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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

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Number the sentences to make a conversation

(　　)Oh, that's too bad．I can go out, but I have to be home by ten o'clock．

(　　)Can you go to the movies tonight, Nancy?

(　　)You are lucky．I have so many rules…

(　　)No, I can't．I can't go out on school nights．

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完形填空。

　　Doctors and other scientists study the human mind and now they have proved that stress can have an influence on the health of your body．

　　Stress is 　　1　　 whenever there is a problem or change in your life．Of course, everybody has stress more or less and nobody’s life is 　　2　　．In fact, stress is necessary．Without 　　3　　, we would never learn anything or grow or change．We would 　　4　　 be bored to death．But too much stress can 　　5　　 you．

　　Today you have different kinds of stress．Problems like endless homework or troubles with your family are the kinds of things you can’t fight against 　　6　　 run away from．

　　　　7　　 can you do about stress? First, you can try to find ways to change things so you aren’t under so much stress．You can 　　8　　a plan to finish homework, go to a doctor or try to work things out with your family or friends．But sometimes you can’t 　　9　　 a stressful situation．Sometimes you don’t even want to．

　　The link between your body and brain 　　10　　 in two ways．Your body can help your mind deal with stress．If you are 　　11　　 stress, you need to take especially good care of your body．It’s important to get enough sleep and have nutritious meals．Another thing that you can do is daily 　　12　　．Anyone with a continuing physical problem should check with a doctor before starting any exercise programs．

(1)


[　　]
A．	produced
B．	caused
C．	suggested
D．	influenced

(2)


[　　]
A．	wonderful
B．	sad
C．	perfect
D．	helpful

(3)


[　　]
A．	change
B．	life
C．	problem
D．	stress

(4)


[　　]
A．	always
B．	probably
C．	maybe
D．	never

(5)


[　　]
A．	hurt
B．	beat
C．	injure
D．	influence

(6)


[　　]
A．	or
B．	and
C．	with
D．	so

(7)


[　　]
A．	When
B．	Why
C．	What
D．	How

(8)


[　　]
A．	start
B．	look up
C．	set up
D．	go on

(9)


[　　]
A．	make
B．	change
C．	have
D．	think

(10)


[　　]
A．	meets
B．	rests
C．	sleeps
D．	works

(11)


[　　]
A．	in
B．	under
C．	between
D．	on

(12)


[　　]
A．	exercise
B．	work
C．	life
D．	practice

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完成对话从方框内选择最佳选项，并把字母序号写在句子横线上。(方框中有两项与对话无关)

A：Hello, Mrs．Smith．I'd like to be a volunteer．　　1　　

B：Sure．What kind of volunteer work?

A：Well, I like working with kids．

B：　　2　　 We need someone to help teach kids basketball．

A：No, I don't really like basketball．Is there anything else?

B：Sure．There's a job cleaning up the parks．　　3　　

A：That's not good．I help take care of my grandmother on Sundays．

B：I see．　　4　　 Can you cook dinner?

A：Sorry, I can't．

B：Mmmm．We need someone to read to people at the hospital．　　5　　

A：That sounds good．When do I start?

B：How about today?

A：OK．

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阅读理解

　　Can you imagine spacemen's everyday life in space? They also need to eat, sleep, exercise and relax．They do the same things as us, but they do them differently．

　　On Earth, we put food on a plate．Gravity(重力)holds the food down and keeps it on a place．But there is almost no gravity in space, so food can float away, and spacemen must eat carefully．

　　Sleeping is very different in space．Some spacemen like to float(漂浮)in the air, but most like to be in a sleeping bag．They tie the bag to a wall so that they won't float away at night．

　　Exercise is very important in space．On Earth, your legs carry your body, but in space, spacemen float, so they do not use their legs often．This is very bad for their legs, so they must exercise for thirty minutes every day．

　　After a day's work, spacemen relax．They may listen to music, read, watch films, play games, or　talk to their friends and families on the radio．Sometimes they just enjoy floating in the air．

(1)

On Earth, people can put food on a plate because ________．
[　　]
A．	there is gravity
B．	the food is light
C．	the food is heavy
D．	the plate is heavy enough

(2)

In space, the food is ________．
[　　]
A．	on a plate
B．	in a glass
C．	floating in the air
D．	in a bag

(3)

Why do spacemen tie the sleeping bag to a wall?
[　　]
A．	Because in that way they won't float away．
B．	Because that makes them sleep well．
C．	Because they can't get to sleep if they don't do that．
D．	Because the sleeping bag is not safe enough．

(4)

After reading the fourth paragraph(段落), we can know it is about ________．
[　　]
A．	how spacemen eat in space
B．	how spacemen sleep in space
C．	what spacemen do for relaxing
D．	how spacemen exercise in space

(5)

What's the main idea of the passage?
[　　]
A．	It is about the importance of gravity．
B．	It is about spacemen' everyday life in space．
C．	It is about the difference between space and Earth．
D．	It is about how to avoid floating away while sleeping．

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