When you think of all the ways your body can get hurt---falling off a bike, stepping on a

When you think of all the ways your body can get hurt---falling off a bike, stepping on a nail, being bitten by a crazed dog---the aches and pains that come from sitting at a computer may not seem like much.
But more doctors are getting worried about just that. If you sit at a PC the wrong way, the nerves and muscles in your back, neck and arms can get out of line.
Ergonomics is the study of how people work and how jobs and equipment can be designed so that people are safer and more comfortable in the things they do---whether that’s working on a factory assembly line or sitting in front of a computer.
The monitor
You should not have to tilt（倾斜） your neck up or down to lock at the screen. Your eyes should be level with the top of the screen.
How far away should you sit? Reach your arm out so your fingertips just touch the screen.
The keyboard
It should be directly in front of you. Don’t unfold the legs on the bottom of the keyboard so that it tilts up toward you---it should be as flat as possible, or even tilted away from you. You want your wrists “neutral,” which means straight, not bent. This puts less strain on your nerves and muscles.
Arms should be close to the body. Don’t look at your fingers as you type. Use a document holder to hold papers at the same level as the monitor. Keep the mouse on the same level as the keyboard and close by--- so you don’t have to reach for it.
The chair
Your feet shouldn’t dangle---the blood will pool in your feet. They should rest flat on the floor, or on phone books, if necessary. Your back needs support. Roll up a towel and stick it there.
The Body
If you think of your body as a collection of right angles when you sit at a computer, you should be just fine.
Your hips should be at a 90-degree angle to your back. That takes the pressure off the spine. And your knees should bend at a 90 degree angle so your feet are flat.
【小题1】The passage mainly talks about .A．avoiding pains caused by using PCB．the science of ergonomicsC．illness caused by a computerD．how to keep fit【小题2】The underlined word “ergonomics” most probably means in Chinese. A．管理学B．人机工程学C．机械工程学D．经济学【小题3】How high should a monitor be placed according to the passage?A．As high as your arms.B．A little higher than your eyes.C．A little lower than your eyes.D．At the same level as your eyes.【小题4】How shouldn’t a keyboard be placed?A．Tilting away from you.B．Tilting up toward you.C．Flat.D．Not mentioned.【小题5】How should you place your foot?A．Rest them on a phone book.B．Rest them on the floor.C．They should rest flat.D．They should dangle.A

(答案→)A 解析：本文讲述的是一些关于在使用电脑的时候任何保护好自己身体的建议。【小题1】A 主旨大意题。本文讲述的是一些关于在使用电脑的时候任何保护好自己身体的建议，故A项正确。【小题2】B 推理题。根据本句Ergonomics is the study of how people work and how jobs and equipment can be designed so that people are safer and more comfortable in the things they do---whether that’s working on a factory assembly line or sitting in front of a computer.说明该词是指学习在工作或者学习中如何让人们舒服安全。故应该是人体工程学的内容，B正确。【小题3】D 细节题。根据You should not have to tilt（倾斜） your neck up or down to lock at the screen. Your eyes should be level with the top of the screen.说明显示器要和你的眼睛同样水平的高度，故D正确。【小题4】B 细节题。根据Don’t unfold the legs on the bottom of the keyboard so that it tilts up toward you---it should be as flat as possible, or even tilted away from you.说明B项的内容符合句意。【小题5】C 细节题。根据Your feet shouldn’t dangle---the blood will pool in your feet. They should rest flat on the floor, or on phone books说明要让我们的脚在地上得到休息，故C项正确。

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