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

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单项选择题

In the author's opinion, the idea that geneticists could produce a super-ape is ______.

A．irrational
B．plausible
C．biologically impossible
D．demonstrably true

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