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

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单项选择题

Which of the following could be the most suitable title

A．The Discipline of Color Psychology
B．Color and Its Connotations
C．The Practical Use of Color
D．Color and Feelings

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