单项选择题

The author points out that the Greeks who studies conic section ______.

A．were unaware of the value of their studies
B．were mathematicians
C．resigned
D．were interested in navigation
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单项选择题
The most important advances made by mankind come from ______.
A．apparently useless information
B．the natural sciences
C．philosophy
D．technical applications
单项选择题
The practical scientist ______.
A．is a philosopher
B．is interested in the unknown
C．knows the value of what he will discover
D．knows that the world exists
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