题目内容

You stare at waterfall for a minute or two, and then shift your gaze to its surroundings.

A. matched to six to seven million structures called cones.
B. confused in the body’s sensors of both rods and cones.
C. interpreted in the brain as what must be the case.
D. signaled by about 120 million rods in the eye.

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The visual sensor that is capable of distinguishing shades of color is called ___.

A. cones
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C. rods
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