A. | two-month | B. | two-months | C. | two months | D. | two month |
科目:初中英语 来源:2017届浙江海宁新仓中学九年级下期开学考试英语试卷(解析版) 题型:阅读理解
What is the first thing you want to do when you see someone yawn(打哈欠)? You want to yawn, too! Yawning is contagious.
Scientists have found that all people yawn. Babies start to yawn even before they are born. The earliest yawn takes place when a baby is still inside its mother. When young children are about one year old, they start to yawn when they see others yawning. That's why scientists seem to think yawning is contagious.
It’s no secret that yawning is contagious, but why do we yawn? Well, scientists are not really sure.
Some think we yawn because we feel bored. Recently scientists studied two groups of students between the ages of 17 and 19. One group watched music videos, and the other watched a boring color test. Scientists compared the numbers of their yawns and found that the color test group yawned more times than the video group.
Another reason about yawning has to do with breathing. Some scientists believe that when we are bored or tired, we breathe more slowly. As our breathing slows down, we cannot get rid of(去除) enough carbon dioxide (CO2) in our bodies. When there is too much carbon dioxide, our bodies will tell the brains (大脑) to breathe deeply. The result is a big yawn.
In 2007, scientists suggested a new reason. They said that the reason people yawned was to cool down their brains. These scientists found that people who were warmer than others yawned more often.
Scientists are still trying to find out why yawning happens and why it is so contagious. But they are only sure that when one person yawns, almost everyone else nearby wants to yawn, too.
1.According to the scientists, people start to yawn when they are .
A. born
B. inside their mothers
C. 17 or 19 years old
D. one year old
2.Which of the following are the possible reasons about yawning according to the passage?
People yawn because they are bored.
People yawn to catch others' attention.
People yawn to cool down their brains.
People yawn to get rid of carbon dioxide.
A. B. C. D.
3.We can probably read this passage in a _ _.
A. story book B. travel guidebook
C. science magazine D. movie poster
查看答案和解析>>
科目:初中英语 来源:2016-2017学年江苏启东市七年级下期开学考试英语试卷(解析版) 题型:单项填空
--- _________ your mother free at the weekend?
--- NO. She ________ has much work to do.
A. Does; always B. Is;always
C. Does; seldom D. Is; seldom
查看答案和解析>>
科目:初中英语 来源:2016-2017学年江苏启东市七年级下期开学考试英语试卷(解析版) 题型:单项填空
--- What’s _______ biggest country in the world?
--- Russia! It’s _____ country with many big cities.
A. the; a B. a; the C. the; the D. a; a
查看答案和解析>>
科目:初中英语 来源: 题型:选择题
A. | Neither I can | B. | Neither can I | C. | So I can | D. | So can I |
查看答案和解析>>
科目:初中英语 来源: 题型:选择题
A. | speak | B. | to speak | C. | spoken | D. | speaking |
查看答案和解析>>
科目:初中英语 来源: 题型:选择题
A. | find,look at | B. | look at,see | ||
C. | look for,look at | D. | find,see |
查看答案和解析>>
科目:初中英语 来源: 题型:选择题
A. | far | B. | farther | C. | farthest | D. | the farthest |
查看答案和解析>>
湖北省互联网违法和不良信息举报平台 | 网上有害信息举报专区 | 电信诈骗举报专区 | 涉历史虚无主义有害信息举报专区 | 涉企侵权举报专区
违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com