单项选择题

A problem that has plagued some fictional Utopias is ______.

A．creation of super-apes
B．the necessity of breeding super-humans
C．the necessity of breeding subhumans
D．the degradation of beasts
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单项选择题
The present selection has apparently been preceded by some explanation of ______.
A．some experiments with color pigments
B．the nature of color
C．the color properties of various surfaces
D．the mechanism of the eye's adaptation to color
单项选择题
The type of job an ape could do without supervision would be one which is ______.
A．repetitive
B．mechanized
C．unusual
D．intricate
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