【单选题】The meaning of the underlined words in "the details of spontaneous family relationships" can be expressed as ______.
A.natural family relationships
B.quickly occurring family relationships
C.animals acting like a natural family
D.animal family behavior that cannot be preplanned or controlled
网考网参考答案:D
网考网解析:
从文中第二段后半部分讨论的就是动物的许多行为都是不可预知和控制的,包括自发的亲属行为。
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