2022高二英语周报第5期答案

37.[生物一选修1:生物技术实践]CHCOOH(1)碳源、氮源和维生素(2分)中性或微碱性(2分)(2)未将灭菌锅内的冷空气彻底排除(2分)将未接种的培养基在适宜的温度下放置一定的时间,观察培养基上是否有菌落产生(2分)(3)伊红美蓝(2分)防止冷凝水滴落污染培养基(2分)黑(1分)防止因培养时间不足而遗漏菌落数目(2分)【解析】本题主要考查微生物的培养和鉴定,考查学生的理解能力、实验与探究能力和综合运用能力。鉴别大肠杆菌时需要用伊红美蓝固体培养基,大肠杆菌的菌落为黑色

One possible version:Dear Sir/ MadamKnowing that the First Snow Festival will be held during the winter holidays and some volunteers areneeded, I show great interest in it and want to get more experience. So Pm writing the letter to recommendHonestly speaking, I have rich experience as a volunteer, since I have served as a volunteer in intema-tional competitions. What's more, I'm outgoing and good at communicating with others, making it easy for meto get along with others. Above all, I have a good command of English, and can make myself understoodTherefore, I can serve foreign tourists welId appreciate it if you could give me such a chance. Looking forward to your replyYours

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