请问您有学英语周报2022至2022答案

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

24.(13分)(1)cDNA(1分)cDNA文库中没有内含子(1分),大肠杆菌是原核生物,其基因结构与cDNA结构更接近(1分)DNA聚合酶不能从头开始合成DNA,而只能从3端延伸DNA链(2分)提供反应所需的原料和能量(2分,全对才给分)(2)无菌水(1分)未发生(1分)(3)抗性菌增殖,降解了CRO,使营养菌能存活并增殖(2分):营养菌增殖,分解乳糖,代谢产物为抗性菌生长提供碳源(2分)

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