单项选择题

What is the main purpose of the passage

A．To outline contrasting types of economic systems.
B．To explain the science of economics.
C．To argue for the superiority of one economic system.
D．To compare barter and money-exchange markets.
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单项选择题
The author seems to suggest getting to know ____________ is critical to market success.
A．consumers' problems
B．consumers' motives
C．consumers' experience
D．consumers' needs
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Clearly, the author of this passage is ___________ the distinction between rational and emotional motives.
A．in favor of
B．opposed to
C．uncertain about
D．interested in
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