问题
单项选择题
According to the passage, what are the opportunity costs of an item
A．The amount of time and money spent in producing it.
B．The opportunities a person has to buy it.
C．The value of what could have been produced instead.
D．The value of the resources used in its production.
答案
参考答案：C
解析：细节归纳题 第二段中“Every act of production uses up some of society's available resources；it means the foregoing of an opportunity to produce something else．”说明机会成本是用可生产的其他商品来衡量的，选项C正好符合该意思。
