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单项选择题

An economy has five workers.Each worker can make 4cakes or 3shirts.What is the opportunity cost of making a shirt？（）.

A．0.75cakes
B．1.33cakes
C．4cakes
D．3cakes

单项选择题

As the wage rate per hour increases，the opportunity cost of leisure（）.

A．remains constant
B．decreases since the consumer now has more income to spend
C．increases since the cost of forgoing one hour of work increases
D．may increase or decrease depending on the individual’s preferences