2022智慧上进文科答案

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5.解析:选CA、三倍体无子西瓜的育种方法是多倍体育种,原理是染色体变异,属于可遭传变异,A错误;B、培育青霉素高产菌株是人工诱导基因突变,不是基因重组,B错误;C、R型活菌部分转化为S型活菌,原理是基因重组,属于可遭传变异,C正确;D、单倍体植株的培育属于染色体数目变异,是可遭传变异,D错误。故选:C

第四部分写作第一节短文改错Dear Mr.Headmaster,I am writing to draw your attention to some proper behavior among us students like littering.Itimproper(形容词构词法)makes our school dirty but unpleasant,and do harm to the image of our school.and(并列连词)does(主谓一致)I always feel ashamed whenever I see this.It is clear not appropriate what students litter anywhere.clearly(形副用法)that(主语从句)I wonder if the school could to place more dustbins around and set up specific rules for such bad behavior.(情态动词)against(介词)At the same time,students should be encouraged to develop good habits and behave ourselves.I believethemselves(反身代词)that,with the joint effort of teachers and students,our school will becomeAmuch better place in the nearefforts(名词的数)a(冠词)future.Thank you for your consideration.Yours faithfully,Li Yue第二节书面表达（略）