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【单选题】

一些奇异的动物在草坪上聚会，有独角兽(1个头、1只脚)、龙(2个头、4只脚)、三脚猫(1个头、3只脚)和四脚蛇(1个头、4只脚)。如果草坪上的动物共有58个头、160只脚，且四脚蛇的数量刚好是龙数量的2倍，那么有几只独角兽参加了聚会()

A.
7只
B.
9只
C.
15只
D.
24只
题目标签：独角兽四脚蛇双头龙
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