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- 问题详情：Animalsseemtohavethesensetoeatwhentheyarehungryandtheydonoteatmorethantheirbodiesneed.Ithasbeenshownthatratswill,whengivenachoiceoveraperiodoftime,preferwaterwithvitamins(维生素)towaterwithoutvitaminseventhoughthereisnodifferenceintasteorsmel...
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