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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单项选择题
We know little about the way in which workers' motivations are ________by the creation of a powerful market test.
A．lessened
B．affected
C．declined
D．effected
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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