单项选择题

A．How the survival skills of the early people influenced their diets.
B．This need to learn how to save money.
C．The increasingly complex relationship between values and the use of money.
D．The difficulty of trading larger and larger amounts of good.
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单项选择题
A．Because of its size.B．Because of its fuel.C．Because of its complicated engine.D．Because of its burning time.
A．Because of its size.
B．Because of its fuel.
C．Because of its complicated engine.
D．Because of its burning time.
单项选择题
A．This need to use the services of people who were not physically near.B．This need to have a common set of values.C．The fear of things that were more different than what people were used to.D．This need to store wealth.
A．This need to use the services of people who were not physically near.
B．This need to have a common set of values.
C．The fear of things that were more different than what people were used to.
D．This need to store wealth.
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