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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大学英语三级B级

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