2022英语周报高一外研4期答案

2.【答案】D【解析】病毒只能在活细胞中繁殖,不能用培养基培养,A项错误:SARS-CV-2是RNA病毒但不是逆转录病毒,因此其遗传信息传递过程中不存在DNA复制,进而也就用不到DNA聚合酶B项错误;抗原不能刺激浆细胞,C项错误;单链RNA不稳定,容易发生突变是疫苗有效期不长的主要原因,D项正确

第一节短文改错Fishing is one of my hobby. I like sitting by the river and enjoying the quietness of the naturehobbiesHooking big river fish is also expected. The other day, I go fishing with my father. We arrived,ourwentusual fishing site early in the morning, To our great surprised, the once-clean place was litteredsurprisewith trash. We found empty bottles and various packaging bags throwing everywhere. So we decidedthirownto pick it up first, and halt an hour late, we finished cleaning up the site, We lost some timeemercollecting the rubbish, and it was worth the effort, I think someone who truly love the great outdoorsbutovesshouldn't litter around while fishing in the wild

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