单项选择题

According to the passage, lack of technological progress in the ancient and medieval worlds was primarily due to the absence of______.

A．natural resources.
B．inventive ability.
C．people's desire for the" better things of life".
D．proper social organization.

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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.

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.

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