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)

第一节Dear Mr GeorgeI am Li Hua, a volunteer of the activity"Englishi Communication to the Mountains". Now, I'm writing toexpress my sincere apology to you for not being present atthe activity to be held next Monday.The reason for my absence is that I suddenly fell illMy parents sent me to hospital, and I have to stay therefor a week. As for my volunteer work, I have asked myclassmate Tom to do it.Sincerely hoping that you can accept my apologiesYours.Li Hua

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