单项选择题

当某种牛活必需品的市场价格上涨幅度过大时，为保障大多数消费者的基本牛活稳定，政府采取最高限价进行干预，可能导致的结果足（)。

A.供给短缺
B.政府储备增加
C.供给过多
D.生产成本上升
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听力原文：W: Harry, It's polite to call friends before a visit, isn't it?M: You are absolutely right with that! People in the West usually don't like surprise visits. But close friends often drop in on each other whenever they feel likE.That's another story!Q: What does the man mean?(14)A.Surprise visits are acceptable among close friends.B.Surprise visits are not welcome even among close friends.C.People expect even their close friends to call them before their visits.D.Dropping in on your friends is considered good manners.
A.Surprise
B.
B.Surprise
C.
C.People
D.
D.Dropping
E.
单项选择题
判某企业的产量为2个单位时，其总成本、总固定成本、总可变成本、平均成本分别是2000元、1200元、800元和1000兀；当产量为3个单位时，其总成本、总固定成本、总可变成本、平均成本分別是2100元、1200元、900元和700元，则该企业的边际成本是（）元。
A.0
B.150
C.100
D.300
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