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
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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.
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
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