选择题:Which of the following is the author‘s view on the

题目内容:
Which of the following is the author‘s view on the historical development of toys?
A) The craftsmanship in toy-making has remained essentially unchanged.
B) Toys have remained basically the same all through the centuries.
C) The toy industry has witnessed great leaps in technology in recent years.
D) Toys are playing an increasingly important role in shaping a child‘s character.
参考答案:

当政府试图处理负的外部性时,它的基本目标是( ):A. 消除社会成本B. 激励决策者考虑全部成本

当政府试图处理负的外部性时,它的基本目标是( ):A. 消除社会成本B. 激励决策者考虑全部成本C. 消除引起外部性的行为D. 减少社会成本使之等于私人成本

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