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
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
单项选择题
Which is NOT described as a source of the problems facing the 1970s' Yugoslavia
A．Lack of regional cooperation.
B．Religious conflicts.
C．Competition for resources.
D．Discrimination against ethnic minorities.
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