Directions: For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in each blank with the word or phrase that best fits the context.
The central problem of economics is to satisfy the people's and nation's wants.
The problem we faced with is that our resources, here identified as money are __50__. The only way we can solve the problem is to make choices. After looking at our resources, we must examine our list of __51__ and identify the things we need immediately, those we can postpone, and __52__ we cannot afford. As individuals, we face the central problem involved in economics---deciding how to allocate(分配) our limited resources to provide __53__ with greatest satisfaction of our wants.
Nations face the same problem. As a country's population __54__, the need for more goods and services grows correspondingly. Resources necessary to production may increase, but there are __55__ enough resources to satisfy the total desires of a nation. Whether the budget meeting is taking place in the family living room, in the conference room of the corporation __56__ of directors, or in the chamber of the House of Representatives in Washington, the basic problem still exists. We need to find __57__ of allocating（分配） limited resources in order to satisfy unlimited wants.
A short time ago, economists divided goods into two categories, free and economic. The former, like air and water, were in __58__ abundance(丰富) that economists had___59____ them. After all, economics is the __60__ of scarcity and what to do about it. Today many of these "free goods" are __61_ very expensive to use. Population has made clean air and water expensive for producers extra cost, and __62__ taxpayers who pay for the government's involvement in cleaning the environment.
In the 1990s, almost all goods are __63__. Only by effort and money can they be obtained .
Meeting needs of people and the demands from resource available __64__ the basic activity of production. In trying to meet unlimited wants from limited economic goods, production leads to new problems in economics.
50.A. limited B. unlimited C. scarcity D. abundant
51.A. want B. problem C. wants D. resources
52.A. those B. some C. others D. many
53.A. them B. themselves C. ourselves D. ours
54.A. expand B. extends C. grows D. increase
55.A. always B. sometimes C. often D. never
56.A. management B. function C. board D. group
57.A. people B. economists C. way D. methods
58.A. so B. great C. such D. such an
59.A. much concern forB. no concern with C. no concern for D. much concern in
60.A. form B. study C. means D. source
61.A. possibly B. in practice C. in fact D. practically
62.A. from B. at C. for D. with
63.A. plentiful B. scarce C. abundant D. in full supply
64.A. are led to B. leading to C. lead to D. leads to
Directions: Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need.
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F. evidence G. volcanic H. chemicals I. created J. closely |
Since early times, people have been ___41___with the idea of life existing somewhere else besides earth. Until recently, scientists believe that life on other planets was just a hopeful dream. But now they are beginning to___42____places where life could form. In 1997, they saw ____43____of planets near other stars like the sun. But scientists now think that life could be even nearer in our own solar system. One place scientists are studying very closely is Europa, a moon of Jupiter. Space probes(探测器) have provided evidence that Europa has a large ocean under its surface. The probes have also made scientists think that under its surface Europa has a rocky core（核心） giving off____44____heat. Water and heat from volcanic activity are two basic conditions needed for life to form. A third is certain basic____45____such as carbon, oxygen and nitrogen. Scientists believe there might be such chemicals lying at the bottom of Europa’s ocean. They may have already____46____life or may be about to. You may wonder if light is also needed for life to form. Until____47____, scientists thought that light was essential. But now, places have been found on earth that are in total blackness such as caves several miles beneath the surface. And bacteria,___48____ forms of life, have been seen there. So the lack of light in Europa’s sub-surface ocean doesn’t automatically rule out life____49____.
It is obvious that on no account _____ to the teacher that he has done the homework on his own.
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A．this is the first time he is lying |
B．this is the first time he has lied |
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C．is this the first time has he lied |
D．is this the first time he has lied |
According to the law, it is _____ get your driving license.
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A．not until you’re eighteen can you |
B．until you’re eighteen that you can’t |
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C．not until you’re eighteen that you can |
D．until you’re eighteen when you can’t |
As we all know, he has regretted wasting the precious time______ he should have studied hard
playing computer games at school.
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A．where |
B．that |
C．on which |
D．when |
Schools across China are expected to hire 50,000 college graduates this year as short-term
teachers, almost three times the number hired last year, _____reduce unemployment pressures.
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A．help |
B．to have helped |
C．to help |
D．having helped |
