单项选择题

What is the main idea of the third paragraph

A．Geniuses make creations or discoveries in large quantities.
B．Geniuses can make many achievements without much effort.
C．Geniuses inevitably experience failures before making a success.
D．Geniuses may just produce something common and ordinary.

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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

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