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A．Almost all her life.
B．Less than half her life.
C．Until 1830.
D．Before 1873.
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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 economics systems.
D．To compare barter and money-exchange markets.
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