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。()
查看答案
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
The price of been_____from 50 cents to $4 per liter during the summer season.
A. flowed
B. ranged
C. separated
D. differed