41. 下列敘述何項最符合節肢動物的 circulatory system 之狀態？
(A) a closed circulatory system
(B) a tube-within-tube circulatory system
(C) a branching circulatory system
(D) an open circulatory system

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統計： A(5), B(10), C(10), D(214), E(0) #827638