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
As can be gathered from the passage, Kosovo ______
A．is one of the six republics
B．is part of Serbia
C．is autonomous
D．borders on Serbia
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