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 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

答案B

解析 见最后一段末句“But when it’s too dark to see these,the doves circle helplessly,unable to find their way.”,可知,B为正确选项。
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