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    Computers can injure you. Most other injuries happen suddenly. For example, if you fall off a bike and break your arms, it happens very quickly. But computer injuries slowly.
    You probably know how to ride a bike safely. Now learn to use a computer safely.
    Your eyes
    Too much light can injure your eyes, so never sit too close to a computer screen. Your eyes should be at least 50 centimeters from the screen. Remember to look away from it sometimes. This gives your eyes a rest.
    When you use a computer, the window should be on your left or your right. If it is behind you, the light will reflect on (反射) the screen. If the window is in front of you, the sun and the screen will both shine into your eyes.
    Your hands and wrists (手腕)
    Hand and wrist injuries can happen because the hands and wrists are moved in the same way hundreds of times. If you use a keyboard for a long time, follow these three rules: 1) Rest your wrists on something. 2) Keep your elbows at the same height as the keyboard. 3) Stop something and exercise your hands, wrists and fingers in a different way.
    Your back
    Some people sit for many hours in front of a computer. If you sit in the wrong way, you can injure your back or your neck. So you should sit with your back straight. The top part of the screen should all be in front of your eyes. Your forearms, wrists, hands and the upper part of your legs should all be parallel (平行) to the floor. If you are sitting for a long time, get up every 30 minutes and exercise your arms, legs and necks.
    Enjoy your computer, but use it safely.
    小题1:A computer screen may injure your eyes if __________.
    A. you sit 60 centimeters away
    B. you remember to look away
    C your eyes are too close to it
    D the window is on your left or your right
    小题2:Hand and wrist injuries are caused when you _________.
    A．get plenty of exercise
    B．move in the same way again and again
    C．rest your wrists on something
    D．keep your elbows as high as the keyboard
    小题3:Your eyes and hands will be safe if __________.
    A．you work near a window
    B．you often take a rest from working
    C．you use a keyboard for a long time
    D．the window is behind you
    小题4:It is good for your back and neck if you sit __________.
    A．in the right way
    B．for many hours
    C．with the screen below your eyes
    D．with your back leaning forward
    小题5:What would be the best title for the passage?
    A．How to protect your eyes.
    B．How to protect your hands and wrists.
    C．How to use a computer safely.
    D．How to protect your back.

    小题1:C
    小题2:B
    小题3:B
    小题4:A
    小题5:C

    小题1:细节题：从文章里的：so never sit too close to a computer screen. 说明离电脑屏幕太近会伤害眼睛。选C。
    小题2:细节题：根据第五段的：Hand and wrist injuries can happen because the hands and wrists are moved in the same way hundreds of times. 说明用上百次用同样的方式使用手和手腕会对它们造成伤害。选B。
    小题3:推理题;从倒数第二段的：If you are sitting for a long time, get up every 30 minutes and exercise your arms, legs and necks.推出如果我们工作一段时间后休息下就不会对眼睛和手造成伤害了。选B。
    小题4:文章倒数第二段的：If you sit in the wrong way, you can injure your back or your neck.如果你的坐姿不正确，就会对后背和脖子造成伤害，反之，如果选择正确的坐姿就不会有伤害，选 A。
    小题5:主旨题：文章最后一句话点题：Enjoy your computer, but use it safely.故选C。
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