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问题 单项选择题

为什么党的十一届三中全会是中国社会主义事业发展的一个伟大转折点（）

A.中 * * 党面对” * * ”造成的危难局面，冲破”两个凡是”的思想束缚

B.重新确立实事求是的思想路线

C.作出把党和国家工作中心转移到经济建设上来，实行改革开放的历史性决策

D.以上全对

答案

参考答案：D

问答题

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单项选择题

Because copper producers are allowed to release harmful chemicals into the air, the industry supply curve is not the marginal social cost curve. Given this situation and a copper market that is otherwise competitive, copper producers will（）

A. produce less than the efficient amount of copper, an example of the "free rider" problem.

B. produce less than the efficient amount of copper, resulting in a dead weight loss from underproduction.

C. produce more than the efficient amount of copper, resulting in a deadweight loss from overproduction.
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