题目
题型:不详难度:来源:
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 |
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 |
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。核心考点
试题【Since people first sent rockets into space in the 1950s, we have been leaving be】;主要考察你对题材分类等知识点的理解。[详细]
举一反三
★ 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. |
A.学习 | B.研究 | C.书房 | D.教室 |
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. |
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. |
A.How to become a better student. | B.How to plan your time. |
C.How to study English. | D.How to take notes. |
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 |
A.Think beyond academics. |
B.Learn each concept. |
C.Plan a trip to use your skills. |
D.Consider a language as a tool. |
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 |
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. |
A.Entertainment. | B.History. | C.Education. | D.Nature. |
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.temperature | B.water | C.oxygen | D.temperature , water and oxygen |
A.the sun | B.the earth | C.the moon | D.Mars |
A.Mars . | B.Moon . | C.Sun . | D.Mars and Moon . |
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 . |
A.Living Things on Our Earth | B.The Moon |
C.Living Things on the Moon | D.Mars Is Most Like the Earth |
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. |
A.Caronite. | B.Dropbox. | C.SkyDrive. | D.Flash drive. |
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 |
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. |
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, c | B.b, c, d | C.c, d, e | D.a, d, e |
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 |
A.Defensive. | B.Doubtful. | C.Negative. | D.Objective |
最新试题
- 1假设你是李华,请你根据下列要点,用英文给玛丽回一封电子邮件,建议她来你所在的学校作交换生。理由是:1.你校每年都接纳交换
- 2某人突发高烧, 医生会建议先服用一些解热镇痛药物。下列药品中可用作退烧药的是A.阿司匹林B.三硅酸镁C.环丙沙星D.阿莫
- 3如图中的抛物线关于x轴对称的抛物线的表达式为______.
- 4【题文】诗人左思在其《咏史》中沉郁悲歌:“世胄蹑高位,英俊沉下僚。地势使之然,由来非一朝。”造成这一社会状况的制度原因是
- 5过点A(-1,10)且被圆x2+y2-4x-2y-20=0截得的弦长为8的直线方程是______.
- 6使用滑轮组肯定不能做到的是A.既省力又改变力的方向 B.既省力又省距离C.省力但不能改变力的方向 D.不省力但可以改变力
- 7在历史学习中,我们经常会碰到“历史现象”与“历史结论”的区别问题。“历史结论”是在对历史现象的理性认识和基本判断基础上形
- 8Bill won"t make any progress______ he studies harder than be
- 9默写古诗文句子(每条横线上填写一句)。(1)海内存知己,_____________。(2)问渠那得清如许?_______
- 10用科学记数法表示1304000,应是______.
热门考点
- 1【题文】帝王的谥号主要依据其生前行为而定;庙号是皇帝死后,在太庙立室供奉时特起的名号;年号是纪年的名称。下列各项中属于年
- 2图表示人体内某处气***换的过程:(1)已知A是体内气***换的主要器官,则A的名称是______,在A中与血液进行气***换
- 3下列划线成语使用不当的一项是[ ]A、他是一个认真的人,事无巨细都一丝不苟的完成。B、保尔把一生都献给了社会主义
- 4主要分布在东半球的有亚洲、欧洲、非洲和大洋洲.______.(判断对错)
- 5如图,已知:∠1=∠2,那么下列结论正确的是( )A.∠C=∠DB.AD∥BCC.AB∥CDD.∠3=∠4
- 6某商店出售茶杯、茶壶,茶杯每只定价4元,茶壶每只定价20元;该商店的优惠办法是买一只茶壶赠一只茶杯,某顾客欲购买茶壶5只
- 7在曲线y=x3+x-1上求一点P,使过P点的切线与直线4x-y=0平行.
- 8阅读下文,回答问题。 地之子 李广田我是生自土中,来自田间的, 这大地,我的母亲,我对她有着作为
- 9胡锦涛同志在十七大报告中指出,应加强能源资源节约和生态环境保护,增强可持续发展能力。下列行为与之不相符的是 [
- 10等差数列的前n项和为=( )A.18B.20C.21D.22