The surprising experiment I am about to describe proves that air is all around you and that it proves down upon you.Air pressure is a wonderful force.When you swim underwater, you can feel water push down your body.The air all around you does the same.However, your body is so used to it that you do not notice this.The pressure is caused by a layer of air called the atmosphere.This layer surrounds the Earth, extending to about five kilometers above the Earth's surface.
The following experiment is an easy one that you can do at home.But make sure that you are supervised, because you will need to use matches.
What you need
·A hard-boiled egg without the shell
·A bottle with a neck slightly smaller than the egg
·A piece of paper
·A match
Method
1)Check that the paper will sit firmly on the neck of the bottle.
2)Tear the paper into strips and put the strips into the bottle.
3)Light the paper by dropping a burning match into the bottle.
4)Quickly sit the egg on the neck of the bottle.
Result
Astonishingly, the egg will be sucked into the bottle.Your friends will be amazed when you show them the experiment.But be careful when you handle matches.
Why it happened
As the paper burns, it needs oxygen and uses up the oxygen (air)in the bottle.The egg acts as a seal in the neck of the bottle, so no more air can get inside.This reduces the air pressure inside the bottle.The air pressure must equalize, so more air from outside must enter the bottle.The outside air presses against the egg and then the egg is pushed into the bottle! That proves that air is all around and that it is pressing down on it.
小題1:Why is there the need to take care when you are doing the experiment?
A.The bottle could break.
B.You need to light the paper with a match.
C.The egg needs to be shelled.
D.The egg has to be perfectly placed on the neck of the bottle.
小題2:In the experiment, the burning inside the bottle can__.
A.equalize the air pressure inside and outside
B.make a seal in the neck of the bottle
C.finish up the oxygen inside the bottle
D.produce more oxygen inside the bottle
小題3:How did the egg put into the bottle?
A.The oxygen inside the bottle sucked the egg in.
B.It became salt without the shell.
C.The neck of the bottle was wide enough.
D.The outside air pressure forced it into the bottle.
小題4:The experiment is carried out to prove ____.
A.water pushes on your body when you swim underwater
B.the earth is surrounded by a layer of air called the atmosphere
C.the pressure of air around us has a powerful force
D.the air pressure is not equalized around us

小題1:B
小題2:C
小題3:D
小題4:C

小題1:細(xì)節(jié)理解題。從Result下面的But be careful when you handle matches可以作出判斷。
小題2:細(xì)節(jié)理解題,從Why it happened下面的As the paper burns, it needs oxygen and uses up the oxygen (air)in the bottle可以判斷瓶子內(nèi)部的氧氣被消耗殆盡。
小題3:細(xì)節(jié)理解題。從Why it happened下面的The outside air presses against the egg and then the egg is pushed into the bottle!可以作出判斷。
小題4:主旨大意題,文章第一句話The surprising experiment I am about to describe proves that air is all around you and that it proves down upon you.開門見山,提出了寫作的目的。
練習(xí)冊系列答案
相關(guān)習(xí)題

科目:高中英語 來源:不詳 題型:閱讀理解

Somehow Rey had managed to struggle free from the rope around his neck, after being left to die a slow death as punishment for being a bad Spanish greyhound(獵狗).

20090506

 
It is believed that 50,000 greyhounds are killed by their owners in Spain each year after they grow too old, or turn out to be too slow to hunt with.Dogs have also been found thrown into wells, burnt alive and even injected with poison.

But Rey's intended fate(命運(yùn)) was, even within the levels of cruelty usually shown to Spanish hunting dogs, especially cruel.The rope around his neck had been set at a height so that his front paws could not touch the ground, meaning that he was intended to stand on his back legs until he was too tired to support himself.When his legs finally became too tired, the rope should have done its work.
"They call it the typewriting death, because the dog's back legs struggled against the ground and make the clicking sound of a typewriter," said Albert Sorde, of the SOS Galgos greyhound rescue group."It is a punishment for greyhounds that are thought to have made their owners lose face."
"Rey's throat was severely damaged but we managed to find a vet to operate and, though it was expensive, he survived," he said.
Greyhounds in Spain are used for hunting hares(野兔)."The dogs are meant to imitate the swerves(轉(zhuǎn)向)of the hares," said Sorde."Those who don't, and make their owners look bad, are called 'dirty greyhounds' and are most likely to be killed by the typewriter method."  
小題1:Rey was intended to be killed by            
A.kickingB.burying
C.hangingD.drowning
小題2:The underlined word "vet" in(Paragraph 5)probably means  “_________”.
A.a(chǎn)nimal doctorB.a(chǎn)mbulance
C.a(chǎn)nimal medicine D.equipment
小題3:What can you infer from the passage?  
A.Dogs are not kept as pets in Spain.
B.Rey was punished because he had not been loyal to his owner.
C.The typewriting death is named because a typewriter is used in the punishment.
D.Rey didn’t behave very well in the hunting.
小題4:The passage mainly tells the readers about _________.
A.the cruel killing of dogs in Spain
B.how Rey was saved by rescuers
C.how Spanish dogs hunt hares
D.the fate of the dogs in Spain

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

How to Be a Winner
Sir Steven Redgrave
Winner of 5 Olympic Gold Medals
“In 1997 I was found to have developed diabetes (糖尿。. Believing my career (職業(yè)生涯)was over, I felt extremely low. Then one of the specialists said there was no reason why I should stop training and competing. That was it----the encouragement I needed. I could still be a winner if I believed in myself. I am not saying that it isn’t difficult sometimes. But I wanted to prove to myself that I wasn’t finished yet. Nothing is to stand in my way.”
Karen Pickering
Swimming World Champion
“I swim 4 hours a day, 6 days a week. I manage that sort of workload by putting it on top of my diary. This is the key to success—you can’t follow a career in any field without being well-organized. List what you believe you can achieve. “Trust yourself, write down your goals for the day, however small they are, and you’ll be a step closer to achieving them.”
Kirsten Best
Poet & Writer
“When things are getting hard, a voice inside my head tells me that I can’t achieve something. Then, there are other distractions, such as family or hobbies. The key is to concentrate. When I feel tense, it helps a lot to repeat words such as ‘calm’, ‘peace’ or ‘focus’, either out loud or silently in my mind. It makes me feel more in control and increases my confidence. This is a habit that can become second nature quite easily and is a powerful psychological (心理的) tool.”
小題1:What does Sir Steven Redgrave mainly talk about?
A.Difficulties influenced his career.
B.Specialists offered him medical advice.
C.Training helped him defeat his disease.
D.He overcame the shadow of illness to win.
小題2:What does Karen Pickering put on top of her diary?
A.Her training schedule.
B.Her daily happenings.
C.Her achievements.
D.Her sports career.
小題3:What does the underlined word “distractions” probably refer to?
A.Ways that help one to focus.
B.Words that help one to feel less tense.
C.Activities that turn one’s attention away.
D.Habits that make it hard for one to relax.
小題4:According to the passage, what do the three people have in common?
A.Courage.
B.Devotion.
C.Hard work.
D.Self-confidence.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:完形填空

Who won the World Cup 1994 football game? What happened at the United Nations? How did the critics like the new play? 1 an event takes place, newspapers are on the streets 2 the details.Wherever anything happens in the world, reports are on the spot to 3 the news.
  Newspapers have one basic 4 , to get the news as quickly as possible from its source, from those who make it to those who want to 5 it.Radio, telegraph, television, and 6 inventions brought competition for newspapers.So did the development of magazines and other means of communication. 7 , this competition merely spurred the newspapers on.They quickly made use of the newer and faster means of communication to improve the 8 and thus the efficiency of their own operations.Today more newspapers are 9 and read than ever before.Competition also led newspapers to branch outsintosmany other fields.Besides keeping readers 10 of the latest news, today's newspapers 11 and influence readers about politics and other important and serious matters.Newspapers influence readers' economic choices 12 advertising.Most newspapers depend on advertising for their very 13 .Newspapers are sold at a price that 14 even a small fraction of the cost ofproduction.The main 15 of income for most newspapers is commercial advertising.The 16 in selling advertising depends on a newspaper's value to advertisers.This 17 in terms of circulation.How many people read the newspaper? Circulation depends 18 on the work of the circulation department and on the services or entertainment 19 in a newspaper's pages.But for the most part, circulation depends on a newspaper's value to readers as a source of information 20 the community, city, country, state, nation, and world—and even outer space. 1.A.Just when B.While C.Soon after D.Before
2.A.to give B.giving C.given D.being given
3.A.gather B.spread C.carry D.bring
4.A.reason B.cause C.problem D.purpose
5.A.make B.publish C.know D.write
6.A.another B.other C.one another D.the other
7.A.However B.And C.Therefore D.So
8.A.value B.ratio C.rate D.speed
9.A.spread B.passed C.printed D.completed
10.A.inform B.be informed C.to be informed D.informed
11.A.entertain B.encourage C.educate D.edit
12.A.on B.through C.with D.of
13.A.forms B.existence C.contents D.purpose
14.A.tries to cover B.manages to coverC.fails to cover D.succeeds in
15.A.source B.origin C.course D.finance
16.A.way B.means C.chance D.success
17.A.measures B.measured C.Is measured D.was measured
18.A.somewhat B.little C.much D.something
19.A.offering B.offered C.which offered D.to be offered
20.A.by B.with C.at D.about

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

nickname is a shortened form of a person's name. A nickname also can be a descriptive name for a person, place or thing. Many American cities have nicknames. These can help establish an identity, spread pride among citizens and build unity.
A few years ago, some marketing and advertising experts were asked to name the best nickname for an American city. The winner was the nation's largest city, New York. The top nickname was The Big Apple.
You might wonder how New York got this nickname. In the early nineteen seventies, the city had many problems. The number of visitors was falling. So a campaign was launched to give the city a new image. The head of the New York Conventions and Visitors Bureau decided to call the city, The Big Apple.
There are several explanations for where this name came from. Language expert Barry Popik studied the question and wrote about it on his Web site. He says John Fitz Gerald, a writer for a New York newspaper, used the name The Big Apple to mean New York in the nineteen twenties. Mister Fitz Gerald wrote about horse races. He heard the name used by men who worked at a racetrack in New Orleans, Louisiana.
Mister Fitz Gerald wrote: "The Big Apple. The dream of every lad that ever threw a leg over a thoroughbred and the goal of all horsemen. There's only one Big Apple. That's New York."
In horse racing, the expression meant "the big time," the place where large amounts of money could be won. The Big Apple became the name of a night club in the Harlem area of New York City in nineteen thirty-four. It also was the name of a popular dance and a hit song in the nineteen thirties.
But it is not the only nickname for America's largest city. Barry Popik's web site lists almost one hundred nicknames that describe New York. The best known are The Capital of the World. Empire City. Gotham. The City So Nice They Named it Twice. And, The City That Never Sleeps. You can hear about the city in the song, "New York, New York," by Frank Sinatra.
小題1:Why do many American cities have nicknames?(回答詞數(shù)不超過15個)
小題2:What did John Fitz Gerald write about for the New York newspaper?(回答詞數(shù)不超過5個)
小題3:Besides “The Big Apple”, how many best known nicknames that describe New York are listed according to Barry Popik's web site?(回答詞數(shù)不超過2個)

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解


Nowadays people are troubled by the violence that spreads throughout the media. Movies, television and video games are full of gunplay and bloodshed, and one might reasonably ask what’s wrong with a society that presents videos of violence as entertainment.
Viewing large amounts of violent television and video games may well contribute to violent behavior in certain individuals. The trouble comes when researchers downplay uncertainties in their studies or overstate the case for causality(因果關(guān)系). Skeptics were dismayed several years ago when a group of societies including the American Medical Association tried to end the debate by issuing a joint statement: “At this time, well over 1,000 studies… point to a causal connection between media violence and aggressive behavior in some children.”
Freedom-of-speech advocates accused the societies of catering to politicians, and even disputed the number of studies (most were review articles and essays, they said). When Jonathan Freedman, a social psychologist at the University of Toronto, reviewed the literature, he found only 200 or so studies of television-watching and aggression. And when he weeded out “the most doubtful measures of aggression”, only 28% supported a connection.
The critical point here is causality. The alarmists say they have proved that violent media cause aggression. But the assumptions behind their observations need to be examined. When labeling games as violent or non-violent, should a hero eating a ghost really be counted as a violent event? And when experimenters record the time it takes game players to read “aggressive” or “non-aggressive” words from a list, can we be sure what they are actually measuring? The intention of the new Harvard Center on Media and Child Health to collect and standardize studies of media violence in order to compare their methodologies, assumptions and conclusions is an important step in the right direction.
Another appropriate step would be to tone down the criticism until we know more. Several researchers write, speak and testify quite a lot on the threat posed by violence in the media. That is, of course, their privilege. But when doing so, they often come out with statements that the matter has now been settled, drawing criticism from colleagues. In response, the alarmists accuse critics and news reporters of being deceived by the entertainment industry. Such clashes help neither science nor society.
小題1:Why is there so much violence shown in movies, TV and video games?
A.Showing violence is thought to be entertaining.
B.Something has gone wrong with today’s society
C.Many people are fond of gunplay and bloodshed.
D.There is a lot of violence in the real world today.
小題2:What is the skeptics’ view of media violence?
A.Violence on television is fairly accurate reflection of real-world life.
B.Most studies exaggerate (夸大) the effect of media violence on the viewers.
C.A causal relationship exists between media and real-world violence.
D.The influence of media violence on children has been underestimated.
小題3:The author uses the term “alarmists” to refer to those who _________.
A.use standardized measurements in the studies of media violence
B.initiated the debate over the influence of violent media on reality
C.insist on a direct link between violent media and aggressive behavior
D.use appropriate methodology in examining aggressive behavior
小題4:The underlined phrase “weeded out” in Paragraph 3 most probably means _________.
A.got rid of things that are not good B.removed unwanted parts from something
C.picked out things that are useful D.took away unnecessary details of a report
小題5:What does the writer think of the debate concerning the relationship between the media and violence?
A.He more than agrees with the views held by the alarmists.
B.It should come to an end since the matter has now been settled.
C.The past studies in this field have proved to be misleading.
D.More studies should be conducted before conclusions are drawn.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

The Internet has led to a huge increase in credit-card (信用卡) fraud. Your card information could even be for sale in an illegal web site(非法網(wǎng)站).
Web sites offering cheap goods and services should be regarded with care.
On-line shoppers who enter their credit-card information may never receive the goods they thought they bought. The thieves then go shopping with your card number — or sell the information over the Internet. Computers hackers(黑客) have broken down security(安全) systems, raising questions about the safety of cardholder information. Several months ago, 25, 000 customers of CD Universe, an on-line music retailer(零售商), were not lucky. Their names, addresses and credit-card numbers were posted on a Web site after the retailer refused to pay US $157, 828 to get back the information.
Credit-card firms are now fighting against on-line fraud. Mastercard is working on plans for Web — only credit card, with a lower credit limit. The card could be used only for shopping on-line. However, there are a few simple steps you can take to keep from being cheated(欺騙).
Ask about your credit-card firm’s on-line rules: Under British law, cardholders have to pay the first US $78 of any fraudulent(欺騙性的) spending.
And shop only at secure sites; Send your credit-card information only if the Web site offers advanced secure system.
If the security is in place, a letter will appear in the bottom right-hand corner of your screen. The Website address may also start https: //—the extra “s” stands for secure. If in doubt, give your credit-card information over the telephone.
Keep your password(密碼) safe: Most on-line sites require a user name and password before placing an order. Treat your passwords with care.
小題1:What do most people worry about the Internet according to this passage?
A.A lot of stolen credit-cards were sold on the Internet.B.Fraud on the Internet.
C.Many Web sites are destroyed.D.Many illegal Web sites are on the Internet.
小題2:What is the meaning of “fraud”?
A.Cheating.B.Sale. C.Payment. D.Safety.
小題3: How can the thieves get the information of the credit card?
A.The customers give them the information.
B.The thieves steal the information from Web sites.
C.The customers sell the information to them.
D.The thieves buy the information from credit-card firms.
小題4:How many pieces of advice does the passage give to you?
A.Four.B.Three.C.Five.D.Six.
小題5:You are shopping on the site: http: // www. Shopping. com, and you want to buy a TV set, what does this article suggest to do?
A.Order the TV set at once.B.Do not buy the TV set on this site.
C.E-mail the site your credit-card information.
D.Tell the site your password and buy the TV set for you.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

Taiwan police cannot decide whether to treat it as an extremely eleven act of stealing or an even cleverer cheat . Either way , it could be the perfect crime (犯罪), because the criminals are birds—horning pigeons !
The crime begins with a telephone message to the owner of a stolen car : if you want the car back, pay up then, the car owner is directed to a park, told where to find a bird cage and how to attach money to the neck of the pigeon inside . Carrying the money in a tiny bag , the pigeon flies off .
There have been at least four such pigeon pick-ups in Changwa. What at first seemed like the work of a clever stay-at-home car thief, however , may in face be the work of an even lazier and more inventive criminal mind—one that avoid (避免)not only colleting money but going out to steal the car in the first place . Police officer Chen says that the criminal probably has pulled a double trick: he gets money for things he cannot possibly return . Instead of stealing cars , he lets someone else do it and then waits for the car-owner to place an ad (啟事) in the newspaper asking for help .
The theory is supported by the fact that , so far , none of the stolen cars have been returned . Also, the amount of money demanded-under 3,000 Taiwanese dollars –seems too little for a car worth many times more .
Demands for pigeon-delivered money stopped as soon as the press reported the story. And even if they start again, Chen holds little hope of catching the criminal . “We have more important things to do, ” he said .
1.After the car owner received a phone call. He          
A.went to a certain pigeon and put some money in the bag it carried
B.gave the money to the thief and had his car back in a park
C.sent some money to the thief by mail
D.told the press about it
2.The “l(fā)azier and more inventive” criminal refers to          .
A.the car thief who stays at home     
B.one of those who put the ads in the paper
C.one of the policemen in Changwa  
D.the owner of the pigeons
3.The writer mentions the fact that “none of the stolen cars have been returned” to show       .
A.how easily people get fooled by criminals
B.what Chen thinks might be correct
C.the thief is extremely clever
D.the money paid is too little
4.The underlined word “they” in the last paragraph refers to          .
A.criminals            B.pigeons
C.the stolen cars    D.demands for money
5.We may infer from the text that the criminal knows how to reach the car owners because     .
A.he reads the ads in the newspaper  
B.he lives in the same neighborhood
C.he has seen the car owners in the park 
D.he has trained the pigeons to follow them

查看答案和解析>>

科目:高中英語 來源:不詳 題型:完形填空

完形填空(共20小題,每小題1分,滿分20分)
Every year, almost 2 million Americans are injured while they're  21 work every day, 240 are killed on the job. The   22   job is cutting down trees. Being a policeman is safer than many jobs, including driving a truck, collecting garbage and   23  airplanes. One of the safest jobs is being a librarian.
The government inspects(檢查) most factories and offices.  24 have to   25   fines(罰款) if their factories or offices are unsafe. In California, employers often go to prison if one of their workers is  26  because a factory didn't  27 safety measures. But President Bush cut down the number of government inspectors(檢查員)  28 15 percent.   29 , many people say working is less safe now.
For women workers, the greatest danger so far is murder. Forty--two percent of all  30 who died at work were killed. Many of them work  31 clerks in stores   32 they are alone at night. Experts say they can protect themselves by putting the cash desk in full   33  .
The numbers of deaths and accidents at work don't take into  34 people who become sick from   35   that they are exposed to (暴露)at work. Doctors don't know   36 some chemicals cause illness.There are no government rules for many new chemicals.
Inspectors say employers  37 their backs on safety problems because they don't want to pay the bill for fixing them. They also say some workers don't want to complain about dangers because they may  38  their jobs.
The government should force business to improve safety. There's no   39 for workers dying or  40 in an accident that could have been prevented.
21. A. in           B. at             C. on               D. during
22. A. safest        B. most dangerous   C. easiest            D. most tiring
23. A. flying        B. making         C. doing             D. riding
24. A. Officers      B. Workers         C. Employers        D. Employees
25. A. give         B. offer            C. pay              D. buy
26. A. saved        B. hit             C. shot              D. killed
27. A. use          B.do              C. break            D. take
28. A. to           B. by              C. from            D. at
29. A. As a result    B. As              C. At last            D. Then
30. A. adults        B. youths          C. men              D. women
31. A. for          B. as              C. like               D. to
32. A. which        B. that             C. where            D. why
33. A. view         B. opinion         C. scene              D. scenery
34.A thought       B mind           C thinking            D consideration
35. A. machines     B. chemicals        C. air                D. work
36. A. because      B. when            C. whether            D. even if
37. A. do          B. turn             C. make              D. refuse
38. A. lose         B. miss             C. give up            D. save
39. A. need         B. reason           C. time             D. excuse
40. A. injuring      B. being injured      C. be injuring         D. be injured 

查看答案和解析>>

同步練習(xí)冊答案