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第四部分写作第一节[文]Dear elviraIm Li Hua. Our club is going to hold an Englishpo[章]etry party. Knowing you re intereste[来]d in poetry, T'mwriting to invite you to join in this activity.[自]It will be held in our school hall at 9 next FridayAft[知]er our teacher delivers a speech on English poems, allmember[嘛]s of the club will share their favourite[答] Englishpo[案]ems. Afterward[网]s, we will pick out popular poemswhic[文]h will be posted on the school,s informati[章]on boardWhat[来]'s more, we would appreciat[自]e it if you could shareyour[知] favourite[嘛] poemYou're definitel[答]y welcome to join us. Looking forwardto[案] your early reply.You[网]rs.Li Hua
12.A解析：本题[文]考查遗传物质的探究[章]及本质等有关知识。[来]孟德尔发现遗传因子[自]并证实了遗传因子的[知]传递规律，但没有发[嘛]现遗传因子的化学本[答]质，A项错误；噬菌[案]体侵染细菌时只有D[网]NA进人细菌，蛋白[文]质外壳留在细菌外，[章]这样DA和蛋白质就[来]彻底分开了，因此噬[自]菌体侵染细菌实验比[知]肺炎链球菌体外转化[嘛]实验更具说服力，B[答]项正确；沃森和克里[案]克在探究DA结构时[网]利用了物理模型构建[文]的方法，C项正确；[章]烟草花叶病毒感染烟[来]草实验说明该病毒的[自]遗传物质是RNA,[知]D项正确。
