第四部分写作第一节Dear Jack,Welcome to our school to study as an exchange studentAs for how to borrow books from the school libraryyou need to have your student ID card and present it to thelibrarian, who can register for you. Then you can go to thebookshelves to look for what you need. You can borrow 2books once and keep them for a week in order that you canhave enough time to finish reading them. If you haventread the book through, you can renew it. You' ll have topay for it if you get the book damaged or lost.hope all this can be of help to you. For morenformation, don,t hesitate to ask meLi Hua

9C(解析:图甲中染色体上出现基因A、a可能是同源染色体的非姐妹染色单体交叉互换的结果,也可能是R基因突变的结果,且基因A、a所在的染色体不是X染色体,而是常染色体,A错误;图甲细胞中每条染色体含有2个DNA分子,对应于图乙中的bc段;图甲细近胞进行的是减数分裂,而图丙表示有丝分裂,B错误:植图乙中的bc段表示有丝分裂前期和中期、减数第一次的分裂、减数第二次分裂前期和中期,而图丙中的段正表示有丝分裂后期,因此图乙中的bc段和图丙中消的h段不可能对应于同种细胞分裂的同一时期,C正确;图乙中cd段形成的原因是着丝点分裂,D错误。舰如,山音可知,蛋白质性的原因可能是榜

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