Red-feather currency is one of the world’ s______. [br] The supply of red-feathe

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问题 Red-feather currency is one of the world’ s______. [br] The supply of red-feather currency is regulated by the______.

选项 A、demands of inter-island trade
B、availability of the red feathers
C、number of belts made by the money makers
D、both B and C

答案 D

解析文章最后部分谈到这种红羽毛货币的供应的控制是取决于新红羽毛的多寡和制币人可制作的货币量。这正是选项B、C的内容，故我们应选D。

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