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
【正确答案】
B
【答案解析】
原文中划线句子中的in the meanwhile可以作为证据
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