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

In order to understand a problem thoroughly, da Vinci ______.

A．referred to numerous books
B．made use of drawings and graphs
C．compared it with many other problems
D．approached it from different angles

单项选择题

It can be inferred from the passage that the author would ______.

A．advocate a carefully managed economy
B．prefer the employment rate to rise arid fall with the value of the gross national product as a check on labor costs
C．perceive high unemployment as undesirable, but unavoidable
D．contend that manipulation of the size of the labor force would prevent recessions in the years noted