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Yawning (Grade 2)

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Yawning

Once you start yawning, it's hard to stop.

People yawn for many reasons. They yawn when they wake up. They yawn when they go to sleep. They yawn when they are bored. They yawn when their ears are plugged up. They yawn when they see other yawns.

Humans aren't the only creatures that yawn. Dogs yawn. Cats yawn. Even birds yawn. Fish yawn too. Humans can even yawn when they're still in the womb.

What is a yawn? It's a movement of the muscles in your chest, mouth, and throat. Yawning helps wet tiny air sacs in your lungs.

People can't yawn on command. When they feel a yawn coming on, it's really hard to stop it. Scientists aren't sure why people yawn. Hippocrates was an ancient scientist. He thought yawning was a way to remove bad air from the lungs. In the 17th century other scientists studied yawning. They thought yawning increased your heart rate. They also thought it helped the level of oxygen in the blood. Today, scientists think yawning has to do with changing states. You yawn when you go from awake to asleep. You yawn when you go from asleep to awake. You also may yawn to go from alert to bored.

One thing is for certain - yawning is contagious. When you see someone yawn, your brain tells you to yawn too. It's a way to help you feel what others are feeling.
1. 
It's easy to stop yawning once you start.
  1. True
  2. False
2. 
Which is not a reason people yawn?
  1. Boredom
  2. Tiredness
  3. Hunger
  4. Others yawn
3. 
Scientists know why people yawn.
  1. True
  2. False
4. 
Yawning is involuntary, which means you can't make it happen on your own.
Which line from the passage DOES NOT show that?
  1. Humans aren't the only creatures that yawn
  2. People can't yawn on command
  3. Today, scientists think yawning has to do with changing states
  4. Yawning is contagious
5. 
How does yawning help plugged up ears?
  1. It plugs them more.
  2. It makes them pop.
  3. It helps them hear better.
  4. It causes them to lose hearing.

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