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【单选题】
近期，上海、安徽、江苏等地相继出现H7N9流感病毒。流感病毒可分为甲（A ）、乙（B ）、丙（C ）三型。而禽类特别是水禽是所有这些流感病毒的自然宿主，H7N9流感病毒是其中的一种。它既往仅存在禽间发现，未发现过人的感染情况。这体现出（）①自然界具有物质性②价值判断具有社会历史性③事物是变化发展的④联系具有多样性A.
①③
B.
①④
C.
②③
D.
②④
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