Since people first sent rockets into space in the 1950s, we have been leaving be

Since people first sent rockets into space in the 1950s, we have been leaving be

题型:不详难度:来源:
Since people first sent rockets into space in the 1950s, we have been leaving behind all sorts of things. Some of them, like the camera, were lost by astronauts while they did work outside their spaceship. But much of the space junk is made up of little pieces of things that were once bigger objects, until they struck each other and broke apart.
Some things we send into space fall back toward the earth and burn up in the atmosphere. But larger pieces sometimes survive the extreme heat and hit the ground or the ocean at great speeds. So there is always concern that something may fall from the sky and do some harm.
But space junk falling on housetops (屋顶) is not the biggest worry. Scientists are concerned about what happens when an empty rocket strikes another while orbiting (绕轨道飞行) the earth. Two big things become many smaller things. They then hit other things. The pieces get smaller and smaller until they form a cloud of junk that blocks the path of future space vehicles.
So what can be done to clean up the space around our planet? Marco Castronuovo, an Italian researcher, talks about sending a satellite into space that would get very close to some of the larger pieces of space junk. The satellite would connect a small rocket to the useless object. When the rocket explodes, it pushes the junk into a lower and slower orbit, nearer the earth. After a time, the junk burns up in the atmosphere.
Mr. Castronuovo has proposed (提议) using a number of small satellites with robotic arms. One arm would catch the space junk, and another arm would connect the rocket. He imagines that each satellite would jump from one large piece of junk to another. He thinks this method could destroy about ten large objects each year.
Scientists have been concerned about space junk for many years. Right now, the costs of the clean-up have been too great. Mr. Castronuovo says his system could be put in place for a much more reasonable amount of money.
小题1:Much of the space junk _____.
A.was thrown by the astronauts
B.is from broken spaceship
C.is made up of small pieces of things
D.returns to the earth piece by piece
小题2:Scientists are most worried that the space junk _____.
A.will stop the future space vehicles
B.will do harm to the atmosphere
C.will fall on the housetops
D.will burn up in space
小题3:What does Marco Castronuovo think of his system?
A.It can remove space junk completely.
B.It can save a large amount of money.
C.It can create a large amount of space.
D.It can develop robotic technology.

答案

小题1:C
小题2:A
小题3:B
解析

试题分析:文章介绍太空垃圾的形成原因和对太空造成的危害,及如何解决此类问题。
小题1:细节题:从第一段的句子:But much of the space junk is made up of little pieces of things that were once bigger objects, until they struck each other and broke apart.可知大多数的太空垃圾是由小的东西组成的,选C
小题2:细节题:从第三段的句子:The pieces get smaller and smaller until they form a cloud of junk that blocks the path of future space vehicles.可知 科学家担心太空垃圾会阻挡太空飞行器的路,选A
小题3:推理题:从最后一段的句子:Mr. Castronuovo says his system could be put in place for a much more reasonable amount of money.可知Mr. Castronuovo认为他的系统会节约很多钱,答案是 B
点评:文章介绍太空垃圾的形成原因和对太空造成的危害,及如何解决此类问题。文章难度适中,但题目要我们理解有些重点的句子。集中考查了句意理解题和细节题,要求考生有较强的细节理解能力。做题时也可以结合自己的生活常识和经验,再通过逻辑推理和判断。
举一反三
Maybe you are an average(一般的) student. You probably think you will never be a top student. However, anyone can become better if he or she does his or her best. Here are some tips to help you.
★ Plan your time carefully. You should plan your time for things such as eating, sleeping and dressing. Then make a good, regular time for studying. But don’t forget to set enough time for entertainment.
★ Keep your study quiet and clean. The study should have a desk, a chair and some study materials, but no games, no radio and no television! When you sit down to study, you can put your heart into it. Make good use of your time.
★ Listen to everything that the teacher says. Listening carefully in class means less work later. Taking notes will help you remember what the teacher says.
★ After you get home from school, go over your notes. Review the important points. If you know what your teacher is going to discuss next day, read the material. It will help you study better.
★ Develop a good attitude to tests. The purpose of a test is to show what you have learned about a subject. It helps you know what you are not good at. The world will still go on even if you fail in a test, so don’t be too worried.
小题1:How many tips are mentioned in the passage?
A.Three.B.Four.C.Five. D.Six.
小题2:What does the underlined word “study” mean in Chinese?
A.学习B.研究C.书房D.教室
小题3:Which is a good place for studying?
A.A clean and beautiful place.
B.The place with a computer.
C.The place with a television and a radio.
D.A quiet place with a chair, a desk and some study materials.
小题4:Which of the following is NOT true?
A.The purpose of a test is to show what you are good at.
B.After class, you should review what you have learned.
C.You should listen to your teacher and take notes carefully in class.
D.When you plan your time, you should think of the time for eating, sleeping and so on.
小题5:What’s the passage mainly about?
A.How to become a better student.B.How to plan your time.
C.How to study English.D.How to take notes.

题型:不详难度:| 查看答案
If you’re like most students, you may find it challenging to learn a foreign language. However, there are a few tips you can use in order to earn a top grade —— as well as actually use the skills you’ve learned.
One of the most important and basic lessons in dealing with a foreign language is to learn and understand each concept and lesson before moving on to the next one. If you don’t understand one concept but move on to the next chapter anyway, you’re less likely to understand the new material.
Learning a new language is not only an academic tool, but can help you in your everyday life as well. Being good at another language can help you communicate with other people, and help you when traveling to foreign countries, and even make your resume look better.
And it is important to learn correct pronunciation as soon as possible for poor pronunciation can be hard to break. Native speakers of the language as well as others fluent in the language you are learning will appreciate your efforts to learn correct pronunciation.
Gather outside materials such as books, study guides, books on tape, and travel books to aid you in learning the language. Your textbooks can’t possibly teach you everything you need to know, so seeking outside sources is generally a good rule of thumb to keep in mind.
A significant motivator in learning a foreign language is traveling to the country where the language is spoken. That way, you can see firsthand how the language is used, learn the culture, and meet native speakers of the language. Native speakers appreciate sincere attempts of others who take the time to learn their language.
Seek out native speakers of your new language in your school or neighborhood. They can help you with many skills, including pronunciation, and they can provide immediate feedback on your progress.
小题1:This passage is written to        .
A.explain why learning a foreign language is challenging
B.tell us the importance of learning foreign languages
C.tell us some ways of earning a top grade
D.give us some tips on learning foreign languages
小题2:Which of the following can best summarize the main idea of Paragraph 3?
A.Think beyond academics.
B.Learn each concept.
C.Plan a trip to use your skills.
D.Consider a language as a tool.
小题3:We can learn from the passage that           .
A.textbooks are not good for us when learning a foreign language
B.learning pronunciation well from the very beginning is very important
C.poor pronunciation can be easy to break with the help of native speakers
D.seeking too many outside sources will be more harmful than beneficial
小题4:What is suggested doing in the last paragraph?
A.Going on a trip abroad.
B.Practicing with native speakers.
C.Asking for feedback from our teachers.
D.Finding a motivator in learning language.
小题5:In which part of a website would this text probably appear?
A.Entertainment.B.History.C.Education.D.Nature.

题型:不详难度:| 查看答案
The earth is the only planet that scientists are certain has life .What does the earth have that the other planets don’t ? For one thing , the earth has just the right temperature . As the third planet from the sun , the earth seems to be just the right distance away . The planets that are closer to the sun are so hot that their surfaces bake in the sun . The farthest planets are cold balls .
When the earth developed— which scientists believe may have happened about billions of years ago , many gases covered the earth . The gases caused the earth to be hot . But something wonderful happened . The temperature was just right for thick clouds to form . It rained very hard for a very long time . This gave the earth its oceans . Water made it possible for plants to grow . The plants created oxygen in the atmosphere . Oxygen is the gas that humans and animals breathe .
Only one other planet in the solar system seems to be something like the earth . That planet is Mars . Mars is smaller than the earth , and it is quite a bit cooler . But it is not too cold for humans . On some days , the temperatures are as cold as a winter day in the northern United States . If you wore a special spacesuit , you could walk around on Mars . You would have to bring your own air to breathe , though . The air on Mars is too thin to breathe . Mars has the largest volcano in the solar system . It is sixteen miles high . The highest volcano on the earth is five miles high . The most unexpected sight on Mars is dried-up river beds . Scientists believe that Mars was once much wetter that it is now . Does this mean there could have been living things on Mars ? Scientists are not sure , but there has been no sign so far .
小题1:It is the       on the earth that makes life possible .
A.temperatureB.waterC.oxygenD.temperature , water and oxygen
小题2:The underlined phrase “ the third planet ” means       .
A.the sunB.the earthC.the moonD.Mars
小题3:Which planet in the solar system is most like the earth ?
A.Mars .B.Moon .C.Sun .D.Mars and Moon .
小题4:Which of the following is TRUE ?
A.The earth has a history of about 4 million years .
B.There is no air on Mars .
C.The largest volcano on Mars is over three times higher than the highest one on the earth
D.Scientists believe there are living things on Mars .
小题5:The best title for the passage should be        .
A.Living Things on Our EarthB.The Moon
C.Living Things on the MoonD.Mars Is Most Like the Earth

题型:不详难度:| 查看答案
Back those photos up
The images were striking.Homes on the East Coast were washed away by Superstorm Sandy. People were in tears, picking up faded photographs, among their only remaining possessions.
If that doesn"t move you to get serious about safekeeping your lifetime of memories, what will? The digital age offers tools never imaginable before—including one-click access to a lifetime of family photos.
Here is a brochure (手册) on how to back up (存) your photos and save them online, where they can live forever and be accessible in good times and bad.
Scanning
The first step for those old photos is to scan them and save them to a digital format (格式).Most,printers come with scanners these days, so that"s an easy but extremely time-consuming step.
Storing the photos
With your scans in place, import the photos into your computer, and back them up.
You could make multiple copies of the disks and spread them to loved ones.Or you could choose external (外接的) hard drives or USB thumb drive, and add your photo and video collection from your computer.
Online backup
If you need lots of space, look at a pure online backup service, Caronite.
Caronite backs up 300 million files daily.Once you sign up, it starts to pick up everything you have on your hard drive.But photo collection on your computer"s main hard drive charges for $ 59 a year.
Cloud Storage
For folks who don"t need automatic backup, but instead want to take a more active approach, Dropbox, Google Drive and Microsoft"s SkyDrive let you store files online by yourself, share and instantly access them.All offer free options—2GB of free storage for Dropbox, 5GB for Google and 7GB for SkyDrive.But if you want more, you need to pay.
Bottom Line
The hard drive or flash drive is the cheapest and easiest.But drives can fail.Online services are more expensive, but more secure.With more of us switching back and forth between our computers, such services are the best way to get access to our data from wherever we are.
小题1:What can we know from the passage?
A.Scanning photos takes little time but costs a lot.
B.The hard drive or flash drive is the cheapest and safest.
C.Google Drive offers unlimited free photo storage on line.
D.Caronite charges for backing up photos from hard drive.
小题2:Which of the following allows storing files automatically?
A.Caronite.B.Dropbox.C.SkyDrive.D.Flash drive.
小题3:The main purpose of the passage is to ______.
A.tell real stories about storage services
B.introduce some of the storage services
C.describe the functions of storage services
D.argue about the advantage of storage services

题型:不详难度:| 查看答案
Across countryside, non-food crops are growing alongside wheat.Some are used in new alternatives to plastics and other materials, but others will simply be burned.
Burning crops is becoming more popular because it is good for the planet.Doing so is also cheaper than burning fossil fuels.As more land is devoted to non-food crop production, the economics of crops for fuel are likely to become even more favorable.
Humans have been burning such biomass—organic materials from plants or animals— since they discovered fire.But that burning fossil fuels could have catastrophic consequences has brought biomass back into fashion.
Even allowing for emissions (排放) of carbon dioxide from fuel used in planting, harvesting, processing and transporting biomass fuel, replacing fossil fuel with biomass can typically reduce greenhouse gas emissions by more than 90 percent.
Power stations around the world are experimenting with forms of biomass to add to their coal or oil, with encouraging results.Indeed, power companies could profit by turning to biomass, especially when the subsidies (补助) many governments offer for using renewable energy are taken into account.
Farmers can benefit from growing biomass.In Europe, the reduction of subsidies for certain crops is exposing farmers to market forces.Instead of being paid for whatever they produce, farmers must seek a clear demand for their product.Many believe that the demand for alternatives to fossil fuels could be just such a driver.
But while biomass offers a variety of potential alternatives, the world"s infrastructure (基础设施) has developed around burning fossil fuels to such a stage that switching to biomass involves a change in conception that many companies have not accepted.
Also, there are problems with using biomass.Although most coal-fired power stations could take a small amount of their fuel from biomass without significant adjustment, few are built to run on biomass alone.Burning some forms of biomass also causes environmental problems.Oils and waste can be smelly, while wood produces smoke unless burned properly.
The supply chains for fossil fuels are set up well, but those for biomass are just the beginning. Sources of supply for biomass rely on farm production and can therefore be less reliable. They are necessarily limited and it wouldn"t make sense to turn a very large amount of valuable agricultural land away from food crops.But as the world adjusts to the need to control greenhouse gas emissions, these problems may receive more attention.
小题1:What do we know about biomass?
A.It is a useful way of burning crops.
B.It is plant and animal matter used to provide power.
C.It is a new alternative to be used widely.
D.It is a popular approach to fighting against pollution.
小题2:What are the advantages of using biomass?
a.It gives off less greenhouse gases.
b.It helps farmers receive subsidies for what they produce.
c.It has met the clear demand for energy.
d.It has brought subsidies for some power companies.
e.It is cheaper than burning fossil fuels.
A.a, b, cB.b, c, dC.c, d, eD.a, d, e
小题3:For coal-fired power stations, ______.
A.more effective ways to use biomass have been tried
B.using renewable energy has become their daily task
C.burning biomass alone would require considerable changes
D.setting up dependable supply channels needs governments" support
小题4:What is the author"s attitude towards biomass fuels?
A.Defensive.B.Doubtful.C.Negative. D.Objective

题型:不详难度:| 查看答案
最新试题
热门考点

超级试练试题库

© 2017-2019 超级试练试题库,All Rights Reserved.