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  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
From the passage we learn that the purpose of collecting taxes is to______.
选项 A、ensure the continuous supply of public goods
B、reduce the difference between the rich and the poor
C、get extra money to support public goods
D、remind people of their duty
答案A
解析 文章最后一段大意为：我们不可能让每个人都直接为公共产品付账，因此，我们就以收税来保证公共产品的供给。从中可以看出答案应为A)。B)、D)两项不包含主题词，因此为干扰项。C)具有较强干扰性，需特别留心，但是选项中的extra是一种隐含的比较，而原文未作任何比较，因此也是干扰项。
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