单项选择题

In the paragraph 3, "his outdoor cousins" means ______.

A．other relatives
B．the other doves of the same brood (n. 窝)
C．doves under the natural sky
D．other birds in general
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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
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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