题目
题型：不详难度：来源：
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 for 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, 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 why 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.
小题1:The underlined word “contagious” in Paragraph 1 means _________.
| A．helpful to our health |
| B．passing from one person to another |
| C．hard to understand |
| D．getting into one trouble after another |
| A．born | B．one year old | C．17 or 19 years old | D．inside their mothers |
①People yawn because they are bored
②People yawn to catch others’ attention
③People yawn to cool down their brains
④People yawn to get rid of carbon dioxide.
| A．①②③ | B．②③④ | C．①②④ | D．①③④ |
| A．storybook | B．travel guidebook | C．movie poster | D．science magazine |
答案
小题1:B
小题2:D
小题3:D
小题4:D
解析
试题分析：本文叙述了当你看见某人打哈欠的时候你第一件事想要做什么？打哈欠是传染的。但是科学家们还没有找到原因，只知道一个人打哈欠，他附近的人也想打哈欠。
小题1:语意猜测题。根据对第一段内容的理解，可知划线部分的意思是从一个人传到另一个人，故选择B。
小题2:细节理解题。根据第二段内容The earliest yawn takes place when a baby is still inside its mother.可知选择D。
小题3:细节理解题。根据对整篇文中的理解，可知人们打哈欠是因为他们感觉累；使他们的大脑冷静下来；并且排除二氧化碳，故选择D。
小题4:细节理解题。根据对这篇文章的理解，可知我们可能在科学杂志是上读到。故选择D。
核心考点
试题【What is the first thing you want to do when you see someone yawn（打哈欠）？You want t】；主要考察你对科普环保类等知识点的理解。[详细]
举一反三
When the traffic lights turn red, we will stop driving a car or crossing a street. Why is red used for traffic lights instead of other colors?
As we know, scattering (散射) happens when light goes through the air. For the same media(媒质), if the wavelength islong, the scattering will be short. If the wavelength is short, then the scattering will be long.
Of all lights we can see red has the longest wavelength, so the scattering is the weakest. That means the red light travels far. In fact, it travels farther on rainy days.
Using the red light can help drivers in farther areas sec the lights. It helps drivers stow down or stop in lime. If drivers don"t see the red light until they are close, they may not be able to stop the car in time. An accident may happen Red can also excite people. We can act more quickly when we see the color red. In a word, red lights help drivers stop in time and help prevent accidents.
小题1:When the traffic lights turn ______, we will stop driving a car.
A. red B green C. yellow
小题2:According to the passage, the scattering of the red light is the _______.
A. longest b. weakest C. farthest
小题3:The underlined word "wavelength" means________ in Chinese.
A.波浪 B.光波 C.波长
小题4:What can the red light help drivers do?
A. It can help drivers in farther areas see the lights.
b. It can help drivers slow down or stop in time.
C. A and b
小题5:Which of the following is the best title?
A. Why do accidents happen
b. How does the red light travel
C. Why do we use red traffic lights
Maybe you think English is very popular in the world, so American students don’t need to learn any other language _____ that’s not true. American kids from the age of seven ____ learn a foreign language. For example ,they learn French or Chinese.
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Now satellites are helping to forecast(预报) the weather . 小题1:______The satellites take pictures of the atmosphere(大气),because this is where the weather forms(形成). 小题2:______So the scientists there can see the weather of any part of the world and tell how the weather will change.
Today, nearly five hundred weather stations in sixty countries can receive satellite pictures. When they receive the new pictures ,they compare(比较) them with the earlier ones . 小题3:_______This may mean that the weather forecast, 小题4:_______
So the weather satellites are of a great help to the scientists at the station. 小题5:________Now they can make good forecasts for 3 or 5 days .Soon perhaps, be able to forecast the weather for a week or more ahead(提前).
| A．In the past they could forecast the weather for about 24 or 48 hours earlier. |
| B．They send these pictures to the weather station . |
| C．they can tell people about it . |
| D．They are in space , and they can reach any part of the world . |
You feel bad if you have no cars. It’s true that cars are . Many people find it hard to think about life will be like if they have no cars. But now more people know that too many cars bring great . They make streets too .
People are trying to stop pollution (污染) from cars. way is to make green cars. But it much to make these cars. And more people think about better ways. We can our lifestyle. A lot of Americans go to work bike now. Riding bikes is clean and healthy. It helps people get strong. Let’s try together! I hope we can live in a green world with no pollution .
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Nowadays, the computer has become a very useful tool to help people to write. As people use computers more often than before, many people have forgotten how to write Chinese characters (字). People often make a lot of mistakes in writing.
At present, China is trying to help pupils and teachers to improve their writing with the help of information technology. With the technology, it is hoped that teachers can write their teaching contents (内容) on the blackboard and students can respond by writing, too.
The Chinese character test shows that nowadays, many college students’ handwriting has become worse. Many college students do not know how to compose (组成) words or sentences in Chinese character in the right way. Not only kids, many adults also have met the same problem. They might be able to tell the general form of a certain character. However, if you ask them to spell out the character in detail (详细地), they can’t. On the other hand, they can easily type out the character on a computer.
In the national language teaching course, we can solve this problem with the use of certain technologies. Actually, apart from（除了）technology, there is a lot that we can do. For example, we may ask students to finish their homework by writing with hands instead of typing.
小题1:People often make a lot of mistakes in writing Chinese characters because ________.
| A．they use computers too often and many people have forgotten how to write them |
| B．Chinese characters are too difficult to write |
| C．they are using too much English |
| D．the country forgets to stress the importance of the Chinese writing |
| A．they don’t know how to write a Chinese character in the right way |
| B．they only know how to type out the character on a computer |
| C．they can write correctly with the help of information technology |
| D．they don’t know how to make up words or sentences in Chinese characters correctly |
| A．By punishing people who can’t write correctly. |
| B．By controlling people’s use of computers. |
| C．By using information technology. |
| D．By asking them to write everything with hands. |
| A．抄写 | B．应答 | C．修改 | D．反对 |
| A．Computers are harmful(对……有害的) to our handwriting. |
| B．How we can write good Chinese characters. |
| C．Chinese people should not forget the skill of writing with hands. |
| D．Don’t forget our mother language. |
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