Question

Computers can injure (伤害) 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小题1: from the screen. ◆Remember to小题2:  the screen sometimes.
小题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小题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. ◆小题5:  every 30 minutes if you are sitting for a long time.

Answer 1

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

试题分析：这篇短文主要介绍电脑对人体的伤害。文章介绍了电脑对眼睛、手及手腕、背部的伤害以及具体防护办法。
小题1:根据短文Your eyes should be more than 50 centimeters from the screen的描述可知，眼睛应该距离电脑屏幕50厘米以上。故应填50 centimeters。
小题2:根据短文Don’t forget to look away from it sometimes的描述可知，眼睛不能长时间注视屏幕，要时不时的离开屏幕，从而让眼睛得到休息。故应填look away from。
小题3:联系上下文，文章文章介绍了电脑对眼睛、手及手腕、背部的伤害。故应填Hands and wrists。
小题4:根据短文Keep your elbows (肘) as high as the keyboard的描述可知，应该保持肘部和键盘一样高。故应填the keyboard。
小题5:根据短文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，每半小时应该起来活动手臂、腿和脖子。故应填get up。