急求牛津英语模块三unit1 project‘ the wonderful world of pigeons’ 最后一段
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How do pigeons find their way?Pigeons appear to have a compass inside them that tells them which way is north.How this compass works remains a mestery .Of course,since a compass alone is not enough to find one's way,they also appear to use their sight and even their sense of smell to tell them which way they should go.Unlike humans,they never get lost and can always find their way home.
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