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

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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.

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