九年级上册综合检测(二)
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人教版九年级上册自我综合评价(二)(391)1.图实验室常用的实验仪器与装置。
依据题目要求回答下列问题。
(1)写出标号仪器的名称:①;②。
(2)制取氧气有多种方法,如分解过氧化氢、加热高锰酸钾、等。
(3)采用分解过氧化氢制取氧气有许多优点,如(填序号)。
①产物无污染②不需加热③需加热④生成物只有氧气(4)甲同学用分解过氧化氢的方法制取氧气,应选择的气体发生装置为(从A~E中选,填字母,下同),收集装置为。
(5)乙同学选择装置A以高锰酸钾为原料制取氧气,该反应的文字表达式为,他在该装置试管内的导管口处添加了一小团棉花,其目的是。
(6)氧气收集完成后,测得其纯度明显偏低,原因可能是(填字母,可多选)。
A.高锰酸钾中混入了二氧化锰B.收集前,集气瓶中未注满水C.收集后,集气瓶中仍有少量水D.未见气泡连续均匀地冒出时就开始收集(7)将F和G装置连接,可以测量氧气的体积,氧气应从(填“a”或“b”)口通入。
2.在用氯酸钾和二氧化锰的混合物制取氧气实验后,为了进一步探究二氧化锰的用量对氯酸钾分解速率的影响,小明用如图所示的装置,以及实验室提供的实验所需药品和器材进行实验。
老师对实验的建议:①每组实验氯酸钾用量可取4g,二氧化锰质量不宜超过2g。
②实验应设计4组。
(1)结合老师建议,补充完整实验步骤①之后的其他步骤。
①检查装置的气密性;②取4g氯酸钾与0.5g二氧化锰,均匀混合后加入试管中,连接好装置;③;④换用三支相同的试管,各加入4g氯酸钾,分别与g、g、g二氧化锰均匀混合,用相同装置重复步骤②③;⑤。
(2)实验结束后,小明回收了二氧化锰。
如果要证明二氧化锰是氯酸钾分解的催化剂,还需验证二氧化锰的保持不变。
3.通过创建卫生城市活动,枣庄市空气状况有了明显改善,但测得目前空气的主要污染物仍是PM2.5,下列做法应该继续提倡的是①保护青山绿水②就地焚烧秸秆③发展共享单车④减少燃煤使用⑤燃放烟花爆竹()A.①③④B.①②④C.①②③④D.②③④⑤4.下列说法错误的是()A.通过实验能证明空气是由至少两种成分组成的混合物B.氮气能用作食品保鲜的保护气,说明氮气不易与食品发生化学反应C.工厂排放到空气中的废气和烟尘会污染空气D.空气质量日报中所列的空气质量级别数目越大,空气的质量越好5.下列有关催化剂的说法正确的是()A.在化学反应后其质量减少B.催化剂能改变化学反应速率C.在化学反应后其质量增加D.在化学反应后其化学性质发生了变化6.下列有关燃烧的实验现象描述正确的是()A.硫在氧气中燃烧发出淡蓝色火焰B.铁在氧气中剧烈燃烧,火星四射,生成黑色固体,放热C.红磷燃烧产生大量白雾D.木炭在空气中燃烧产生火焰,不放热7.如图是用燃磷法测定“空气中氧气含量”的实验,下列说法正确的是()A.装置中的红磷可以用铁丝来代替B.待红磷熄灭并冷却后,打开弹簧夹,再观察现象C.红磷在空气中燃烧产生大量的白雾D.实验测定氧气的质量约占空气总质量的158.化学概念间有包含、并列、交叉等不同关系。
期末综合测试题(二)时间:45分钟满分:100分一、单项选择题(每小题3分,共30分)1.关于分子,下列说法中正确的是(D)A.红墨水在水中散开说明分子间有斥力B.吸盘能牢牢吸在玻璃上,说明分子间存在引力C.尘土飞扬,说明分子在不停地运动D.糖在热水中溶解得快,说明温度越高,分子的热运动越剧烈2.下列说法正确的是( D )A.“破镜不能重圆”说明分子间没有引力B.发生热传递时,热量总是从内能大的物体向内能小的物体传递C.把0 ℃的冰块加热熔化成0 ℃的水,若不考虑水的蒸发,其内能不变D.若没有外界做功时,同一物体温度降低得越多,放出的热量就越多3.下列关于四冲程内燃机的说法中正确的是(C)A.热机效率越高,所做的有用功就越多B.汽油机在吸气冲程中吸入汽缸的是空气C.一个工作循环对外做功一次D.压缩冲程中将内能转化为机械能4.“天宫一号”圆满完成预定任务后返回地球。
8.5 t重的“天宫一号”在100 km左右的高空以约22倍音速飞入大气层。
其中部分器件在大气层中与大气层摩擦烧蚀销毁,最后大约1.5 t残骸坠入南太平洋。
在这个过程中,“天宫一号”的部分机械能(C)A.通过热传递转化为大气的内能B.通过重力做功转化为大气的内能C.通过摩擦做功转化为大气的内能D.通过重力做功转化为残骸的内能5.甲、乙两个轻质泡沫小球用绝缘细线悬挂起来,它们之间的相互作用情况如图所示。
下列有关两球带电情况说法正确的是(D)A.两球都带正电B.两球都带负电C.若甲带正电,则乙一定带负电D.若甲带负电,则乙可能不带电6.如何在外部检测植物含水量的变化呢?科学家用条状石墨烯制成的湿敏电阻R x,附着在叶片上,植物含水量变低,R x变小,电表示数变小;植物含水量变高,R x变大,电表示数变大。
电源电压恒定,R0为定值电阻,下列电路图中符合要求的是(C)A B CD7.如图所示,闭合开关后两灯不亮,用电压表先后测得U AD=U AC=U AB=4.5 V,则故障可能是(A)A.灯L1发生断路B.灯L2发生断路C.灯L1发生短路D.灯L2发生短路第7题图第8题图第10题图8.如图所示的电路中,电源电压恒定,L为小灯泡,滑动变阻器R的滑片P处于中点,通过控制开关S1、S2和S3的通断来研究电路的常见故障与串、并联,通过调节滑动变阻器来分析电路中电流的变化情况,则( D )A.闭合S3,断开S1、S2,R被短路B.闭合S1,断开S2、S3,L与R串联C.闭合S2,断开S1、S3,L与R并联D.闭合S2,断开S1、S3,滑片P向右移动,电流表的示数变小9.物理课代表为全班同学设计了如下四个电路图,图中电源电压未知但不变,R0为阻值已知的定值电阻,R1为最大阻值已知的滑动变阻器,通过断开、闭合开关或调节R1接入电路阻值不能测出未知电阻R x阻值的电路是( A )10.如图甲所示,电源电压保持不变,闭合开关S,滑动变阻器的滑片P从b端滑到a 端,电压表示数U与电流表示数I的变化关系如图乙所示,下列说法不正确的是(C) A.电源电压是9 VB.定值电阻R的阻值是6 ΩC.滑动变阻器的阻值范围是0~18 ΩD.若定值电阻R出现接触不良时,电流表示数为0,电压表示数为9 V二、填空题(每空1分,共21分)11.刚装修完的房子,打开房门就会闻到刺鼻的气味,这是分子不停地做无规则运动的结果。
人教版九年级物理上册第十九章综合素质评价一、选择题(每题3分,共9分)1.[教材改编题]下列四种做法中符合安全用电原则的是()A.用湿手按开关B.在高压线下放风筝C.用试电笔辨别火线、零线D.双手分别接触火线、零线2.由于保险丝更换麻烦,家庭中常用断路器保护电路,当电流过大时可以自动切断电路,如图甲、乙所示为断路器工作原理,下列说法错误的是()A.该断路器应安装在进户线的火线上B.双层金属片是用不同材料金属制成的C.该断路器“跳闸”一定是出现了短路D.当电路断开后,双层金属片逐渐冷却复原3.小明在爸爸帮助下,尝试连接如图所示的部分家庭照明电路,为判断电路中是否有故障,他将保险丝换接成一只“220 V40 W”的灯L0,闭合总开关后,小明将开关S1、S2均闭合,下列关于电路故障判断说法正确的是()A.灯L1不亮,灯L0、L2发出暗红色光,则灯L1一定短路B.灯L1、L2均不亮,灯L0正常发光,则灯L1一定短路C.灯L1不亮,灯L0、L2发出暗红色光,则灯L1一定断路D.灯L0、L1、L2均发出暗红色光,则说明电路中一定存在接触不良二、填空题(每空1分,共12分)4.[立德树人·安全意识]家庭电路中触电的原因:一是站在地上的人接触到________(单线触电),二是站在绝缘体上的人同时接触到________和________(双线触电)。
5.[2022·宁夏改编]如图所示的家庭电路,开关闭合后发现灯泡不亮,于是某同学利用试电笔分别接触a、b、c、d四处时,试电笔氖管均发光,则故障原因可能是________________。
排除故障后,为提高屋内亮度,于是又接了一盏同样的灯,开关闭合后,两灯都发光,原来的灯泡亮度明显变暗,由此可判断两灯的连接方式是________。
电工师傅在检修电路时,首先断开总开关,然后短接插头,插入插座中,这样其他人不知道电工师傅正在检修电路,误闭合________(填“总开关”或“用电器开关”)时,空气开关或漏电保护器自动断开电路,保障电工的人身安全。
期末素养综合测试(二)满分120分,限时120分钟一、积累(30分)(2022湖北黄石初中教研协作体期末)阅读下面的文字,完成1—5题。
(10分) “飞天梦永不失重,科学梦张力无限……”当“太空教师”王亚平再度说出这句话,一堂()的太空授课画上了圆满的句号。
其实,“天宫课堂”的教学场地——空间站本身就是引人入胜的人造宇宙景观。
①最前沿的科技产品,它代表了中国人()宇宙所抵达的最远边界。
空间站里独特的工作生活场景和物理学现象提醒人们,其后还有一个更为广袤.的未知世界。
一堂约60分钟的太空科普课,②背后的科技支撑十分复杂,凝聚了几代航天人孜.孜不倦的努力。
更不必说,高难度高风险的出舱shì chá已成为中国航天员的“必备技能”,他们像搭积木一般搭建起美感十足的T字型中国空间站。
人类对科技的探索不会tíng zhì bù qián。
以更直观、更生动的方式让公众和前沿科技“相遇”,会进一步③激发科学对人们的兴趣,④增强自身的科学素养,使蕴藏在亿万人民中间的创新智慧充分释放,助力创新型国家建设。
(摘编自余建斌《“天宫课堂”,“宇宙级”的知识浪漫带来了什么?》)1.下列依次对文中加点的两个字的注音,完全正确的一项是(2分)()A.mào zīB.mào zhīC.máo zīD.máo zhī答案A注意方言和习惯性误读。
2.下列对文中两处拼音对应的词语的书写,完全正确的一项是(2分)()A.视查停置不前B.视察停滞不前C.视查停滞不前D.视察停置不前答案B注意同音字误写。
3.下列依次填入文中括号处的词语,最符合语境的一项是(2分)()A.叹为观止游览B.别开生面游览C.别开生面漫游D.叹为观止漫游答案C“别开生面”比喻另外开创新的局面或新的形式。
“漫游”指任意游赏。
4.下列对文中①②③④处语句的修改正确且符合语境的一项是(2分)()A.①处修改为“作为最前沿的科技产品”。
统编版语文九年级上册期末综合评价卷(二)原卷版(时间:120分钟分数:120分)第一部分(1—4题20分)1.阅读下面的文字,回答后面的问题。
(6分)读书的目的绝不是附庸..风雅,更不是炫耀。
读书可以增智广才,可以励志修德,可以怡情养性,是最好的养心之道。
读书的作用是(不言而喻/不攻自破)的,所以真正的读书人会沉浸在书海里,(孜孜以求/持之以恒),乐此不疲。
读《诗经》,让心灵在纯真无邪的原野上奔腾;读《红楼梦》,任自己的心情时而惊喜,时而惘然..,时而悲伤;读《三国演义》,让自己的灵魂穿梭在jīn gē tiě m ǎ的冲突里,停留在jīng shì qí cái的谈论间……读书的愉悦是发自内心、出于精神层面的乐趣,是充实持久、不可替代的快乐。
(1)给文段中加点的词语注音。
(2分)①附庸..( )..( ) ②惘然(2)根据拼音写出汉字。
(2分)①jīn gē tiě mǎ( ) ②jīng shì qí cái( )(3)从文中括号内选择恰当的词语写在下面横线上。
(2分)2.请按提示填写表格横线处的内容。
(每空1分,6分)3.下列说法完全正确的一项是(2分)( )A.“千里共婵娟”中的“婵娟”指月亮。
月亮的别称还有玉兔、嫦娥、金乌和羲和等。
B.谪,封建王朝官吏降职或远调。
如“滕子京谪守巴陵郡”即滕子京被贬官到岳州做知州。
C.欧阳修被贬为滁州知州,自号“醉翁”,寄情于山水,写出了传诵千古的文章《醉翁亭记》。
文中展现了琅琊山的美景,并按时间顺序记叙了滁人游、太守宴、禽鸟乐、太守醉,体现了“与民同乐”的思想。
D.《我的叔叔于勒》作者是法国作家莫泊桑,其代表作有《羊脂球》《悲惨世界》等,他与俄国的契诃夫和美国的欧·亨利并称为“世界三大短篇小说巨匠”。
4.对联是汉语独特的艺术形式,是我国优秀传统文化的瑰宝。
你所在班级开展“寻找最美对联”的语文实践活动,一位同学抄录了一副对联:风调雨顺年年丰稔,国泰民安岁岁祥和。
人教版九年级英语上册Unit 4 综合素质评价限时: 60分钟满分: 100分一、单项选择(每小题1. 5 分, 共15 分)1. [2023·重庆二外期中]Tim _______ lots of computer games, but now he workshard for his dream.A. used to playingB. is used to playC. is used to playingD. used to play2. Jane is very busy these days, for she has a lot of problems to _______.A. deal withB. keep up withC. agree withD. come up with3. [2022·福建改编]—China won third place in the men’s 100-meter relay race at the2020 Tokyo Olympics.—Wonderful! We _______ the athletes.A. are proud ofB. are friendly toC. are strict withD. are interested in4. In order to protect his eyes, he _______ uses electronic products.A. alwaysB. oftenC. usuallyD. seldom5. [2023·成都第七中学月考] While watching the film yesterday, I couldn’t stoplaughing at some _______ moments.A. humorousB. challengingC. dangerousD. surprising6. She is _______ girl from Asia.A. a 18-year-oldB. an 18-year-oldC. an 18-years-oldD. a 18-years-old7. The flowers ______ some water because they haven’t been watered for many days.A. getB. refuseC. askD. require8. —I studied hard, but I still _______ the exam.—Don’t give up. I believe you will pass next time.A. failedB. worriedC. improvedD. succeeded9. The year of 2022 was a hard time for my friend Lin Mei, but she didn’t ________hope.A. pick upB. use upC. put upD. give up10. It _______ two months since I _______ my hometown.A. was; leaveB. was; leftC. has been; leaveD. has been; left二、[2023·石家庄二十八中月考改编]完形填空(每小题1 分, 共15 分)A few weeks ago, a friend wrote to me. He 11. _______ hopeless at the time. He ended his letter by asking his question “We can’t really change this world we 12._______, can we?”I replied to him and started my own letter with these words, “Yes, we most certainly can!”I can still remember someone who 13. _______ my world. She was the music teacher at my elementary school. She was good at playing 14. _______ guitar. However, I didn’t know 15. _______ to play any instruments.One day, she let me try playing her guitar. I did my 16. _______, but I could not do it well. I laid my head down and felt 17. _______. “I guess I am not very good at it,” I told her. She 18. _______ me with her kind eyes, 19. _______ at me and said, “We are all good at something. You need to find out 20. _______ you are good at. Then you can share 21. _______ with the world.”These simple words changed me. They planted a seed in my mind that continues to 22. _______ to today. They made me realize that I had 23. _______ good inside me.I 24. _______ had to find it and share it.Can you change the world? Yes, you can! You can change it through one choice, one person and one kind act at a time. To share your 25._______ is all you have to do.11. A. liked B. felt C. made D. tried12. A. arrive in B. go to C. live in D. arrive at13. A. wished B. hoped C. changed D. helped14. A. the B. a C. an D. /15. A. who B. what C. which D. how16. A. best B. better C. worse D. worst17. A. good B. happy C. relaxing D. upset18. A. looked at B. looked forC. looked upD. looked through19. A. stared B. smiled C. shouted D. laughed20. A. what B. that C. when D. where21. A. he B. they C. she D. it22. A. get B. grow C. feel D. plant23. A. nothing B. anything C. something D. everything24. A. although B. still C. just D. too25. A. wealth B. feeling C. politeness D. kindness三、阅读理解(每小题3 分, 共15 分)The study points out that parents can take some key steps to raise children well. So, the parent-child relation is very important.Parents bring warmth to children’s lives. They usually shower kids with talk and touch. As a child grows older, he finds warmth in the parent-child relation in other ways. Warmth can lead children to do very well in all the fields.In fact, parents are the children’s examples. They can teach children not to depend on parents or others. They are also very strict with children. That’s to say, children must do as parents tell them. Setting limits (限制) can help children focus (集中) on the work. For example, limiting television time can help them finish homework on time.From early childhood, the home becomes a school. And the dinner table might become the desk after dinner. Parents will educate their children much if the parent-child relation is strong. For example, reading books to them will improve their language skill, playing games with them will improve their action skill and finishing puzzles with them will improve their cognitive (认知的) skill.Mom and Dad play different roles in children’s lives. Moms are their life teachers. They teach children not to be afraid of new environments. They also spend time on simple and funny activities with children. Dads are their growing teachers. Experts think fathers play an important role in children’s feelings and development. Father-child relation always helps children learn to express and control their feelings.26. What can warmth lead the children to do?A. Become too fat.B. Play games.C. Be good at sports.D. Have lots of books.27. Why must children do as parents tell them?A. Because parents are strict.B. Because parents are right.C. Because parents love them.D. Because they depend on parents.28. What does playing games with children improve?A. Children’s language skill.B. Children’s communication skill.C. Children’s cognitive skill.D. Children’s action skill.29. What can a mom do with the children?A. Teach children to express their feelings.B. Teach children to control their feelings.C. Make a difference to their development.D. Join in the easy and funny activities.30. Which of the following is TRUE according to the passage?A. In children’s life, parent-child relation is very important.B. Limiting television time can help children keep healthy.C. All the family members are the children’s teachers.D. Father-child relation can help children grow strong.四、词汇运用(每小题2 分, 共10 分)根据句意及汉语或首字母提示写单词。
Unit 2 综合素质评价限时: 100分钟满分: 100分一、单项选择(共15 小题;每小题1 分,满分15 分)从A、B、C、D 四个选项中,选出可以填入空白处的最佳选项。
( )1. I prefer ______ in the classroom to ______ outside.A. to read; runningB. reading; to runC. reading ; runningD. to read; run( )2. —Should I be stricter (严格的) with myself at school, Mr. Green?—I think so, ______ you will fall behind others.A. andB. butC. orD. so( )3. Are you sure ______ this English dictionary is of great help to me?A. thatB. whatC. whoD. why ( )4. Trust is always an important part of any healthy ______.A. situationB. suggestionC. advantageD. relationship ( )5. People felt a little worried because they didn’t know ______ the typhoon (台风) called Meihua would come or not.A. whenB. whetherC. thatD. where ( )6. —Purple doesn’t look good ______ you, but you look cool ______ black.—Really? Let me try.A. on; onB. in; inC. on; inD. in; on ( )7. [2024 南京鼓楼实验中学10 月月考] The old photos ______ them ______ the old days when they were young.A. let; toB. make; forC. take; ofD. remind; of ( )8. It’s hot today. Jenny suggested ______ out for a walk, but I’d rather stay at home.A. goB. goesC. goingD. to go ( )9. —Little Jenny looks unhappy today.—Don’t worry. A box of chocolates will ______ her ______.A. give; upB. wake; upC. cheer; upD. pick; up( )10. [2023 扬州改编] I have been in China for three months and this is the first time I’ve ______ hanfu.A. kept onB. got onC. taken onD. tried on ( )11. [2024 江阴陆桥中学10 月月考] Learning a foreign language ______ time and hard work. There is no shortcut.A. requiresB. remembersC. repeatsD. reminds ( )12. —Hi, Peter. Will you go to Lily’s party with me?—I’m not sure if Lily ______ me. If I ______, I’ll go with you.A. will invite; will be invitedB. will invite; am invitedC. invite; will inviteD. invites; invite( )13. [2023 泰州靖江靖城中学校际联盟联考] Most women ______ go shopping ______ watch sports.A. prefer; toB. like; better thanC. would rather; toD. would rather; than( )14. —I think that saving the earth begins with little things.—______. All those little things will add up to be great.A. That’s rightB. You’re welcomeC. I’m not sure about thatD. I’m afraid I can’t agree( )15. —With the red skirt on her, Jane looks prettier.—Yes. I’m a little ______. I wish I were as pretty as her.A. green with envyB. blue in the faceC. in the pinkD. black and blue二、[2023 盐城滨海滨淮初中教育集团检测] 完形填空(共15 小题;每小题1 分,满分15 分)阅读下面短文,从短文后每题所给的A、B、C、D 四个选项中,选出可以填入空白处的最佳选项。
沪教版九年级上册数学全册综合检测二1.tan60°的值等于()A.1B C D.22.下列各数中是有理数的是()A.√33B.4πC.sin45°D.1cos60°3.若两个相似三角形的周长之比是1:2,则它们的面积之比是()A.1:2B.1:C.2:1D.1:44.如图所示的测量旗杆的方法,已知AB是标杆,BC表示AB在太阳光下的影子, 叙述错误的是()A.可以利用在同一时刻,不同物体与其影长的比相等来计算旗杆的高B.只需测量出标杆和旗杆的影长就可计算出旗杆的高C.可以利用 ABC EDB,来计算旗杆的高D.需要测量出AB、BC和DB的长,才能计算出旗杆的高5.如图所示,数学小组发现8米高旗杆DE的影子EF落在了包含一圆弧型小桥在内的路上,于是他们开展了测算小桥所在圆的半径的活动.小刚身高1.6米,测得其影长为2.4米,同时测得EG的长为3米,HF的长为1米,测得小桥拱高(弧GH的中点到弦GH的距离,即MN的长)为2米,则小桥所在圆的半径为(A .5 2B .5C .D .66.等腰ABC 的底角是30,底边长为ABC 的周长为( )A . 4+B .6C .D .1?7.比较tan20°,tan50°,tan70°的大小,下列不等式正确的是( ) A .tan70°<tan50°<tan20°B .tan50°<tan20°<tan70°C .tan20°<tan50°<tan70°D .tan20°<tan70°<tan50°8.用计算器sin 20tan5433︒︒'+求的结果等于(结果精确到0.01)( )A .2.25B .1.55C .1.73D .1.759.图中的两个三角形是位似图形,它们的位似中心是( )A .点PB .点DC .点MD .点N10.如图,D 为 ABC 的边AB 上的一点, DCA = B ,若AC cm ,AB =3 cm ,则AD 的长为 ( )A .32cmB .53cmC .2 cmD .52cm 11.已知△ABC 和△A ′B ′C ′是位似图形.△A ′B ′C ′的面积为6 cm 2,△A ′B ′C ′的周长是△ABC 的周长一半.则△ABC 的面积等于( )A .24 cm 2B .12 cm 2C .6 cm 2D .3 cm 212.下列四条线段为成比例线段的是 ( )A .a =10,b =5,c =4,d =7B .a =1,b c ,dC .a =8,b =5,c =4,d =3D .a =9,b ,c =3,d13.若 a b = c d = e f =3(b+d+f≠0),则 22a c e b d f -+-+=________. 14.如图,在 ABC 中,D 、E 分别是AB 、AC 上的点,且DE BC ,若AD :AB=4:9,则S △ADE :S △ABC = .15.如图,已知矩形OABC 与矩形ODEF 是位似图形,P 是位似中心,若点B 的坐标为()2,4,点E 的坐标为()1,2-,则点P 的坐标为______.16.如图,在△ABC 中,DE ∥BC DE 与边AB 相交于点D ,与边AC 相交于点E ,如果AD=3 BD=4 AE=2,那么AC=________17.从下面两题中只选做一题,如果做了两题的,只按第(1)题评分: (1)用“=>”与“<=”表示一种运算法则:(a=>b )=﹣b ,(a <=b )=﹣a ,如(2=>3)=﹣3,则(2010=>2011)<=(2009=>2008)=________ (括号运算优先) (2)用“>”或“<”号填空:sin40°cos50°﹣12________ 0.(可用计算器计算) 18.如图,在△ABC 中,∠C=90° AB=5 BC=3,则cosA 的值是________19.如图所示,AB∥CD∥EF,AC与BD相交于点E,若CE=4,CF=3,AE=BC,则CD AB的值是_____.20.两个三角形相似,其中一个三角形的两个内角是40°、60°.那么另一个三角形的最大角是________度,最小角是________度.21.如图,已知AB∥CD∥EF,AD:AF=3:5,BE=10,那么BC的长等于________.22.长为4m的梯子搭在墙上与地面成45︒角,作业时调整为60︒角(如图所示),则梯子的顶端沿墙面升高了______m.23.人写字时眼睛和笔端的距离超过30cm时则符合保护视力的要求,图1是一位同学的坐姿,把她的眼睛B、肘关节C和笔端A的位置关系抽象成图2的 ABC,BC=30cm,AC=22cm, ACB=530,她的这种坐姿符合保护视力的要求吗.请说明理由.(参考数据:sin530≈0.8,cos530≈0.6,tan530≈1.3)24.如图所示,某办公大楼正前方有一根高度是15米的旗杆ED,从办公楼顶端A测得旗杆顶端E的俯角α是45°,旗杆底端D到大楼前梯坎底边的距离DC是20米,梯坎坡长BC是12米,梯坎坡度i=1,求大楼AB的高度是多少?(精确到0.1≈1.41≈1.73≈2.45)25.如图,线段AB CD分别表示甲乙两建筑物的高,BA⊥AD CD⊥DA,垂足分别为A D.从D点测到B点的仰角α为60°,从C点测得B点的仰角β为30°,甲建筑物的高AB=30米1)求甲、乙两建筑物之间的距离AD2)求乙建筑物的高CD26.如图,自来水厂A和村庄B在小河l的两侧,现要在A,B间铺设一知输水管道.为了搞好工程预算,需测算出A,B间的距离.一小船在点P处测得A在正北方向,B位于南偏东24.5°方向,前行1200m,到达点Q处,测得A位于北偏东49°方向,B位于南偏西41°方向.(1)线段BQ与PQ是否相等?请说明理由;(2)求A,B间的距离.(参考数据cos41°=0.75)。
Unit2 综合测试卷一、单项选择1.My grandmother bought vegetables in the market because she planted many vegetables in her garden.A.often B.always C.usually D.hardly 2.—Why did Tan become interested in the sounds of nature?—__________ he thinks the best music comes from nature.A.Since B.As C.Because D.For3.I write down new words, but I forget them ________. How can I remember them? A.clearly B.probably C.quietly D.quickly 4.—I want to have a day ________ in Wuhan.—It’s really a beautiful city.A.term B.time C.trip D.party 5.Sorry, I ________ a mistake. Let me correct it.A.will make B.am making C.was making D.have made 6.--It's 20 years since we came back to Liangshan.--How time flies! We ___________ in our hometown for such a long time.A.work B.worked C.has worked D.have worked 7.A number of tourists ________ Yangzhou many times because it is such a beautiful city. A.have been to B.has been to C.has gone to D.have gone to 8.What ________ unusual school trip we had! I will never forget it.A.a B.an C.the D./9.— What is the Trip Code (行程码) used for?— It’s used to show where you ________ in the last 14 days.A.were B.will be C.have been D.had been 10.They have been friends ________ they first met.A.since B.while C.before D.after 11.How many Chinese astronauts ________ into space since 2003?A.were sent B.sent C.have been sent D.have sent 12.—How is your reading project?—I ________ most of the books we are supposed to read since September.A.have read B.read C.will read D.am reading 13.Zhang Dingyu, the President of Wuhan Jinyintan Hospital, has great ______ to face the difficulties though he suffers from ALS (渐冻症).A.characters B.disadvantages C.humors D.courage 14.Her grandmother ________ in 1985. She ________ for 23 years.A.died; died B.dead; died C.died; has been dead D.dead; has died 15.—Have you seen Dr Adams recently?—No. He _________ Hong Kong for an international meeting.A.has gone in B.has been in C.has gone to D.has been to 16.Don’t keep up with him—he runs ________ than me.A.much faster B.even worse C.less carefully D.more carefully 17.It’s nice to see you again. We ________ each other since 2016.A.won’t see B.haven’t seen C.don’t see D.didn’t see 18.—Where have you been? The film ________ for half an hour.—Oh, sorry. I’m late because of the heavy rain.A.started B.has been on C.has started D.has begun19.Lu Xun ________ for over eighty years, but his works still have a great influence today. A.died B.was dying C.has died D.has been dead 20.He made a lot of money and became very________.A.poor B.weakC.rapid D.wealthy二、语法选择In my life, my grandmother’s house is a very important place to me. She lives in a small village ____21____ the south of the country. I ____22____ there every summer, to visit my grandmother, get away from the city and relax.The village ____23____ lives in is just a group of white house on a hillside with some shops, and it’s really peaceful.One reason why I like it is ____24____ it’s a beautiful place. My grandmother has a lovely garden and we always sit under the trees, drinking sweet tea and chatting. It’s so ____25____ to enjoy time there. But ____26____ main reason why this place is so important to me is my grandmother. She is so kind to me, and wonderful to talk to. ____27____, she is a great cook. Every meal ____28____ she prepares is simple but fresh and rich. No, no, I mean tasty. And always I ____29____ small plates of food during the day, so I always return home feeling fat and refreshed!I wouldn’t like to live there, though. I prefer ____30____ in a busy, exciting city. I’m a city person. I couldn’t live in a small village where everybody knows each other. However, I really love visiting the village for holiday.21.A.on B.at C.by D.in22.A.went B.go C.will go D.have gone 23.A.her B.hers C.she D.herself 24.A.where B.as C.when D.because 25.A.pleased B.pleasingly C.pleasure D.pleasant 26.A.the B.a C./D.an27.A.Too B.Also C.As well D.Either 28.A.that B.which C.who D.whether 29.A.am giving B.was giving C.am given D.was given 30.A.to live B.lived C.live D.lives三、阅读单选Big Issue Produced by PupilsBig Issue has launched (发行) a special 24-page edition (版本)created by school children recently. Big Issue is a weekly magazine launched in 1991 to help homeless people. Pupils in 13 schools across the country have started selling the special edition and will give the money they raise to charities._________________The Richardson Primary School has created a classroom in a train carriage (车厢), marking 300 years since it was opened. The SON EXPRESS carriage, which is no longer moving, includes a library, a place to eat, and another learning space. The carriage will help the school to teach STEM subjects (science, technology, engineering and math). Students describe it as “magical”. Celebrating the Daily MileOn 28 April, the Daily Mile had its 10th birthday. It’s a global (全球的) movement designed to get children exercising every day. To mark the event, more than 320,000 students from 1,340 schools around the world completed a mile. One kid said, “Running a mile every day with my friends builds up my fitness.”31.In which section of the newspaper can we read the news?A.PICTURE THIS!B.SPORTS DESK.C.HI! KIDS!D.MOVIE MAGIC.32.It’s clear that the special edition of Big Issue ________.A.is over 30 years old B.is created by children from 13 schools C.is launched monthly D.is sold to raise money by pupils 33.What would be the best heading for the second piece of news?A.Here Comes a “Classroom”B.The “Magical” RichardsonC.STEM Subjects Count D.The 300th Birthday Celebration34.The students describe the train carriage as “magical” mainly because ________.A.the carriage isn’t moving B.there are three classrooms in itC.they like STEM class D.they can read, eat and learn there35.To celebrate the 10th Daily Mile, ________.A.a global competition was held B.320,000 students got togetherC.many kids ran a mile that day D.1,340 schools stopped lessons(二)Most of us probably live without vegetables, but a world without chocolate? Now that would be hard! According to chocolate makers it could happen if we don’t act soon.。
RJB 9年级语文(上)单元学业质量评价(4)第二单元学业质量评价时间:120分钟满分:120分题号三-四总分评卷人得分一、积累与运用。
(30分)l .下列加点的字的读音有错误的一项是() (2分)A.禅师C ch6n )赦免(s 院)瞥见(p面B.劫掠(陲)汲取(j f)恪守C ke )C.濡养(XU )射塌(td n )积攒(cu6n )D.旁赘(wu )宽有(you)侚倭C l 6u )2.下列加点的词语使用不当的一项是()(2分)A.经验告诉我们:勤奋努力是一个人成功成才的不二法门。
....B.百鸟节上,百灵、黄鹏等鸟中的歌唱家一展歌喉,强晤不舍。
.... C.但必先有业,才有可敬、可乐的主体,理至易明。
D.有些人有一种错觉,似乎优雅风度就是矫揉造作。
....3.下列句子的标点符号使用正确的一项是() (2分)A.我生平最受用的有两句话:一是"责任心“,二是"趣味”。
B.艺术有两个起源,一是理想,理想产生欧洲艺术,一是幻想,幻想产生东方艺术。
C.我不晓得一下子就找对了行业的人,能占多大比例!从大多数人谈到工作时乏味麻木的表情推算,估计这样的幸运儿不多。
D.“做工好苦呀!”这种叹气的声音。
无论何人都会常在口边流露出来。
4.“地铁是城市的永动机,读书是颜值的保鲜器”“体肥还须少吃饭,想美就要多读书”“壮士腰间三尺剑,大咖腹中五车书"……郑州地铁上一组劝人读书的俏皮标语火了,甚至登上了新浪微博的热搜榜,引起广大网友的围观和讨论。
下列网友的留言,表达不够得体的一条是() (3分)A.谁说标语一定要板起脸来说道理?网络语言简洁时髦,轻松诙谐,宣传效果很赞!B.标语形式工整如对联,读起来押韵上口,给人留下深刻印象。
郑州地铁标语真是良心广告!C.作为阅读标语,说的比唱的好听没有用。
你也不想想,看过标语后,大家还不都一笑置之?D.这些写标语的人,看来是读过不少书。
5.下列说法有误的一项是() (3分)A.《论教养》的作者是苏联作家利哈乔夫。
人教版九年级英语上册Unit 4 综合素质评价限时: 90分钟满分: 120分一、听说应用(本大题共30 小题, 每小题1 分, 共30 分; A、B、C、D 部分为听力理解, E 部分为情景对话)A. 听句子(本题共5 小题, 每小题1 分, 共5 分)( ) 1. What did Dick use to be afraid of?A. B. C.( ) 2. What did she use to be?A. B. C.( ) 3. Why is Lucy absent today?A. B. C.( ) 4. Who does Jim live with now?A. B. C.( ) 5. Which country did Mary use to stay in?A. B. C.B. 听对话(本题共10 小题, 每小题1 分, 共10 分)听第一段对话, 回答第6 小题。
( ) 6. What’s t he relationship between the two speakers?A. Old classmates.B. Old neighbors.C. Teacher and student.听第二段对话, 回答第7 小题。
( ) 7. What will the man buy?A. Cakes.B. Ice-cream.C. Chocolate. 听第三段对话, 回答第8 小题。
( ) 8. What did Cindy use to look like?A. She used to be short.B. She used to wear glasses.C. She used to have long hair.听第四段对话, 回答第9 小题。
( ) 9. What sport does the man play now?A. Soccer.B. Ping-pong.C. Basketball. 听第五段对话, 回答第10 小题。
第二章综合测试一、选择题(共10题;共30分)1.已知关于x 的一元二次方程250x x m +-=的一个根是2,则另一个根是( )A .7-B .7C .3D .3-2.已知1x ,2x 是一元二次方程220x x -=的两根,则12x x +的值是( )A .0B .2C .2-D .43.一元二次方程22630x x ++=经过配方后可变形为( )A .2(3)6x +=B .()2312x -= C .23324x ⎛⎫+= ⎪⎝⎭ D .231524x ⎛⎫-= ⎪⎝⎭ 4.一元二次方程220x x +=的解是( )A .0x =B .2x =-C .1220x x ==D .1220x x =-=5.若方程2680x x -+=的两根分别是等腰三角形的底和腰,则这个三角形的周长为( )A .10B .8C .10或8D .10或146.一个正方形的边长增加了2 cm ,面积相应增加了232 cm ,则原正方形的边长为( )A .5 cmB .6 cmC .7 cmD .8 cm7.某种植物的主干长出若干数目的支干,每个支干又长出同样数目的小分支,主干、支干和小分支的总数是13,则每个支干长出( )A .2根小分支B .3根小分支C .4根小分支D .5根小分支8.如图,在长为100 m ,宽为80 m 的矩形场地上修建两条宽度相等且互相垂直的道路,剩余部分进行绿化,要使绿化面积为27 644 m ,则道路的宽应为多少米?设道路的宽为 m x ,则可列方程为( )A .10080100807 644x x ⨯--=B .()()2100807 644x x x --+=C .()()100807 644x x --=D .2100807 644x x x +-=9.关于x 的一元二次方程2410kx x -+=有实数根,则k 的取值范围是( )A .4k -≥B .4k -≥且0k ≠C .4k ≤D .4k ≤且0k ≠10.某农户种植花生,原来种植的花生亩产量为200千克,出油率为50%(即每100千克花生可加工成花生油50千克).现在种植新品种花生后,每亩收获的花生可加工成花生油132千克,其中花生出油率的增长率是亩产量的增长率的12.则新品种花生亩产量的增长率为( ) A .20%B .30%C .50%D .120% 二、填空题(共6题;共18分)11.已知1x =是关于x 的一元二次方程()221--10k x k x +=的根,则常数k 的值为________.12.当x =________时,代数式2x x -与1x -的值相等.13.设m 、n 是方程2 2 0210x x +-=的两个实数根,则²2m m n ++的值为________.14.关于x 的一元二次方程()22210a x x --+=有两个不相等的实数根,则整数a 的最小值是________.15.如图,已知AB BC ⊥,12 cm AB =,8 cm BC =.一动点N 从C 点出发沿CB 方向以1 cm/s 的速度向B 点运动,同时另一动点M 由点A 沿AB 方向以2 cm/s 的速度也向B 点运动,其中一点到达B 点时另一点也随之停止,当MNB △的面积为224 cm 时运动的时间t 为________秒.16.一元二次方程2680x x -+=的根为菱形的两条对角线长,则菱形的周长为________.三、解答题(共7题;共52分)17.解方程:(1)()224x +=(自选方法)(2)2210x x --=(配方法)(3)²14x x -=(公式法)(4)²122x x -=+(因式分解法)18.已知关于x 的一元二次方程2240x x m ++-=有两个实数根.(1)求m 的取值范围;(2)写出一个满足条件的m 的值,并求出此时方程的根.19.熊组长准备为我们年级投资1万元围一个矩形的运动场地(如图),其中一边靠墙,另外三边选用不同材料建造且三边的总长为50 m,墙长24 m,平行于墙的边的费用为200元/m,垂直于墙的边的费用150x.元/m,设平行于墙的边长为/m300 m,求x的值;(1)若运动场地面积为2(2)当运动场地的面积最大时是否会超过了预算?20.某商场销售一批名牌衬衫,平均每天可销售20件,每件盈利40元.为了扩大销售,增加盈利,尽量减少库存,商场决定采取适当的降价措施.经调查发现,如果每件衬衫每降价5元,商场平均每天可多售出10件.求:(1)若商场每件衬衫降价4元,则商场每天可盈利多少元?(2)若商场平均每天要盈利1200元,每件衬衫应降价多少元?(3)要使商场平均每天盈利1600元,可能吗?请说明理由.21.开学初期,天气炎热,水杯需求量大.双福育才中学门口某超市购进一批水杯,其中A种水杯进价为每个15元,售价为每个25元;B种水杯进价为每个12元,售价为每个20元(1)该超市平均每天可售出60个A种水杯,后来经过市场调查发现,A种水杯单价每降低1元,则平均每天的销量可增加10个.为了尽量让学生得到更多的优惠,某天该超市将A种水杯售价调整为每个m元,结果当天销售A种水杯获利630元,求m的值.(2)该超市准备花费不超过1600元的资金,购进A、B两种水杯共120个,其中B种水杯的数量不多于A种水杯数量的两倍.请为该超市设计获利最大的进货方案,并求出最大利润.22.如图,在ABC △中,90B ∠=︒,12 cm AB =,16 cm BC =.点P 从点A 开始沿AB 边向点B 以1 cm/s 的速度移动,点Q 从点B 开始沿BC 边向点C 以2 cm/s 的速度移动.如果P 、Q 分别从A 、B 同时出发,当一个点到达终点时,另一个点也随之停止运动.设运动的时间为t 秒.(1)当t 为何值时,PBQ △的面积等于235 cm ?(2)当t 为何值时,PQ 的长度等于?(3)若点P 、Q 的速度保持不变,点P 在到达点B 后返回点A ,点Q 在到达点C 后返回点B ,一个点停止,另一个点也随之停止.问:当t 为何值时,PCQ △的面积等于232 cm ?23.近期猪肉价格不断走高,引起了民众与政府的高度关注.当市场猪肉的平均价格每千克达到一定的单价时,政府将投入储备猪肉以平抑猪肉价格.(1)从去年年底至今年3月20日,猪肉价格不断走高,3月20日比去年年底价格上涨了60%.某市民在今年3月20日购买2.5千克猪肉至少要花200元钱,那么去年年底猪肉的最低价格为每千克多少元?(2)3月20日,猪肉价格为每千克60元,3月21日,某市决定投入储备猪肉并规定其销售价在每千克60元的基础上下调%a 出售.某超市按规定价出售一批储备猪肉,该超市在非储备猪肉的价格仍为每千克60元的情况下,该天的两种猪肉总销量比3月20日增加了%a ,且储备猪肉的销量占总销量的34,两种猪肉销售的总金额比3月20日提高了1%10a ,求a 的值.第二章综合测试答案解析一、1.【答案】A【解析】设另一个根为x ,则25x +=-,解得7x =-.故答案为:A .2.【答案】B【解析】1x ∵,2x 是一元二次方程220x x -=的两根,122x x +=∴.故答案为:B .3.【答案】C【解析】22630x x ++=∵2332x x +=-∴ 29393424x x ++=-+∴ 23324x ⎛⎫+= ⎪⎝⎭∴ 故答案为:C4.【答案】D【解析】220x x +=∵, ()20x x +=∴,0x =∴或2-,故答案为:D .5.【答案】A【解析】方程2680x x -+=,得12x =,24x =,∵当2为腰,4为底时,224+=,不符合三角形三边关系,∴不能构成等腰三角形;∵当4为腰,2为底时,能构成等腰三角形,周长为44210++=.故答案为:A .6.【答案】C【解析】设原正方形的边长为 cm x ,则面积增加后的正方形的边长为()2 cm x +,根据题意得:()22232x x +=+解之:7x =.故答案为:C7.【答案】B【解析】设每个支干长出x 个分支,根据题意得 113x x x ++⋅=,整理得2120x x +-=,解得13x =,24x =-(不符合题意舍去),即每个支干长出3个分支.故应选B .8.【答案】C【解析】设道路的宽应为x 米,由题意有()()100807 644x x --=,故答案为:C9.【答案】D【解析】∵关于x 的一元二次方程2410kx x -+=有实数根,0k ≠∴且()2440k =--≥,解得:4k ≤且0k ≠.故答案为:D .10.【答案】A【解析】设新品种花生亩产量的增长率为x , 根据题意得()1200150%11322x x ⎛⎫+⋅+= ⎪⎝⎭, 解得10.220%x ==,2 3.2x =-(不合题意,舍去),则新品种花生亩产量的增长率为20%,故选A .二、11.【答案】0【解析】将1x =代入()22110k x k x -+-=中,得20k k -=,解得1k =或0,10k -≠∵,1k ≠∴,0k =∴.故答案为:0.12.【答案】1【解析】根据题意得21x x x -=-,整理得:2210x x -+=,()210x -=∴,解得:1x =故答案为:1.13.【答案】2 020【解析】m ∵、n 是方程2 2 0210x x +-=的两个实数根 2 2 0210m m +-=∴,1m n +=-2 2 021m m +=∴∴原式2 2 0211 2 020m m m n =+++=-=.故答案为:2 020.14.【答案】3【解析】根据题意得20a -≠,且()()224210a =---⨯>,解得:1a >且2a ≠, ∴整数a 的最小值为:3.故答案为:3.15.【答案】2【解析】根据题意可知CN t =,2AM t =,8BN t =-∴,122BM t =-,MNB ∵△的面积为224 cm()()11228242x t t -⨯-=∴ 解得12x =,212x =(舍去)故答案为:2.16.【答案】4=【解析】解方程2680x x -+=得:2x =和4,即4AC =,2BD =,∵四边形ABCD 是菱形,90AOD ∠=︒∴,2AO OC ==,1BO DO ==,由勾股定理得:AD ==4三、17.【答案】(1)22x +=±10x =,24x =-(2)2210x x --=21112102168x x ⎛⎫+-= ⎪⎝⎭- 2192048x ⎛⎫-= ⎪⎝⎭ 219248x ⎛⎫-= ⎪⎝⎭ 219416x ⎛⎫-= ⎪⎝⎭ 1344x -=± 11x =∴,212x =(3)2410x x --=x12x =+22x =(4)21220x x ---=2230x x --=()()310x x -+=13x =,21x =-18.【答案】(1)1a =,2b =,4c m =-24b ac ∆=-∴()2244m =--204m =-∵一元二次方程2240x x m ++-=有两个实数根,2040m -∴≥5m ≤.(2)当1m =时,2230x x +-=.则()()130x x -+=解得11x =,23x =-(答案不唯一).19.【答案】(1)根据题意,得:503002x x -⎛⎫= ⎪⎝⎭, 解得:20x =或30x =,∵墙的长度为24 m ,20x =∴(2)设菜园的面积是S , 则502x S x -⎛⎫= ⎪⎝⎭ 21252x x =+ ()216252522x =-+, 0-12∵<, ∴当25x <时,S 随x 的增大而增大,24x ∵≤,∴当24x =时,S 取得最大值,∴总费用24200261508 700 1 000=⨯+⨯=<, ∴没有超过预算20.【答案】(1)()41020404 1 0085⎛⎫⨯+-= ⎪⎝⎭(元). 答:商场每件衬衫降价4元,则商场每天可盈利1 008元.(2)设每件衬衫应降价x 元,根据题意,得()()40202 1 200x x -+=,整理,得2302000x x -+=,解得110x =,220x =,∵要尽量减少库存,20x =∴.答:每件衬衫应降价20元.(3)不可能.理由如下:令()()40202 1 600x x -+=,整理得2304000x x -+=,90044000∆=-⨯∵<,∴商场平均每天不可能盈利1 600元.21.【答案】(1)设超市将A 种水杯售价调整为每个m 元,则单件利润为()15m -元,销量为()()60102531010m m ⎡⎤⎣=-⎦+-个,依题意得: ()()1531010630m m --=,解得:122m =,224m =,答:为了尽量让学生得到更多的优惠,22m =.(2)设购进A 种水杯x 个,则B 种水杯()120x -个.设获利y 元,依题意得:()1512120 1 6001202x x x x⎧+-⎪⎨-⎪⎩≤≤, 解不等式组得:140533x ≤≤,本次利润()()()251512020122960y x x x =-+--=+.20∵>,y ∴随x 增大而增大,当53x =时,最大利润为1 066元.22.【答案】(1)()12cm BP AB AP t =-=-,2 cm BQ t =. 根据三角形的面积公式,得3251PB BQ ⋅=, 即()2212351t t -⋅=, 整理,得212350t t -+=,解得15t =,27t =.故当t 为5或7时,PBQ △的面积等于235 cm .(2)根据勾股定理,得()()()22222212282PQ BP BQ t t =+=-+=, 整理,得2524160t t -+=, 解得145t =,24t =.故当t 为45或4时,PQ 的长度等于. (3)①当08t <≤时,()12c m PB t =-,()2c 16m CQ t =- 由题意,得()()162123212t t -⨯-=, 解得:14t =,216t =(舍去).②当812t <≤时,()12c m PB t =-,()1c 26m CQ t =-, 由题意,得()()216122123t t -⨯-=,此方程无解. ③当1216t <≤时,()12cm PB t =-,()1c 26m CQ t =-, 由题意,得()()216122132t t -⨯-=, 解得:14t =(舍去),216t =.综上所述,当t 为4或16时,PCQ △的面积等于232 cm .23.【答案】(1)设去年年底猪肉价格为每千克x 元;根据题意得:()2.5160%200x ⨯+≥,解得:50x ≥.答:去年年底猪肉的最低价格为每千克50元;(2)设3月20日的总销量为1; 根据题意得:31160(1%)(1%)60(1%)601%4410a a a a ⎛⎫-⨯++⨯+=+ ⎪⎝⎭, 令%a y =,原方程化为:()31160(1)160(1)6014410y y x y y ⎛⎫-⨯+++=+ ⎪⎝⎭, 整理得:250y y -=,解得:0.2y =,或0y =(舍去),则%0.2a =,20a =∴;答:a的值为20.。
鲁教五四制九年级英语上册Unit 2 综合素质评价限时: 60分钟满分: 100分一、<荣德原创>完形填空(每小题1. 5分,共15分)Although many parents and teachers believe school uniforms improve students’ behavior, researchers at The Ohio State University have found that this may not be 1._______.The 2. _______ had recently been published in Early Childhood Research Quarterly. It used the data from Early Childhood Longitudinal (纵向的) Study. This 3._______ 6,320 US students from kindergarten to the final year of primary school, or from about age 5 to age 10.Ev ery school year, teachers rated students’ social skills and behavioral problems, 4. _______ anxiety and aggression (攻击性). They also noted how often each student was absent from class. The researchers found that uniforms did not affect social skills or behavior. However, students from low-income families in schools that require uniforms did have better attendance (出勤率). But this 5. _______ was less than one day per year.In the final year of primary school, the students also reported on their own feelings and experiences. They include their sense of belonging and their 6. _______ experiences of bullying and social anxiety.The researchers found that school uniforms did not have a(n) 7. _______ of the students’ experiences of bullying or social anxiety. However, 8. _______ who had to wear uniforms reported a lower sense of belonging, compared with the students who attended schools that didn’t require uniforms.Arya Ansari, the study’s lead author, noted that the data doesn’t explain this finding, but suggested that it may be 9. _______ students aren’t able to express themselves through clothing when they’re wearing a uniform.Ansari said this research is 10. _______ because school uniforms are becoming more popular in the US.1. A. true B. false C. clear D. sure2. A. lesson B. study C. article D. book3. A. collected B. changed C. promised D. followed4. A. against B. through C. including D. without5. A. difference B. choice C. challenge D. progress6. A. sweet B. awful C. simple D. proud7. A. prediction B. practice C. experience D. effect8. A. those B. that C. these D. this9. A. until B. whether C. because D. unless10. A. famous B. strange C. stupid D. important二、阅读理解(每小题2 分,共20 分)A [2022·鄂州]In my opinion, China’s “Double Reduction” Policy (“双减”政策) aimed at easing (减轻) education-related pressure on parents and children is effective. Now take my home as an example to show how it works.“Dad! Get up! You promised to take us to the zoo today!”my two daughters shouted together one recent Saturday morning. The clock had just struck seven, but our house had already gotten noisier than the monkeys in the zoo!For families with children, weekends have become very different. In the past, my wife and I could at least sleep in (睡懒觉). Then at 9 o’clock, we had to wake up the kids. After throwing them into a tutoring class (辅导班), we could enjoy several hours to ourselves. But now, these classes are gone altogether. Kids, of course, are happy about this. Every Tuesday or Wednesday evening, my girls would ask me, “Where are we going to spend this coming Saturday?”Luckily, there are still some classes for them to attend. On Sundays, my girls go to learn ballet and chess. They really enjoy their time there. My elder daughter is old enough to read quietly on her own. On lucky days, we can get her to read together with her sister. Still, a quiet “competition” is on. My girls sometimes talk about how their classmates have spent an exciting weekend. It’s their way of complaining about my laziness.Weekends are more tiring now for parents, but I think they are good for kids.After all, childhood should be more than just studying school subjects. It should be more colorful.11. What is the aim of the “Double Reduction” Policy?A. To ease education-related pressure on parents and children.B. To make parents stay with their children at weekends.C. To make parents have more time for themselves at weekends.D. To make children and their parents have a good time at weekends.12. What did the writer do with his children one recent Saturday morning?A. They travelled to the countryside.B. They went camping.C. They went to the zoo.D. They went to a tutoring class.13. When the tutoring classes are gone altogether, children are _______.A. tiredB. sadC. happyD. surprised14. Which of the following is NOT true?A. The writer’s elder daughter is old enough to read quietly by herself.B. The “Double Reduction” Policy is effective.C. The writer’s children learn ballet and chess on Sundays now.D. Weekends are more relaxing for parents because of the “Double Reduction”Policy.15. What might be the writer’s attitude (态度) toward the policy?A. Supportive.B. Disapproving.C. Doubtful.D. Unsure.B [2022·绥化改编]Welcome to Sunshine FarmHello, everyone! We are famous for our fresh and delicious tomatoes. Do you want to come here?We invite you to visit the farm and enjoy our products. All the customers will have a safe open-air environment. You can have a good time here. The following instructions may help you.To pick the tomatoes, you need to make a reservation (预约) from 8a.m. to 5 p. m. the day before the picking day on our website. It is necessary.No pets are allowed on the farm.You can use your baskets or buy ours. A basket only costs two yuan.The tomatoes are 15 yuan for one kilo.If you bring your children here, they must stay close to you. Running here and there is not allowed. We hope they can follow the farm rules.In order to stay safe and healthy, pl ease don’t come to the farm if you are ill.16. If you go to the farm on Feb. 25th, you can make a reservation at _______.A. 9 a. m. on Feb. 23rdB. 2 p. m. on Feb. 24thC. 7 a. m. on Feb. 24thD. 8 a. m. on Feb. 23rd17. According to the passage, we can’t take _______ to the farm.A. a phoneB. a basketC. a dogD. a child18. On the farm, children are allowed to _______.A. stay close to their parentsB. run everywhereC. play with their petsD. pick vegetables19. You should pay _______ for 2 kilos of tomatoes on Sunshine Farm.A. 15 yuanB. 10 yuanC. 30 yuanD. 40 yuan20. The instructions are most probably from _______.A. a shopperB. a farm ownerC. a waiterD. a housewife三、词汇运用(每小题2 分,共20 分)A)根据句意及所给提示填空。
九年级上册综合检测(二)[时间:120分钟 分值:120分]卷Ⅰ(选择题,共42分)一、选择题(本大题有16个小题,1~10小题,各3分,11~16小题,各2分,在每小题给出的四个选项中,只有一项是符合题目要求的) 1.2sin45°的值等于 ( ) A .√22B .√2C .√24D .2√22.一元二次方程x 2+x=0的解是 ( )A .0B .0或1C .1D .0或-13.在5轮“中国汉字听写大赛”选拔赛中,甲、乙两位同学的平均分都是90分,甲成绩的方差是15,乙成绩的方差是3,下列说法正确的是( )A .甲的成绩比乙的成绩稳定B .乙的成绩比甲的成绩稳定C .甲、乙两人的成绩一样稳定D .无法确定甲、乙的成绩谁更稳定 4.若反比例函数y=kx 的图像经过点(-1,3),则这个函数的图像一定过点 ( )A .(-3,1)B .-13,3C .(-3,-1)D .13,35.数学课上,老师让学生利用尺规作图画Rt △ABC ,使其斜边AB=c ,一条直角边BC=a ,小明的作法如图2-ZH -1所示,你认为这种作法中判断∠ACB 是直角的依据是 ( ) A .勾股定理 B .勾股定理的逆定理C .直径所对的圆周角是直角D .90°的圆周角所对的弦是直径图2-ZH -1 图2-ZH -26.李老师用手机软件记录了某个月(30天)每天健步走的步数(单位:万步),将记录结果绘制成了如图2-ZH -2所示的统计图.在每天所走的步数这组数据中,众数和中位数分别是 ( ) A .1.2,1.3 B .1.4,1.3 C .1.3,1.4 D .1.3,1.3图2-ZH-37.如图2-ZH-3,在平面直角坐标系中,已知点O(0,0),A(6,0),B(0,8),以某点为位似中心,作出与△AOB的位似比为k的位似三角形CDE,则位似中心的坐标和k的值分别为()A.(0,0),2B.(1,1),12C.(2,2),12D.(2,2),28.如图2-ZH-4为4×4的正方形网格图,A,B,C,D,O均在格点上,点O是 ()A.△ACD的内心B.△ABC的内心C.△ACD的外心D.△ABC的外心图2-ZH-4 图2-ZH-59.如图2-ZH-5,点A是量角器直径的一个端点,点B在半圆周上,点P在AB⏜上,点Q在AB上, 且PB=PQ.若点P对应140°(40°),则∠PQB的度数为()A.65°B.70°C.75°D.80°10.某公司今年4月的营业额为2500万元,按计划第二季度的总营业额要达到9100万元,设该公司5,6两月的营业额的月平均增长率为x.根据题意列方程,则下列方程正确的是() A.2500(1+x)2=9100 B.2500(1+x%)2=9100C.2500(1+x)+2500(1+x)2=9100D.2500+2500(1+x)+2500(1+x)2=910011.已知在Rt△ABC中,∠BAC=90°,过点A作一条直线,使其将△ABC分成两个相似的三角形.观察下列图中尺规作图痕迹,作法错误的是()图2-ZH-612.如图2-ZH -7,DE 是△ABC 的中位线,M 是DE 的中点,CM 的延长线交AB 于点N ,则NM ∶MC 等于 ( )A .1∶2B .1∶3C .1∶4D .1∶5图2-ZH -7 图2-ZH -813.函数y=kx的图像如图2-ZH -8所示,那么函数y=kx-k 的图像大致是图2-ZH -9中的 ( )图2-ZH -914.如图2-ZH -10,某数学社团开展实践性研究,在大明湖南门A 测得历下亭C 在北偏东37°方向,继续向北走105 m 后到达游船码头B ,测得历下亭C 在游船码头B 的北偏东53°方向.请计算一下南门A 与历下亭C 之间的距离约为参考数据:tan37°≈34,tan53°≈43 ( )A .225 mB .275 mC .300 mD .315 m图2-ZH -10 图2-ZH -1115.如图2-ZH -11,在Rt △ABC 中,∠ACB=90°,在以AB 的中点O 为坐标原点,AB 所在直线为x 轴建立的平面直角坐标系中,将△ABC 绕点B 顺时针旋转,使点A 旋转至y 轴的正半轴上的点A'处.若AO=OB=2,则阴影部分的面积为 ( ) A .23π B .23π-1C .4π3+1D .4π316.如图2-ZH -12,在边长为1的正方形ABCD 中,动点F ,E 分别以相同的速度从D ,C 两点同时出发向点C ,B 运动(其中一个点到达终点时两点同时停止运动),连接AE ,BF 交于点P ,过点P 作PM ∥CD 交BC 于点M ,PN ∥BC 交CD 于点N ,连接MN ,在运动过程中有下列结论:①△ABE ≌△BCF;②AE=BF;③AE⊥BF;④CF2=PE·BF;⑤线段MN的最小值为√5-22.其中正确的结论有()A.2个B.3个C.4个D.5个图2-ZH-12卷Ⅱ(非选择题,共78分)二、填空题(本大题有3个小题,共11分.17小题3分,18~19小题各有2个空,每空2分,把答案写在题中横线上)17.已知xy =34,那么2xx+y的值为.18.若关于x的方程2x2-5sin Ax+2=0有两个相等的实数根,其中∠A是锐角三角形ABC的一个内角,则sin A=,此时方程的根是.19.如图2-ZH-13所示,有(n+1)个直角边长为3的等腰直角三角形△AB1C1,△C1B2C2,…,它们的斜边在同一直线上,设△B2D1C1的面积为S1,△B3D2C2的面积为S2,…,△B n+1D n C n的面积为S n,则S1=,S n=.图2-ZH-13三、解答题(本大题有7个小题,共67分,解答应写出文字说明,证明过程或演算步骤)20.(本小题满分8分)已知关于x的一元二次方程kx2-4x+2=0有两个不相等的实数根.(1)求实数k的取值范围;(2)写出满足条件的k的最大整数值,并求此时方程的根.21.(本小题满分9分)如图2-ZH-14,小亮一家到桃林口水库游玩.在岸边码头P处,小亮和爸爸租船到库区游玩,妈妈在岸边码头P处观看小亮与爸爸在水面划船,小船从P处出发,沿北偏东60°方向划行,划行速度是20米/分,划行10分钟后到达A处,接着向正南方向划行一段时间到达B处,在B处小亮观测到妈妈所在的P处在北偏西37°的方向上,这时小亮与妈妈相距多少米?(精确到1 m,参考数据:sin37°≈0.60,cos37°≈0.80,tan37°≈0.75,√2≈1.41,√3≈1.73)图2-ZH-1422.(本小题满分9分)为了了解某校新九年级暑期阅读课外书的情况,某研究小组随机采访该校新九年级的20位同学,得到这20位同学暑期阅读课外书的册数如下:册数0 2 3 5 6 8 10人数 1 2 4 8 2 2 1(1)求这20位同学暑期阅读课外书册数的中位数、众数、平均数;(2)若小明同学把册数中的数据“8”看成了“7”,那么中位数、众数、平均数中不受影响的是;(3)若该校有600名新九年级学生,试估计该校新九年级学生暑期阅读课外书的总册数.23.(本小题满分9分)近年来,随着城市居民入住率的增加,污水处理问题成为城市的难题.某城市环境保护局协同自来水公司为鼓励居民节约用水,减少污水排放,规定:居民用水量每月不超过a吨时,只需交纳10元水费,如果超过a吨,除按10元收费外,超过部分,每吨按5a元收取水费(水费+污水处理费).(1)某居民2019年3月份的用水量为8吨,超过规定水量,用含a的代数式表示该用户应交多少元水费;(2)下表是这户居民4月份和5月份的用水量和交费情况;月份用水量(吨) 交水费总金额(元)4 7 705 5 40根据上表中的数据,求规定用水量a的值;(3)结合当地水资源状况,谈谈如何开展水资源环境保护,如何节约用水.24.(每小题满分10分)如图2-ZH-15,矩形ABCD为台球桌面,AD=240 cm,AB=120 cm,球目前在点G处,AG=80 cm.如果小丁瞄准BC边上的点F将球打过去,经过点F反弹后碰到CD边上的点H,再经过点H反弹后,球刚好弹到AD边的中点E处落袋.(1)求证:△BGF∽△DHE;(2)求BF的长.图2-ZH-15的图像25.(本小题满分10分)如图2-ZH-16,已知一次函数y=k1x+b的图像与反比例函数y=k2x交于第一象限内的P1,8,Q(4,m)两点,与x轴交于点A.2(1)写出点P关于原点的对称点P'的坐标;(2)分别求出这两个函数的表达式;(3)求∠P'AO的正切值.图2-ZH-1626.(本小题满分12分)问题呈现:阿基米德折弦定理:如图2-ZH -17,AB 和BC 是☉O 的两条弦(即折线ABC 是圆的一条折弦),BC>AB ,M 是ABC⏜的中点,则从M 向BC 所作垂线的垂足D 是折弦ABC 的中点,即CD=AB+BD.下面是运用“截长法”证明CD=AB+BD 的部分过程.图2-ZH -17证明:如图②,在CB 上截取CG=AB ,连接MA ,MB ,MC ,MG. ∵M 是ABC⏜的中点,∴MA ⏜=MC ⏜, ∴MA=MC.……请按照上面的证明思路,写出该证明的剩余部分. 实践应用:(1)如图③,已知△ABC 内接于☉O ,BC>AB>AC ,D 是ACB ⏜的中点,依据阿基米德折弦定理可得图中某三条线段的等量关系为 .(2)如图④,已知等腰三角形ABC 内接于☉O ,AB=AC ,D 为AB ⏜上一点,连接DB ,∠ACD=45°,AE ⊥CD 于点E ,△BDC 的周长为4√2+2,BC=2,请求出AC 的长.教师详解详析1.B [解析] ∵sin45°=√22,∴2sin45°=√2.2.D [解析] 原方程变形为x (x+1)=0,解得x 1=0,x 2=-1.3.B [解析] ∵乙成绩的方差<甲成绩的方差,∴乙的成绩比甲的成绩稳定.4.A [解析] ∵反比例函数y=kx 的图像经过点(-1,3),∴k=-1×3=-3.∵-3×1=-3,-13×3=-1,-3×(-1)=3,13×3=1,∴反比例函数y=kx 的图像一定过点(-3,1).5.C6.B7.C [解析] 如图所示,位似中心F 的坐标为(2,2),k 的值为DF FO =12.8.D [解析] 设小正方形的边长为1,则由图可得OA=OB=OC=√12+22=√5,所以点O 是 △ABC 的外心.9.B [解析] ∵点P 对应140°,∴∠ABP=70°.∵PB=PQ ,∴∠PQB=∠ABP=70°. 10.D11.B [解析] A 项,由作图痕迹可知:∠BAD=∠C ,可以推出∠B=∠CAD ,故△CDA 与△ABD 相似;B 项,无法判断△CAD 与△ABD 相似;C 项,由作图痕迹可知:AD ⊥BC.∵∠BAC=90°,故可得△CAD ∽△ABD ;D 项,由作图痕迹可知:AD ⊥BC ,∵∠BAC=90°,故可得△CAD ∽△ABD. 12.B [解析] ∵DE 是△ABC 的中位线,M 是DE 的中点,∴DM ∥BC ,DM=ME=12DE=14BC ,∴△NDM ∽△NBC ,∴DM BC =NM CN =14,∴NM MC =13.13.B [解析] ∵反比例函数y=kx 的图像位于第二、四象限,∴k<0,∴-k>0.∵k<0,∴函数y=kx-k 的图像过第二、四象限.又∵-k>0,∴函数y=kx-k 的图像与y 轴相交于正半轴,∴一次函数y=kx-k 的图像过第一、二、四象限.故选B .14.C [解析] 如图,过点C 作CE ⊥BA 于点E.设EC=x m,BE=y m .在Rt △ECB 中,tan53°=EC EB ,即x y =43. 在Rt △AEC 中,tan37°=ECAE ,即x 105+y =34.解得x=180,y=135.∴AC=√EC 2+AE 2=√1802+2402=300(m).15.D [解析] ∵∠ACB=90°,OA=OB=2,∴AB=4,OC=2,∴AC=BC=2√2,∴△ABC 是等腰直角三角形.∵△ABC 绕点B 顺时针旋转,使点A 旋转至y 轴的正半轴上的点A'处,∴BA'=AB=4,∴BA'=2OB ,∴∠OA'B=30°,∴∠A'BA=60°,即旋转角为60°,S 阴影=S 扇形ABA'+S △A'BC'-S △ABC -S 扇形CBC'=S 扇形ABA'-S 扇形CBC'=60π×42360-60π×(2√2)2360=43π.16.C [解析] ∵四边形ABCD 是正方形,∴AB=BC=CD=DA , ∠ABC=∠BCD=∠CDA=∠DAB=90°.∵动点F ,E 的速度相同,且同时开始运动,∴DF=CE.又∵CD=BC ,∴CF=BE.在△ABE 和△BCF 中,{AB =BC ,∠ABE =∠BCF ,BE =CF ,∴△ABE ≌△BCF (SAS),故①正确;∴∠BAE=∠CBF ,AE=BF ,故②正确;∵∠BAE+∠BEA=90°,∴∠CBF+∠BEA=90°,∴∠APB=90°,即AE ⊥BF ,故③正确;在△BPE 和△BCF 中,∵∠BPE=∠BCF=90°,∠PBE=∠CBF ,∴△BPE ∽△BCF ,∴PE CF =BEBF ,∴CF ·BE=PE ·BF .∵CF=BE ,∴CF 2=PE ·BF ,故④正确;∵点P 在运动过程中保持∠APB=90°,∴点P 的运动路径是一段以AB 为直径的弧,设AB 的中点为G ,连接CG 交弧于点P ,此时CP的长度最小,如图.在Rt △BCG 中,CG=2+BG 2√1+14=√52.∵PG=12AB=12,∴CP=CG-PG=√52-12=√5-12.∵PN ∥BC ,PM ∥CD ,∠BCD=90°, ∴四边形CMPN 为矩形,∴MN=CP ,∴线段MN 的最小值为√5-12,故⑤错误. 综上可知正确的结论有4个.故选C .17.67[解析] ∵xy=34,∴可设x=3k,则y=4k,则原式=6k3k+4k=67.18.45x1=x2=1[解析] ∵关于x的方程2x2-5sin Ax+2=0有两个相等的实数根,∴(-5sin A)2-4×2×2=0,解得sin A=±45.又∵∠A是锐角三角形ABC的一个内角,∴sin A=45.∴原方程为2x2-4x+2=0,解得x1=x2=1.19.949n2n+2[解析] 连接B1,B2,B3,B4,B5,如图所示,∵(n+1)个直角边长为3的等腰直角三角形的斜边在同一直线上,∴B1,B2,B3,B4,B5的连线与直线AC5平行.∵等腰直角三角形的直角边长为3,∴S△AB1C1=12×3×3=92.由题意可知:△B1C1B2为直角边长为3的等腰直角三角形,∴△B1C1B2≌△C1B1A.∴B1B5∥AC5,∴△AC1D1∽△B2B1D1,∴C1D1B1D1=AC1B1B2=1,∴S1=12S△B1C1B2=12×92=94,同理可得△B2D2B3∽△C2D2A,∴B2B3AC2=B2D2D2C2=12,∴S2=23S△B2B3C2=23×92=3,同理可得△B3D3B4∽△C3D3A,∴B3B4AC3=B3D3D3C3=13,∴S3=34S△B3B4C3=34×92=278,…,∴S4=45S△B4B5C4=45×92=185,∴S n=nn+1×92=9n2(n+1)=9n2n+2.20.解:(1)由题意得b2-4ac>0,即(-4)2-4k·2>0,解得k<2.又∵k≠0,∴k<2且k≠0.(2)∵k<2且k取最大整数,∴k=1.当k=1时,原方程为x2-4x+2=0.解得x1=2+√2,x2=2-√2.21.解:如图,过点P作PQ⊥AB于点Q.由已知可得∠APQ=30°,则AQ=12AP.∵AP=20×10=200(米),∴AQ=100(米),∴PQ=√AB2-AQ2=100√3(米).在Rt△BPQ中,sin B=PQBP ,∴BP=PQsinB≈100√3÷0.60≈288(米).∴此时小亮与妈妈相距约288米.22.解:(1)这20位同学暑期阅读课外书册数的中位数是(5+5)÷2=5(册),众数为5册, 平均数为0×1+2×2+3×4+5×8+6×2+8×2+10×120=4.7(册).故这20位同学暑期阅读课外书册数的中位数是5册,众数是5册,平均数是4.7册. (2)中位数和众数 (3)4.7×600=2820(册).答:该校新九年级学生暑期阅读课外书的总册数约是2820册. 23.解:(1)3月份应交水费10+5a (8-a )=(10+40a-5a 2)元. (2)由题意,得5a (7-a )+10=70,解得a 1=3,a 2=4. 5a (5-a )+10=40,解得a 1=3,a 2=2.综上,a=3.(3)既然我们的水资源比较缺乏,就要提高节水技术、防治水污染、植树造林(答案合理即可). 24.解:(1)证明:∵四边形ABCD 是矩形,∴∠B=∠C=∠D=90°.∵∠FHC=∠EHD ,∠HFC+∠FHC=∠HED+∠EHD=90°,∴∠HED=∠HFC.又∵∠GFB=∠HFC ,∴∠GFB=∠HED ,∴△BGF ∽△DHE.(2)如图,延长AD 交FH 的延长线于点N ,过点N 作NM ⊥BC 交BC 的延长线于点M , 则四边形DNMC 为矩形,∴DN=CM ,MN=CD=AB=120 cm .∵∠FHC=∠EHD ,∠FHC=∠NHD ,∴∠EHD=∠NHD.在△EDH 和△NDH 中,{∠EDH =∠NDH =90°,DH =DH ,∠EHD =∠NHD ,∴△EDH ≌△NDH ,∴DN=DE=120 cm .∵∠B=∠M=90°,∠GFB=∠HFC ,∴△GBF ∽△NMF ,∴BGMN =BFMF .∵AB=120 cm,AG=80 cm,∴BG=40 cm,∴40120=BF240-BF+120.解得BF=90(cm).25.解:(1)点P 关于原点的对称点P'的坐标是-12,-8.(2)∵P12,8在反比例函数y=k 2x的图像上,∴k 2=12×8=4,∴反比例函数的表达式是y=4x . ∵Q (4,m )在反比例函数y=4x 的图像上,∴4m=4,解得m=1,∴Q (4,1). ∵一次函数y=k 1x+b 的图像过P12,8,Q (4,1)两点,∴{12k 1+b =8,4k 1+b =1,解得{k 1=-2,b =9.∴一次函数的表达式是y=-2x+9.(3)如图,过点P'作P'B ⊥x 轴于点B ,则P'B=8,BO=12. 对于y=-2x+9,令y=0,则x=92,∴AB=12+92=5.在Rt △ABP'中,tan ∠P'AO=P 'B AB =85.26.解:问题呈现证明:在CB 上截取CG=AB ,连接MA ,MB ,MC ,MG. ∵M 是ABC⏜的中点,∴MA ⏜=MC ⏜,∴MA=MC. 在△MBA 和△MGC 中,{BA =GC ,∠A =∠C ,MA =MC ,∴△MBA ≌△MGC (SAS),∴MB=MG.又∵MD ⊥BC ,∴BD=GD ,∴CD=GC+GD=AB+BD. 实践应用 (1)BE=CE+AC.(2)∵AB=AC ,∴AB⏜=AC ⏜,∴A 是BAC ⏜的中点.∵AE ⊥CD ,根据阿基米德折弦定理,得CE=BD+DE. ∵△BCD 的周长为4√2+2,∴BD+CD+BC=4√2+2,∴BD+DE+CE+BC=2CE+BC=4√2+2. ∵BC=2,∴CE=2√2.在Rt △ACE 中,∵∠ACD=45°,∴AE=CE=2√2,∴AC=4.。