单选题According to the passage,we can see that lower prices and better quality occur______.Aas a result of the effect of one on the otherBalways at the same timeCindependently of each otherDwhen the demand exceeds the supply
单选题
According to the passage,we can see that lower prices and better quality occur______.
A
as a result of the effect of one on the other
B
always at the same time
C
independently of each other
D
when the demand exceeds the supply
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解析：
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