem--if the machines are in an area that's not well ventilated--is ozone. W: Ozone! No kidding! M1: It's true. Almost all photocopiers give off some ozone. However, the amount is usually less than what's considered hazardous. Most machines have an ozone filter, but this can still leak if the machine's not properly maintained. If you can smell a sort of electrical odor coming from the machine, it's a sign that it's giving off too much ozone. 1. What is the discussion mainly about? The speakers mainly discuss health dangers in the workplace. The instructor says: The computerized workplace can be hazardous to your health...; Today we'll go over what some of these hazards are