Everybody yawns（打哈欠）- from unborn babies to great-grandparents.But why，exactly，do we yawn？（1）CC.
One theory（理論）is that when we are bored or tired，we just don't breathe as deeply as we usually do. （2）GG.Therefore，yawning helps us bring more oxygen into the blood and move more carbon dioxide out of the blood.
Yawning，then，would be an action that we can't really control to help us control our oxygen and carbon dioxide levels.Sounds good，but other studies have shown that breathing more oxygen does not make us yawn less.（3）FF.Hmmm.Now what？
（4）DD.Stretching （拉伸） and yawning may be a way to relax muscles and joints，increase heart rate，and feel more awake.
Other people believe that yawning is a protective way to redistribute（重新分配） the oil-like substance called surfactant that helps keep lungs from drying up.So，if we didn't yawn，according to this theory，taking a deep breath would become harder and harder - and that would not be good!
But there is one idea about yawning that everyone knows to be true：（5）AA.If you yawn in class，you'll probably notice a few other people will start yawning，too.Even thinking about yawning can get you yawning.How many times have you yawned while reading this article？We hope not many!
A.It seems to spread
B.Yawning seems to be common
C.No one knows for sure，but there are many theories
D.Another theory is that yawning stretches the lung and lung tissue
E.This theory indicates yawning，like a deep breath，helps us feel fresh
F.Likewise，breathing more carbon dioxide does not increase yawning
G.As this theory goes，our bodies take in less oxygen because our breathing has slowed
【考點(diǎn)】人與自我．
【答案】C；G；F；D；A
【解答】
【點(diǎn)評(píng)】
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發(fā)布：2024/4/20 14:35:0組卷：3引用：2難度：0.5
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3．Dear Laura，
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Yours，
Betty發(fā)布：2025/1/30 8:0:1組卷：12引用：2難度：0.5