youquicklycloseyourmouth.Wealsoknowthatyawningiscontagious.Whenyouseesomeoneyawn,youyawn,too.Manypeoplesaytheyyawnbecausetheyareboredortired.Thatmightbetrue.Peopledooftenyawnbeforetheysleepandaftertheywakeup.However,weknowthatpeoplealsoyawnwhentheyareexcitedornervous.Olympicrunners,forexample,oftenyawnbefore a race...
根据“Scientists have different ideas about why we yawn, but no one knows them for sure.”可知科学家对于我们为什么打哈欠有不同的看法,但是没有人确切知道,可推断them指代前句中的“ideas about why we yawn”。故选A。 (2)题详解: 细节理解题。根据“When our brains are cooler, we can think ...
What is certain is that a yawn can creep up on us at any time even when we think we’re not tired – but, I hope, not when you’re reading this article! 词汇表 yawning 打哈欠bored 感到无聊的tired 疲倦的,累的set sb. off ...
It's a question that has puzzled scientists for a long time: why exactly do we yawn? In a recent breakthrough, scientists have discovered the part of the brain responsible forcontagiousyawning. It’s called the primarymotorcortex, and cont...
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 deeply. That causes a big yawn...
Have you ever wondered YAWN!why we yawn(打哈欠)? Do you always yawn when you see other people yawn? A new study from the University of Nottingham in the U. K. has done research on this. 1.It is a powerful and unstoppable reaction(反应).People automatically(自)want to yawn when the...
We also know that yawning is yawn contagious. 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 when they ...
1.根据When people are sleeping, they yawn to help stay awake. 可知后一句在解释原因。 2.根据When one person yawns, others often begin to yawn, too. 可知打哈欠会感染他人。 3.根据Watch how soon others begin to yawn.可知上文提到前提。 4.根据See if the fact可知空处与前文When one person ...
Theories on the reasons for yawning; Fetal yawning; Yawning and hiccuping among animals.O'Meara, Stephen JamesOdyssey
根据文中Yawning is one thing that newborn babies do often. 打哈欠是新生儿经常做的一件事。可知新生儿是知道如何打哈欠的,故填B。 【3】细节理解题。根据文中When people are sleepy, they yawn to help stay awake. This is because of fresh oxygen. 当人们困倦时,他们打哈欠帮助保持清醒。这是因为...