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    题目列表(包括答案和解析)

    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

     

    查看答案和解析>>

    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.
    【小题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
    【小题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
    【小题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
    【小题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
    【小题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

    查看答案和解析>>

                                     
    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.
    【小题1】A computer screen may injure your eyes if __________.

    A．you sit 60 centimeters awayB．you remember to look away
    C．your eyes are too close to it　　D．the window is on your left or your right
    【小题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
    【小题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 timeD．the window is behind you
    【小题4】It is good for your back and neck if you sit __________.
    A．in the right wayB．for many hours
    C．with the screen below your eyesD．with your back leaning forward
    【小题5】 What would be the best title for the passage?
    A．How to protect your eyesB．How to protect your hands and wrists
    C．How to use a computer safelyD．How to protect your back

    查看答案和解析>>

                                     

      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

     

    查看答案和解析>>

    　　Are you carrying too much on your back at school?I'm sure lots of children of your age will say“Yes”．Not only the students in China have this problem, but children in the United States also have heavy school bags．

    　　Doctors are starting to worry that younger and younger students are having back and neck problems, as a result of school bags being too heavy for them．

    　　“It's hard for me to go upstairs with my bag, because it is so heavy,”said Rick Hammond, an 11-year-old student in the US．

    　　Rick is among the students who have common school bags with two straps(带子) to carry them．But many other students choose rolling(带滚轮的)bags．

    　　But even with rolling bags, getting upstairs and buses is still a problem for children．Many of them have hurt their backs and necks because of the heavy school bags．

    　　But how much is too much?Doctors say students should carry no more than 10％ to 15％ of their own body weight．

    　　Scott Bantch, a back doctor, said children under grade 4 should stay with 10％．But it is also important that older children don't stay with over 15％, because their bodies are still growing．“Children are losing their balance and falling down with their school bags,”he said．

    　　Parents and teachers are starting to tell children to only take home library books they will be reading that night．Some teachers are using pieces of paper or thin workbooks for students to take home．

    　　One of the best answer is, as some children said, to have no homework at all!

    根据短文内容判断句子正(T)误(F)

    (1)

    The Chinese students' schoolbags are too heavy today．So do theirs in America．

    (　　)

    (2)

    Doctors are worrying about their patients．

    (　　)

    (3)

    One of the schoolbags is rolling．

    (　　)

    (4)

    Children feel it hard for them to go upstairs, because they are too young．

    (　　)

    (5)

    Some of the students think the best answer to this problem is that they should bring some books．

    (　　)

    查看答案和解析>>


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