英语周报 2018-2022 高二 课标 33答案

第二节(满分25分)One possible versionThen came the Rajasthan /v trip which was our official last trip I hanged out with my otherErieiends while she with the other two girls. I wasn,t enjoying this trip at all, which she could makeBout. When she saw me approaching the common washroom, she followed me in and shut thedoor. I didn 't know how to react. She gave me a tight hug and broke down. My tears were alsoout of control We knew we both wanted to be in each others company. We promised to growmature and let it not affect our friendshipaozIt's been almost 7 years after graduation since we picked up our friendship. Shes one of thefew people I really count on in my life. She's been with me through all my struggles, helping meconstantly to grow into a better individual. So have I. The only learning from our relationshipis-if someone is meant to be in your life, they will ensure they stay around some way or theher Willingness to keep a relationship should come from both the sides

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。

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