单项选择题

A functional decline is ______.

A．the reduction in brain nerve cells
B．the decline in memory
C．the loss of cells in hearing process
D．the shrinkage in muscle tissues
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单项选择题
The most important advances made by man come from ______.
A．technical applications
B．apparently useless information
C．the natural sciences
D．the study of philosophy
单项选择题
It can be inferred from the passage that man' s need to know is chiefly important in that it ______.
A．allows the human race to progress technically
B．comprises both the physical and social sciences
C．demonstrates human adaptability
D．defines his essential humanity
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