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
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单项选择题
The experiment with the dove indicated that ______.
A．birds have to be taught to navigate
B．a bird that has been caged will not fly long distances
C．some birds cannot fly at night
D．some birds seem to follow the stars when they fly at night
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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