聽課
課程多端同步更新，充分利用零碎時間。做題
海量精選試題，想練就練，瞬間提分。答疑
網(wǎng)校名師24小時在線答疑解惑。直播
名師大咖面對面，有問有大收獲多。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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