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 Dictionary

Upper Intermediate Stories

Why Do We Yawn?
You will hear a story about yawning.
Listen and decide if the statements below are true or false.

1. We may yawn to enable us to inhale more carbon dioxide.
2. We may yawn to enable us to inhale more oxygen.
3. Research recently found that we yawn more when there is too much carbon dioxide.
4. Yawning causes more tension.
5. Yawning is contagious.
6. The research couldn't explain why it is contagious.
 


    

 

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