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