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
If a government chooses to allocate more of its resources to its military forces, there is a possibility of reduction in resources allocated for________.
A．libraries and education
B．libraries and business firms
C．education and business firms
D．libraries, business firms and education
单项选择题
According to the passage, choices must be made because________.
A．resources are abundant
B．there is too much for us to do
C．there are only 24 waking hours in a day
D．our means are limited, but our wants are unlimited
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