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 at least 50 cm(厘米)from the screen, remember to look away from if sometimes．This gives your eyes a rest．

　　When you use a computer, the window should be on your left or your fight．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)at the same height 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 should sit with your back straight．The top pan of the screen should be in front of your eyes．If you are sitting for a long time, get up every 30 minutes and exercise your arms, legs and neck．

　　Enjoy your computer, but use it safely．

(1)

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

(2)

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

(3)

What would be the best title for the text?

[　　]

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

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