2019。2022八年级英语周报答案

11.C【解析】在一个种群基因库中,某个基因占全部等位基因数的比率,叫做基因频率,A错误变异是不定向的,B错误:鹰对不同体色沙漠棉尾免的食概率不同,对其起到了定向的选择作用,C正确;共同进化是指不同物种之间,生物与无机环境之间在相互影响中不断进化和发展,而不同体色的沙漠棉尾兔是同一个物种,D错误。

书面表达命题立意:本题要求学生给留学生朋友 Peter写封电子邮件,邀请他来你家做客。该情境基于学生实际生活,并融人了英语元素。该题很好地考查了学生的英语核心素养,同时也考查了学生的英语实际应用能力。根据要求应包含三个要点,内容可以适当扩充,增加一些细节。不要逐字翻译,机械照搬。参考范文Dear PeterWe haven t seen each other for a long time, so i want to invite you to my home next weekend. My home islocated at Zhongshan Road near the city library. You can take a bus in front of your school to get there.To have an interesting get-together. I will arrange some activities for us to enjoy, such as drinking Chinesetea and learning to make dumplings. In addition. watching some performances of Peking opera will also be agood choice.I have many things to talk with you. so I hope you can accept my invitation. I promise you will have a goodtime at my home. Please reply to me with your decision.Yours

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