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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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.

单项选择题

In the specific recession years noted in the passage, it can be inferred that______.

A．the rate of unemployment grew
B．the rate of employment rose
C．labor force growth exceeded final expenditure for goods
D．full employment was attained