完形填空。
     Computers can injure (傷害) you. Most other injuries happen suddenly. For example, if you fall over a bike
and break your arms, it happens very   1  . But computer injuries happen slowly. You probably know how to
ride a bike safely. Now learn to use a computer safely. Your eyes   2   light can injure your eyes,   3   never sit
too close to a computer screen. Your eyes should be   4   50 centimeters (厘米) on the screen.   5   remember
to look away from it. This gives your eyes a rest. When you use a computer, the window   6   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   7   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,   8   these three rules: 1)Rest your wrists on some-thing. 2) Keep
your elbows (肘) 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. 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 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   9   your arms, legs and neck. 
      10  your computer, but use it safely.
(     )1.A. much quickly
(     )2.A. Too many    
(     )3.A. so          
(     )4.A. at last   
(     )5.A. Sometime    
(     )6.A. can        
(     )7.A. both       
(     )8.A. follow      
(     )9.A. need       
(     )10.A. Enjoy       		B. fast     
B. Too much  
B. because  
B. at most  
B. Some time   
B. may     
B. never    
B. work      
B. exercise  
B. Use       		C. slowly     
C. Much too   
C. but       
C. at least   
C. Some times    
C. must       
C. all       
C. copy       
C. move       
C. Protect    		D. quickly   
D. Many more                 
D. when      
D. less than 
D. Sometimes 
D. should    
D. neither   
D. write    
D. shake     
D. Keep      
1-5 D B A C D   6-10 D A A B A
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