2. 外语
  3. It would be difficult to have a society like ours without public goods such as defense, transportation, and other services.

It would be difficult to have a society like ours without public goods such as defense, transportation, and other services.

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问题     It would be difficult to have a society like ours without public goods such as defense, transportation, and other services.
    A public good is one that a person can use without reducing the use of it for another person. One of the best examples of a pubic good is national defense. One person can benefit from our national defense without reducing another person’s benefits. In fact, it is difficult to keep any person in our society from enjoying the benefits of national defense.
    The market system does not work well in producing public goods. This is because a person who refuses to pay for a public good cannot be kept from using it. Suppose that the neighbors in a high crime area decide to hire a police force. Each neighbor, except Mrs. Smith, agrees to pay $100 a year for it. Mrs. Smith refuses to pay because she knows that if all the others pay the $100, the police will guard the area anyway. So Mrs. Smith can enjoy the services of the police force without paying $100.
    The market system has no way to deal with this type of problem. For this reason, we cannot ask each person to make a direct payment in the form of product price. Therefore, we collect money for public goods by using taxes.  
In the third paragraph the author explains ______.
选项 A、what role the market system plays in producing public goods
B、how weak the market system is in producing public goods
C、why some people refuse to pay for public goods
D、what we can do to make use of the market system
答案B
解析 根据题目要求定位到第三段。要回答这个问题需要分析清楚整段话的意思：第一句点明在公共服务运行的过程中不能使用市场体制；第二句给出了原因；接下来的几句话是举例进一步解释说明。所以很明显，第一句是该段的主题句，其他都是围绕这一主题而进行的解释。从而可以推断出作者是想说明市场体制不适合公共服务，B项的表述符合文意，为正确答案。
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