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【单选题】
拐折需求曲线模型(齐模型)是( )。A.
定一个厂商提高价格，其他厂商就一定跟着提高价格
B.
说明为什么每个厂商要保持现有价格，而不管别的厂商如何行动
C.
说明为什么均衡价格是刚性的(即厂商不肯轻易变动价格)，而不是说明价格如何决定
D.
假定每个厂商认为其需求曲线在价格下降时比上升时更有弹性
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【简答题】Four students answered the teacher’s questions s______.
【单选题】Questions 37-40 Which FOUR of the following statements about termite mounds are true? Write the appropriate letters on your answer sheet in any order.
A.
Most mounds are miler than a human.
B.
A species of termite builds a mound for only one reason.
C.
Mounds are constructed from many different materials.
D.
Mounds with rounded tops are useful in wet climates.
E.
Termites that build magnetic mounds can detect magnetism.
F.
The temperature in a magnetic mound is fairly constant.
G.
Very little of a magnetic mound faces the sun during the middle of the day.
H.
Termites live in the east and west sides of mounds at different times of day.