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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热门试题

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

单项选择题

The author of this article is ______.

A．revealing his low opinion of mankind
B．poking fun at geneticists
C．expressing his doubts about the possibility of breeding a super-ape
D．presenting a reasonable theory in a humorous tone