Can you remember a morning when you’ve woken up to the ring
来源:学生作业帮 编辑:搜狗做题网作业帮 分类:英语作业 时间:2024/06/26 01:10:53
Can you remember a morning when you’ve woken up to the ring of your alarm clock and wished you could stay in bed? You haven’t slept well, your hair is a mess. Worse, you can’t stop yawning. Yawning is universal to humans and many animals. Cats, dogs and fish yawn just like humans do! Yawning is an involuntary(无意识的,不自觉的) action during which you open your mouth and breathe deeply. The average duration of a yawn is about 6 seconds. The purpose and cause of yawning are still a mystery. Scientists are not sure what causes a yawn. People yawn when they are tired or bored, but they also yawn when they aren’t. There are many ideas explaining why we yawn. One idea is that yawning is a way for the body to become more alert by taking in more oxygen. A yawn increases the heart rate, forces carbon dioxide out of the lungs and blood stream, and brings oxygen to the brain. But one study showed that volunteers given a lot of oxygen did not yawn any less than before, while those given a lot of carbon dioxide did not yawn more. Another idea is that early humans used yawning as a form of communication. If one decided it was time to sleep, they would tell the others by yawning and they would do it in return to show they agreed. A third explanation comes from psychology professor Gordon Gallup of University at Albany in New York. He said that as people yawn, they cool off their brains. “Brains are like computers.” he said. “They only operate efficiently and effectively when they’re cool. Many things connected to yawning, like being tired, make the brain hot, and yawning can reduce the heat.” Scientists have sent people into space, and created terrible nuclear weapons, but there are lots of seemingly simple things, such as why we yawn, or hiccup(打嗝), that they can’t figure out. Next time you are in class in the morning, let out a big yawn and watch to see how many of your classmates yawn in response! 小题1:What’s the purpose of the description of how bad you may feel when you’re woken up in the morning?
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小题1:C
小题2:A
小题3:C
小题4:B
have to ring him up first ,can you wait a few minutes It [ ]
I have to ring him up first,can you wsit a fow minntes?it wo
remember to ring me up as soon as you get to Beijing.同义句
Remember to ring me up as soon as you get to beijing改为同义句
①Remember to ring me up as soon as you get to London.(改为同义句)
英语翻译When you get up in the morning,do you find it hard to ch
When you get up in the morning,do you find it hard to choose
Can you remember who -------(teach) you to ride a bike when
Remember to ring me up as soon as you arrive in Beijing(改为同义
When you wake up every day,remember to smile.
When you wake up in the morning,set a goal that today you mu
i can ring you up down