Force other than damaging winds are also at work inside tornadoes. Sometimes, as the turning, jumping funnel(漏斗) passes over a house, the walls and ceiling burst apart as if a bomb had gone off inside. This explosion(爆炸) is caused by the low air pressure at the center of a tornado.
The pressure at the center of a tornado is usually 13 pounds per square inch. However, inside the house the air pressure is normal, about 15 pounds per square inch. The difference of 2 pounds per square inch between the inside and outside pressure may not seem like much. But suppose a tornado funnel passes over a small building that measures 20 by 10 by 10 feet. On each square inch of the building, there is 2 pounds of pressure from the inside that is not balanced by air pressure outside the building. On the ceiling, that adds up to an unbalanced pressure of 57,600 pounds. The pressure on the four walls adds up to 172,800 pounds.
If windows are open in the building, some of the inside air will rush out through them. This will balance the pressure inside and outside the building. But if the windows are shut tightly, the great inside pressure may cause the building to burst.
　　Unfortunately, heavy rain happens in thunderstorms that later produce tornadoes. So, people often shut all windows to protect their property. This may cause far worse damage later.
63. Which of the following is the main topic of the passage?
A. Where tornadoes are formed. 　　      B. When tornadoes usually occur.
C. How tornadoes can be prevented.　　     D. Why tornadoes cause so much damage.
64. According to the passage, tornadoes can destroy building because the _____.
A. force of a tornado increases the air pressure in a building
B. air pressure at the center of a tornado is over 172,000 pounds
C. weight of a tornado can crush a building’s roof when it passes overhead
D. air pressure inside a tornado is less than the air pressure inside a building
65. According to the passage, the pressure on a building during a tornado can be reduced　　　　by _____.
A. closing the windows 　　　　　        B. opening the windows
C. using an electric fan 　　　　          D. making the roof and walls stronger
練習冊系列答案
相關(guān)習題

科目：高中英語 來源：不詳 題型：閱讀理解


If you are lost in the mountains, stay calm in the face of darkness, loneliness, and the unknown. It will greatly increase your chances of survival (生存). Many people think that preparing necessary equipment and knowing how to use it are very important, but actually eighty percent of mountain survival is your reaction to fear.
Find a hiding place.
Unnecessary labor will make you sweat and make you cold. Find a hiding place around you before trying to start your own construction. If you are in a snow-covered area, you may be able to dig a cave in deep snow for protection from the wind. You should try to hide yourself in the middle of the mountain if possible. Stay out of the valleys — cold air falls, and the valley floor can be the coldest area on the mountain.
Signal rescuers for help.
The best time to signal rescuers is during the day. Signal for help from the highest point possible — it will be easier for rescuers to see you, and any sound you make will travel farther. If you take a box of matches and a space blanket (a special blanket for traveling), build three smoky fires and put your blanket — gold side facing out — on the ground.
Do not walk away.
It will make finding you more difficult, as search teams will be trying to follow your path and may miss you if you have gone off in a different direction. Searchers often end up finding a car with no one in it.
If you get frostbite (凍傷), do not rewarm the affected area until you’re out of danger.
You can walk on frostbitten feet, but once you warm the area and can feel the pain, you will not want to walk anywhere. Try to protect the frostbitten area and keep it dry until you are rescued.
36. When lost in the mountains, you can increase your chances of survival if you      .
A. take a space blanket with you            B. do more physical labor
C. try to find a car immediately                    D. walk as far as possible to find help
37. According to the passage, people most probably fail to survive if they      .
A. do not take enough equipment           B. stay in the middle of the mountain
C. do not keep themselves warm            D. stay in a snow-covered area
38. What can we infer from the passage?
A. Don’t travel by yourself.                   B. Mountain traveling is dangerous.
C. Don’t get frightened in danger.          D. Avoid going to unfamiliar places.

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解


There are warm tropical regions all over the globe, but only the Indians of the South American rain forests have formed the habit of sleeping in the open air. Long before they made painful acquaintance (相識) with Europeans, they had invented something that was unique on earth: the hammock.
Nobody really knows who first had the bright idea of making sleeping in the air the symbol of untroubled rest. The Indians see the hammock as a “gift of heaven (上天)”, something given to them a very long time ago.
In it the Indians pass away hot noon hours, napping or chatting. Swinging it to and fro (來回擺動) creates a cooling breath of air and keeps away insects. They work and play in hammocks, are born and die there.
Hung like a suspension bridge between heaven and earth, a hammock is dry while the soil is damp and is safe from most wild animals.
Hammocks have the advantage over beds in that they are easy to transport and take up very little space when they have been rolled up(卷起) . Indians never go on a journey without their hammocks, not even to their plantations.
76.The word hammock in this passage means _______.
A. a suspension cage which can be swung to and fro in the air
B. a seat hanging by two ropes from the branch of a tree
C. a suspension bridge in the South American rain forests.
D. a net hung between two supports and used as a bed.
77. When was the hammock invented and by whom?
A. The Indians had invented the hammock long before they came to South America.
B. The Indians had invented the hammock long before the Europeans came to South America.
C. The Europeans invented the hammock after they made acquaintance with the Indians.
D. The Europeans had invented the hammock before they went to South America.
78. Indians swing the hammock to_______.
A. pray to heaven for a gift       B. keep away flies, mosquitoes and other insects
C. keep away wild animals        D. all asleep quickly
79. According to the passage, hammocks _______.
A. cannot be rolled up                B. are difficult to transport
C. are never brought to the plantations   D. can be kept dry while the ground is wet
80. The passage is about _______.
A. the Indian way of living                      B. tropical regions
C. Indians' gift for the Europeans           D. a portable bed

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解


Grown-ups know that people and objects are solid. At the movies, we know that if we reach out to touch Tom Cruise, all we will feel is air. But does a baby have this understanding?
To see whether babies know objects are solid, T. Bower designed a method for projecting an optical illusion（視覺影像）of a hanging ball. His plan was to first give babies a real ball, one they could reach out and touch, and then to show them the illusion. If they knew that objects are solid and they reached out for the illusion and found empty air, they could be expected to show surprise in their faces and movements. All the 16-to 24- week -old babies tested were surprised when they reached for the illusion and found that the ball was not there.
Grown-ups also have a sense of object permanence. We know that if we put a box in a room and lock the door, the box will still be there when we come back. But does a baby realize that a ball that rolls under a chair does not disappear and go to never-never land?
Experiments done by Bower suggest that babies develop a sense of object permanence when they are about 18 weeks old. In his experiments, Bower used a toy train that went behind a screen. When 16-week-old and 22-week-old babies watched the toy train disappear behind the left side of the screen, they looked to the right, expecting it to reappear. If the experimenter took the train off the table and lifted the screen, all the babies seemed surprised not to see the train. This seems to show that all the babies had a sense of object permanence. But the second part of the experiment showed that this was not really the case. The researcher substituted（替換）a ball for the train when it went behind the screen. The 22-week-old babies seemed surprised and looked back to the left side for the train. But the 16-week -old babies did not seem to notice the switch（更換）. Thus, the 16-week-old babies seemed to have a sense of “something permanence,” while the 22-week-old babies had a sense of object permanence related to a particular object.
68. The passage is mainly about _____.
A. babies’ sense of sight                 B. effects of experiments on babies
C. babies’ understanding of objects         D. different tests on babies’ feelings
69. In Paragraph 3, “object permanence” means that when out of sight, an object ________.
A. still exists    B. keeps its shape        C. still stays solid       D. is beyond reach
70. What did Bower use in his experiments?
A. A chair.        B. A screen.      C. A film.         D. A box.
71. Which of the following statements is true?
A. The babies didn’t have a sense of direction.
B. The older babies preferred toy trains to balls.
C. The younger babies liked looking for missing objects.
D. The babies couldn’t tell a ball from its optical illusion.

查看答案和解析>>

科目：高中英語 來源：不詳 題型：完形填空

完型填空（共20小題；每小題1.5分，滿分30分）
閱讀下面短文，掌握其大意，然后從36—55各題所給的四個選項（A、B、C和D）中，選出最佳選項，并在答題卡上將該項涂黑。
Fifteen years spent in the field of education has provided me with many treasured moments. One of the most unforgettable   36  when I was teaching second grade 10 years ago.
In May I decided to plan something special for the children; a Mother’s Day tea. We had put our   37  together to come up with ideas of how to   38  our mothers. We practiced singing songs, memorized poems and wrote cards. We decided to hold our tea the Friday before Mother’s Day. I was surprised and   39  to learn that every mother was planning to attend. I   40  invited my own mother.
Finally, the big day arrived. Each child lined up at our classroom door,   41 the arrival of his or her mom.   42  it got closer to starting time, I looked around and my eyes quickly found Jimmy. His mother hadn’t   43  up and he was looking upset.
I took my mother   44  the hand and walked over to Jimmy. “Jimmy,” I said, “I have a bit of problem here and I was   45  if you could keep my mother   46  while I’m busy.”
My mom and Jimmy sat at a table. Jimmy   47  my mom her treats, presented her with the gift I had made, just as we had   48  the day before. Whenever I looked over, my mother and Jimmy were in deep   49 .
Last year, I took a senior class on a field trip, and there was Jimmy, I had the students complete an outline of the day’s   50  and an evaluation of our trip. Then I collected the students’ booklets and checked them to see if   51  was completed. When I came to Jimmy’s   52 , he had written “Remember our Mother’s Day tea we had in second grade, Mrs, Marra? I do! Thanks for all you did for me, and thank your mother, too.”
I told him I really enjoyed what he had written. He looked rather embarrassed and   53   his own thanks and walked away. Suddenly he ran bark and gave me a big hug.
“Thanks again. No one even knew my mother didn’t   54  it.”
I ended my workday with a hug from a teenage boy who    55  stopped hugging teachers years ago.
36．A．lasted                  B．happened             C．experienced         D．described
37．A．heads                  B．brains                 C．minds                 D．hearts
38．A．love                    B．please                 C．respect                D．a(chǎn)dmire
39．A．a(chǎn)stonished           B．worried               C．relieved               D．interested
40．A．even                   B．ever                    C．still                     D． once
41．A．expecting            B．hoping                C．predicting            D．supposing
42．A．Although            B．As                      C．While                 D．Because
43．A．set up                 B．picked up            C．turned up            D．held up
44．A．over                   B．to                       C．on                      D．by
45．A．considering         B．wondering           C．a(chǎn)sking                 D．doubting
46．A．connection          B．safety                  C．company             D．concern
47．A．served                 B．supplied              C．a(chǎn)ssigned              D．a(chǎn)pplied
48．A．taught                 B．studied                C．practiced             D．told
49．A．mood                  B．thought               C．a(chǎn)greement           D．conversation
50．A．feeling                B．behavior              C．events                 D．performances
51．A．something           B．everything           C．a(chǎn)nything              D．nothing
52．A．page                   B．help                    C．side                    D．turn
53．A．a(chǎn)nnounced           B．delivered             C．stated                  D．whispered
54．A．make                  B．get                      C．do                      D．take
55．A．probably             B．exactly                C．rarely                  D．fairly

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

Children who speak English as their first language are now a minority in inner-city London primary schools，official figures show.
Youngsters with foreign mother tongues form a majority at primary schools in 13 out of33 London cities. Across the country，English is a foreign language to more than one in seven primary school youngsters.
The figures from the Department for Children，Schools and Families (DCSF) point to major demographic (人口的) changes over the past few decades，with around a fifth of pupils now coming from ethnic minorities.
There are concerns that school finances are coming under stress from the growing numbers of youngsters requiring help with English. The government has been urged to provide more funding，and give fair treatment to schools with large concentrations of non-English speakers.
In Tower Hamlets almost four out of five youngsters do not have English as their mother tongue. In other areas，including Leicester，Luton and Bradford the proportion approaches 50 percent.
The figures indicate that many recent migrants have settled in London. Sir Andrew Green，F(xiàn)ounder and Chairman of Migration Watch UK，says，“These figures confirm the huge impact immigration is having on our society. When government funds are as tight as they are，this is bound to have a negative impact，since children for whom English is a second language need extra tuition (學費).”He adds，“In inner London it's hard to know with whom immigrant chil­dren are supposed to practice English，since the number of immigrant children is much larger than that of local. ”
A spokesman for DCSF stresses that the figures “only indicate the language to which a child was initially exposed at home，regardless of whether he or she comes to speak English fluently later on. It is only a relatively few recent arrivals for whom communication problems are serious”.“We are increasing funding to the Ethnic Minority Achievement Grant (助學金)to £206 million by 2010，to help bring students weak in English up to speed. We’re also equipping schools to offer effective English as an Additional Language teaching to new arrivals，”he adds
72.A minority of London primary school students speak English as their first language because
      .
A. local children prefer to speak other languages
B. more and more immigrant children are attending school in London
C. children learning English as an additional language need extra tuition
D. English is too difficult a language for primary school children to learn
73.Some people worry about      .
A. the increasing number of adults needing help with English
B. the government taking no measures to help the schools
C. non-English speakers putting school finances under stress
D. London schools not providing adequate service for children in need
74.It can be inferred from the passage that         .
A. most immigrant children make a great effort to learn English
B. the government used to treat non-English speakers unfairly
C. it's not easy to find English speakers for immigrant children in some parts of London to communicate with
D. local children are influenced by immigrant children
75.According to the spokesman for DCSF，the figures indi­cate       .
A. that children will speak English fluently later on
B. that immigration is having a huge impact on English society
C. what the language the children were exposed to first was
D. that funding is increasing to help students weak in English

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

   The sea has always interested man. From it he can get food, minerals, and treasure. For thousands of years, he could sail on it. But he could not go far beneath its surface.
Man wants to explore deep into the sea. However, he is not a fish. He must breathe air, so he can’t stay under the water’s surface for any length of time. To explore deep water, man faces even more dangers and problems.
A diver who wants to stay under water for more than a few minutes must breathe air or a special mixture of gases. He can wear a diving suit and have air pumped to him from above. He can carry a tank of air on his back and breathe through a hose(軟管) and a mouthpiece. Water weighs 800 times as much as air. Tons of water pushes against a diver deep in the sea. His body is under great pressure.
When a diver is under great pressure, his blood takes in some of the gases he breathes. As he rises to surface, the water pressure becomes less. If the diver rises too quickly, the gases in his blood form bubbles(氣泡). The diver is then suffering from the bends(潛函病). The bends can cause a diver to double up in pain. They can even kill him.
60. On the whole, this text is about _________.
A. special mixtures of gases in deep sea.
B. the problems a diver faces in deep sea.
C. air pressure under the surface of sea water.
D. a kind of illness that man suffers in the sea.
61. The text does not say so, but it makes you think that ____________.
A. deep-sea divers should be in good health.
B. divers explore the deep sea only for treasure.
C. there is a special mixture of gases under the sea.
D. diving under the water too quickly causes a kind of illness.
62. Why does a diver get the bends?
A. The air in his blood is used up.
B. His diving suit weighs too much.
C. He comes to the surface too quickly.
D. He tries to do exercise under the sea.
63. From the text we can learn that _____________.
A. man cannot stay under water for more than a few minutes.
B. the sea began to interest man in the last few years.
C. all divers will get the bends sooner or later.
D. the bends may kill a diver.

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

    
D
Although women lead healthier, longer lives, the cruel perception that they reach their sell-by date and become “old” sooner than men is widespread in the workplace, research shows.
A survey of more than 2,600 managers and personnel professionals showed that age discrimination is not only common in the workplace, but is full of inconsistencies(矛盾). Six in ten managers thought that they had suffered from age discrimination——usually because they were turned down for a job for being too old or too young. Yet more than a fifth admitted that they used age as a condition when they employ new workers.
Although the survey found widespread agreement that older workers were better than younger colleagues when it came to reliability, commitment, loyalty and customer service, these qualities were not necessarily considered to be worthy of advancement. More than half of respondents believed that workers between 30 and 39 were the most likely to be advanced in their company, with only 2 per cent citing (引證)50-year-olds or above.
Dianah Worman of the Chartered Institute of Personnel and Development said that there was anecdotal evidence that people were considered old at different ages in different sectors. “We heard of one man working in IT who said he was considered too old by the age of 28,”she said.“There was no evidence to suggest that older workers were less valuable to companies than younger workers, in fact the opposite was often true because older workers often brought experience.” she added.
The findings also suggested that the Government’s ideas on age in the workforce may also be out of step with reality.
68. The text is mainly about ______.
A. the government’s idea on age in workforce 
B. age discrimination in the workforce
C. the people who find work            
D. the discussion about who is worth promoting
69. The underlined word “sell-by date” in paragraph 1 probably refers to______.
A. the age when they retire   
B. the age when they should be promoted
C. the date on which they’re sold 
D. the date when they sell goods
70. The writer’s purpose in writing the text is to ______.
A. tell the government to employ older workers 
B. criticize managers who treat workers unfairly
C. report the findings of a survey    
D. show he objects to age discrimination

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解


C
A new age is coming. Call it what you will: the service economy, the information age, the knowledge society. It all translates to a fundamental change in the way we work. Already we’re partly there, the percentage of people who earn their living by making things has fallen dramatically in the Western World. Today the majority of jobs in America, Europe and Japan are in the service industry, and the number is on the rise. More women are in the work force than ever before. There are more part-time jobs. More people are self-employed. But the range of the economic transformation can’t be measured by numbers alone, because it also is giving rise to important new way of thinking about the nature of work itself. Long-held ideas about jobs and careers, the skills needed to succeed, even the relation between individuals and employers — all these are being challenged.
We have only to look behind us to get some sense of what may lie ahead. No one looking ahead 20 years possibly could have foreseen the ways in which a single invention, the chip, would transform our world thanks to its applications in personal computers, digital communications and factory robots. Tomorrow’s achievements in biotechnology, artificial intelligence or even some still unimagined technology could produce a similar wave of dramatic changes. But one thing is certain: information and knowledge will become even more valid, and the people who possess it, whether they work in manufacturing or services, will have the advantage and produce the wealth. Computer knowledge will become as basic a requirement as the ability to read and write. The ability to solve problems by applying information instead of performing routine tasks will be valued above all else. If you cast your mind ahead 10 years, information service will be superior. It will be the way you do your job.
66. A characteristic of the new age mentioned in the passage is that        .
A. the service industry mainly relies on females
B. manufacturing industries are steadily increasing
C. more people are in the service industry than before
D. the work in the service industry is more comfortable than that in manufacturing industry
67. Which of the following is true according to the passage?
A. People’s traditional concepts about jobs need changing.
B. The relation between employees and employers is becoming tense.
C. More women than men are in the work force.
D. Part-time jobs are more welcome than full-time jobs.
68. By mentioning the invention of “the chip”, the author means to say that       .
A. we haven’t paid enough attention to the importance of high technology
B. the chip is the most important invention today
C. the power of science and technology is beyond our imagination
D. it’s a great challenge to apply new inventions to our life
69. We may draw a conclusion from the passage that        .
A. information will play a greater role in people’s work and daily life in the future
B. we can foresee the future if technology develops fast enough
C. the ability of performing routine tasks gives you an advantage in work
D. robots will replace people to do all the work both in manufacturing and service industries
70. The author’s attitude to the coming age is        .
A. doubtful         B. enthusiastic           C. satisfied        D. Uncertain

查看答案和解析>>

同步練習冊答案