3.B由于 COVID-19的遗传物质是单链RNA,更容易发生基(因突变,基因突变可为生物进化提供原材料,所以A正确;COVID-19和麻风杆菌都是胞内寄生生物,但是麻风杆菌的条是细菌有自己核糖体,所以麻风杆菌合成蛋白质不需要宿主细胞的核糖体,所以B错误; COVID19侵人细胞需要=和细胞膜上ACE2蛋白结合,体现了细胞膜的信息交流的分功能,所以C正确:CVD=1的RNA翻译出的RNA菜合酶催化RNA合成时,以RNA为模板,所以D正确。

应用文写作( One possible versionDear FrankWe plan to participate in the weeklong labor practice in the school field base scheduled from August Ito 8. Im writing to invite you to Join usThe base offers free accommodations and various activities. Participants can learn to do outdoor worklike farming or gardening. The art of making tea, which interests you very much, is also taught. Whatattracts me most is that we'll learn to raise animals such as goats or rabbitsIn the practice, we can experience the value of labor and expose ourselves to a wide range of practicalskills, which will surely benefit usLooking forward to your replyYoursLiH

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