单项选择题

The author uses the examples of horse and ox to argue that______.

A．humans should not maltreat animals.
B．man wasted a lot of resources in his exploitation of the enviroment.
C．there was no technical improvement areas of human efforts.
D．stagnation which prevailed for a long time was as sterile as it was inhuman.

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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.

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.