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【单选题】
完全竞争和垄断竞争之间的一个区别是( )A.
完全竞争的行业拥有的公司较少。
B.
在完全竞争中，公司生产略有差异化的产品。
C.
垄断竞争有进入壁垒。
D.
垄断竞争中的企业面临着向下倾斜的需求曲线。
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【单选题】—How many computers are there in the room? —________．Some workers moved them to another place just now．
A.
None
B.
Both
C.
Nobody
D.
Neither
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