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

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问题 The reason why birds don’t get lost on long flights ______.
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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