2021-2022 英语周报 高三 hz答案

Li Hu第二节(满分25分)Green realized it was an emergency. Mary might faint at any time. If she couldnt receivetimely help, she would suffer severe brain damage, or even die, which would definitely scare hertwo grandchildren. Concerned that she was in such a critical situation where every minute countedfor her life, he immediately called the hospital to find her an ambulance. After being informed ofwhat was going on, two teachers dropped everything without delay, climbed into Greens car andset off. (75 words)When Green and the other two teachers reached the family's home less than ten minutes later,seeing what was happening, they sighed in relief. Everything was well in order. The doctors weregiving first aid to Mary, pressing on her chest. The two kids looked visibly shaken, close to tearsBeside them stood Julia, holding them in her arms and comforting them. Fortunately enough, thequick response from Julia and Green saved Marys life. When she came to herself, she was lifted tothe ambulance and rushed to the hospital. Everybodys face brightened up as the ambulance fadedaway. (75 words

32.(1)R和r(回答完整才得分)(1分)B系和R系(1分)(2)繁殖A系的方案:以A系作母本与B系杂交,从A系植株上收获的F1即为A系(2分)繁殖B系的方案:B系自交即可实现繁殖(2分)繁殖R系的方案:R系自交即可实现繁殖(2分)(3A系花粉不育,只能作为母本杂交,从A系植株上收获的F1的核基因型均为Rr。若用B系与R系杂交,由于二者均能自交,F1的核基因型中除Rr外,B系上还有rr,R系上还有RR,因此需要对母本品系进行人工去雄处理,花小且工作量大,难以大量获得(4分)解析:(Ⅰ)核基因才会遵循基因分离定律,质基因不会遵循此定律;A系为雄性不育系,不能产生可育花粉。(2)因A系为雄性不育系,因此繁殖A系时要以A系作母本与B系杂交,A系提供质基因S、核基因r,B系提供核基因r;繁殖B系只需要B系自交即可;繁殖R系只需要R系自交即可。(3)A系花粉不育,只能作为母本杂交,从A系植株上收获的F1的核基因型均为Rr。若用B系与R系杂交,由于二者均能自交,F1的核基因型中除Rr外,B系上还有r,R系上还有RR,因此需要对母本品系进行人工去雄处理,花小且工作量大,难以大量获得

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