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课程多端同步更新，充分利用零碎时间。做题
海量精选试题，想练就练，瞬间提分。答疑
网校名师24小时在线答疑解惑。直播
名师大咖面对面，有问有大收获多。Because American children expect fair exchange for their lost teeth， it is likely that the tooth fairy ritual derives more immediately from the European， and particularly German， tradition of placing a lost tooth in a mouse or a rat hole.The folk belief governing this practice is that when a new tooth grows in， it will possess the dental qualities， not of the original， lost tooth， but of whatever creature finds it， so the creatures of choice would be those world-class champers， the rodents.
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