B
Why do we yawn?
(新素养 推理探究) 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 then push it out. Then you quickly close your mouth. We also know that yawning is 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 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(绷紧) 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 mouth 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 do not spend much time studying yawning. That is probably because yawning does not hurt. It is just something we do.
(
A. Able to spread quickly.
B. Able to breathe easily.
C. Able to change easily.
D. Able to sleep quickly.
(
A. Reasons for yawning.
B. Advantages of yawning.
C. Disadvantages of yawning.
D. Different ideas about yawning.
(
Why do we yawn?
(新素养 推理探究) 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 then push it out. Then you quickly close your mouth. We also know that yawning is 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 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(绷紧) 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 mouth 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 do not spend much time studying yawning. That is probably because yawning does not hurt. It is just something we do.
(
A
)4. What does the underlined word “contagious” in Paragraph 2 mean?A. Able to spread quickly.
B. Able to breathe easily.
C. Able to change easily.
D. Able to sleep quickly.
(
D
)5. What is the main idea of Paragraph 5?A. Reasons for yawning.
B. Advantages of yawning.
C. Disadvantages of yawning.
D. Different ideas about yawning.
(
B
)6. (新考法 篇章结构) What would be the best structure of the passage?答案：4. A 5. D
6. B 【解析】第一段引出话题，说明人们打哈欠可能有大约20种原因；第二至五段介绍了人们打哈欠的方式和原因，以及包括科学家在内的不同的人对于打哈欠的看法；最后一段总结全文。由此可知，B项最符合文章结构。
6. B 【解析】第一段引出话题，说明人们打哈欠可能有大约20种原因；第二至五段介绍了人们打哈欠的方式和原因，以及包括科学家在内的不同的人对于打哈欠的看法；最后一段总结全文。由此可知，B项最符合文章结构。
解析：
翻译:
B
我们为什么会打哈欠？
（新素养 推理探究）你会打哈欠吗？经过研究，科学家认为打哈欠可能有大约20个原因。他们并不确切知道打哈欠为什么会发生，但他们确实知道很多关于打哈欠的事实。
我们知道每个人打哈欠的方式都是一样的。首先你慢慢地张开嘴。你的嘴会保持张开大约五秒钟。你吸入大量空气，然后把它呼出去。然后你快速闭上嘴。我们还知道打哈欠是会传染的。当你看到有人打哈欠时，你也会打哈欠。
很多人说他们打哈欠是因为无聊或者疲倦。这可能是真的。人们确实经常在睡觉前和醒来后打哈欠。然而，我们知道人们在兴奋或紧张的时候也会打哈欠。例如，奥运会的跑步运动员在比赛前经常打哈欠。这是为什么呢？2007年，科学家发现打哈欠可以帮助发热的大脑降温。
一些科学家认为打哈欠能让你更快地注意到事物。当你打哈欠时，你会深呼吸。你还会绷紧脸部、嘴巴和颈部的肌肉。你的耳膜也会绷紧。也许这能帮助你更快地注意到事物。
在一些国家，人们认为打哈欠是不礼貌的。人们会用手捂住嘴来掩饰打哈欠。在其他国家，人们认为打哈欠是健康的。他们认为把嘴张得很大可以让好的东西进入体内。当他们呼气时，他们认为坏的东西会随着空气排出体外。
科学家不会花很多时间研究打哈欠。这可能是因为打哈欠不会造成伤害。它只是我们会做的一件事。
（A）4. 第二段中划线单词“contagious”是什么意思？
A. 能够快速传播。
B. 能够轻松呼吸。
C. 能够轻易改变。
D. 能够快速入睡。
（D）5. 第五段的主要意思是什么？
A. 打哈欠的原因。
B. 打哈欠的好处。
C. 打哈欠的坏处。
D. 关于打哈欠的不同看法。
（B）6. （新考法 篇章结构）这篇文章最好的结构是什么？
B
我们为什么会打哈欠？
（新素养 推理探究）你会打哈欠吗？经过研究，科学家认为打哈欠可能有大约20个原因。他们并不确切知道打哈欠为什么会发生，但他们确实知道很多关于打哈欠的事实。
我们知道每个人打哈欠的方式都是一样的。首先你慢慢地张开嘴。你的嘴会保持张开大约五秒钟。你吸入大量空气，然后把它呼出去。然后你快速闭上嘴。我们还知道打哈欠是会传染的。当你看到有人打哈欠时，你也会打哈欠。
很多人说他们打哈欠是因为无聊或者疲倦。这可能是真的。人们确实经常在睡觉前和醒来后打哈欠。然而，我们知道人们在兴奋或紧张的时候也会打哈欠。例如，奥运会的跑步运动员在比赛前经常打哈欠。这是为什么呢？2007年，科学家发现打哈欠可以帮助发热的大脑降温。
一些科学家认为打哈欠能让你更快地注意到事物。当你打哈欠时，你会深呼吸。你还会绷紧脸部、嘴巴和颈部的肌肉。你的耳膜也会绷紧。也许这能帮助你更快地注意到事物。
在一些国家，人们认为打哈欠是不礼貌的。人们会用手捂住嘴来掩饰打哈欠。在其他国家，人们认为打哈欠是健康的。他们认为把嘴张得很大可以让好的东西进入体内。当他们呼气时，他们认为坏的东西会随着空气排出体外。
科学家不会花很多时间研究打哈欠。这可能是因为打哈欠不会造成伤害。它只是我们会做的一件事。
（A）4. 第二段中划线单词“contagious”是什么意思？
A. 能够快速传播。
B. 能够轻松呼吸。
C. 能够轻易改变。
D. 能够快速入睡。
（D）5. 第五段的主要意思是什么？
A. 打哈欠的原因。
B. 打哈欠的好处。
C. 打哈欠的坏处。
D. 关于打哈欠的不同看法。
（B）6. （新考法 篇章结构）这篇文章最好的结构是什么？