单项选择题

A．Competition in business.
B．Government grants.
C．A type of economic policy.
D．International transportation practices.
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单项选择题
A．Its obscure definition.B．Its unknown causes.C．Its controversial treatment.D．Its unnoticed symptoms.
A．Its obscure definition.
B．Its unknown causes.
C．Its controversial treatment.
D．Its unnoticed symptoms.
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