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 (肘部） 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（前臂）, wrists, hands and the upper（上部） 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.

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　

2. Hand and wrist injuries are caused when you _________.

　　A. get plenty of exercise　　       B. move in the same way again and again

　　C. rest your wrists on something　  D. keep your elbows as high as the keyboard

3.Your eyes and hands will be safe if __________.

　　A. you work near a window　　       B. you often take a rest from working

　　C. you use a keyboard for a long time　　D. the window is behind you

4.It is good for your back and neck if you sit __________.

　　A. in the right way                           B. for many hours

　　C. with the screen below your eyes       D. with your back leaning forward

5. What would be the best title for the passage?

　　A. How to protect your eyes            B. How to protect your hands and wrists

　　C. How to use a computer safely       D. How to protect your back

阅读短文，根据短文内容，从短文后的六个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。（共8分，每小题2分）
　　As you grow rapidly through your teenage years, you will experience a lot of changes. The changes may seem difficult. 　1　 　Don’t panic! You will deal successfully with them! You are a young adult now!
　　With more responsibility, you will find more freedom to make your own choices. This is a time to be well informed about making choices. In this way you can make healthy balanced decisions. 　2　 　You may already know your career path or you may have no idea at all what you want to do. Both situations are fine! Work hard and the right opportunity will present itself to you.
　　Young adulthood means greater freedom and more choices. 　3　 　But try not to shut your family out of your life. You should learn to think of others even though you are old enough to look after yourself.
　　It is also perfectly natural at this time for you to spend more time with your friends than your family. Choose your friends wisely. A true friend will stand by you no matter what happens.
　　This period is a part of the life cycle. There are some people who will be with you throughout life’s journey. There will be some people with whom you part and go separate ways. Leaving school can be hard. The reality is that you may not even see all of your classmates again.
　　You are a young adult. It is your life. No one can live it for you. 　4　 　So making the right choices will be important to you. Life is for living. Enjoy your life wisely.