短文改错Dear Mr Smith.Im writing to extend my sincerely thanks to you for your goodwill to me during your visit to London.sIncereOriginally I only wanted to call on you but convey my father's regards on my arrival in London the last week. But youinsisted that I stay in your house and attend to my life as if i were one of your family member. Your kindness made myattendedmemberstrip easier and happy than expected.appletWords fail to describe what grateful I am. I would like you to come A China and allow my family to returning yourretunkindness.Yours truly

19.【答案】【解析】ac为细胞间期,该时期进行蛋白质合成,因此c点RNA的种类和数量高于a点,A错误:该段包括前期和中期,两个时期同源染色体组数和每对同源染色体的条数都是2,B正确:ef段包括有丝分裂后期和末期,由于是有丝分裂,该细胞中存在等位基因,C错误:用药物抑制纺锤体形成,细胞中染色体不能移向细胞两极,但是着丝点到一定阶段断裂,最终每条染色体含有一个DNA分子,D错误

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