Some think we yawn because we feel bored. Others believe yawning has something to do with breathing(呼吸). When there is too much carbon dioxide(二氧化碳) in our bodies, our bodies will tell the brains(大脑) to breathe deeply. That causes a big yawn. In 2007, scientists said people ...
Why do people yawn(打呵欠) It is a way to get more oxygen(氧气). When people are sleepy, they yawn to help stay awake. This is because of fresh oxygen. Yawning is one thing that newborn babies do often.When one person yawns, others often begin to yawn, too. Once a film of someo...
Why do we yawn(打哈欠)? Well, scientists are not really sure. Some think we yawn because we feel bored. Others believe yawning has something to do with breathing(呼吸). When there is too much carbon dioxide(二氧化碳) in our bodies, our bodies will tell the brains(大脑) to breathe deepl...
Why do some people have perfect pitch? Why do we dream? Why do some people have synesthesia? Why do we yawn? why开头的疑问句句型 why 开头的疑问句句型 Why do birds migrate? Why do leaves change color in the fall? Why is the sky blue? Why do we need to drink water? Why do some ...
根据第三段第二句“The volunteers looked at videos of otherpeople yawning.”以及倒数第二句“Thevolunteers were videoed as they yawned ortried not to yawn."两句可知,参与研究的志愿者们既要看打哈欠的视频,又会被拍摄自己做出的反应。故D项正确。3.选A 段落大意题。最后一段提到,了解了打哈欠这种行为...
People do often yawn before they sleep and after they wake up. However, we know that people also yawn when they are excited or nervous. Olympic runners, for example, scientists found that a yawn can help a warm brain cool down. Some scientists believe that yawning makes you notice things ...
When you yawn, you breathe deeply. You also stretch (强化) the muscles (肌肉) in your face, mouth, and neck. Your eardrums stretch, too. 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...
Yawning (打哈欠)is someching we all da maybc besuse wer bored crryng o. tring untbior becarne we re tired. Sometines JUSt seieg other people yawn cean se you of But Rialosice finction rally cntagious (有感染力的),and why do we ao im the Rist piee? Many of ...
Why do some people have allergies? Why do we need to sleep? Why do some animals hibernate? Why do some people have phobias? Why do we get nervous before public speaking? Why do some people have perfect pitch? Why do we dream? Why do some people have synesthesia? Why do we yawn?
While fatigue, sleep deprivation or boredom easily bring on yawns, scientists are discovering there's more to yawning than most people think. Some research even suggests that brain and body temperature can prompt you to yawn. We don't know much about why we yawn or if it serves any useful...