选择题:A. What kind of job did you do? B: ( ).(本题3.5分) A、

题目内容:
A. What kind of job did you do?
B: ( ).(本题3.5分)
A、 worked at a bookstore on campus.
B、 Yes. I brewed coffee in the Student Union.
C、 But selling books was satisfying.
D、 I need to earn the money.
参考答案:

没有外部性时,生产者和消费者付出的私人边际成本之和也就是社会边际成本,生产者和消费者得到的私人边际收

没有外部性时,生产者和消费者付出的私人边际成本之和也就是社会边际成本,生产者和消费者得到的私人边际收益也就是社会边际利益。()A.错误B.正确

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