单项选择题

A．Its obscure definition.
B．Its unknown causes.
C．Its controversial treatment.
D．Its unnoticed symptoms.
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单项选择题
A．He can’t afford to buy the ticket.B．He needs a break from the math problem.C．He doesn’t want to go to the opera.D．He’ll meet the woman when he has finished the math problem.
A．He can’t afford to buy the ticket.
B．He needs a break from the math problem.
C．He doesn’t want to go to the opera.
D．He’ll meet the woman when he has finished the math problem.
单项选择题
A．Competition in business.B．Government grants.C．A type of economic policy.D．International transportation practices.
A．Competition in business.
B．Government grants.
C．A type of economic policy.
D．International transportation practices.
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