根据上文Scientists have different theories about why we yawn, but nobody has been able to prove them.可知,科学家们对我们为什么打哈欠有不同的理论,但是没有人能够证明这些理论,故them指的是“理论”,故选C。 (2)题详解: 细节理解题。根据第二段中However, these days more and more scientists are ...
根据文中“When people are sleepy, theyyawn 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。这是因为新鲜的氧气。可知打哈欠可以让人们变得清醒,故填A。9.A细节理解题。根据文中“When one person yawns,others often begin to yawn, too. ”当一个人打哈欠...
Laura Donovan
We yawn even without thinking about it.Why do we yawn when we are tired? Some people believe that our bodies yawn when we need moreoxygen. When there are not enough oxygen in ourlungs, our mouth open wide. When we do this, ...
Quiz 04 Why do people yawn 00:0002:17打开APP 收听完整版 鳄鱼怎么清洁牙齿?骆驼的驼峰里有什么?我们能用章鱼喷的墨汁写字吗?能做彩色的梦吗?在妈妈子宫里时,小宝宝有指纹吗?人类与恐龙同期生活过吗?“清华少儿英语科学馆”提供全新图解式阅读体验,陪伴孩子用中英双语积探索我们生活的世界,帮助他们实现语言与...
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 ...
A yawn is often associated with a person being tired. 1 People yawn for many reasons including stress, boredom, emotion and overwork.Have you noticed that yawning seems to be contagious(会传染的)? If one person yawns,this appears to cause another person to yawn.Researchers have found that ...
【题目】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 fi...
E.Even reading the word YAWN can make people yawn.F.However, it doesn't mean that you need rest or relax??ation.G.Other people believe that yawning is a sign that danger is near.H.Another common theory is that a yawn helps regulate our body temperature....
When you see someone yawn, you yawn, too. Many people say that they yawn because they are bored or tired. This might be true. However, we know that people also yawn when they are excited or nervous. Olympic runners , for example, often yawn before a race. Why is that? Some ...