于是,他对圈养的八哥做了实验,并发现除了在阴天和那些由于分不清方向而变得焦躁不安的时候,事实上,它们一直都处在正确的迁徙方向.
a.实验表明圈养八哥缺乏方向感,会焦躁不安
b.实验表明在它们正常的迁徙途中,圈养八哥没有能力来标定他们自己
c.实验表明圈养八哥的焦躁不安的是没有原因的
d.实验表明除了在阴天的时候,圈养八哥的方向是准确的
英语翻译He then set up experiments with caged starlings and foun
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