Do you yawn？There are about 20 reasons that scientists think are possible for yawning after research.They do not know exactly why yawning happens，but they do know many facts about yawning.
We know that everyone yawns in the same way.First you open your mouth slowly.Your mouth stays open for about five seconds.You take in a lot of air and yawn then push it out.Then you quickly close your mouth.We also know that yawning is______.When you see someone yawn，you yawn，too.
Many people say they yawn because they are bored or tired.That might be true.People do often yawn before they sleep and after they wake up.However，we know that people also yawn where they are excited or nervous.Olympic runners，for example，often yawn before a race.Why is that？In 2007，scientists found that a yawn can help a warm brain cool down.
Some scientists believe that yawning makes you notice things more quickly.When you yawn you breathe deeply.You also stretch（拉伸） the muscles（肌肉） in your face，mouth and neck.Maybe this helps you to be quicker to notice things.
In some countries，people think yawning is not nice.People put their hands over their mouths to cover a yawn.In other countries，people think yawning is healthy.They think that opening the mouth very big can let good things in.When they breathe out，they think that bad things go out of the body with the air.
Scientists won't spend much time studying yawning.That is probably because yawning does not hurt.It is just something we do.
（1）Which of the following is the best to fill in______ in Paragraph 2？ AA
A．a(chǎn)ble to spread（傳播） easily
B．a(chǎn)ble to change quickly
C．a(chǎn)ble to breathe quickly
（2）In some scientists' opinion，how does yawning make people notice things more quickly？ CC
A．By cheering people up.
B．By cooling down people's warm brains.
C．By stretching the muscles in faces，mouths and necks.
（3）What is Paragraph 5 mainly about？ CC
A．Advantages of yawning.
B．Disadvantages of yawning.
C．Different ideas about yawning.
（4）What can we learn from the passage？ BB
A．Yawning is bad for people's health.
B．All the people yawn in the same way.
C．Scientist will do further research on yawning.
（5）Why does the writer write the passage？ CC
A．To show the research on yawning.
B．To explain why yawning happens.
C．To introduce some facts about yawning.
【答案】A；C；C；B；C
【解答】
【點評】
聲明：本試題解析著作權(quán)屬菁優(yōu)網(wǎng)所有，未經(jīng)書面同意，不得復(fù)制發(fā)布。
發(fā)布：2024/8/5 8:0:8組卷：2引用：1難度：0.5
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