单项选择题

A．Since
B．Like
C．For
D．Unlike
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单项选择题
A．byB．inC．withoutD．with
A．by
B．in
C．without
D．with
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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