The reason why birds don’t get lost on long flights ______. [br] In total darkne

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问题 The reason why birds don’t get lost on long flights ______. [br] In total darkness, doves ______.

选项 A、use landmarks
B、don’t know which way to fly
C、fly back home
D、wait for the stars to appear

答案 B

解析见本文最后一句：But when it’s too dark to see these，the doves circle helplessly，unable to find their way．

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Thereasonwhybirdsdon’tgetlostonlongflights______.[br]Intotaldarkne