【题目】Computers can injure you. Most other injuries happen suddenly. For example, if you

___ a bike and break your arms, it happens very ______ . But computer injuries happen slowly. You ______ know how to ride a bike safely. Now learn to use a computer safely.

Your eyes _____ light can injure your eyes, _____ never sit too close to a computer screen. Your eyes should be _______ 50 centimeters ______ the screen.______ remember to look away from it. This gives your eyes a rest. When you use a computer, the window ______ be on your left or your right. If it is behind you, the light will reflect (反射) on the screen. Ifthe window is in front of you, the sun and the screen will_______ 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 _______ times. Ifyou use a keyboard for a long time,_____these three rules: 1) Rest your wrists on something. 2) Keep your elbows () at the same height as the keyboard. 3) Stop sometimes and exercise your hands, wrists and fingers in a different way.

Your back--Some people sit for many hours in front of a computer. Ifyou 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 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. Ifyou are sitting for a long time, get up ____ 30 minutes and ______ your arms, legs and neck._______ your computer, but use it safely.

1A. fall over B. fall on C. fall off D. fall onto

2A. much quickly B. regularly C. slowly D. quickly

3A. able B. maybe C. probably D. can

4A. Too many B. Too much C. Much too D. Many more

5A. so B. because C. but D. when

6A. at last B. at most C. at least D. less than

7A. to B. from C. on D. away

8A. Sometime B. Some time C. Some times D. Sometimes

9A. can B. may C. might D. should

10A. both B. never C. all D. neither

11A. hundred of B. hundreds C. hundreds of D. two hundreds

12A. follow B. work C. copy D. write

13A. one B. every C. every of D. once

14A. need B. exercise C. control D. shake

15A. Enjoy B. Use C. Protect D. Keep

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