There are various ways in which individual economic units can interact with

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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. [br] 【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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