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

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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