实验人�想了解一下新孵化的鸟类是怎样获得母亲的情感的．他们选择了六只刚孵化的小鸭平均分成甲乙两组．甲组小鸭刚孵化出来就被从它们的出生地移走 Sketch Coloring Page

实验人�想了解一下新孵化的鸟类是怎样获得母亲的情感的．他们选择了六只刚孵化的小鸭平均分成甲乙两组．甲组小鸭刚孵化出来就被从它们的出生地移走 Template

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