单项选择题

Our preferences for certain colors are ______.

A．associated with the time of day
B．dependent on our characters
C．linked with our primitive ancestors
D．partly due to psychological factors
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单项选择题
Manufacturers found out that color affects sales ______.
A．by experience over a long period of time
B．by experimenting with different colors
C．by trying out color on blind people
D．by developing the discipline of color psychology
单项选择题
We may infer from the context that proponents (Paragraph 3) most probably means ______.
A．arguments in support of something
B．disagreements
C．people who argue for something
D．people who argue against something
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