The cost of living in Glasgow is among the lowest in Britajn,____the quality of life is probably one of the highest.
A. since
B. when
C. as
D. while
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在实现了配置效率的情况下,只有减少一个人的效用才能增加另一个人的效用。()
菲利普斯曲线适合解释短期失业率与通货膨胀之间的替代关系。()
It only takes a fraction of a second for the computer to do the____which used to take days.
A. conclusion
B. experiment
C. explanation
D. calculation