单项选择题

Our feelings about external reality have their origin in ______.

A．our heart
B．events that affect us personally
C．our immediate environment
D．our subjective being
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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
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
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