All sounds make waves.
When you hear your friend's voice，these sound waves go into your （1）e arsarsand you can identify（識別） your friend's voice.
（2）U suallysually，we cannot see sound waves but we can if we use some simple （3）m aterialsaterials.Put a piece of tissue（紙巾） close to your （4）l ipsips and speak.Then you can see the tissue moving when you speak.If you speak loudly，the tissue moves more，and if you speak softly，the tissue moves less.This happens because the sound waves have vibration（振 動）．
In （5）s ciencecience，there are names for different sound waves.When the sound vibration is （6）s lowlow，we call this a low-pitch （音調(diào)） sound.But when the sound vibration is fast，we call this a high-pitch sound.Pitch （7）d escribesescribeshow high or low a sound is.When the sound has less energy，we say it has a soft volume（音量）.But when the sound has more energy，we say it has a loud jye.ai.Volume is a measure of how loud or soft a sound is.
【考點】說明文．
【答案】ars；sually；aterials；ips；cience；low；escribes
【解答】
【點評】
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發(fā)布：2024/4/20 14:35:0組卷：1引用：1難度：0.4
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What's the book about？
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My favourite character：My favourite character is Charlie because he is very kind.I don't like the other children because they are horrible! Title：Charlie and the Chocolate Factory Author：Roald Dahl 
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This book is great!l love the incredible chocolates and sweets in the factory.Words to describe the book：
Interesting funny sad amazing magical excitingStar rating：
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★★★★★
5 stars = Fantastic!
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3 stars = OK
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