2017-02-23 16:46 来源：小牛英语
Sometimes people feel sleepy. They can't stay interested in what they are doing. That is when they open their mouths wide. We call this a yawn. It makes a pretty silly face. Why do people do it?
Scientists do not know much about yawns. But they have some ideas. Our bodies get tired. Our minds get tired, too. A tired mind needs air. So we yawn. The quick yawn takes in air. And the air wakes up our mind. But not for long. Watch out! Here comes another yawn.
sleepy adj. 困乏的；欲睡的
yawn n. 呵欠
wide adj. 宽的；广阔的
scientist n. 科学家
mind n. 头脑；智力；精神
一、Read the passage and write "T" for true and "F" for false.
( ) 1. When people feel sleepy, they yawn.
( ) 2. Yawning makes people have a pretty silly face.
( ) 3. People don't know why they yawn.
( ) 4. We yawn when our minds get tired.
( ) 5. The quick yawn takes in air and lasts for a long time.
二、According to the passage, choose the best answer:A, B, C or D.
( ) 1. We yawn with our _______ .
A. nose B. mouth C. ears D. eyes
( ) 2. This story tells about what people do when they are _______ .
A. asleep B. eating C. tired D. drinking
( ) 3. In the first part of the story, what does the word "silly" mean?
A. Funny B. Pretty C. Dark D. Smile
( ) 4. People yawn in order to get more ______ .
A. food B. sleep C. air D. water
( ) 5. You can guess from the story that people do not stop yawning until they ______ .
A. rest B. read C. get tired D. asleep
三、Answer the questions about the story.
1. When do people yawn?
People yawn when they feel ______ .
2. What is a yawn?
When people open their ______ ______ , we call this a yawn.
3. Why do we yawn according to the passage?
A tired ______ needs air, so we yawn.
4. What's the usage of quick yawn?
A quick yawn takes in ______ which ______ ______ our mind.
5. Does the yawn take in air for a long time?
______ , it _______ .
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