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.
If you use a keyboard for a long time, follow these three rules:
1) Rest your wrists on something.
2) Keep your elbows (肘) as high 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 shouldn’t bend your back when you sit. 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 half an hour and exercise your arms, legs and neck.
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 over小題1:
from the screen.
◆Remember to小題2:  the screen sometimes.
 
小題3:
◆You move them in the same way hundreds of times.
◆You use a keyboard for a long time.
◆Rest your wrists on something.
◆Keep your elbows at the same
height as小題4:  .
◆Exercise your hands, wrists and fingers in different ways.
 
Back
◆You sit for many hours
before a computer．
◆ You sit in the wrong way.
◆You should keep your back straight
when you sit.
◆小題5:  every 30 minutes if you are sitting for a long time.

小題1:50 centimeters
小題2:look away from
小題3:Hands and wrists
小題4:the keyboard
小題5:get up

試題分析：這篇短文主要介紹電腦對人體的傷害。文章介紹了電腦對眼睛、手及手腕、背部的傷害以及具體防護辦法。
小題1:根據(jù)短文Your eyes should be more than 50 centimeters from the screen的描述可知，眼睛應該距離電腦屏幕50厘米以上。故應填50 centimeters。
小題2:根據(jù)短文Don’t forget to look away from it sometimes的描述可知，眼睛不能長時間注視屏幕，要時不時的離開屏幕，從而讓眼睛得到休息。故應填look away from。
小題3:聯(lián)系上下文，文章文章介紹了電腦對眼睛、手及手腕、背部的傷害。故應填Hands and wrists。
小題4:根據(jù)短文Keep your elbows (肘) as high as the keyboard的描述可知，應該保持肘部和鍵盤一樣高。故應填the keyboard。
小題5:根據(jù)短文If you are sitting for a long time, get up every half an hour and exercise your arms, legs and neck.的描述可知，每半小時應該起來活動手臂、腿和脖子。故應填get up。
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