2022 英语周报 八年级 黔西南专用 15答案

6.C【解析】N是蛋白质和DNA共有的元素,若用N代替P标记噬菌体的DNA,则其蛋白质也会被标记,不能区分噬菌体的蛋白质和DNA;噬菌体的蛋白质外壳是由噬菌体的DNA作模板,利用大肠杆菌体内的原料编码合成;子代噬菌体DNA合成的模板来自于亲代噬菌体自身的DNA,而合成的原料来自于大肠杆菌;该实验证明了噬菌体的遗传物质是DNA故选c

第一节One possible versionDear Ms JenkinsI'm writing to ask you for help. Our school is going to sponsor an exhibition of Chinese paintings in theschool library next month. As president of the student council, i have been assigned the job of drafting an arnouncement in English as there aredreds of international students in our schoohave already written a rough draft of the above-mentioned announcement. But I'm afraid that there aresome mistakes in the English language. So I am hoping you would correct my possible mistakes in the announce-ment that i have attachedId appreciate it if you could do me the favocerely yourLIH

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