单选题 Which of the following statements best describes the organization of the first two paragraphs?

A、 Suggestions for the application of an economic concept are offered.
B、 Several generalizations are presented from which various conclusions are drawn.
C、 Persuasive language is used to argue against a popular idea.
D、 A general concept is defined and then examples are given.

【正确答案】 D

【答案解析】[考点] 本题为推理判断题。
[解析] 文章第一段给出了公共商品的概念，接着又列举了许多公共商品的实例。