2018.2022英语周报八年级上册第五答案

作文Dear Sir/ madamI'm Li Hua. I' m writing to you to complain about a problem with some books I ordered from yourwebsiteOn 3rd September, greatly delighted, I ordered ten books from your online store, hoping to read all thebooks within three months. It was true that I was greatly excited when the books arrived. However, hardlyhad I seen those books when disappointment quickly struck me because only nine books were lying in theparcel. In addition, what annoyed me more was that only six of them were what I had ordered while theother three were delivered here by mistake. Therefore, could you please arrange for the rest of my orderto be sent to me as soon as possible? Otherwise, please give me a refund. Meanwhile, I would appreciate itif you could let me know what I should do with the three books that I didnt orderI would be extremely grateful if you could look into the matter as soon as possible and get it settled bynext week. I'm looking forward to hearing from you soonLi Hua

生物(一)C病毒营寄生生活,侵染宿主细胞并在宿主细胞内大量增殖,这个过程需要宿主细胞的核糖体合成病毒的蛋白质外壳,原料也由宿主细胞提供,A错误;2019-nCOV病毒内只有RNA,没有DNA,遗传物质是RNA,B错误;人体对该病毒的免疫机理属于特异性免疫(体液免疫和细胞免疫),与体液中杀菌物质(如溶菌酶)灭菌原理(非特异性免疫)不同,C正确;病毒导致宿主细胞破裂有两种情况,一是效应T细胞作用下主动死亡,即细胞凋亡,二是病毒大量繁殖导致宿主细胞破裂死亡,即细胞坏死,D错误伽为实验的因变量,相

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