单项选择题
The real dream of Ellie is .
A.Go to the Paradise Falls
B.Stay together with Carl
The real dream of Ellie is .
A.Go to the Paradise Falls
B.Stay together with Carl
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单项选择题
The long-term average cost of manufacturers is U-shaped because ( )
The long-term average cost of manufacturers is U-shaped because ( )
A.External economic issues
B.External diseconomies
C.Economies of scale and diseconomies of scale
D.The problem of marginal income