2. 外语
  3. There are various ways in which individual economic units can interact with one another. Three basic ways may be described as th

There are various ways in which individual economic units can interact with one another. Three basic ways may be described as th

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问题     There are various ways in which individual economic units can interact with one another. Three basic ways may be described as the market system, the 【C1】______system, and the traditional system.
    In a market system individual economic units are【C2】______ to interact among each other in the marketplace. It is 【C3】______to buy commodities from other economic units or sell commodities to them. In a market,【C4】______ may take place 【C5】______barter or money exchange. In a barter economy,【C6】______goods such as automobiles, shoes, and pizzas are traded against each other. Obviously, finding somebody who wants to trade my old car in 【C7】______for a sailboat may not always be an easy task.【C8】______the introduction of money as a medium of exchange【C9】______ transactions considerably.
    An【C10】______ to the market system is administrative control by some 【C11】______ over all transactions. This agency will issue commands【C12】______ how much of each good and service should be produced, exchanged, and【C13】______ by each economics unit. Central planning may be one way of administering such an economy. The central plan, drawn 【C14】______by the government, shows the amounts of each commodity produced by the various firms and【C15】______ to different households for consumption. There is an example of complete planning of production, consumption, and exchange for the whole economy.
    In a traditional society, production and consumption【C16】______are governed by tradition; every person’s place within the economic system is fixed by parentage, religion, and custom. Transactions take 【C17】______ on the basis of tradition, too. People belonging to a certain group or caste may have an【C18】______to care for other persons, provide them with food and shelter, care for their health, and provide for their education. Clearly, in a system 【C19】______every decision is made on the basis of tradition alone, progress may be difficult to achieve. A【C20】______ society may result.
【C12】
选项 A、as though
B、as to
C、as usual
D、as with
答案B
解析 短语辨析题。[A]as though相当于连词，表示“仿佛，好像”；[B]as to相当于介词，表示“关于，至于”；[C]as usual相当于副词，表示“和平常一样”；[D]as with相当于介词，表示“和……一样”。分析原句可知，空格处应填入表示“关于”的介词，所以[B]as to是答案。
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