2018-2022英语周报新课际答案

13.B【解析】细胞分裂间期DNA进行复制,在有丝分裂中期细胞中有3种颜色,8个荧光点;若发生交叉互换个次级精母细胞中可能有3种颜色(A、a、B),4个荧光点;精原细胞经过复制得到初级精尔细胞,一个初级精母细胞中有3种颜色,8个荧光点;正常情况下,A与a分离,B与B分离,所有精细胞中都有2种颜色,2个荧光点。故选B。

书面表达One possible version:Dear Mr. Charles,I'm Li Hua, an exchange student in our school. Hearing that you re looking for a host for the comingChinses Ancient Poetry Recitation Contest, I'm writing to recommend myself. I think I' m the right person.To begin with, I'm interested in Chinese ancient poetry and good at recitation, meaning I know how to dealwith emergencies. In addition, I'm fluent in both Chinese and English, which enables me to host the competitionwithout language difficulty. More importantly, I' ve had many experiences of being a host, so I need no trainingfor itPlease take my application into careful consideration. I' m expecting your earliest reply.Yours sincerelyLi Hua

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