单项选择题

The experiment with the dove implied that ______.

A．birds should be taught to navigate
B．a dove 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

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单项选择题

In total darkness, doves ______.

A．use lights to find their way
B．don't know which way to fly
C．made their return flight by themselves
D．wait for the stars to appear