[名词解释] 终宿主definitive host

寄生虫生活史life cycle 保虫宿主reservoir host 转续宿主paratenic host 共栖commensalism 钢轨伤损中表示一点重伤的标记是（）。 ["A、∣←△△△→∣","B、↑△△△","C、→△△△←","D、↗△△△↖"] 终宿主definitive host