单项选择题

It can be inferred from the passage that a change in class relationship after the Middle Ages led to greater productivity because______.

A．freemen had incentives to produce more.
B．masters had greater incentive to make their workers harder.
C．slaves never starved, no matter what they produced.
D．productivity could go in only one direction.

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单项选择题

During the Middle Ages, productivity of labour______.

A．was a primary concern of society.
B．was hampered by class relationships.
C．went beyond levels reached by the Greeks.
D．both increased and decreased.

单项选择题

In supporting his argument about the ancient world, the author mainly discusses the______.

A．examples of the separation of mechanics and geometry.
B．cases about the studies of lack of communication between classes.
C．obstacle to the progress of technology.
D．his concern about the plight of the labouring classes.