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
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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
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
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