单项选择题

What is most probably the key point discussed immediately before this passage

A．Limited time.
B．Making choices.
C．Opportunity cost.
D．The shortage of resources.
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单项选择题
According to the passage, economists define opportunity cost as ________ .
A．an opportunity given up in terms of cash
B．the cost of a better choice measured in terms of cash
C．giving up a specific choice for the next best alternative
D．the cost of a specific choice measured in terms of any alternative choice
单项选择题
In the example cited in the passage, the opportunity cost of studying for 4 hours per day was________.
A．4 hours of watching TV
B．4 hours of classes
C．4 hours of sleep
D．8 hours of sleep
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