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        1. If you don't use a computer in a right way, it can injure your eyes, your hands, wrists and your back. Is it true? 64. If you work too long before a computer, what should you do for your hands and wrists? 查看更多

           

          題目列表(包括答案和解析)

          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 more than 50 centimeters from the screen. Don’t forget 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)as high 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 shouldn’t bend your back when you sit. The top part of the screen should be in front of your eyes. Your forearms, wrists, hands and the upper part of your legs should all be parallel(平行)to the floor. If you are sitting for a long time, get up every half an hour and exercise your arms, legs and neck.
          Enjoy your computer, but use it safely.
                           Title:  How to use a computer safely
          Different
          小題1: of your body
          Causes of the injuries
          Some 小題2: of keeping you away from computer injuries
           
          Your eyes
          ◆Too much light can injure your eyes
          ◆Don’t sit too close to a computer screen.
          ◆Your eyes should be  小題3:         50 centimeters from the screen.
           小題4: to look away from the screen sometimes.
           
          Your    小題5:    and wrists
          ◆You  小題6:  them in the same way hundreds of times.
          ◆You use a keyboard for a long time.
          ◆小題7: your wrists on something.
          ◆Keep your elbows at the same       小題8: as the keyboard.
          ◆Exercise your hands, wrists and fingers in different ways.
           
          Your back
          ◆You sit for many hours   小題9:  a computer.
          ◆ You sit in the wrong way.
          ◆You should keep your back             小題10:when you sit.
          ◆Get up every half an hour if you are sitting for a long time.

          查看答案和解析>>

          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 more than 50 centimeters from the screen. Don’t forget 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) as high 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 shouldn’t bend your back when you sit. The top part of the screen should be in front of your eyes. Your forearms, wrists, hands and the upper part of your legs should all be parallel (平行) to the floor. If you are sitting for a long time, get up every half an hour and exercise your arms, legs and neck.
          Enjoy your computer, but use it safely.
          Title: How to use a computer safely
          Different parts
          of the body
          Causes of the injuries
          Some ways of keeping you away from computer injuries
          Eyes
          ◆Too much light can injure your eyes
          ◆Don’t sit too close to a computer screen.
          ◆Your eyes should be over小題1:
          from the screen.
          ◆Remember to小題2:  the screen sometimes.
           
          小題3:
          ◆You move them in the same way hundreds of times.
          ◆You use a keyboard for a long time.
          ◆Rest your wrists on something.
          ◆Keep your elbows at the same
          height as小題4:  .
          ◆Exercise your hands, wrists and fingers in different ways.
           
          Back
          ◆You sit for many hours
          before a computer.
          ◆ You sit in the wrong way.
          ◆You should keep your back straight
          when you sit.
          ◆小題5:  every 30 minutes if you are sitting for a long time.

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