Computers can injure 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 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 at least 50 centimeters from the screen. Remember 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 at the same height as the keyboard. 3) Stop something 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 all 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 exercise your arms, legs and necks.
Enjoy your computer, but use it safely.
【小题1】A computer screen may injure your eyes if __________.
A. you sit 60 centimeters away
B. you remember to look away
C your eyes are too close to it
D the window is on your left or your right
【小题2】Hand and wrist injuries are caused when you _________.

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▲ Buy and read the Basic Study Manual and use it to dramatically improve your ability to study.
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L. Ron Hubbard’s study technology for teenagers opens the door to their future success by giving them the ability to study and learn. Fully illustrated （插图）for easy comprehension.
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The basics of effective study for 8 to 12-year-olds, fully illustrated. Children who read and apply the materials in this book regain their liking for study and their ability to apply this knowledge in life. Get this book for a child you want to see win at his studies!
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【小题1】According to the advertisements, the four books are all intended for ______.

Most people have a cellphone(手机). When you are walking on a busy street, you will see many people speaking on their phones. Many people say they can’t imagine how they live without a cellphone.
Cellphones play an important role in our daily life, such as keeping in touch with others, calling home or the police if there is any emergency. Although cellphones can help us a lot, we must think of others when we use them. Unfortunately, some people do not consider others when using their cellphones. For example, some cellphone users speak too loudly and discuss personal matters in public places. Some people make phone calls in the cinema. Some people talk for a long time on the phone while they are driving on the busy road. Someone’s cellphone will ring during an important meeting. Many people complain about these bad manners. In their opinion, cellphone users shouldn’t disturb others when they make a call.
Then how to use a cellphone politely in public? The following rules will help you. When you’re in a meeting, watching a movie or having a lesson, you’d better turn off your cellphone. When you get a call and you’re with friends, try to make the call as short as you can. If you are waiting for an important call, then make sure that you tell others about this at the beginning of a meeting. It’s rude to scream(尖叫声) or shout on the phone. Make sure you will be heard only by the caller but not by the others around you. Besides, if possible, find a quiet place where you can talk in private.
【小题1】You can see many people using ________ in the street.
A. radio                           B. cellphones                         C. MP4
【小题2】What’s the Chinese meaning for the underlined word “emergency”?
A. 紧急情况                  B. 娱乐活动                          C. 公益活动
【小题3】People must consider ________ when they use cellphones in public.
A. themselves                    B. other persons                      C. their family
【小题4】It is good manners for cellphone users to ________.
A. make phone calls in the cinema
B. talk about personal matters loudly in public
C. turn off the phone during an important meeting
【小题5】The best title for this passage is ________.
A. Cellphone Manners       B. Cellphones Are Very Useful    C. Having a Meeting