题目内容
Pigeon racing is only popular in Belgium.
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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.
食物因素中,对致龋最有影响的物质是____C.蛋白质B.乳糖A.蔗糖E.氨基酸D.维生素
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