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【单选题】
In many parts of the United States when Wal-Mart opens a new store, some smaller retailers go out of business. One of the reasons for this development could be that:A.
Wal-Mart practices unfair pricing methods that reduce consumer surplus over time.
B.
consumers in those areas receive no consumer surplus from Wal-Mart.
C.
consumers in those areas receive a larger consumer surplus from shopping at Wal-Mart than from the smaller stores.
D.
smaller stores increase prices to compete.
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皮皮学刷刷变学霸
举一反三
【单选题】法洛四联症的X线检查最具有特征性表现为
A.
肺血管影减少
B.
心影大小正常，呈”靴形”
C.
主动脉弓可能位于右侧
D.
升主动脉通常扩大
E.
侧支循环的肺野为网状影
【简答题】朋友,我很抱歉不能陪你去聚会了。