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【单选题】
垄断竞争厂商所面对的需求曲线是A.
是下方倾斜的
B.
以上结论都正确
C.
是平行于横轴的直线
D.
是垂直于横轴的直线
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举一反三
【单选题】In the following two hours he was _____ the performance, because it turned out to be as wonderful as he had expected. [ ]
A.
tired of
B.
absorbed in
C.
annoyed with
D.
concerned about
【单选题】Which of the following is the consequence brought out by the introduction of Kodak?
A.
The number of professional photographers increased quickly.
B.
Family albums became out of date.
C.
Photography became much easier than ever before.
D.
Camera clubs and associations flourished.
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