单项选择题

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
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单项选择题
In total darkness, doves ______.
A．use landmarks
B．don't know which way to fly
C．fly back home
D．wait for the stars to appear
单项选择题
During daylight hours, birds ______.
A．fly aimlessly
B．rely on landmarks
C．use sun for guidance
D．are more likely to get lost
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