单项选择题

This article is mainly about ______.

A．color blindness
B．color differences.
C．color psychology.
D．color discoveries.
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单项选择题
Fire engines and ambulances in some communities are painted in ______.
A．red as a signal of danger.
B．green for it is associated with defense and self-preservation.
C．blue which is a calming color.
D．yellow, which can produce a more basic state of alertness and alarm.
单项选择题
The Universal Product Code _____.
A．makes grocery shopping easier
B．makes grocery shopping complicated
C．cuts down on efficiency
D．will never be practical
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