2022英语周报 八年级新目标第28期答案

18.AB据图可知,在减数分裂过程中,X与Y染色体的同源区段能发生交叉互换,因此在减数分裂过程中X与Y染色体能发生交叉互换的区段是I,A错误;根据图分析可知,白花的基因型为g,红花的基因型为Gee,紫花的基因型为GE。让纯合的红花雌株(GGXX)与紫花雄株(GGXY)杂交,子代中雌株都开紫花,雄株都开红花,B错误;让杂合的白花雌株(ggXX)与紫花雄株(GgXY)杂交,子代中纯合的白花植株所占比例为1/2×3/4=3/8,C正确;紫花雌株的基因型有GGXX、GGXGgX2X、GgXX,与ggXY杂交子代能出现白花个体,该紫花雌株的基因型为 GgXEXE、 GgXEX,D正确

第一节One possible versionDear Fairy,Im pleased to hear that you want to learn something about Calligraphy Club in our school.The Calligraphy Club is divided into primary class and advanced class. Primary class is suitable for peopldewithout foundation while the teaching of advanced class is more specialized. There are two lessons a week foreach level. The classroom is on the third floor of Student Activity Center. The general requirements ofcalligraphy are very simple. In addition to mastering some basic skills, the most important thing is persistence.Each day the learners have to spare their free time to stick to practice.Finally, I suggest you can come to class to experience if you like. Then decide whether to join the club.ours truly,Li Hua

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