By“his outdoor cousins”the author means ________.
A.) other experimenters
B.) the other doves of the same brood
C.) doves under the natural sky
D.) other birds in general
正确答案是C
By“his outdoor cousins”the author means ________.
A.) other experimenters
B.) the other doves of the same brood
C.) doves under the natural sky
D.) other birds in general
正确答案是C