2023届江苏省徐州市高三考前打靶卷化学试题答案

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2023届江苏省徐州市高三考前打靶卷化学试题答案试卷答案，以下是该试卷的部分内容或者是答案亦或者啥也没有

8A【解析】n十了=1gn-g(n+1),所以由图可得,S=2+1g1-1g2+lg2-lg3++lgn-1g(n+1),则S=2-lg(n+1)=-1,解得n=999,因为此时需退出循环,所以结合选项,可填人n<999.故选A.

6.A【解析】根据题意,f(x)是定义域为R的奇函数,则f(-x)=-f(x),且f(0)=0,又由f(1-x)=f(1+x)得∫(x+2)=f(-x),则f(x+2)=-f(x),进而得到∫(x+4)=-f(x+2)=f(x),则f(x)为周期为4的函数所以由f(1)=2,可得f(3)=f(-1)=-f(1)=-2,又f(2)=f(0)=0,f(4)=f(0)=0),则f(1)+f(2)+f(3)+f(4)-2+0-2+0=0,则f(1)+f(2)+f(3)+…+f(99)=21×f(1)+f(2)+f(3)+f(4)]+f(1)+f(2)+f(3)=0.故选A

研究人员在海洋里发现了人造甜味剂一一三氯蔗糖种造甜味剂不会被人体吸收,也不会被污水处理厂清除,最终被排放到大自然里。久而久之,不断累积的三氯蔗糖对环境造成了不良影响32.D推断题。根据第2段第3、4、5句可知,污水处理厂不能很好地清除人造甜味剂。一项研究发现,水中至少98%的三氯蔗糖因未被处理厂的设备清除而排到了大自然中33.C推断题。根据第4段第1句可知,三氯蔗糖会让某些有硬壳的海洋动物游得比正常情况更快,也会让男一些海洋动物游得更慢。由此推知,三氯蔗糖会影响部分海洋动物的游动的速度。34B推断题。根据最后一段ValeriaDulio的话可知,三氯蔗糖的使用一直在增加,这表明它在环境中的含量也会增加。目前还不清楚海水中人造甜味剂的积累是否会间接影响人类,以及如何影响,也许会影响到我们吃的鱼及其他海鲜。由此可推知,她很担心三氯蔗糖的使用35C主旨题。本文主要介绍了海洋里的人造甜味剂一三氯蔗糖,它对动植物有不良影响

21.关键信息:①2020年3月8日晚卡塔尔乒乓球公开赛落幕;(1分)②樊振东、陈梦分获男女单打冠军;(1分)③国乒四冠一亚拿得惊险;(1分)④如何备战奥运尚待思考。(2分)【解析】这则材料所陈述的主体事件是“卡塔尔乒乓球公开赛落幕”,事件发生的时间是“2020年3月8日”,结果是“樊振东、陈梦分获男女单打冠军”“国乒获得四冠一亚”,补充说明是“赛事带来的思考”,然后根据题干要求,按照先后顺序整合信息即可

第四部分第二节Iwo davs before my birthday last vear. Dad came home earlv. As usual. Ihelped him carry his bags into his study: When I turned to leave. he said: "Hey. wouldyou like to help me clean my comb? It's been a while since I last cleaned"It hit methen why. as a child. helping my dad clean his comb was such a joy. That routinemeant that my dad was home early to spend the evening with Mum and I. It meantwould watch TV with us or play a few video games with me. It meant a happyloving familyI pass the clean comb back to Dad. I noticed the wrinkles next to his eyes.They are more noticeable when he smiles. but his smile is still as heartw arming asbefore. The smile of a father who just wants a good life for his family. Dad carefullyplaces his comb on top of his wallet. After so many years. he still organises hispersonal items in the same careful way. I guess some things never change. And forthat. I'm glad

L2,故B能达到实验目的;室温下,用pH试纸测得0.100ml·LCH2COOH溶液的pH约为3,0.100ml·LHCN溶液的pH约为5,说明 CH COOR的电离程度大于CN,能证明酸性HCN2023届江苏省徐州市高三考前打靶卷化学试题答案