◎ 题干
阅读短文,回答问题。
     What do you hear? Sounds all round you! You can hear the sound of traffic, the wind in the trees, a dog
barking, your own breathing and lots of other things.
    But what is sound? Sound happens when something vibrates (振动) or shakes. We can make something
vibrate by hitting it. Try this experiment (实验). Put your ruler on your desk so that part of it sticks out
(伸出) over the edge. Put your hand on the part of the ruler that is on the desk. Now pull the part that is
sticking out over the edge down, and then let it go.
     The part you let go will vibrate. It will move up and down very quickly, and give out sound. The part
of the ruler sticking out over the edge of the desk produced the sound. If you make that part longer, you
will hear a lower sound. When you shorten it, you will hear a higher sound. Why does this happen?
     When you shorten the ruler, it will vibrate more quickly. When something vibrates more quickly it
produces a higher sound. If you lengthen the ruler, it will vibrate more slowly. When something vibrates
more slowly, it produces a lower sound.
1. How does sound happen?
    ________________________________________________________
2. How can we make something vibrate?
    ________________________________________________________
3. Can we hear a higher sound or a lower sound if we make the part of the ruler sticking out over the edge
    of the desk longer?
   ________________________________________________________
4. What does the word"lengthen" mean in Chinese?
    ________________________________________________________
5. What's the best title of the passage?
   _________________________________________________________
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“阅读短文,回答问题。 What do you hear? Sounds all round you! You can hear the sound of traffic, the wind in the trees, a dog barking, your own breathing and lot…”主要考查了你对  【科教类阅读】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。