题目内容
In a race, a rubber ring is placed on each participating pigeon’s leg to mark the time.
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Pigeon racing is only popular in Belgium.
Airline pilots have various aids to guide them on their journey.
Scientists have found out how pigeons find their way home but they keep it as asecret.
It’s certain that pigeons, like airline pilots, have various aids to guide them in their long-distance flights.
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