大学英语四级考试15选10专项训练(四)

遇见明天

Unit Sixteen

Passage 2

  If you are looking forinformation, library shelves are a good place to start. But if you needup-to-the-minute data or have specialized needs, you may find a computerizeddatabase more useful, less expensive, and less time 11 .A database, afile of information on one subject or family of subjects, can be stored and 12 in a computer's memory. The speedof the computer then 13 you to recall any item in this file almost 14

  The three main types of databasesare statistical, bibliographic, and full text. Statistical databases store 15amounts of numerical data, such as wage and price indexes, censusinformation, foreign 16 rates and bond prices. Bibliographic databasesstore references to and summaries of articles in periodicals and newspapers.Full-text databases offer the complex texts of such 17 as newspaper,magazine, and journal articles.

Thousands of databases exist today, and their numbers are growing.      

  Many companies have their in-housedatabase, which is 18 to employees through computer terminals ormicrocomputers. In addition, several hundred commercial databases are nowavailable to the 19 , with literally millions of items of informationreadily obtainable.

These databases 20specific fields, such as law and financial forecasting, or general information,such as sports and weather data.

A. exchange   B. public     C.    instantly D. cover

E. enables  F.  consuming G. remained    H. materials

I. hide    J.  intensively  K. vast   L.  communications

M. exhausting N. accessible  0.  maintained      

Unit Seventeen

Passage 2

  No one knows exactly how manydisabled people there are in the world, but 11 suggest the figure isover 450 million. The number of disabled people in

India 12 isprobably more than double the total population of Canada.

In the United Kingdom,about one in ten people have some disability. Disability is not just somethingthat happens to other people: as we get older, many of us will become less 13, hard of hearing or have failing eyesight.

  Disablement can take many formsand occur at any time of life. Some people are born with disabilities. Manyothers become disabled as they get older. There are many 14 disablingdiseases. The longer time goes on, the worse they become. Some people aredisabled in accidents. Many others may have a period of disability in the formof a mental illness. All are affected by people's attitude towards them.

  Disabled people face many 15barriers. Next time you go shopping or to work or to visit friends, imagine howyou would 16 if you could not get up steps, or on to buses and trains.How would you cope if you could not see where you were going or could not hearthe traffic? But there are other barriers; 17 can be even harder tobreak down and ignorance 18 represents by far the greatest barrier ofall. It is almost impossible for the able-bodied to fully appreciate what theseverely disabled go through, so it is important to 19 attention tothese barriers and show that it is the individual person and their ability, nottheir disability, which 20

A. inevitably    B. evaluations C. estimates   D. manage

E. alone F.  counts   G. prejudice    H. physical

I. mobile J.  indifferently     K. withdraw     L.  progressive

M. regular   N. accounts    O. draw      

Unit Eighteen

Passage 2

  Social customs and ways ofbehaving change. Things which were considered impolite many years ago are now 11  . Just a few years ago, it was 12impolite behavior for a man to smoke on the street. No man who thought ofhimself as being a gentleman would make a 13 of himself by smoking whena lady was in a room.

  Customs also differ from countryto country. Does a man walk on the left or the right of a woman in yourcountry? Or doesn't it 14 ? What about table manners? Should you useboth hands when you are eating? Should you leave one in your lap, or on thetable?

  The Americans and the British notonly speak the same language but also 15 a large number of social customs. Forexample, in both America andEnglandpeople shake hands when they meet each other for the first time. Also, mostEnglishmen will open a door for a woman or offer their seat to a woman, and sowill most Americans. 16 is important both in Englandand in America.That is, if a dinner invitation is for 7 o'clock, the dinner guest eitherarrives 17 to that time or calls up to explain his 18

  The important thing to rememberabout social customs is not to do anything that might make other people feeluncomfortable— 19 if they are your guests. There is an old story about aman who gave a formal dinner party. When the food was served, one of the guestsstarted to eat his peas with a knife. The other guests were amused or shocked,but the 20 calmly picked up his knife and began eating in the same way.

A. especially   B. attainable   C. close D. delay

E. considered F.  host   G. delivery  H. Preparation

I. share  J.  fool    K. specifically L.  acceptable

M. matter    N. Promptness    O. care       

Unit Nineteen

Passage 2

  The economy of the United Statesafter 1952 was the economy of a well-fed, almost fully employed people. Despite11 alarms, the country escaped any postwar depression and lived in a 12of boom. An economic survey of the year 1955, a typical year of the 1950's, maybe typical as 13 the rapid economic growth of the decade. The nationaloutput was 14 at 10 percent above that of 1954(1955 output was estimatedat 392 billion dollars). The production of manufactures was about 40 percentmore than it had 15 inthe years immediately following World War I . The country's business spentabout 30 billion dollars for new factories and machinery.     

  National income 16 forspending was almost a third greater than it had been in 1950. Consumers spentabout 256 billion dollars; that is about 700 million dollars a day, or abouttwenty-five million dollars every hour, all round the 17 . Sixty-fivemillion people held jobs and only a little more than two million wanted jobsbut could not find them. Only agriculture 18 that it was not sharing inthe boom. To some observers this was a sad reflection of the mid-1920's. Asfarmers' share of their products 19 , marketing costs rose. But therewere, among the observers of the national economy, a few who were not asconfident as the majority.

  Those few seemed to fear that theboom could not last long and would 20 lead to the opposite—depression.

A. eventually   B. averaged    C. gradually    D. state

E.valued    F.  form  G. declined     H. occasional

I. casual J.  argued   K. descended L.  complained

M. clock N. available    O. illustrating       

Unit Twenty

Passage 2

  Growth of trade will dependgreatly on availability of energy sources. There may still be a trillionbarrels of recoverable oil in the Middle East.     

  But the oil crisis of 1974 has11 to renewed interest in coal and to a search for 12 sources ofenergy. Solar, geothermal, and nuclear energy will play a large role in theyears to come.

  Solar energy is available in 13forms. Buildings can be heated and cooled by direct use of solar radiation,crops and trees, which are the most efficient converters of sunlight intoenergy, can be grown for their energy potential, wastes can be burned as 14, sunlight can be converted into DC (direct current) electricity, electricpower can be 15 from the sun-warmed surface waters of the ocean, andlastly, solar radiation can be converted into heat that will drive electricpower generators. Serious problems still remain as to 16 and storage ofsolar energy.

  Geothermal energy is the energycontained within the earth. Heat is abundantly available deep in the earth'score and is constantly being produced. However, this heat is usually located attoo deep a level for      17 exploitation.In short, very little is known on the use of geothermal energy, and it has 18been exploited.

  Nuclear energy is produced innuclear power plants. At these plants atoms of uranium are split, thus 19masses of energy. Another source of energy under development is the nuclearfusion of certain atoms of hydrogen. This could eventually 20 naturalgas as a source of energy.

A. rarely B. transformation C. fuel    D. replace

E. led     F.  alternative  G. commercial     H.    briefly

I. derived    J.  various  K. relieving L.  releasing

M. transportation N. financial O. described        

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