- Thebellrangandtheclasswasover.Theclassroombecamenoisy.Somestudentswentoutoftheclassroom.IwasjustchattingwithsomeofmyclassmateswhenLiHongcametome.Shesmiledandsaidtome,"What'sfourminusfour?Doyouknow?""It'szero.Thatiseasy."answeredI.ButLiHongsho...
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