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Last Sunday in the library,t[文]here was an old woman in front of me check out several books.The[章] li-checki[来]ngbrarian[自] asked herthatt she wanted to pay the $4.25 fine on her account.S[知]he hesitated[嘛] for severalif[答]/whethers[案]econds or more,afte[网]r what she said in a softly voice,"I can pay only one dollar today.whi[文]chsoftI looked into my purse and found a 5-dollar bills.I gave it to the librarian[章] and said that I'd cover herbillfi[来]ne with that.Afte[自]r the librarian[知] handed me to my change,I pushed the woman's dollar back to her andtold her the fine had A taken care of.She is amazed and thanked me.Then he walked away feelingbe[嘛]enwassheg[答]ood.I felt good,eith[案]er.too
【答案】A【解析】[网]蛋白质、核酸等物质[文]在细胞中的功能是由[章]其组成和结构决定的[来]；观察花生子叶中的[自]脂肪颗粒需用体积分[知]数为50%的酒精溶[嘛]液洗去浮色；检测还[答]原糖时需将斐林试剂[案]加入待测样液，混匀[网]后水浴加热才可出现[文]砖红色沉淀；检测蛋[章]白质时需使用双缩脲[来]试剂，应先加NaO[自]H溶液创造碱性环境[知]，混匀后再加CuS[嘛]O4溶液。
