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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单项选择题
The reason why birds don't get lost on long flights ______.
A．have been known to scientists for years
B．have only recently been discovered
C．are known by everyone
D．will probably remain a mystery
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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