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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热门试题

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

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