________give him a ticket to a ball game?
A.Why not you
B.Why don’t you
C. Why not to
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Computers can injure (傷害) 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 happen 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 more than 50 centimeters from the screen. Don’t forget 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.
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2) Keep your elbows (肘) as high as the keyboard.
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Your back
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Enjoy your computer, but use it safely.
Title: How to use a computer safely | ||
Different parts of the body | Causes of the injuries | Some ways of keeping you away from computer injuries |
Eyes | ◆Too much light can injure your eyes | ◆Don’t sit too close to a computer screen. ◆Your eyes should be over1. from the screen. ◆Remember to2. the screen sometimes. |
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Back
| ◆You sit for many hours before a computer. ◆ You sit in the wrong way. | ◆You should keep your back straight when you sit. ◆5. every 30 minutes if you are sitting for a long time. |
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