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题目材料：

To evaluate any given intellectual property policy, we must weigh the costs and benefits of awarding copyright protection. If an innovation and the benefits of the protection are nonexistent, then, by the cost-benefit criterion, it is unwarranted. Such a situation arose in 1998, when the United States Congress extended the term of copyright from 50 years after an author's death to 70. Book buyers are harmed by this. A book's price is higher under copyright because the publisher continues to owe royalties to the author's heirs and does not compete with others printing the same book. Against that drawback, there is no countervailing benefit. Authors are hardly likely to find motivation in the prospect of earnings that will arrive more than 50 years after their death. Moreover, the extension was applied retroactively to existing copyrights一but authors do not need incentives to write books they have already written.

The primary purpose of the passage is to

A.argue that intellectual property policies are often unwarranted
B.show how a particular criterion can be used to evaluate an intellectual property policy
C.summarize the costs and benefits of introducing intellectual property policies
D.approve the reasoning that was used to justify a particular intellectual property policy
E.challenge a claim that the benefits of intellectual property policies outweigh the costs

B显示答案

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以上解析由考满分老师提供。

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