第二节One possible wersionQuich, dets get some wet pawer toneis, " seid JudyEveryone sprang into action. Afler rubbing haid, ty namestill remained. I think I slw H can of cleaner by the sinkin thc coat room." I said as i raced to find it. We rubbedwith the cleaner and my name came off, but in the processof removing it. wc: left a friction Imark on the chulkbuurdHearing footsteps coning, we dried the wul urea as much aswe could with more paper towels.We were just slipping into our desks when the bell rengThe other students bewan entering the classroom. Theteacher walked in soon afterwards. Mrs. Eimer never askelabout the friction mark. Muybe she never nol iced il, lul Tdid. Every time I walked past the chalkboard, I remem-bered it. The lesson I leaned thot day is that"No one willever krow is never True, Even if no one else found out. Imyself knew. Sometimes living with, a guilty consciene ia

27.(1)Co+H:SO-Cos(+H2↑(2分)2Fe+2H+HO-2Fe2-+2H1O(2分)(2)萃取分液(1分)取最后一次的洗涤液少许于试管中,滴人盐酸酸化的氯化钡溶液,若无沉淀生成,则证明已洗涤净(2分)(3)Co()+2Ho2+H2O(1分)A(OH)1、Fe(OH)2(1分)(4)<(1分6-830℃2Co0O)(2分(5)①CoC2O1(2分)②6C0+O2

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