单项选择题

The rods of our eyes see ______.

A．colors
B．black and white
C．both colors and black and white
D．visible wavelength colors
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单项选择题
It can be inferred from the passage that ______.
A．the human eye is sensitive to all wavelengths
B．colors are related to wavelengths
C．there are more color-blind women than color-blind men
D．failure of rods cause color-blindness
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
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