单项选择题

In total darkness, doves ______.

A．use landmarks
B．don't know which way to fly
C．fly back home
D．wait for the stars to appear
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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
单项选择题
It was in the park ______ I met him the first time.
A．that
B．where
C．how
D．when
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