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 public 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 本题实际上是问第三段的中心思想，因此解题时只需要找出全段最核心的句子即可。该段除前两句外，其他均为例子。对两句进行比较，可判断第一句为核心句，第二句为支持性话语。对第三段段首句进行压缩改写，可得出答案为B)。
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本试题收录于： 浙江省大学英语三级题库大学英语三级分类
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