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

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

单项选择题

Those who want more economic growth believe that continued economic growth ______.

A．is essential to the well-being of society as a whole
B．can provide the solution to many of our social problems today
C．can protect our environment from being polluted by industry
D．can provide us with more natural resources for industrialization