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
During daylight hours, birds ______.
A．fly aimlessly
B．rely on landmarks
C．use sun for guidance
D．are more likely to get lost
单项选择题
______ how to do, the little boy cried.
A．Not knowing
B．Don't know
C．Knowing not
D．Not known
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