单项选择题

在完全竞争市场中，（）

A.有许多买家和卖家
B.一个生产者出售的产品是另一生产者的完全替代品
C.能够自由进入与退出行业
D.以上都是

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单项选择题

M: I was told that your brother has gone to France.
W: No, he has gone to the U.S.A.
Q: Where is her brother now?（）

A.In France
B.In the USA
C.In Japan
D.In China

单项选择题

W: The shoes were a bargain. I got them for half price!
M: You mean you only paid $30 for them?
Q: How much did the shoes cost originally?（）

A．$30.
B．$60.
C．$13.
D．$16.