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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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
单项选择题
The economic development of Yugoslavia is directly hindered by ______.
A．the competition among its republics
B．the conflicts between the ethnic groups
C．the absence of a large modernized port
D．the existence of four distinct languages
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