单项选择题

During the Renaissance, graphs and diagrams ______.

A．were often used to aid scientific researches
B．served as sources of fresh ideas for some scientists
C．could provide scientists with an immense quantity of knowledge
D．were necessary for the expression of creative ideas
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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
单项选择题
According to the passage, the rate of employment can be expected to rise when ______.
A．productivity rises at the same rate as growth of the labor force
B．productivity and labor force increase at a greater rate than output
C．output exceeds productivity
D．rate of economic growth is less than the number of man hours required
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