According to the passage, public goods are______. The writer gives the example of national defense in paragraph 2 in order to s

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问题 According to the passage, public goods are______.
The writer gives the example of national defense in paragraph 2 in order to show that______.

选项 A、there will be no safety if there is no national defense
B、all the people should be responsible for national defense
C、a public good is a shared benefit for the whole society
D、some public goods are more important than others

答案C

解析 本题为例证题。此类型题常考例子所支撑的主旨,因此正确选项具有抽象性和概括性的特点。第二段开篇对公益下了定义,强调其共享性。国防是公益的一种形式,作者用它作例子说明这一特性,因此这一句是本段的主旨句,选项C与它最贴近。而A、B项是就事论事,D项对文章又过度延伸,因此是错误的。
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