A.differs among animal species B.to psychological distance C.begin to attack D.to physiological distance E.distance between an a

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问题 A.differs among animal species
B.to psychological distance
C.begin to attack
D.to physiological distance
E.distance between an animal and its enemy before fleeing
F.distance between certain animal species before fleeing
Social distance______.

选项

答案A

解析 动物间的社会距离不同。文中原句为:Social distance varies fron species to species.
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