单项选择题

What three primary colors do we see

A．Red, white, and blue.
B．Red, green, and yellow.
C．Red, green, violet.
D．Red, green, blu
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单项选择题
In what part of the eye are the rods and cones located
A．Cornea.
B．Lens.
C．Retina.
D．Optic nerv
单项选择题
Which of the following statements is TRUE
A．We see all the colors that animals can see.
B．Sunlight contains all the colors.
C．Color blindness is due to cone problems.
D．Rods are not as sensitive as cones.
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