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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According to the classification of consumer motives, ___________ should belong to the category of emotional motives.
A．color
B．durability
C．fashion
D．service
单项选择题
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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