单项选择题

郑和在28年的时间里（）次下西洋？
A、5
B、6
C、7
D、8

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2004年4月27日，胡锦涛在会见中央实施（）理论研究和建设工程工作会议全体代表时指出：该工程是加强党的理论建设的重大举措。

A、马克思主义
B、毛泽东思想
C、邓小平理论
D、科学发展观

单项选择题

Just north of the town of Muskrat, Ontario, in Problem 35.1, is the town of Brass Monkey, population 8,000. Brass Monkey, like Muskrat, has a single public good, the town skating rink and a single private good, Labatts ale. Everyone's utility function is Ui(Xi,Y ) = Xi-81/Y; where Xi is the number of bottles of ale consumed by i and Y is the size of the skating rink in square meters. The price of ale is 5 per square meter. Everyone has an income of at least $5,000. What is the Pareto efficient size for the town skating rink? A. 360 square meters B. 480 square meters C. 240 square meters D. 725 square meters