MapReduce模式将任务自动分成多个子任务，通过Map和Reduce两步，实现任务在大规模计算节点中的调度与分配。
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[单选]One way in which monopolistic competition differs from oligopoly is that
A. there are no barriers to entry in oligopolies.
B. in oligopoly markets there are only a few sellers.
C. all firms in an oligopoly eventually earn zero economic profits.
D. strategic interactions between firms are rare in oligopolies.
[单选]A profit-maximizing firm in a monopolistically competitive market is characterized by which of the following?
A. marginal cost exceeds marginal revenue
B. average revenue equals marginal cost
C. price exceeds marginal cost
D. All of the above are correct.
[单选]In monopolistically competitive markets, positive economic profits
A. suggest that some existing firms will exit the market.
B. suggest that new firms will enter the market.
C. are sustained through government-imposed barriers to entry.
D. are never possible.
[单选]Under which of the following market structures would consumers likely pay the highest price for a product?
A. perfect competition
B. monopolistic competition
C. oligopoly
D. monopoly
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