单项选择题

This selection is primarily concerned with ______.

A．the eye's adaptation to color
B．the properties of colored surfaces
C．the color of colors
D．the effect of changes in color intensity
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单项选择题
Whether a colored object would, on two viewings separated in time, appear to the viewer as similar or different in color would depend mostly on ______.
A．the color mechanism of the eye in use at the time of each viewing
B．whether the object was seen in artificial or natural light
C．what kind of viewing had immediately preceded each of the viewings
D．the individual's power of lateral adaptation
单项选择题
If a person's eye has been looking at an object in bright sunlight for some time, and then shifts to an object not well lit, we can expect ______.
A．a time lag in the focusing ability of the eye
B．some inability to see colors of the latter-named objects until loss of sensitivity has been regained.
C．the immediate less of the "afterimage" of the first object
D．the adaptation in the central area of the eye but little adaptation in the lateral areas to thenew intensity level.
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