英语周报高一课标2021-2022第21期答案

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

One possible versionSeveral minutes later, the ice broke suddenly and Harry's feet sank into the water. It was noep, but his legs got wet to the knees. Harry was so upset that the accident would delay hisschedule. He had to find some firewood to build a fire to dry his clothes. He pulled off his glovestook out his matches, and lighted the fire. Seeing the burning fire, he had thought he was safe. Butsuddenly, without warming, a heavy mass of snow dropped down. The flame of hope was put outUnluckily, his dog ran away and the fear of death came over Harry. He had no choice but torun to save himself. However, he did not feel his feet when they hit the ground. Having falleneveral times, he decided to rest a while. As he lay in the snow, he noticed he was not shaking. Hecould not feel his nose or fingers or feet. A feeling of horror came into his mind. It was when herealized he was going to die that he heard a bark and the noise his friends made

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