单项选择题

A．The weakness of the price system.
B．The complexities of the price system.
C．Credit terms in transactions.
D．Resource allocation and the public service
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单项选择题
A．To explain why people fail to act in emergencies.B．To explain when people will act in emergencies.C．To explain what people will do in emergencies.D．To explain how people feel in emergencies
A．To explain why people fail to act in emergencies.
B．To explain when people will act in emergencies.
C．To explain what people will do in emergencies.
D．To explain how people feel in emergencies
单项选择题
A．A box.B．A young tree.C．A book.D．Apples.
A．A box.
B．A young tree.
C．A book.
D．Apples.
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