单项选择题

During the Middle Ages, productivity of labor ______.

A．was a primary concern of society
B．was hampered by class relationships
C．began to improve over levels reached by the Greeks
D．was in a period of technical progress
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单项选择题
We may infer that a change in class relationships after the close of the Middle Ages produced greater productivity because ______.
A．freemen had incentive to produce more
B．masters had greater incentive to work their workers harder
C．slaves never starved, no matter what they produced
D．productivity could go in only one direction
单项选择题
In supporting his contentions about the ancient world, the author relies mainly on illustrations drawn from ______.
A．examples of the separation of mechanics and geometry
B．case studies of lack of social communication between classes
C．technology
D．his concern with the plight of the laboring classes.
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