5.【答案】【解析】由于新型冠状病毒的遗传物质是单链RNA,故变异性强,呼吸道中的黏膜对病原体的阻挡作用没有持异性,因此对其各种变异体均有阻挡作用,A项正确;吞噬细胞吞噬并杀死新型冠状病将的过程属于非特异性免疫,B项销误:当新型冠状病毒初次进入人体时,人体中还没有形成针对该病毒的抗体,已有的抗体不能与之结合,C项错误:被效应T细胞裂解的是靶细胞,而不是新型冠状病毒,D项错误

One possible versionDear Terry,How is everything? I'm glad to learn from the official website of our school that our school will establishswimming club. Since you are enthusiastic about swimming, I am writing to invite you to join the swimming cluband make friends with Chinese swimming fans.There will be a variety of activities for the swimming club, including practicing swimming every Fridayafternoon and having opportunities to take part in swimming competitionsIf you are interested, please send your application to the following email addreessswnningclub@126.combefore next Monday.Yours truly,

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