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

-- I hope you don't mind my opening the window.

-- ______ It's much too hot in here.

　　 A. Certainly　　　　　 B. Of course not

　　 C. All right　　　　　 D. Never mind

Many children use the Internet to get useful knowledge and information, and to relax in their free time. But some of them are not using in a good way. Here are some rules to make sure you are safe and have fun on the Internet.

Make rules for Internet use with your parents. For example, when you can go online, for how long and what activities you can go online.

Don’t give your password (密码) to anyone else, and never leak out the following information---your real name, home address, age, school, phone number or other personal information. 

Check with your parents before giving out a credit (信用) card number.

Never send a photo of yourself to someone in e-mail unless your parents say it’s OK.

Check with your parents before going into a chat room. Different chat rooms have different rules and attract different kinds of people. You and your parents must make sure it’s a right place for you.

Never agree to meet someone you met on the Internet without your parent’s permission (允许). Never meet anyone you met on line alone.

Always remember that people online may not be who they say they are. Treat everyone online as strangers.

If something you see or read online makes you uncomfortable, leave the site. Tell a parent or teacher right away.

Treat other people as you’d like to be treated. Never use bad language.

Remember—not everything you read on the Internet is true.

1. If you want a true friend on the Internet , you can ____________ .

A. tell the people what your name is .

B. meet the people on line alone.

C. write an e-mail about yourself .

D. get your parent’s permission.

2.It’s good for children to ________ on the Internet.

A. give password to others

B. get useful knowledge and information

C. give out a credit card number

D. go into a chat room as they’d like to

3. The underlined phrase “leak out” in the third paragraph may mean “________.”

A. give away　   B. leave out

C. give out      D. put away

4.If your parents don’t agree, never ________.

A. read anything on the Internet

B. relax in your free time

C. have a face-to face meeting with anyone you met online

D. treat other people as you’d like to be treated

5. This passage is mainly about “________”.

A. How to use Computers

B. Surfing on the Internet

C. Information on the Interne

D. Internet Safety Rules