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 administered system, and the traditional system.
    In a market system individual economic units are free to interact among each other in the marketplace.  It is possible to buy commodities from other economic units or sell commodities to them. In a market,  transactions(交易) may take place via barter or money exchange. In a barter economy, real goods such as automobiles, shorts, and pizzas are traded against each other. Obviously, finding somebody who wants to trade my old car in exchange for a sailboat may not always be an easy task. Hence the introduction of money as a medium of exchange eases transactions considerably.
    An alternative to the market system is administrative control by some agency over all transactions. This agency will issue edicts(法令) or commands as to how much of each good and service should be produced, exchanged, and consumed by each economic unit. Central planning may be one way of administering  such an economy. The central plan, drawn up by the government, shows the amounts of each commodity produced by the various firms and allocated (分配) to different households for consumption.
    In a traditional society, production and consumption patterns are governed by tradition: every person’s place within the economic system is fixed by parentage(门第), religion, and custom. Transactions take place on the basis of tradition, too. People belonging to a certain group or caste may have an obligation  to care for other persons, provide them with food and shelter, care for their health and provide for their education. Clearly, in a system where every- decision is made on the basis of tradition alone, progress  may be difficult to achieve. A stagnant(停滞的，不景气的) society may result.
What is the main purpose of the passage?
选项 A、To outline contrasting types of economic systems.
B、To explain the science of economics.
C、To argue for the superiority of one economic system.
D、To compare barter and money-exchange markets.
答案A
解析 从全文来看我们知道，文章首先指出了三种经济制度，然后对三种经济制度逐一进行了简要的概括，所以正确答案为A；B．解释经济学；C．争辩一种经济制度的优越性；D．比较易货贸易和货币贸易市场，从全文看这三项显然不对。
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