2. 外语
  3. •Read the article below about the central problem of Economics. •Choose the best word to fill each gap, from A, B, C or D. •For

•Read the article below about the central problem of Economics. •Choose the best word to fill each gap, from A, B, C or D. •For

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问题 •Read the article below about the central problem of Economics.
•Choose the best word to fill each gap, from A, B, C or D.
•For each question 19—33,mark one letter (A, B, C or D) on your Answer Sheet.
•There is an example at the beginning.
                                   The Central Problem of Economics
     The central problem of economics is to satisfy the people’s and nation’s wants.
     The problem we are faced with is that our resources, here identified as money, are limited.  The only way we can resolve our problem is to make choices. After looking at our resources, we must examine our list of  (19)  and identify the things we need immediately, those we can postpone, and  (20)  we cannot afford. As individuals, we face the central problem involved in economics  deciding just how to allocate (分配) our limited resources to provide  (21)  with the greatest satisfaction of our wants. Nations face the same problem. As a country’s population grows the need for more goods and services grows correspondingly. Resources necessary to production may increase, but there  (22)  are enough re sources to satisfy the total desires of a nation. Whether the budget meeting is taking place in the family  (23)  room, in the conference room of the corporation  (24)  of directors, or in the chamber of the House of Representatives in Washington, the basic problem still exists. We need to find methods of allocating limited resources in order to satisfy unlimited wants.
     A short time ago economists  (25)  goods into two categories, free and economic. The former, like air and water, were in  (26)  abundance that economists had no concern for them. After all, economics is the  (27)  of scarcity (匮乏) and what to do about it. Today many of these "free goods" are  (28)  very expensive to use. Pollution has made clean air and water expensive for producers who have to filter their waste products, for consumers who ultimately (最终)  (29)  the producers’ extra costs, and  (30)  taxpayers who pay for the government’s involvement in cleaning the environment.
In the 1990s, almost all goods are  (31)  Only by effort and money can they be obtained in the form people wish.
      Meeting the needs of people and froming resources available  (32)  the basic activity of production. In trying to meet  (33)  wants from limited economic goods, production leads to new problems in economics.  
选项 A、are led to
B、leads
C、lead to
D、leads to
答案D
解析 lead to：导致。作‘导致’解时，lead to不能用被动语态，所以A是错误选择；C是错误的，因为句子的主语是第三人称单数，动词要与之在语法上相呼应。
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