单项选择题

During daylight hours, birds ______.

A．wheel back and forth
B．follow the stars in their flights
C．use sun for guidance
D．are quite 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 many years
B．have only recently been discovered
C．are known by us
D．will probably remain a mystery
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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