2022英语周报第49期答案

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

31.(10分,除标注外,每空1分)(1)RNA蛋白质宿主细胞的核糖核苷酸(2分)2)没有细胞结构〔2分)宿主细胞3)胞吐冠状病毒外的包主要来源于宿主细胞膜,且新生病毒以出芽方式择放,故冠状病毒出细胞的方式是胞吐(2分)【解析】(1)冠状病毒是RNA病毒,病毒的主要成分是RNA和蛋白质,其遗传物质的合成原料是宿主细胞的核糖核苷酸。(2)病毒没有细胞结构。因冠状病毒外包膜主要来源于宿主细胞膜,宿主细胞膜蛋白由宿主细胞遗传物质决定,故包膜蛋白主要由宿主细胞遗传物质决定。3)冠状病毒外的包膜主要来源于宿主细胞膜,且新生病毒以出芽方式释放,故冠状病毒出细胞的方式是胞吐。

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