题目
题型:不详难度:来源:
Why do airplanes take longer to fly west than east?
It can take five hours to go west-east from New York (NY) to London but seven hours to travel east-west from London to NY. The reason for the difference is an atmospheric phenomenon (大气现象) known as the jet stream (气流). The jet stream is a very high altitude (=" above" sea level) wind which always blows from the west to the east across the Atlantic. So the planes moving at a constant air speed go faster from the west to the east when they are moving with the wind than in the opposite.
What would happen if the gravity on Earth was suddenly turned off?
Supposing we could magically turn off gravity. Would buildings and other buildings float away? What happened would depend on (依靠) how strongly the things were attached (吸附) to the earth. The earth is moving at quite a speed, moving at over a thousand miles per hour. If you turn something around your head on a string, it goes around in a circle until you let go of the string. Then it flies off in a straight line. ‘Turning off’ gravity would be like letting go of the string. Things not attached to the earth would fly off in a straight line. People in buildings would suddenly shoot upwards at a great speed until they hit the ceiling (=" top" surface of a room). Most things outside would fly off into space.
小题1:What information can we get from the first passage?
A.It is the jet stream that affects how fast airplanes fly. |
B.Planes go slower when they are moving with the wind. |
C.It takes more time to fly from NY to London than from London to NY. |
D.The jet stream always blows from the east to the west across the Atlantic. |
A.send for | B.move quickly | C.come out | D.grow quickly |
A.buildings and other structures would float away |
B.trees and buildings would not so easily fly off |
C.something around your head would not float away |
D.everything outside buildings would fly off into space |
A.It takes seven hours to travel from London to New York. |
B.The earth is moving at a high speed. |
C.Things on the earth will float away if there’s no gravity. |
D.Things not attached to the earth would fly off in a straight line. |
A.In a research paper. | B.In a short story. |
C.In a travel magazine. | D.In a student’s book |
答案
小题1:A
小题2:B
小题3:B
小题4:C
小题5:D
解析
试题分析:这篇短文主要介绍了飞机为什么向西面飞比向东面飞花的时间更长的原因是气流的方向。还介绍了没有了地球引力会发生什么。
小题1:归纳总结题。根据短文第一段主要讲述了飞机为什么向西面飞比向东面飞花的时间更长的原因是气流的方向,故选A。
小题2:词意猜测题。A派人去请B快速运动C出来D快速生长,根据第二段People in buildings would suddenly shoot upwards at a great speed until they hit the ceiling (=" top" surface of a room). Most things outside would fly off into space.描述在建筑里的人会突然以一个巨大的速度向上移动直到他们撞上天花板。很多东西会飞到外太空。故选B
小题3:推理判断题。根据第三段What happened would depend on (依靠) how strongly the things were attached (吸附) to the earth.描述发生了什么将取决于东西连接到地球上有多结实。再根据后面描述可知树以及建筑不像其他物品那样容易飞出。故选B
小题4:细节理解题。根据短文描述,只提出了问题:关掉引力,建筑和其他东西会漂走吗?没有提及没有引力地球上的东西将会漂移。故选C。
小题5:出处猜测题。根据四个选项,A研究论文B小故事C旅游杂志D学生课本,这是一篇科普短文,有可能来自学生课本,故选D。
核心考点
试题【Have you ever wondered?Why do airplanes take longer to fly west than east?It can】;主要考察你对科普环保类等知识点的理解。[详细]
举一反三
Every day, Mr Xie goes to Dongzhimen Bus Stop, and gives help to at least 1,200 people asking for directions. During holidays, the number may be even 3,500. There are more than 50 roads and streets meeting at Dongzhimen, and at least 100 thousand people pass by there daily.
The reporter of Beijing Youth Daily had an interview with Xie. At that time, he arrived at the bus stop and placed his little table with maps and guidebooks written by himself on it.
"Is it really free to ask you for the way?" said a person from southeast China
"Of course," answered Xie with a smile. "Quite a number of people have asked me the same question. I am a volunteer."
The reporter found that at least 5 people came to ask him for the way in a minute, and Xie told them the way patiently and gave every one of them a note with his words on it.Xie has a husky voice. People think that it"s because of the result of the things he is doing.
Now Xie has encouraged several other volunteers to join him. Many people hope to do volunteering like Xie, but it"s hard to do as well as he does.
小题1:Xie Lang directs the ways for people at the bus stop as .
A.a driver | B.a reporter | C.a guide | D.a volunteer |
A.5 | B.1,200 | C.3,500 | D.100,000 |
A.calling a taxi for them |
B.driving them to the right place |
C.giving them maps or guidebooks to read by themselves. |
D.telling them the right way or writing the way on a note. |
A.No other volunteers help Xie Liang now. |
B.Xie Liang has written some guidebooks on his own. |
C.People don’t need to pay Xie Liang for asking for directions. |
D.Xie Liang’s voice is bad because he has to talk with so many people every day. |
Warmer Weather Brings Germs
The world’s weather is changing. Cooler countries are getting warmer, so insects from hot countries can move there. Some of these insects, like mosquitoes, carry dangerous germs. These germs cause headaches, fever, and can even kill people.
Under Your Skin
Your skin protects you from germs. It stops some germs, but not all. They can enter your body when you eat, or when you have a cut. Germs are on your hands, too. They enter your body when you touch your eyes, nose, or mouth.
Fighting Germs
Your immune system protects you, too. When germs get inside your body, your immune system finds and kills them. Special cells(细胞) move around your body and fight germs. They help you stay healthy. Other cells make antibodies. Antibodies help your body find and stop germs. What can you do to fight germs? You should wash your hands with soap and water. Soap kills many germs, and water washes them away.
小题1:According to the passage, insects .
A.kill germs | B.carry germs | C.protect germs | D.love germs |
A.cooler countries | B.hot countries | C.everywhere | D.the world |
A.All germs are dangerous | B.There are more germs in cold places |
C.Soup can kill all germs | D.Germs can get into your body |
A.消化 | B.神经 | C.免疫 | D.分泌 |
A.Germ are everywhere | B.Weather in Changing |
C.Skin stops germs | D.Germs are developed |
But, in fact, even if a comet did hit the earth, nothing much happened. A comet is really a harmless (无害的)thing.
Comets have round heads and long tails , and they are very bright. Sometimes they look like heads with long hair flying with them. That’s why they’re called comets. Comet means long-haired.
Like the stars and planets, comets are far away. But we can know its size. The head of a small comet is as wide as the Pacific Ocean. And a big comet’s head is ten times as big as the earth. Its tail is millions of kilometers long. Then why wouldn’t the great big thing hurt us if it hit the earth? Because it isn’t solid. It’s thin like cloud. Its tail is nothing but bright gas. And its head is made of small pieces and they could not hurt the earth.
Some comets can be seen for a few months. Then they go away. Some of them come back in a certain number of years. Some are never seen again.
Perhaps these comets that never return have broken into pieces. For some astronomers think that shooting stars(流星) are pieces of broken comets.
小题1:People were afraid ________.
A.comets are different from planets |
B.comets travel in the sky |
C.comets are much bigger than the earth |
D.comets could hit the earth |
A.long hair | B.round heads | C.round dishes | D.wide wings |
A.water | B.solid | C.gas | D.small stones |
A.心理学家 | B.艺术家 | C.天文学家 | D.考古专家 |
A.A comet is a kind of planets. |
B.Comets are all ten times as big as the earth. |
C.People can hardly see comets. |
D.Shooting stars may come from the broken comets. |
Recent years , with the development of the computer and the Internet, many students often use computers to surf the Internet . Should students be allowed to surf the Internet? Here are some people’s opinions . | |
Tracy | I study in a junior high school . I think students shouldn’t be allowed to surf the Internet . Surfing the Internet wastes a lot of time , so the students spend less time doing their homework . Also many students lose themselves in playing the computer games . In their minds , games are everything and they keep on playing the games for hours . That’s too bad for their study and their health . |
Jimmy | I don’t agree with Tracy . In my opinion , surfing the Internet can help us a lot . For example , I often get help from the Internet . I’m weak in learning English . When I have trouble in learning English, I can get on line to ask for help . Always I can get the answers soon . In this way , I have made great progress .Thanks to the Internet . |
Jeff | Yes , I have the same opinion as Jimmy . My son , Bob studies very hard . After hours of working hard , he usually feels tired . If he goes on with his study , he will feel stressed out . So I often ask him to surf the Internet to listen to some light music . It can help him relax and he will study better later on . |
What’s your opinion ? Do you agree with them ? Welcome to share your ideas with us ? |
How many opinions can we see in the form ? | 小题1: | |
Where does Tracy study ? | 小题2: | |
What do many students lose themselves in ? | 小题3: | |
What is Jimmy weak in ? | 小题4: | |
What does Bob often do on the Internet ? | 小题5: | |
If you are writing or studying, it makes much difference where the light comes from. People use and pens every day. They have to be very careful about the way of the light because the light shines on their work.Every gets its light either from daylight the window from the lamps or electricity, no matter what kind of light it is, the way it shines towards our books or work is very important to the eyes.
Take a book and sit with your toward the window, and try to read. Your shadow(影子) falls all over the page and makes it for your eyes as if you were in a room.
Now turn around and face the window. The page is shadow again, while the bright light is in your eyes.
Try sitting with your side toward the window. This is very good for , but if you were writing, the shadow fall across the page and bother you .
There is another way – sit your left side to the window. Now everything is perfect for writing as well.
Whatever kind of light is in the room, the rule about the right way to sit is the same.
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