单项选择题

The author indicates that most important advances made by mankind dome from ______.

A．technical applications
B．apparently useless information
C．the natural sciences
D．the biological sciences
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单项选择题
It can be inferred from the passage that to the author man's need to know is chiefly important in that it ______.
A．allows the human race to progress technically
B．encompasses both the physical and social sciences
C．defines his essential humanity
D．has increased as our knowledge of the world has grown
单项选择题
The title below that best expresses the ideas of the passage is ______.
A．Technical Progress
B．Man's Distinguishing Characteristics
C．Learning for Its Own Sake
D．The Difference Between Science and Philosophy
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