2021-2022 英语周报 高二 新课程 31答案

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

24.(14分,每空2分)(1)BC→A(2)液体初步筛选PVA降解菌,并增大其浓度(3)①1.6×10②错误应该将不同稀释倍数的稀释液分组、分别涂布在多个平板上,取菌落数在30~300个之间的平板进行计数(4)显微镜直接计数法【解析】(1)实验室制备牛肉膏蛋白陈固体培养基的操作顺序:计算、称量→亠溶化→调节pH→分装包扎→高压蒸汽灭菌→倒平板。(2从化工污水中取样后,应将样品置于以PVA为唯一碳源的液体培养基上进行选择培养,其作用是初步筛选PVA降解菌,并增大其浓度3)①以平均菌落数16进行计数,可求得原菌液中PVA降解菌浓度为16÷0.1×105=1.6×107个/mL。②该同学的计数方法错误,应该将不同稀释倍数的稀释液分组、分别涂布在多个平板上,取菌落数在30~300的平板进行计数。(4)某些食品工业(如酸奶等)的质量检测,应果用显微镜直接计数法统计细菌的数目。

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