2022英语周报七年级新目标红答案

4.【解析】本实验采用质壁分离的原理探究黑藻叶片细胞液的浓度.实验的自变量是蔗糖溶液的浓度,因变量是蓝色小滴升降情况;根据实验数据分析,黑藻叶片细胞的细胞液浓度介于0.15mo·L-和0.20mol·L-1之间;乙组试管1、2、3中蓝色小滴下降的原因是甲组12、3号试管中黑藻叶片的细胞液浓度大于蔗糖溶液浓度、细胞吸水,导致试管中蔗糖溶液浓度上升,蓝色小漓密度大于乙组相同编号试管內溶液的密度,由于甲组3号试管失水少,蔗糖溶液浓度变化小.故乙组3号试管中蓝色小滴下降速率最慢;乙组试管4、5、6屮藍色小滴均上升的原因是甲组4、5、6试管中黑藻叶片的细胞液浓度小于蔗糖溶液浓度.细胞失水,导致试管中蔗糖溶液浓度下降,蓝色小滴密度小于乙组相同编号试管内溶液的密度.甲组6号试管细胞失水最多,故6号试管中黑藻叶片细胞内叶绿体分布最密集。故选D。

第二节书面表达【写作指导】1.审题立意:本题要求就增设社团写一则征集意见启事而非表达自己对社团的想法,动笔前一定要看清题目要求和写作话题。2.构思谋篇:结合写作任务背景和所给任务要点,安排好内容和层次,铺设好各要点间的过渡,处理好开头和结尾。3.优化语言:词汇上可多使用形容词和短语,并适当使用多种亮点结构如非谓语动词短语、复合句和倒装句等。【佳作展台Your Opinions WantedTo help us develop wide interests as well as live a more colourful andelaxing campus life, our school intends to set up several new clubs ofextra-curricular activities. As everyone has their preference, we are hereto seek all your opinions so that the new clubs will satisfy you most. Youare expected to write down top three clubs you want and relative details inthe form which you can download on our school website. The form shouldbe sent to xhstudentunion 163. com by April 1 st. Every suggestion ischerished and just make your voice heard【亮点梳理】亮点词汇: intends, set up, preference, relativedetails, make your voice heard亮点句式:原因状语从句( As everyone has their preference),定语从句( which you can download on our school website)等。

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