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
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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
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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