九年级练习题4

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人教版九年级英语秋学期期中复习专项练习题四完成句子(共30张PPT)

15. 作为有礼貌的孩子，我们应该尽可能多地帮助他人。 As polite children, we should help others _____a_s_m__u_c_h as ____p_o_s_s_ib_l_e_/w__e_c.an 16. 我的父母不反对参加课外活动。(against) My parents have ____n_o_t_h_i_n_g_a_g_a_i_n_s_t _ta_k__in_g__p_a_rtthine after-class activities. 17. 我认为杰克可能正在家里玩电脑游戏。(might) I think Jack _______m__ig_h_t_b__e_pclaoyminpguter games at home.
about it twice.
6. 我发现与他沟通很困难。 I find _it_d_i_f_fi_c_u_lt__to_ communicate with him. 7. 很难相信他过去在学校常有问题。 ___It_'_s_h_a_r_d__to__b_e_li_evtheat he used to have difficulties in school. 8. 据我所知，他在这所学校已经工作了三十年。 ___A_s_f_a_r_a_s__I_k_n_o, whe has been working in this school for 30 years.
14. 你觉得这个才艺表演怎么样? (feel) ____H_o_w__d_o__y_o_u_f_e_e_l_a_b_o_u_t_t_h_e_t_a_l_e_n_t _s_h_ow? 15. 这位老人因其善良而为众人所敬仰。(look up to) ____T_h_e__o_ld__m__a_n_i_s_l_o_o_k_e_d_u_p__t_o_b_y__e_v_er_y_o_n_e__f_o_r his ____k_i_n_d_n_e_s_s.______________________________

人教版九年级全册英语 Unit4 单元练习题

Unit 4 单元练习卷一、单项选择(每题1分 ,共10分)( )1. We all know lazy people ________ succeed, so we should work hard to be successful.A. oftenB. seldomC. usuallyD. always( )2. —How beautifully Tina plays the piano!—Of course. She ________ learning it at the age of 5.A. took upB. set upC. put upD. picked up( )3. —Mom, can I do ________ much work in ________ a short time?—Dear, I think you can.A. so; soB. such; soC. so; suchD. such; such( )4. This place ________ a factory but now it is a park.A. used to beingB. used to beC. is used to beingD. using to be( )5. I can't go to the meeting ________ , but I'll send someone to speak for me.A. in dangerB. over and over againC. from time to timeD. in person( )6. —I can't stand swimming in cold rivers in winter.—But it's ________ for your health. You know I often swim in rivers in different seasons.A. helpfulB. harmfulC. painfulD. careful( )7. —Yan Jiashuo, a ________ girl, has won the prize of International Master of Memory.—Wow, she's great, isn't she?A. thirteen－year－oldB. thirteen－years－oldC. thirteen year oldD. thirteen years old( )8. There ________ a number of books in the library and the number of them ________ increasing.A. has; isB. have; areC. are; isD. is; are( )9. —Song Joong Ki is a movie star in Asia now.—That's true. He was once an excellent skater but had to ________ skating because of an accident.A. give upB. go onC. take upD. wake up( )10. When I see the national flag rise I always feel ________. I'll be the ________ of my country.A. proud; prideB. pride; proudC. pride; prideD. proud; proud二、完形填空(每题1.5分 ,共15分)Have you ever offered a helping hand to those who are in trouble?One day, two __1__ were walking along the road to school when they saw an old woman carrying a large basket of pears. They thought the woman looked very __2__. They went up to her and said, “Are you going to the town? If you are, we will help you carry your basket.〞“Thank you ,〞 __3__ the woman. “You are very kind. You see I'm weak and ill.〞 Then she told them that she was going to the market to __4__ the pears which grew on the only tree in her little garden.“We are all going to the __5__ ,〞said the boys. “Let us have the basket.〞 And they took hold of it, one each side. They walked __6__ with the heavy basket, but happily.The other day, I saw a little girl stop and __7__ a piece of orange peel(皮), which she threw into the dustbin(垃圾桶). “I wish __8__ would throw that on the sidewalk ,〞she said. “Someone may step on it and fall.〞Perhaps some may say that these are not __9__ things. That is right. But such a little thing showsthat you have a thoughtful mind and a feeling heart. We must not wait for the __10__ to do great things. We must begin with little things of love.( )1. A. boys B. girls C. men D. women( )2. A. bored B. tired C. pleased D. surprised( )3. A. asked B. told C. replied D. spoke( )4. A. bring B. buy C. take D. sell( )5. A. town B. market C. garden D. school( )6. A. weakly B. quickly C. slowly D. quietly( )7. A. take out B. cut off C. put down D. pick up( )8. A. nobody B. everybody C. somebody D. anybody( )9. A. little B. good C. great D. bad( )10. A. pay B. time C. advice D. love三、阅读理解阅读以下短文 ,做出正误判断或选出最正确答案。

九年级物理内能练习题四

内能练习题1、寒冷的冬季夜晚，许多人喜欢用热水将脚泡一泡才人睡。

在此过程中，脚的内能变化情况是（）A．减小 B．不变 C．增大 D．无法确定2、下列现象中，通过热传递改变物体内能的是（）A、两手相互摩擦，手发热。

B、用火炉烧水，水的温度升高。

C、用锯锯木头，锯条发热。

D、用砂轮磨菜刀，菜刀的温度升高。

3、爆米花是将玉米放入铁锅内．边加热边翻动一段时间后，“砰”的一声变成玉米花。

下列说法正确的是（） A.玉米粒主要通过翻动铁锅对其做功，使其内能增加B.玉米粒主要通过与铁锅间的热传递．使其内能增加C.玉米粒内水份受热膨胀对粒壳做功爆开，内能不变D.玉米粒内水份受热膨胀对粒壳做功爆开，内能增加4、如上图所示，将铁丝快速地弯折十余次，铁丝弯折处的温度会，这是通过的方式使其内能增加的．5、如图８所示的四种现象中，能说明做功可以改变物体内能的有；能说明热传递可以改变物体内能的有（只需填写序号字母）6、如图是小明在春游时从公园的滑梯上滑下时的情景。

请写出两个与此情景有关的物理知识：(1) ； (2) 。

7、锯木头时，对锯条，锯条的内能，温度升高。

8、图4所示的做法中，属于用做功的方法改变物体内能的是（）9、将装有酒精的金属管固定在桌子上，并用塞子塞紧。

快速来回拉动绕在管上的绳子，过一会儿塞子跳起来，如图7所示。

则 ( )A．拉动绳子过程，金属管温度升高，内能增加B．拉动绳子过程，管内酒精温度升高，蒸发加快C．塞子跳起时管内气体温度升高内能增加D．塞子跳起时管内气体内能全部转化为塞子的机械能10、下列说法正确的是（）Ａ．扩散现象只发生在液体之间Ｂ．物体温度越高，分子热运动越剧烈Ｃ．只有热传递才能改变物体的内能Ｄ．0℃的物体没有内能11在下列现象中，利用做功使物体内能增加的是（）A．手冷时对手“哈气”，手会感到暖和B．来回弯折的铁丝温度会升高C．冬季用热水袋取暖D．自行车轮胎放气时，气门嘴处温度会降低12、下列实例中属于机械能转化为内能的是（）A．内燃机的活塞在燃气推动下运动 B．点燃的火箭飞向太空C．陨石坠人地球大气层成为流星 D．夏天，广场上的石凳被晒得发烫13、救灾汽车正在公路上急驰，突然发现山体滑坡，紧急刹车。

2022-2023学年浙江九年级上学期科学同步练习专题4-物质的成分探究(解析版)

浙教版九年级上册第一章专题4物质的成分探究【同步练习-解析】一、选择题1．由于粗盐中含有少量MgCl2、CaCl2、Na2SO4等杂质，不能满足化工生产的要求，因此必须将粗盐进行精制。

流程如图：下列有关粗盐提纯错误的是（）A．加入稍过量的Na2CO3溶液，既能除去粗盐中的CaCl2，还可以除去溶液中过量的BaCl2B．实验操作Ⅲ要用到的实验玻璃仪器有玻璃棒、烧杯和漏斗C．每次操作均充分进行，对实验结束后的NaCl溶液结晶，得到的NaCl质量将会比原来多D．如果加入稍过量的NaOH、BaCl2试剂，改变这两种试剂加入的顺序会影响实验【答案】D【解析】A、加入稍过量的Na2CO3溶液，既能与氯化钙反应产生碳酸钙沉淀从而除去粗盐中的CaCl2，还可以与氯化钡反应产生碳酸钡沉淀以除去溶液中过量的BaCl2，此选项正确；B、实验操作II为过滤，过滤进要用到的玻璃仪器有玻璃棒、烧杯和漏斗，此选项正确；C、每次操作均充分进行，对实验结束后的NaCl溶液结晶，因在除杂过程中都生成了氯化钠，所以得到的NaCl质量将会比原来多，此选项正确；D、如果加入稍过量的NaOH、BaCl2试剂，改变这两种试剂加入的顺序，不会影响实验，只要保证氯化钡在碳酸钠溶液之前即可，此选项错误。

2．一包固体可能由硝酸铜、硫酸钠、氯化钠、碳酸钠、氢氧化钠中的一种或几种组成。

为了探究该固体的组成，某兴趣小组设计并开展以下实验。

其中，步骤I中固体全部消失，溶液呈蓝色，无气泡产生，步骤II、III中均可观察到有白色沉淀生成。

下列说法正确的是（）A．步骤I的实验现象说明原固体中一定没有氢氧化钠B．步骤II所得的白色固体中一定含有碳酸钡C．步骤II所得蓝色滤液中含有的阳离子只有3种D．原固体中一定有硝酸铜、硫酸钠，可能有氯化钠、氢氧化钠【答案】D【解析】A、固体加过量稀盐酸，固体完全溶解且溶液呈蓝色，说明固体中一定有硝酸铜，氢氧化钠不能确定，故说法错误；B、步骤Ⅲ加入过量硝酸钡产生白色沉淀，说明固体中一定含有硫酸钠，白色固体中一定含有硫酸钡，故说法错误；C、根据向固体加过量稀盐酸，固体完全溶解且溶液呈蓝色，说明固体中一定有硝酸铜；加入过量硝酸钡，说明硝酸钡有剩余，所以蓝色滤液中一定含有硝酸钡；硝酸钡和硫酸钠反应生成硝酸钠和硫酸钡沉淀，所以蓝色滤液中一定含有硝酸钠，综合分析可知，蓝色滤液中一定含有的溶质是：氯化氢、硝酸钠、硝酸钡、硝酸铜，阳离子有氢离子、钠离子、钡离子、铜离子，共四种，故说法错误；D、根据分析可知：原固体中一定含有的物质是硝酸铜、硫酸钠，可能有氯化钠、氢氧化钠，故说法正确。

人教版九年级化学单元练习题- 第四单元自然界的水(含答案)

人教版九年级化学单元练习题第四单元自然界的水一、选择题1．以下图标适合张贴在公共水龙头旁的是A．B．C．D．2．2021年世界水日的主题是“珍惜水、爱护水”，下列有关水的说法正确的是A．为了节约用水，可以直接用工业废水灌溉农田B．过滤和加热都可以使硬水软化C．水中的色素和异味可用活性炭吸附D．电解水实验说明水是由氢气和氧气组成的3．我市地表水质居全省第一，但地表水仍需经过净化才能饮用。

自来水厂的净水流程为：取水→沉降→过滤→活性炭吸附→含氯物质消毒杀菌。

其中涉及化学反应的环节是A．取水B．过滤C．活性炭吸附D．含氯物质消毒杀菌4．区分软水和硬水最简单的方法是加入（）A．食盐水B．醋酸C．蔗糖水D．肥皂水5．化学用语是国际通用语言，是学习化学的重要工具。

下列化学用语书写不正确的是A．铁元素：FeB．两个水分子：2H2OC．纯碱：NaOHD．一个臭氧分子由三个氧原子构成：O36．如果用“”表示氧原子，用“”示硫原子，则下列模型可以表示二氧化硫分子（SO2）的是A．B．C．D．7．自来水厂净水过程示意图如下，下列说法正确的是A．明矾是一种常用的絮凝剂B．过滤可除去水中杂质离子C．活性炭可长期使用无需更换D．经该净水过程得到的是纯水8．水是一种宝贵的自然资源，下列有关水的说法正确的是A．水由氢气和氧气组成B．生活中可用煮沸的方法降低水的硬度C．河水经沉淀、过滤、吸附，净化成蒸馏水D．电解水实验中产生O2和H2的体积比为2：19．水是生命之源。

如图为电解水的实验装置，下列说法正确的是A．该实验可用于研究水的组成B．正极所连的电极上产生的是氢气C．b中产生的气体可支持燃烧D．实验过程中漏斗内液面高度不变10．氮化锶（Sr3N2）是生产高端荧光粉的主要原料。

已知Sr3N2中N的化合价为﹣3，则Sr的化合价为A．﹣3 B．﹣2 C．+2 D．+311．关于H2O和H2O2的比较，不正确的是()A．都含有氢、氧元素B．都由氢、氧原子构成，结构相同C．一定条件下都能分解产生氧气D．H2O是常见的溶剂，H2O2溶液可用于医疗消毒12．下列关于有机物的叙述正确的是A．丙烷（C3H8）中碳元素、氧元素的质量比为3：8B．每个聚乙烯[化学式可表示为（C2H4）n]分子中含有2个碳原子、4个氢原子C．因为淀粉和纤维素的化学式都是（C6H10O5）n，所以它们是同一种物质D．甲醛（CH2O）、乙酸（C2H402）、葡萄糖（C6H12O6）中氢元素的质量分数相同13．1909年，德国化学家保罗·弗里德伦德尔在多刺海螺的鳃下腺中提取出了一种紫色染料――泰尔红紫（分子式为C16H8Br2N2O2），这种染料一直被用于为王室及富裕阶级的长袍染色。

人教版九年级英语第四单元综合练习题(含答案解析)

人教版九年级英语第四单元综合练习题（含答案解析）Ⅰ. 单项选择1.—What's the matter with you? Why do you keep ________ for long?—I feel sick and don't want to say anything.A.healthyB. warmC. silentD. bored2. You needn't do all the housework ________. You can let your families help you.A. in personB. for yourselfC. at leastD. for example3. My parents ________ go to visit my grandparents these days because they are too busy, so they feel very sorry.A. usuallyB. alwaysC. all the timeD. seldom4. Our teachers often require us ________ for our dreams.A. studyB. studyingC. studiedD. to study5. My classmate Li Jun saved a kid who feel into a river last Saturday. We ________ him.A. take pride ofB. take pride inC. be proud inD. be pride in6. My son ________ lazy, but he has been hard-working since he became a middle school student.A. used beB. use to beC. used to beD. is used to be7.You can talk about it with your father. He knows how to ________ all kinds of problems.A. give upB. make upC. agree withD. deal with8. Could you please ________ my baby while I'm cooking?A. take out ofB. take care ofC. take part inD. take away from9.—________ you ________ go to school by bike?—Yes. But now I usually go to school by bus.A. Did; use toB. Were; used toC. Do; use toD. Will; use to10. It ________ two months since I ________ my hometown.A. was; leaveB. was; leftC. has been; leaveD. has been; leftⅡ. 完形填空Last Friday, I met an old friend of mine in the supermarket. We haven't seen each other __1__ three years ago. She has __2__ a lot. She __3__ very fat and always __4__ a pair of glasses. But now, she is very thin and the glasses are gone. She __5__ so beautiful with big eyes and long blond hair—it used to be short and brown. She used to be very silent and was __6__ of speaking in public. Now she is humorous and she told me she was __7__ her school volleyball team and played __8__ piano. She said she hoped I could go to see her performance __9__. She looks so confident and I know she isn't what she used to be __10__.1.A. in B. for C. since D. with2. A. changed B. been changed C. turned D. become3. A. used to B. was used to be C. used to be D. was used to being4.A. wear B. wore C. put on D. dressed5. A. sounds B. was like C. looks D. looked6.A. afraid B. fond C. ready D. dare7. A. with B. for C. at D. on8. A. the B. a C. / D. some9. A. every day B. sometimes C. some day D. some time10. A. no more B. no longer C. not anymore D. anymoreⅢ. 阅读理解Chen Yujie, 15, studies at a boarding school in Ningbo, Zhejiang. __1__ It was not a short ride home and the trips were tiring. Chen hoped her parents could put the money on a bank card, so she didn't have to travel so often.__2__ “It's usually the most relaxing time for our family，”said Chen.She chose the right time. After a few turns of lobbying(游说), her parents finally agreed with Chen. __3__ So they have to choose a right time.US magazine Highights recently surveyed 1,521 kids aged 6－12 in the country, asking questions like “__4__ ”Results show that American kids seem to know when their parents are most receptive(乐于接受的). Meal time is discovered to be their most favorite time to talk to their parents. Bed time comes second, followed by time spent in the car.Chinese teenagers seem to have a similar tendency(倾向) over the problem. Qianjiang Daily, a newspaper in Zhejiang, did a survey about it. __5__ So do you have anything to talk to your parents about? Choose a good time.根据短文内容，从方框中选出五个句子填入文中空缺处，使短文内容完整正确。

人教版九年级英语第四单元练习题

人教版九年级英语第四单元练习题-CAL-FENGHAI.-(YICAI)-Company One1新人教版九年级英语知识点及练习题Unit 4 I used to be afraid of the dark一、用所给单词的适当形式填空。

1．I am interested in ________ (tell) a story.2．He dares ________ (watch) the show.3．He is able ________ (travel) in the countryside.4．He is ________ (prepare) to take risks in his life.5．He gave up ________ (drive)．6．I didn't use________ (be) popular.7．I ________ (use) to water my flowers.8．He enjoys ________ (listen) to the radio.9．I am afraid of ________ (go) out at night.10．To be healthy, we should eat a lot of ________ (vegetable)．11．It is hard ________ (understand) this book.12．We are ________ (pride) of our study.13．He advises me ________ (put) them away.14．It will ________ (take) five days to complete my work..二、单项选择1.He could properly deal ________ all kinds of situations.A ．to A ．talk A ．no more A ．off—I'm sorry.________ Jack ________ I have ever been there.A ．Either; orB ．Not only; but alsoC ．Both; andD ．Neither; nor6.The n umber of books in the bookshop is about 10,000 and a number of them ________ about science.A ．isB ．was B ．give upC ．areD ．were7.Mike was ill ye sterday. He had to________ his plan for the holiday.A ．draw upC ．carry outD ．hold on8.—My son seldom has ________ breakfast.—It is ________ unhealthy habit. You must ask him to change it.A ．/; anB ．the; anC ．/; aD ．the; a9.—Jack is a(n) ________ young man.—That's true. He always feels nervous when he speaks before people.A ．friendlyB ．shyC ．honestD ．lively10.—________ your brother speak Japanese?B ．intoC ．atD ．with D ．sayingD ．a not D ．about2.The boy stood before the teacher, not daring________ anything.B ．talks aboutC ．to sayB ．longer B ．at3.There is________ bread. The boy doesn't want any more.C ．not C ．in4.No mat ter wh at you do, you must be careful ________ what he said.5.—Tell us something about Canada, OK?—Yes, he has learnt it in Tokyo for three years.A ．ShouldB ．MustC ．CanD ．May11.—Don't smoke any more. It's bad for your health.—I'm trying to ________.It's really hard, you know.A ．turn it on A ．used to A ．put up A ．is B ．put it off C ．give it up D ．take it outC ．am used toC ．put off C ．beD ．am used forD. beenD ．give up12.I ________ get up late, but now I get up very early.B ．are used toB ．put out B. are13.Don't ________ today's work for tomorrow. Today's work must be done today.14.In our hospital, the number of women doctors ________ larger and larger.15.In some western countries, shops are closed ________ weekends.A ．inB ．toC ．atD ．with16.—A numb er of volunteers ________ willing to teach in China's rural areas.—Yes, the number is getting ________.A ．is; bigger and bigger A ．at last—Well, i t's ha rd to say. But I heard him ________ loudly when I passed by just now.A ．speak B ．to speakC ．spokenD ．speaking D ．though19.I real ly enjoyed your speech, ________ there were some parts I didn't quite understand.A ．becauseA ．everything A ．influencedB ．somethingC ．anythingD ．nothing21.He has been ________ deeply by his father.B ．influenceC ．affectD ．effect22.—Mom, I was the first to reach the top of the mountain.—Good job, Charlie. I'm ________ of you.A ．tired A ．is absent in A ．to give up A ．on B ．proudC ．sureD ．sickD ．is absent fromD ．giving upD ．out23.He ________ the office. He is having a meeting.B ．absent inC ．absent fromB ．gives up B ．inC ．gave up C ．up24.His wife advised him________ drinking, but he wouldn't.25.Tom playe d foot ball well. He used to be ________ the school team.26.Lucy ________ read story book at the age of four.A ．is able toB ．was able toC ．shouldD ．wouldB ．forC ．until20.You look worried! Is ________ all right? B ．are; bigger and bigger C ．is; more and more D ．are more and moreC ．in endD ．in least17.Here is the book and you can keep it for ________ one month.B ．at least18.—Is Tom in the next room?27.A dog is sitting in front ________ the house.A．on B．of C．to A．cool B．much cooler D．atC．hot D. more hotter28.The weath er in Guiyang in summer is ________ than that in Tongren. They're different.29.—I've s hown y ou all the interesting and important places of our school.—Thank you for ________ so much time.A．taking A．Because B．spendingB．ThoughC．costingC．AsD．having30.________ they are twins, they don't look the same at all.D．Since31. I have ___ to tell you. Maybe you will be _____ in it.A. interesting something; interestedB. something interesting; interestingC. something interesting; interestedD. something interested; interesting32.She used to____ in the morning, but now she is used to ______ at night.A. read; readB. read; readingC. reading; readD. reading; reading33.—What does the lady look like?A. She’s fine and wellB. She’s really a nice ladyC. She’s tall and thinD. She likes wearing skirts34.—Would you like to come over to my house tomorrow?—Oh,I ‘d love to . but I am afraid of your pet dog. I ____ go close to it .A. can’tB. mustn’tC. needn’tD. daren’t35.—What’s your plan for the new school year?—Oh, I am going to _____a new hobby by learning to play the guitar.A. take partB. take upC. take backD. take care36. The boss found two boys stealing his bread but he didn’t know _____A. how to do withB. what to do with themC. how to deal with itD. what to deal with37.Don’t give up! Come on. I know you can make____.A. itB. thisC. thatD. so38.Look! The monkeys are jumping _____.A. in timeB. for the first timeC. all the timeD. at times39.Every year driving after drinking wine _____ a lot of traffic accidents.A.happensB.providesC. causesD. affords40.—Jack, will your family move to Shanghai?—Yes. That’s a very big my parents made.A. decideB. decisionC. educationD. difference41.October 12th was one of day in 2019, for Shenzhou VI was sent up successfully into the space.A. excitingB. more excitingC. much excitingD. the most exciting42.—Jim became a volunteer in the 2019 Olympic Games.—______ .A. So Mary wasB. So was MaryC. So did MaryD. So Mary did43. Our life______ a lot in the last ten years.A．has changed B. have changed C. will change D. changed44. Whatever ha ppens, we shouldn’t ______ our hopes.A. put upB. cheer upC. keep upD. give up45. ______ my teachers’ help, I began to catch up with my classmates.A. WithB. UnderC. InD. To46.—Shall we go to the Century Park tomorrow—Yes, we’ll go unless it _______ heavily.A. will rainB. rainedC. was rainingD. rains47.—What do you think of my suggestion—Sorry. What’s thatI ______ about something else.A. thoughtB. am thinkingC. was thinkingD. had thought48.Lin Shuhao tried to be a good basketball player, ______ at last he succeeded.A. becauseB. andC. butD. or49. ______ joining the English club you can practice your listening skills and spoken English.A. WithB. OnC. FromD. By50.—How does Jack usually go to school—He ______ ride a bike, but now he______ there to lose weight.A. used to;is used to walkB. was used to;is used to walkingC. was used to; is used to walkD. used to; is used to walking51.—Do you know ______ the MP5 player yesterday—Sorry, I don’t know.A. how much did she pay forB. how much she paid forC. she paid for how muchD. she paid how much for52. Don’t put off today’s work till tomorrow. I mean, today’s work______ today.A. may doB. must doC. may be doneD. must be done53.I find ______ difficult to finish the work all by myself.A. thatB. it isC. itD. this12. ____ helpful advice you have given me! Thanks a lot!A. HowB. How aC. What aD. What54. Up to now the Chinese Communist Party（中国共产党）has nearly a ________history.A. 90 yearsB. 90-yearC. 90-yearsD. 90-year’s55. Some parents might think that their children’s hobbies can ________schoolwork.A. get tired ofB. get on well withC. get rid ofD. get in the way of56.Coffee is ready. It _______so nice. Would you like some, pleaseA. feelsB. is feltC. smellsD. is smelt57. Don’t worry. She is _____ to take care of little David.A. carefully enoughB. enough carefullyC. careful enoughD.enough careful58. ______ his lessons are poor, he still studies hard.A. WhenB. AsC. WhileD. Even though59. Tom thinks only of himself, he never ______ other people.A. cares aboutB. talks aboutC. tells aboutD. hears about60.— ________ do you surf the Internet— Twice a week.A. How muchB. How longC. How soonD. How often。

人教版九年级上册英语单元练习题 Unit 4 测试题

Unit 4单元测试题满分：100分时间： 90分钟一、根据句意和首字母提示补全单词。

(10分)1.Our teacher is very h ,he often tells us funny jokes.2.Lily’s teacher asked her parents to talk to her in p .3.If you are always a from class,you will fail the examinations.4.Kate’s grandparents have had a great i on her,so she is like her grandmother in many ways.5.—Paul used to be really quiet,didn’t she?—Yes. She was always s in class.6.I asked my teacher for help and he gave me a lot of h books.7.We are all p of our motherland.8.—Do you like see a movie on your mobile phone?—No.I s do that because it makes me uncomfortable.9.Finally,he made a d to tell us the secret.10.She is very shy,she doesn’t d to make a speech in public.二、用所给单词的适当形式填空。

（10分）1.She is not strong enough (go) walking up ountains.2.When I walked past the park,I saw some old pople (do) Chinese Kongfu.3.Don’t give up (study) hard. Because you are a good student.4.He was no longer interested in (study).5.Finally,his parents made a decision (send) him to a boarding school.6.He has been working hard and is now one of (good) student in his class.7.My life (change) a lot in the last few years.8.At last, he made an important (decide).9.I’m afraid of (fly) in the airplane.10.He didn’t dare (speak) in front of the people.三、根据汉语，完成英语句子。

人教部编版九年级上册第4课《你是人间的四月天》同步练习题

4你是人间的四月天基础训练一、基础积累1．下列加点字注音都正确的一项是()A．光艳．(yàn) 鲜妍．(yàn) 细．雨(xì)B．云烟．(yān)娉．婷(pīng) 鹅．黄(é)C．冠．冕(guàn) 轻灵．(líng) 浮．动(fú)D．黄昏．(hūn)柔嫩．(lèn) 呢．喃(ní)2．下列句子中加点的词语使用不正确的一项是()A．跋文细线条处有提笔快写的轻灵．．，粗线条处有按笔含锋的稳实，笔尖转折的地方精巧又飘逸……B．荷花们都沉醉在月色当中，娉婷．．地站立着，悠悠地吐着香气。

C．一个小蝴蝶展开柔嫩．．的绿翅膀，在太阳光里快乐地舞。

D．她的嗓音听来如此令人难受，像蝉的呢喃．．声顿时停止了。

3．下列诗句节奏划分有误的一项是()A．你是/四月早天里/的云烟B．轻灵/在春的光艳中/交舞着变C．百花的冠冕/你戴着D．黄昏/吹着/风的软4．请从感官角度指出下列诗句所调动的感官类型。

(1)黄昏吹着风的软()(2)是燕在梁间呢喃()(3)新鲜初放芽的绿()(4)星子在无意中闪()5．下列对本诗的理解说法有误的一项是()A．诗中采用多个比喻，意象美丽而丝毫无雕饰之嫌，反而越加衬出诗中的意境的优美和内容的纯净。

B．本诗遵循新月诗派的诗美原则：讲求格律的和谐、语言的雕塑美和音律的乐感。

C．四月的春天终将离去，黄昏后星子的“闪”让诗人心中升起一丝惆怅。

D．在诗人林徽因的笔下，人间的四月天轻盈而柔美，多姿而带着鲜艳的色彩。

二、课内阅读阅读课文，回答问题。

6．这首诗描绘了哪几幅画面？_________________________________________________________________ _________________________________________________________________ 7．第二节所选的意象有什么特点？试做具体分析。

九年级物理第十三章内能练习题 (4)-0717(解析版)

九年级物理第十三章内能练习题 (4)一、单选题1．在如图“比较水和油两种物质吸热的情况”的实验中，以下说法正确的是（）A．选用体积相等的水和食用油进行实验B．加热的时间相同，食用油的温度变化较慢C．如果它们升高相同的温度，则水吸收的热量较多D．通过比较加热时间的长短来比较吸热多少，这种方法叫控制变量法2．甲、乙两容器中装有质量相等的水，水温分别为25℃和75℃，现将一温度为85℃的金属球放入甲容器中，热平衡后水温升高到45℃，然后迅速取出金属球并放入乙容器中，热平衡后乙容器中水温为（不计热量散失和水的质量的变化）A．65℃ B．60℃ C．55℃ D．50℃3．对下列热知识的分析，正确的是A．冬天用暖手袋暖手，是通过做功的方式改变内能B．物质的比热容与物体吸收的热量、物体的质量及物体温度的变化有关C．用锯条锯木板，锯条的温度升高是由于锯条从木板中吸收了热量D．没有吸热过程和放热过程，说热量是毫无意义的4．初始温度、质量都相同的铁块和铜块（c铁＞c铜），吸收相同的热量后相接触。

则（）A．内能从铜块转移到铁块B．温度从铁块转移到铜块C．温度从铜块转移到铁块D．两者间没有发生热传递5．下列关于能量转化、转移现象的说法中，错误的是:A．电池充电，电能转化为化学能B．电动机工作，电能转化为机械能C．暖瓶塞被热气弹开，机械能转化为内能D．用热水袋取暖，内能发生了转移6．下列与分子相关的描述正确的是（）A．破镜难圆说明分子间没有引力B．花香四溢说明分子是运动的C．铁、水、空气、磁场等物质都是由大量分子组成的D．物质在固态时体积最小说明分子间没有空隙7．下列现象所反映的科学原理正确的是A．踢出去的足球继续飞行，说明足球受到惯性力的作用B．从冰箱冷冻室取食物时手常被食物粘住，说明水遇冷会凝固C．从树上掉下的苹果越落越快，说明动能会转化为势能D．长时间行驶的汽车轮胎发热，说明通过热传递能改变轮胎的内能8．下列现象中,能说明分子在不停地做无规则运动的是A．大雪纷飞B．桂花飘香C．灰尘飞舞D．烟花绽放9．下列现象中不属于熔化过程的是（）A．太阳将积雪晒化B．点燃的蜡烛不停地流着蜡烛油C．钢块投入炼钢炉后变成了钢水D．食盐投入水中，过一会儿就看不见了10．如图所示，是根据研究物质比热容实验时绘制的图象，实验中两种不同的物质质量相同，初温度相同，选用的加热器相同，根据图象可知（）A．若加热相同时间，a物质吸收的热量多，比热容小B．若吸收的热量相同，b物质温度升高的多，比热容大C．若加热时间相同，b物质的末温度高，比热容小D．若吸收的热量相同，b物质末温度低，比热容大11．关于分子，下列认识中正确的是（）A．0℃的冰块分子停止运动B．尘土飞扬，说明分子在不停地运动C．吸盘能牢牢吸在玻璃上，说明分子间存在引力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12．甲、乙两个物体的质量之比是2:3，比热容之比是1:2，当它们升高的温度相同时，吸收的热量之比是A．1:3 B．3:1 C．3:4 D．4:313．下列例子中，不能说明分子在不停地做无规则运动的是（）A．室内扫地时，在阳光下看见灰尘在空中飞舞B．晒衣服时，水蒸发，衣服变干C．卫生球放在箱里，过几天整个箱子充满了樟脑味D．把一块方糖投入一杯开水中，隔一会整杯水变甜了14．在研究物体放出热量多少跟物质种类是否有关的实验中，提供的材料：（1）0.1kg的铜块（2）0.1kg的铝块（3）0.2kg的铜块（4）0.3kg的铝块．应选用的材料是A．(1)与(2)B．(1)与(3)C．(2)与(4)D．(3)与(4)15．下列说法中，能反映物体放出的热量多少与物体降低的温度有关的是A．相同质量的同种物质，降低不同的温度，放出的热量不同B．相同质量的不同物质，降低相同的温度，放出的热量一般不同C．不同质量的同种物质，降低相同的温度，放出的热量不同D．不同质量的同种物质，降低不同的温度，放出的热量一般不同二、填空题16．如图甲所示，在一个配有活塞的玻璃筒内放一团硝化棉，用力下压活塞，硝化棉被点燃：（1）这是通过_____的方式使玻璃筒内空气的内能_____（选填“增大”或“减小”）（2）请在图乙中画出活塞下行过程中受到的摩擦力的示意图（力的作用点画在O点）．（___）17．如图甲所示，将接触面磨平的两块铅用力压紧可以使它们结合在一起，这说明分子之间存在______力。

鲁教版2020九年级数学圆周角与圆心角的关系课后练习题4(附答案)

鲁教版2020九年级数学圆周角与圆心角课后练习题4（附答案）一．选择题（共10小题）1．如图，矩形ABCD中，G是BC的中点，过A、D、G三点的圆O与边AB、CD分别交于点E、点F，给出下列说法，其中正确说法的个数是（）（1）AC与BD的交点是圆O的圆心；（2）AF与DE的交点是圆O的圆心；（3）＝；（4）DE＞DG，A．0B．1C．2D．32．如图，圆心角∠AOB＝25°，将AB旋转n°得到CD，则∠COD等于（）A．25°B．25°+n°C．50°D．50°+n°3．如图，在扇形OAB中，∠AOB＝110°，将扇形OAB沿过点B的直线折叠，点O恰好落在上的点D处，折痕交OA于点C，则的度数为（）A．40°B．50°C．60°D．70°4．如图，OA、OB、OC都是⊙O的半径，若∠AOB是锐角，且∠AOB＝2∠BOC，则下列结论正确的是（）个①AB＝2BC②＝2③∠ACB＝2∠CAB④∠ACB＝∠BOC．A．1B．2C．3D．45．如图，等腰直角三角板ABC的斜边AB与量角器的直径重合，点D是量角器上60°刻度线的外端点，连接CD交AB于点E，则∠CEB的度数为（）A．60°B．65°C．70°D．75°6．如图，点A、B、C都是圆O上的点，在四边形ABCO中，∠AOC＝140°，则∠B的度数为（）A．110°B．70°C．140°D．100°7．如图，AB为⊙O的直径，CD是⊙O的弦，∠ADC＝26°，则∠CAB的度数为（）A．26°B．74°C．64°D．54°8．如图，点A，B，C，D都在⊙O上，BD为直径，若∠A＝65°，则∠DBC的值是（）A．15°B．25°C．35°D．65°9．四边形ABCD是圆的内接四边形，若∠ABC＝70°，则∠ADC的度数是（）A．70°B．90°C．110°D．120°10．在圆内接四边形ABCD中，∠ACB＝∠ACD＝60°，对角线AC、BD交于点E．已知BC＝3，CD＝2，则线段CE的长为（）A．B．C．D．二．填空题（共10小题）11．如图，AB是⊙O的直径，已知AB＝2，C，D是⊙O的上的两点，且+＝，M是AB上一点，则MC+MD的最小值是．12．如图，在△ABC中，∠C＝90°，∠B＝22°，以C为圆心，CA长为半径的圆交AB于点D，交BC于点E，则的度数是．13．AB是⊙O的直径，C，D是上两点，且，，的比为3：2：5（，，弧长之和为），则∠AOC＝．14．如图所示，点A是半圆上一个三等分点，点B是的中点，点P是直径MN上一动点，若⊙O的直径为2，则AP+BP的最小值是．15．如图，在⊙O中，AB是直径，C是圆上一点，且∠BOC＝40°，则∠ACO＝．16．如图，已知点C是以AB为直径的半圆的中点，D为弧AC上任意一点，过点C作CE ⊥BD于点E，连接AE，若AB＝4，则AE的最小值为．17．如图，已知⊙O的半径为2，弦AB，CD所对的圆心角分别是∠AOB，∠COD，若∠AOB与∠COD互补，弦CD＝6，则弦AB的长为．18．如图，四边形ABCD内接于⊙O，连结AC，若∠BAC＝35°，∠ACB＝40°，则∠ADC ＝°．19．如图，圆内接四边形ABCD中两组对边的延长线分别相交于点E，F，且∠A＝45°，∠E＝30°，则∠F＝．20．如图，四边形ABCD为⊙O的内接四边形，若∠BOD＝150°，则∠A＝°．三．解答题（共8小题）21．如图，AB是⊙O的直径．OC，OD是半径，且OD∥AC，求证：＝．22．如图，在⊙O中，，∠B＝70°（Ⅰ）若⊙O的半径为3，求⊙O的周长（精确到0.1）；（Ⅱ）求∠A的度数．23．已知：在⊙O中，弦AB＝AC，AD是⊙O的直径．求证：BD＝CD．24．如图，⊙O中，OA⊥BC，∠AOB＝50°，求∠ADC的度数．25．如图，AB是⊙O的直径，弦CD⊥AB于点E，连接AC，BC．（1）求证：∠A＝∠BCD；（2）若AB＝10，CD＝6，求BE的长．26．如图，AB为⊙O的直径，点C在⊙O上，连接BC并延长至点D，使DC＝CB．连接DA并延长，交⊙O于另一点E，连接AC，CE．（1）求证：∠E＝∠D（2）若AB＝4，BC﹣AC＝2，求CE的长．27．已知四边形ABCD是圆内接四边形，∠1＝112°，求∠CDE．28．已知四边形ABCD内接于⊙O，∠DAB＝90°（1）如图①，若∠ACB＝60°，AB＝4，求⊙O的直径；（2）如图②，若AD≠AB，点C为弧DB的中点且AD＝m，AB＝n，求AC的长．参考答案与试题解析一．选择题（共10小题）1．如图，矩形ABCD中，G是BC的中点，过A、D、G三点的圆O与边AB、CD分别交于点E、点F，给出下列说法，其中正确说法的个数是（）（1）AC与BD的交点是圆O的圆心；（2）AF与DE的交点是圆O的圆心；（3）＝；（4）DE＞DG，A．0B．1C．2D．3【解答】解：连接DG、AG，作GH⊥AD于H，连接OD，如图，∵G是BC的中点，∴AG＝DG，∴＝；∴HG⊥AD，∵OG＝OD，∴点O不是HG的中点，∴圆心O不是AC与BD的交点；而四边形AEFD为⊙O的内接矩形，∴AF与DE的交点是圆O的圆心；∵∠DAB＝90°，∴DE是⊙的直径，∴DE＞DG，∴（1）错误，（2）（3）（4）正确．故选：D．2．如图，圆心角∠AOB＝25°，将AB旋转n°得到CD，则∠COD等于（）A．25°B．25°+n°C．50°D．50°+n°【解答】解：∵将AB旋转n°得到CD，∴＝，∴∠COD＝∠AOB＝25°，故选：A．3．如图，在扇形OAB中，∠AOB＝110°，将扇形OAB沿过点B的直线折叠，点O恰好落在上的点D处，折痕交OA于点C，则的度数为（）A．40°B．50°C．60°D．70°【解答】解：连结OD，如图，∵扇形OAB沿过点B的直线折叠，点O恰好落在上的点D处，折痕交OA于点C，∴BC垂直平分OD，∴BD＝BO，∵OB＝OD，∴△OBD为等边三角形，∴∠DOB＝60°，∴∠AOD＝∠AOB﹣∠DOB＝110°﹣60°＝50°，∴的度数为为50°，故选：B．4．如图，OA、OB、OC都是⊙O的半径，若∠AOB是锐角，且∠AOB＝2∠BOC，则下列结论正确的是（）个①AB＝2BC②＝2③∠ACB＝2∠CAB④∠ACB＝∠BOC．A．1B．2C．3D．4【解答】解：取的中点D，连接AD，BD，∵∠AOB＝2∠BOC，∴＝2，故②正确，∴＝＝，∴AD＝BD＝BC，∵AB＜AD+BD，∴AB＜2BC．故①错误，∵∠AOB＝2∠BOC，∠BOC＝2∠CAB，∴∠AOB＝4∠CAB，∵∠AOB＝2∠ACB，∴∠ACB＝∠BOC＝2∠CAB，故③④正确．故选：C．5．如图，等腰直角三角板ABC的斜边AB与量角器的直径重合，点D是量角器上60°刻度线的外端点，连接CD交AB于点E，则∠CEB的度数为（）A．60°B．65°C．70°D．75°【解答】解：如图，∵一块直角三角板ABC的斜边AB与量角器的直径重合，∴点A、B、C、D都在以AB为直径的圆上，∵点D是量角器上60°刻度线的外端点，即∠BOD＝120°，∴∠BCD＝∠BOD＝60°，∴∠CEB＝180°﹣∠BCD﹣∠ABC＝75°．故选：D．6．如图，点A、B、C都是圆O上的点，在四边形ABCO中，∠AOC＝140°，则∠B的度数为（）A．110°B．70°C．140°D．100°【解答】解：如图所示，在优弧AOC上取一点D，连接AD，CD，∵∠AOC＝140°，∴∠ADC＝70°，∵四边形ABCD是圆内接四边形，∴∠B＝180°﹣70°＝110°．故选：A．7．如图，AB为⊙O的直径，CD是⊙O的弦，∠ADC＝26°，则∠CAB的度数为（）A．26°B．74°C．64°D．54°【解答】解：由圆周角定理得，∠ABC＝∠ADC＝26°，∵AB为⊙O的直径，∴∠ACB＝90°，∴∠CAB＝90°﹣∠ABC＝64°，故选：C．8．如图，点A，B，C，D都在⊙O上，BD为直径，若∠A＝65°，则∠DBC的值是（）A．15°B．25°C．35°D．65°【解答】解：∵BD为直径，∴∠BCD＝90°，由圆周角定理得，∠D＝∠A＝65°，∴∠DBC＝90°﹣65°＝25°，故选：B．9．四边形ABCD是圆的内接四边形，若∠ABC＝70°，则∠ADC的度数是（）A．70°B．90°C．110°D．120°【解答】解：∵四边ABCD是圆的内接四边形，∠ABC＝70°，∴∠ADC＝180°﹣70°＝110°．故选：C．10．在圆内接四边形ABCD中，∠ACB＝∠ACD＝60°，对角线AC、BD交于点E．已知BC＝3，CD＝2，则线段CE的长为（）A．B．C．D．【解答】解：作BM⊥AC于M，DN⊥AC于N，如图所示：则BM∥DN，∴△BME∽△DNE，∴＝，∵∠ACB＝∠ACD＝60°，∴∠CBM＝∠CDN＝30°，∴CM＝BC＝，CN＝CD＝，∴BM＝CM＝，DN＝＝，∴MN＝CM﹣CN＝，∴＝，∴EN＝MN＝，∴CE＝CN+EN＝+＝；故选：C．二．填空题（共10小题）11．如图，AB是⊙O的直径，已知AB＝2，C，D是⊙O的上的两点，且+＝，M是AB上一点，则MC+MD的最小值是．【解答】解：过D作DD′⊥AB于H交⊙O于D′，∴＝，∵+＝，∴+＝，∴∠COD′＝120°，连接CD′交AB于M，则CD′＝MC+MD的最小值，过O作ON⊥CD′于N，∵OC＝OD′，∴CD′＝2NC，∠C＝30°，∵OC＝AB＝1，∴CN＝，∴CD′＝，∴MC+MD的最小值是，故答案为：．12．如图，在△ABC中，∠C＝90°，∠B＝22°，以C为圆心，CA长为半径的圆交AB于点D，交BC于点E，则的度数是46°．【解答】解：连接CD，∵∠C＝90°，∠B＝22°，∴∠A＝90°﹣22°＝68°，∵CD＝CA，∴∠CDA＝∠A＝68°，∴∠ACD＝44°，∴∠BCD＝90°﹣44°＝46°，∴的度数是46°，故答案为：46°．13．AB是⊙O的直径，C，D是上两点，且，，的比为3：2：5（，，弧长之和为），则∠AOC＝54°．【解答】解：∵，，的比为3：2：5（，，弧长之和为），∴∠AOC：∠COD：∠BOD＝3：2：5，∴∠AOC＝×180°＝54°．故答案为54°．14．如图所示，点A是半圆上一个三等分点，点B是的中点，点P是直径MN上一动点，若⊙O的直径为2，则AP+BP的最小值是．【解答】解：作点B关于MN的对称点B′，连接AB′交MN于点P，连接BP，此时AP+BP＝AB′最小，连接OB′，如图所示．∵点B和点B′关于MN对称，∴PB＝PB′．∵点A是半圆上一个三等分点，点B是的中点，∴∠AON＝180°÷3＝60°，∠B′ON＝∠AON÷2＝30°，∴∠AOB′＝∠AON+∠B′ON＝90°．∵OA＝OB′＝1，∴AB′＝．故答案为：．15．如图，在⊙O中，AB是直径，C是圆上一点，且∠BOC＝40°，则∠ACO＝20°．【解答】解：∵∠BOC＝40°，∴∠A＝∠BOC＝20°，∵OA＝OC，∴∠ACO＝∠A＝20°．故答案为：20°．16．如图，已知点C是以AB为直径的半圆的中点，D为弧AC上任意一点，过点C作CE ⊥BD于点E，连接AE，若AB＝4，则AE的最小值为﹣．【解答】解：连接OC、BC，P点为BC的中点，作PH⊥AB于H，如图，∵点C是以AB为直径的半圆的中点，∴OC⊥OB，∴△BOC、△BPH为等腰直角三角形，∴BC＝OB＝2，BP＝，PH＝1，∵CE⊥BD，∴∠BEC＝90°，∴点E在⊙P上，连接AP交⊙P于E′，此时AE′的长为AE的最小值，在Rt△APH中，AH＝3，PH＝1，∴AP＝＝，∴AE′＝﹣，∴AE的最小值为﹣．故答案为﹣．17．如图，已知⊙O的半径为2，弦AB，CD所对的圆心角分别是∠AOB，∠COD，若∠AOB与∠COD互补，弦CD＝6，则弦AB的长为2．【解答】解：把∠COD饶点O顺时针旋转，使点C与D重合，∵∠AOB与∠COD互补，∴∠AOD＝180°∵⊙O的半径为2，∴AD＝4，∵弦CD＝6，∠ABD＝90°，∴AB＝＝2．故答案是：2．18．如图，四边形ABCD内接于⊙O，连结AC，若∠BAC＝35°，∠ACB＝40°，则∠ADC ＝75°．【解答】解：∠ABC＝180°﹣∠BAC﹣∠ACB＝105°，∵四边形ABCD内接于⊙O，∴∠ADC＝180°﹣∠ABC＝75°，故答案为：75．19．如图，圆内接四边形ABCD中两组对边的延长线分别相交于点E，F，且∠A＝45°，∠E＝30°，则∠F＝60°．【解答】解：∵四边形ABCD是圆内接四边形，∴∠BCD＝180°﹣∠A＝135°，有三角形的外角性质可知，∠EDC＝∠BCD﹣∠E＝105°，∴∠F＝∠EDC﹣∠A＝60°，故答案为：60°．20．如图，四边形ABCD为⊙O的内接四边形，若∠BOD＝150°，则∠A＝105°．【解答】解：∵∠BOD＝150°，∠BOD＝2∠C∴∠C＝75°∵四边形ABCD为⊙O的内接四边形，∴∠A+∠C＝180°∴∠A＝105°故答案为：105三．解答题（共8小题）21．如图，AB是⊙O的直径．OC，OD是半径，且OD∥AC，求证：＝．【解答】证明：∵OA＝OC，∴∠OCA＝∠A，∵OD∥AC，∴∠BOD＝∠A，∠COD＝∠OCA，∴∠COD＝∠BOD，∴＝．22．如图，在⊙O中，，∠B＝70°（Ⅰ）若⊙O的半径为3，求⊙O的周长（精确到0.1）；（Ⅱ）求∠A的度数．【解答】解：（Ⅰ）∵⊙O的半径为3，∴⊙O的周长＝2×π×3≈18.8；（Ⅱ）∵，∴∠C＝∠B＝70°，∴∠A＝180°﹣∠C﹣∠B＝40°．23．已知：在⊙O中，弦AB＝AC，AD是⊙O的直径．求证：BD＝CD．【解答】证明：∵AB＝AC，∴＝，∴∠ADB＝∠ADC，∵AD是⊙O的直径，∴∠B＝∠C＝90°，∴∠BAD＝∠DAC，∴＝，∴BD＝CD．24．如图，⊙O中，OA⊥BC，∠AOB＝50°，求∠ADC的度数．【解答】解：∵⊙O中，OA⊥BC，∴＝，∴∠ADC＝∠AOB＝×50°＝25°．25．如图，AB是⊙O的直径，弦CD⊥AB于点E，连接AC，BC．（1）求证：∠A＝∠BCD；（2）若AB＝10，CD＝6，求BE的长．【解答】（1）证明：∵直径AB⊥弦CD，∴弧BC＝弧BD．∴∠A＝∠BCD；（2）连接OC∵直径AB⊥弦CD，CD＝6，∴CE＝ED＝3．∵直径AB＝10，∴CO＝OB＝5．在Rt△COE中，∵OC＝5，CE＝3，∴OE＝＝4，∴BE＝OB﹣OE＝5﹣4＝1．26．如图，AB为⊙O的直径，点C在⊙O上，连接BC并延长至点D，使DC＝CB．连接DA并延长，交⊙O于另一点E，连接AC，CE．（1）求证：∠E＝∠D（2）若AB＝4，BC﹣AC＝2，求CE的长．【解答】（1）证明：∵AB为⊙O的直径，∴∠ACB＝90°，即AC⊥BC，∵DC＝CB，∴AD＝AB．∴∠B＝∠D，∵∠E＝∠B，∴∠E＝∠D；（2）解：∵∠E＝∠D，∴DC＝CE，∵DC＝CB，∴CB＝CE，在Rt△ABC中，AC2+BC2＝AB2，即（BC﹣2）2+BC2＝42解得，BC1＝1+，BC1＝1﹣（舍去），∴CE＝1+，即CE的长为1+．27．已知四边形ABCD是圆内接四边形，∠1＝112°，求∠CDE．【解答】解：由圆周角定理得，∠A＝∠1＝56°，∵四边形ABCD是圆内接四边形，∴∠CDE＝∠A＝56°．28．已知四边形ABCD内接于⊙O，∠DAB＝90°（1）如图①，若∠ACB＝60°，AB＝4，求⊙O的直径；（2）如图②，若AD≠AB，点C为弧DB的中点且AD＝m，AB＝n，求AC的长．【解答】解：（1）如图，连接BD，∵∠DAB＝90°∴BD是直径，∵∠DAB＝90°，∠ACB＝∠ADB＝60°，AB＝4，∴sin∠ADB＝∴DB＝＝8∴⊙O的直径为8（2）如图，连接BD，过点D作DE⊥AC于点E，∵∠DAB＝90°∴BD是直径，∴∠BCD＝90°∵点C为弧DB的中点∴∠DAC＝∠CAB＝45°∴CD＝BC，∴DB＝CD∵∠DCA＝∠ABD，∠DEC＝∠DAB＝90°∴△DEC∽△DAB∴∴＝∴DE＝m，EC＝n，∵∠DAC＝45°，DE⊥AC∴AE＝DE＝m∴AC＝AE+EC＝m+n。

九年级化学第四单元练习题

第四单元练习题一、选择题1.下列物质的用途，所利用的性质与另外三种有根本区别的是A．氢气用于填充气球B．干冰用于人工降雨C．镁粉用做烟花和照明弹D．铜丝用做电线2.以下是空气污染指数与质量级别、质量状况的对应关系：空气污染指数0～5051～100101～200201～300＞300空气质量状况优良轻度污染中度污染重度污染空气质量级别I II III IV V的空气质量级别和空气质量状况分别是A．I级优B．II级良C．III级轻度污染D．V级重度污染3.《京都议定书》于2月16日正式生效，它的核心内涵是：减少温室气体的排放量，以控制全球的气候变暖。

导致温室效应的主要气体是A．二氧化碳B．氧气C．氮气D．氢气4.燃烧柴禾时，通常把柴禾架空一些，才能燃烧得更旺，这是因为A．散热的速度加快B．聚集的热量增加C．柴禾的着火点降低D．柴禾与空气的接触面积增大5.某溶质溶解在水中，形成的溶液与水相比较，一定不会改变的是A．沸点B．导电性C．颜色D．水分子的构成24、甜蜜素[C6H12O3NSNa]是一种甜味添加剂，下列有关甜蜜素的说法正确的是（）A、它属于糖类B、其中C、H、O元素的质量比为6：1：4C、它由五种元素组成D、它的相对分子质量为20010.有些年轻人喜欢染发，染发时一般要用到一种着色剂—对苯二胺，它是一种有毒的化学药品，有致癌性，会对染发者的身体带来伤害，其分子结构如图所示。

下列有关对苯二胺的说法不正确的是A.对苯二胺的化学式为CAN,B.对苯二胺的相对分子质量（式量）为108C.对苯二胺中碳、氢、氮元素的质量比为3: 4: 1D.对苯二胺能被皮肤少量吸收25.“物质的结构决定性质，物质的性质决定用途”是自然科学的重要思想。

过氧化氢是一种常用的杀菌消毒剂，其原因是过氧化氢分子中含有一种叫“过氧基”的结构（方框框出部分）。

据此推测下列物质中，可作杀菌消毒剂的是16．“亮菌甲素”化学式为C12H10O5，是黄色或橙黄色结晶粉末，几乎不溶于水，辅料丙二醇(C3H8O2)溶成针剂用于临床。

新目标九年级上册英语Unit4基础知识练习题及答案

新目标九年级上册英语Unit4基础知识练习题及答案一、用所给词的适当形式填空(5分)1. To(we)surprise, he got an A in the English exam.2. Parents should let their children make their own(decide).3. The teachers are always(pride)of everything good the students do.4. The girl has really(change). Now she is hard-working at all her subjects.5. Can you hear her(introduce)clearly?二、完成句子（10分）1.即使下雨了, 我们也必须外出。

it was raining, we had to go out.2.你为什么总要惹麻烦?Why do you always ?3.使我感到吃惊的是, 这次谈话改变了她的生活。

, the conversation changed her life.4.我将努力地帮他自信起来。

I’ll try to help him himself.5.老师对文章内容作了简要介绍。

The teacher about the passage.三、根据句意及汉语提示填写单词。

（10分）1.Mr.Lee is very friendly and ________(富于幽默感的).We all like him very much.2.Look！There are some ________(蚂蚁) climbing the tree.3.He has an ________(面试) next Monday for the manager's job.4.Don't read my ________(私人的)letters unless I agree.5.I don't like the ________(背景).Please change another one.6.I asked my teacher for help and he gave me a lot of h books.7.We are all p of our motherland.8.—Do you like see a movie on your mobile phone?—No.I s do that because it makes me uncomfortable.9.Finally,he made a d to tell us the secret.10.She is very shy,she doesn’t d to make a speech in public.四、句型转换（10分）1. The boy used to give his mother many problems. (改为否定句)The boy________ ________ ________ give his mother many problems.2. We all take pride in that player. (改为同义句)We ________ all ________ ________ that player.3. He used to be afraid of being alone. (改为一般疑问句)________ he ________ ________ be afraid of being alone?4. He no longer works in that company. (改为同义句)He ________ ________ in that company________.5. The boy has really changed, ________ ________？(补充附加疑问句)五、单项选择（15分）( )1．It's foolish of you to give up ________ the violin.A．playing B．to play C．play D．played ( )2．—Is Paul still afraid of high places?—________.A．I think so B．I don't agree C．I hope so D．I don't mind ( )3．—What ________ the number of the students in your school?—About two thousand. A number of them ________ from the countryside. A．is；are B．is；is C．are；is D．are；are ( )4．Linda used ________ short，________ she?A．be；didn't B．be；didC．to be；didn't D．to be；did( )5．—Danny，would you please ________ my dog when I am away?—No problem.A．look up B．look like C．look on D．look after ( )6.I don’t want to you. You must decide what to do by yourself. A.help B.influence C.ask D.refuse( )7.Please don’t talk about problems in public. It’s impolite.A.seriousB.privateC.creativeD.convenient( )8.I go for a row on the lake.A.am usedB.am used toed toed( )9.—Mr.Green is really good at telling jokes. This makes him a popular teacher.—You’ve got the point. Students all like teachers.A.kindB.carefulC.humorousD.polite( )10.The girl the dark. She can’t get out at night.A.is interested inB.is glad aboutC.is afraid ofD.is angry with( )11. Her illness has a(n) ________ on her schoolwork and she didn't pass the exam that time.A. prideB. influenceC. generalD. worry( )12. Liu Mei is ________ girl. She's very happy at school.A. a eight－year－oldB. a eight－years－oldC. an eight－year－oldD. an eight－years－old( )13. —I didn't know you go to school by taxi.—Oh, I ________ take a taxi to school, but my bike needs repairing.A. alwaysB. sometimesC. oftenD. seldom( )14. I can't tell ________ when the house was built, but it must be very old.A. exactlyB. differentlyC. quicklyD. simply( )15. After the operation he couldn't eat what he liked，________ he was very hungry.A. even thoughB. becauseC. so thatD. hardly ever六、词与短语填空(10分)1. The writer's new book has millions of teenagers.2. Nobody school though it rained heavily yesterday.3. Could you please give me an of your family?4. The opinion is that the meeting was a success.5. I passed the exam of history but the exam of chemistry.七、完形填空(共10分)Last Friday, I met an old friend of mine in the supermarket. We haven't seen each other __1__ three years ago. She has __2__ a lot. She __3__ very fat and always __4__ a pair of glasses. But now, she is very thin and the glasses are gone. She __5__ so beautiful with big eyes and long blond hair—it used to be short and brown. She used to be very silent and was __6__ of speaking in public. Now she is humorous and she told me she was __7__ her school volleyball team and played __8__ piano. She said she hoped I could go to see her performance __9__. She looks so confident and I know she isn't what she used to be __10__.( )1. A. in B. for C. since D. with( )2. A. changed B. been changed C. turned D. become( )3. A. used to B. was used to be C. used to be D. was used to being ( )4. A. wear B. wore C. put on D. dressed( )5. A. sounds B. was like C. looks D. looked( )6. A. afraid B. fond C. ready D. dare( )7. A. with B. for C. at D. on( )8. A. the B. a C. / D. some( )9. A. every day B. sometimes C. some day D. some time( )10. A. no more B. no longer C. not anymore D. anymore八、根据短文内容及所给提示,然后用适当单词或所给单词的适当形式填空（10分）Last Sunday, I interviewed an Asian singer, Emily. She told me something 1____(humor) about herself.She said she came from a working-class background. She used to be shy and silent. She seldom made a speech 2____ public. She didn’t 3____(exact) dare to do anything in person. She was even afraid of ants, a kind of little insects.All these 4____(influence) her in her boarding school. She often failed her 5____(examine) and she was absent from school 6____ time to time. As a result, her test scores were lower.Now she has changed a lot. She dares to deal with her 7____(shy). And she has made many friends, such as an African girl, 8____ European boy and a British man.They are all helpful to her. She doesn’t need any introduction in front of crowds, and she gets tons of attention everywhere she goes. In general, she 9____(require) her private guards around her when she goes out. Her parents take 10____(pride) in her and she is also proud of herself now.九、阅读理解（20分）AI used to skate a lot. With every Olympic song, I found an excitement growing inside me when I was first to skate at the age of five. But, unluckily, I was badly hurt in a match. I quickly stopped my skating. Smiling, my husband just said, “Skating is your passion (酷爱)，but of course we can stay at home.”It was crazy, I know, that a thirty-seven-year-old mother of two children wanted to skate under disco ball lights after 10 years. I found the excitement growing inside me. I loved to skate. So I was out there having the time of my life, listening to the music with a smile on my face and heart. I hoped I could skate again.I belonged here. It was so right to be back on the ice.“Did you use to be a skater？” A little girl looked up at me with questioning eyes. Taking time to give my answer, I looked around the rink (溜冰场)，where I could see so many years of lessons, Olympic dreams, and a love of the ice would never die.“No，” I answered，“I'm a skater.” With a smile, I glided away.Skating had finally turned me into a champion—a winner of a lifelong passion for favorite sport.( )1.Why did the writer have to stay at home?A. Because she was hurt.B. Because her husband didn't want her to skate.C. Because she had to look after her children.D. Because she didn't love skating any longer.( )2.The writer first started to skate ________ years ago.A.5B.10C.27D.32( )3.The writer went back to skate because ________.A. she wanted to be a champion of the OlympicB. she loved skating very muchC. she wanted to make a lot of moneyD. she didn't love to stay at home( )4.The Chinese meaning of the underlined word “glided” is “ ________ ”.A.滑走B.消逝C.旋转D.跑步( )5.For the writer，________ has come true.A. to be a winner among all the skatersB. to be a champion of the OlympicC. to be a good motherD. to win the lifelong passionBI'm not much of a crier most of the time. But recently when I was reading a book on a plane, I started crying. Of course, it came as a big surprise when tears came up. No matter how hard I tried, wasn't able to control myself.Oh no, not this now. I thought to myself. But even as the thought entered my brain, I felt the first hot drop of salty water coming down my face. I put my head down,hoping that I could go on reading.In fact, the harder I tried, the more tears pushed their way out of my eyes. You could guess how surprised the man next to me looked.I dropped my head in shame. He must think I was crazy. May be I could turn toward him, hold up the cover of the book and say in my crying voice. “I'm sorry, sir.It's just a really good book!”But I didn't say anything. Instead, I just put my head back against the seat and let the tears run.Do you know what decision I made while I was crying? My decision was that it was okay if he thought I was crazy. I'd rather be crazy than be the kind of person who wouldn't cry when the situation called for it, or who wouldn't let herself feel anything at all.I've been that girl who has spent so much time trying to make sure people didn't think I was crazy. But now I don't want to be that girl anymore—— that bored and sad girl. I'd rather be this girl who is able to forgive(原谅), love and act, even if it means being disappointed or being hurt again and again.( )6. The writer started crying becauseA. she is usually a crierB. she is kind of crazyC. she was moved by the bookD. she felt uneasy on the plane( )7. When tears came up, the writer at firstA. thought deeplyB. went on readingC. tried to control herselfD. explained to the man beside her( )8. As tears got out of her eyes, the writer did NOT .A. drop her head shamefullyB. think about others' feelingsC. put her head against the seatD. say sorry to anyone in a crying voice( )9. According to the passage, we know the writer .A. decided to change herself bravelyB. lived a sad and boring lifeC. wouldn't cry in any terrible situationD. wouldn't let others feel anything at all( )10. The passage mainly tells us .A. why the writer cried hard on the planeB. how the writer tried to stop herself cryingC. what the writer thought about while she criedD. how the writer overcame herself and decided to change参考答案一、1. our 2. decision 3. proud 4. changed 5. introduction二、1.Even though 2.make/cause trouble3.To my surprise 4.feel good about5.gave a general introduction三、1.humorous 2.ants 3.interview 4.private 5.background6.helpful7.proud8.seldom9.decision 10.dare四、1. didn't use to/used not to 2. are; proud of3.Did; use to4. doesn't work; anymore5. hasn't he五、1-5AAACD 6-10BBCCC 11－15 BCDAA六、1. influenced 2. was absent from 3. introduction 4. general 5. failed七、1—5 CACBC6—10 ADACD八、.1.humorous 2.in 3.exactly 4.influenced 5.examinations 6.from7.shyness8.a 9.requires10.pride九、1－5ADBAD 6—10 CCDAD。

九年级人教版版英语Unit 4单元练习(有答案)

九年级人教版版英语Unit 4单元练习一、单项选择题：( )1. - Are you going to Beijing for the summer holiday next week?- Yes. But I haven’t got the air tickets and don’t know we will set out.A. howB. whereC. whenD. what( )2.There are floors in the building and my home is on the floor.A. twenty; fifteenthB. twenty; fifteenC. twentieth; fifteenD. twentieth; fifteenth( )3. - Was Eric’s father very strict with him?- Yes. He never praised him he became one of the top students in his grade.A. sinceB. whenC. untilD. because( )4. - Excuse me, could you tell me?- Sure. There’s a post office at the first crossing.A. where ’s a post officeB. where I can buy some stampsC. is there a post office near hereD. how far ’s a post office( )5. - Does my question sound enough?- I don’t think so. You can ask more by using “could” instead of “can”.A. politely; politelyB. politely; politeC. polite; politelyD. polite; polite ( )6. — Mr Lee is really good at telling jokes. This makes him a popular teacher.—You’ve got the point. Students all like teachers.A. kindB. carefulC. humorousD. polite( )7. — You should say sorry to your father for the mistake you made, Tom.—I don’t to meet his eyes. What if he gets angry with me?A. needB. haveC. refuseD. dare( )8. — Guangzhou Evergrande is really a super team in Asia.— Yes. We were so when they won the Asian Champions League.A. proudB. afraidC. surprisedD. worried( )9. — Mr Lee said he teaching English because he loved children.— Yes. And his love for children and teaching makes him a great teacher.A. turned upB. gave upC. took upD. set up ( )10. —I have got used to living in this city. But I still miss my old friends in Taiyuan .— Old friends are best, right?A. in timeB. at the same timeC. from time to timeD. on time ( )11.I used to play soccer and I was the soccer team .A / , inB the , onC a , onD / , on( )12.His teacher advised his parents with their son .A talkB talkingC talkedD to talk( )13.—you take a bus to school ?—Yes . But now I usually walk to school .A Did , use toB Were , used toC Do , use t oD Do, used to（）14.He won’t dare his promise .A breakB to breakC breakingD breaks( )15.I saw him to the shop with his cousin just now .A goesB goC to goD went二、完形填空：People succeed and people fail. Some say nothing is 1 while some say they can’t. I believe where there is a will, there is a(n) 2 . If we work hard, we will succeed one day. I am 3 because Mr “I can’t” has been forgotten by me.I will never 4 the day when I, a primary school student of Grade 3, together with my classmates buried (埋葬) Mr “I can’t”. 5 that day, our teacher asked us to write down all the things that we couldn’t 6 . We all did as she told us to. In a moment, our papers were 7 with a lot of “I can’ts”. Then we were told to fold the papers and hand them in. She put 8 in a box and led us to the farthest corner of the playground. She then asked us to dig a hole (挖洞) and bury the box. We couldn’t 9 her until she said “Goodbye, Mr ‘I can’t’”. Then she asked us to remember the day, to be confident and to decide our own future.The lesson has left a(n) 10 impression (印象) on me. It makes me understand that one should have the courage to say goodbye to Mr “I can’t” and be self-confident if he wishes to achieve his dreams.( )1. A. successful B. impossible C. necessary D. important ( )2. A. way B. idea C. dream D. circle( )3.A. tired B. poor C. relaxed D. confident( )4. A. miss B. change C. forget D. remember( )5. A. On B. With C. In D. At( )6. A. make B. read C. do D. reply( )7. A. agreed B. cut C. discovered D. covered( )8. A. it B. that C. them D. theirs( )9. A. meet B. understand C. see D. refuse( )10. A. deep B. different C. wrong D. opposite三、阅读理解：AWhat problems do the teenagers probably have? Here is a survey showing theirA. Four.B. Five.C. Six.D. Seven.( ) 2. What problems are caused by too much homework?A. Feeling stressed and fighting with each other.B. Feeling tired of study and getting fat.C. Feeling stressed and getting short-sighted.D. Getting short-sighted and feeling tired of study.( ) 3. If Simon is feeling stressed, he should .A. do much more homeworkB. make a plan to spend time on study and hobbiesC. donate his pocket money to Project HopeD. buy some snacks( ) 4. peter is tired of study, maybe because he .A. has no close friendsB. has no pocket moneyC. plays too many computer gamesD. gets fatter and fatter( ) 5. is a good way for the teenagers to stop fights.A. Doing less homeworkB. Playing computer gamesC. Learning how to make friendsD. Paying no attention to each otherBWhere is Love? How can we find Love?Once a little boy wanted to meet Love. He knew it was a long trip to where Love lived, so he got his things ready with some pizzas and drinks and started off. When he passed three streets, he saw an old woman sitting in the park and watching some birds. She looked very hungry. The boy gave her a pizza. She took it and smiled at him. The smile was so beautiful that he wanted to see it again, so he gave her a Coke. She smiled once again. The boy was very happy.They sat there all the afternoon, eating and smiling, but they said nothing. When it grew dark, the boy decided to leave. But before he had gone more than a few steps, he turned around, ran back to the old woman and gave her a hug. The woman gave him her biggest smile ever.When the boy opened the door of his house, his mother was surprised by the look of joy on his face and asked what had made him so happy. “I had lunch with Love. She has got the most beautiful smile in the world.” At the same time, the old woman,s son was also surprised at his mother,s pleasure and asked why.“I ate a pizza in the park with Love,” she said, “and he is much younger than I expected.”If the world is full of love, we can enjoy a better life.( )6.When the little boy saw the old woman, she was .A. looking for a seat in the parkB. passing the streetC. looking at some birdsD. having a pizza( )7.The little boy gave the old woman a Coke because .A. the old woman still felt hungryB. he wanted to see the smile againC. he didn,t like the drinkD. the old woman paid him for it ( )8.The old woman gave the little boy the biggest smile .A. after the little boy went homeB. before it grew darkC. when she was drinking CokeD. after the little boy hugged her ( )9.The boy’s mother was surprised to see her son was very when the door opened.A. pleasedB. sadC. unhappyD. angry( )10.Which of the following is TRUE?A. The little boy failed to find Love.B. Both the little boy and the old woman found what they wanted at last.C. The little boy decided never to go home.D. The old woman gave the little boy a hug to thank him.四、词汇运用：1.If you don’t study hard , you may f the examination .2.My advice has no i on his action .3.Mary hates swimming , so she s goes swimming with her friends .4.The boy got a full score in the exam . His parents were p of him .5.The woman was ill , so she was a from the meeting .6 .I used to _________ (get) up late. But now. I’m used to________ (get)up early.7. We_________ (know) each other since two years ago.8.It_________(be) 3 years since we came here.9. Mike is ___________(outgoing) than Jim.10. He’s ____________(interest) in_________ (play) computer games.五、句型转换1. You used to have long straight hair.（改为否定句）You ________ ________ ________ have long straight hair.2 Mrs. Green doesn’t work here any longer. (改为同义句)Mrs. Green ________ _______ works here.3 Steve is interested in collecting kites. (对划线部分提问)_______ ________ Steve interested in?4 I used to go to school by bike. (对划线部分提问)________ _______ you use to go to school?5 She has hardly had anything this morning.（改为反意疑问句）She has hardly had anything this morning, _________ _________?六、补全对话（七选五）：A: Excuse me, 1.__________________?B: No, there isn’t. The nearest bookshop is Wang Fujing Bookshop, about 5 kilometres away from here.A: 2.__________________, I think.B: Yes. 3.___________________and get off at Dongdan bus stop.A: Is the bookshop near the bus stop?B: Yes, when you get off the bus, walk along the street and turn right at the first traffic lights. 4.__________________ then you can find it on your right hand.A: I see. 5. ____________________ .B: You’re welcome.备选答案：A. Go on walkingB. It’s farC. Where’s the bookshopD. You’d better take a busE. How far is it from hereF. Thank you very muchG. Is there a bookshop near here七、书面表达陈红原来是一个腼腆内向（Shy and introverted）的学生，在学校参加了一个Buddy Club, 从那以后，她改变了很多。

人教版英语九年级上册Unit4单元练习题(有答案)

Unit4 I used to be afraid of the dark.单元练习题一、根据中文提示写单词1.2.3.4.5.6.7.8.9.10.二、用所给单词的适当形式填空1.2.3.4.5.6.7.8.9.10.三、单项选择题1.My parents _____ go to visit my grandparents these days because they are too busy, so they feel very sorry.uallyB.alwaysC.seldom2.Boys and girls, work hard. I'm sure your parents will _____ you in the future.A.be famous asB.be proud ofC.keep in touch3.—Who is the person you admire the most?—Qian Xuesen, the Father of China's Missiles. He is the _____ of China.A.leaderB.prideC.voice4."One Belt, One Road" will have a great _____ on the trade between China and European countries.A.influenceB.decisionC.conversation5.Nowadays China has made great achievements in many fields. We really _____ our amazing China.A.take pride inB.take care ofC.take an interest in6.Grace often gets nervous before she gives a speech _____.A.in publicB.in totalC.in common7.—How do you _____ your clothes which are smaller for you?—I will wash them and give them away to the kids in poor areas.A.depend onB.deal withC.care about8.After watching Chinese Poetry Conference on TV, I felt so _____ to be Chinese.A.peacefulB.patientC.proud9.The boy wasn't feeling well at that time. Strange thoughts and worries were _____ his mind.A.turningB.crowdingC.forming10.Black holes are some of the strangest and most fascinating objects found in outer. And the photos from the group of scientists _____ proved this.A.patientlyB.hardlyC.exactly四、语法填空It's believed that because of some inventions, our life has become much easier than it _____ (use) to be. I saw a website last week. The pioneers of different inventions _____ (list) there. For example, it mentioned that the zipper _____ (invent) by Whitecomb Judson in 1893. But at that time, it _____ (not) used widely. It didn't become popular _____ 1917. Now it is used in our_____ (day) lives and you can see zippers on dresses, trousers, shoes, bags… almost everywhere! _____ was the telephone invented? In 1876 by Alexander Graham Bell. How about cars? _____ cars invented before the telephones? No, they were invented in 1885. Do you know that tea, the most popular drink in the world (after water), was invented by _____ (accidental)? It is _____ (say)that Shen Nong was the first to discover tea as a drink..五、翻译下列句子1.我过去常常前害怕黑暗.______________________________________________________________________________ 2. 我开着卧室的灯睡觉______________________________________________________________________________ 3.以前我常常花很多时间和我的朋友们玩游戏.______________________________________________________________________________ 4.我几乎没有时间去听音乐会_______________________________________________________________________________ 5.我的生活在过去几年里改变了很多.______________________________________________________________________________ 6.那会使你紧张的._____________________________________________________________________________ 7.玉梅似乎变化很大.______________________________________________________________________________ Unit4 I used to be afraid of the dark.单元练习题答案一、根据中文提示写单词1. fail2. guard3. humourous4. exactly5. silent6.private7. background8. introduction9. ants 10. helpful二、用所给单词的适当形式填空1. helpful2. silent3. influence4. humourous5. examination6. European7. introduction8. exactly9. Asian 10. guards三、单项选择题1-5 CBBAA 6-10 ABCCC四、语法填空1. used2. were listed3. was invented4. was not5. until6. daily7. When8. Were9. accident 10. said五、翻译下列句子1. I used to be afraid of the dark.2. I sleep with the bedroom light on.3. I used to spend a lot of time playing games with my friends.4. I hardly have time to go to the concert.5. My life has changed a lot in the past few years.6. That'll make you nervous.7. Yumei seems to have changed a lot.。

九年级Unit4IusedtobeafraidofthedarkUnit4练习题

Unit 4练习题一、单项选择（10分）( ) 1. I am used to _____ a T-shirt and jeans.A. wearB. put onC. wearingD. putting on( ) 2. Tina used to ________ to work, but she is used to ________ to work now.A. riding a bike, taking a busB. riding a bike, take a busC. ride a bike, taking a busD. ride a bike, take a bus( ) 3. Yao Ming ______ all over the world.A. knowsB. knewC. is knownD. was known( ) 4. — Do you often clean your classroom?— Yes. Our classroom _______ every day.A. cleanB. cleansC. is cleanedD. is cleaning( ) used to go shopping together, ________？A．didn‘t they B．weren't they C．did they D．used they( ) 6. — Is Yi Jianlian ________ NBA player?— He used to t now he plays for Guangdong Southern Tigers in CBA.A. aB. anC. theD. \( ) 7. —Why don’t you buy a camera?— Do you think I need to? My phone is often used ________ a camera.A. byB. forC. asD. with( ) 8. To plantime better, you can make a ________ of the things you need to do first.A. listB. projectC. numberD. lot( ) 9. — Was table tennis invented by the Chinese?— No. It ________ in China until the start of the 20th century.A. playedB. was playedC. didn’t playD. wasn’t played( ) 10. — Can we pick some oranges to eat?—Can’t you see that they are green? They must be ________.A. sweetB. saltyC. hotD. sour二、完型填空（15分）Pets are part of people’s life. If you are like most people 11 have pets, you care for them as if they were your children. Meeting their needs is a(n) 12 part of your day, because you want them to have everything they need. One thing they need but cannot tell you about is 13 .Many pet 14 on animals’ music because this helps their pets to feel 15 when they are gone. Most people are 16 throughout the day, leaving their pets 17 at home. To make your pets feel comfortable and safe, you could try putting on music before you 18 the house.You mige to 19 music to see what type works for your pet. If you just want to keep your pet calm, you will need to play 20 music instead of rock or hip-hop music, which might 21 your pet.Also, ed to know that different pets act 22 to music. Hard rock music has also been found to work 23 to calm some pets, as well as piano music.24 piano music works well on most animals, it works best on cats.Playing musicso a great idea for people with 25 pets. They can have such a difficult time getting used to their new environment that they need all the help.( )11. A. which B. who C. whom D. whose( )12. A. small B. difficult C. important D. unimportant( )13. A. food B. money C. music D. interest( )14. A. owners B. scientists C. shops D. projects( )15. A. sadder B. angrier C. worse D. better( )16. A. at work B. at home C. at the door D. at the church( )17. A. aloud B. awake C. alone D. asleep( )18. A. buy B. leave C. build D. clean up( )19. A. change B. make C. write D. listen to( )20. A. noisy B. hard C. loud D. soft( )21. A. interest B. annoy C. worry D. entertain( )22. A. bravely B. correctly C. differently D. the same( )23. A. badly B. well C. hard D. closely( )24. A. Though B. Until C. Because D. Since( )25. A. big B. old C. little D. new三、阅读理解（40分）AThe best way of learning a language is using it .The best way of learning English is talking in English as much as possible. Sometimes you’ll get your words mixed up ( 混合)and people will not understand you .Sometimes people will say things too quickly and you can’t understand them. But if you keep your sense of humor (幽默感),you can always have a good laugh at the mistakes you make. Don’t be unhappy if people seem to be laughing at your mistakes. It is better for people to laugh at your mistakes than to be angry with you. because they don’t understand what you are saying .The most important thing for learning English is : “Don’t be afraid of making mistakes because everyone makes mistakes. ”( ) does the writer think that the best way for you to learn a language?A. WritingB. Using itC. ListeningD. Learning grammar( ) 2. What should you do in learning English?A. Be careful not to make any mistakes . B .Write as quickly as you can .C .Speak English as much as you can.D .Laugh more often .( ) 3. When people laugh at your mistakes, what should you do?A. Not mind.B. Be happy.C. Feel worried.D. Be unhappy.( ) 4. When you make a mistake, what should you do?A. Keep quiet.B. Get angry.C. Be kind.D. Keep your sense of humor.( ) does the story tell us?A. Only foolish people make mistakes.B. Few people make mistakes.C. People never make mistakes. D .There is no one who doesn’t make mistakes.BA frog (青蛙) is born in a small river. When he is young, the river is his home. He doesn’t know his parents, but he has hundreds of brothers and sisters. He swims about and plays all day with them. At that time, he doesn’t look like his parents. He has no legs, but he has a long tail. So he looks like a fish.Then his tail gets shorter and shorter. And he has four legs and a very short tail. He looks like his parents now. Then he’s going to eat a lot of insects（昆虫）– a lot of bad insects.（）6. Where is a frog born?A. In a holeB. On the landC. On a treeD. In a river（）7. What does a baby frog look like?A. L ooks like his parents, but he doesn’t know them.B. Looks like a fish and he knows his parents.C. Looks like a fish and he has hundreds of brothers and sisters.D. Has a long tail and four legs.（）8. Whom does a baby frog play with?A. Plays all day with his parents.B. Plays all day on the land.C. Swims around and plays all day by himself.D. Plays with his brothers and sisters in the river.（）9. What does a mother frog look like?A. Its legs are short but its tail is long.B. It has four legs and a very short tail.C. It has no tail .D. It has two legs and a long tail（）of the following sentences is TRUE?A. likes his parents, can’t eat a lot of insectsB. dislikes his parents, can eat a lot of insectsC. likes his parents, can eat a lot of bad insectsD. likes his parents, can eat a lot of fliesCA father isn’t happy with his only son. He doesn’t think his son is clever.One day, the father gives his son a task. He says, here is a coin. Go to buy one thing. That must be something to eat, something to drink, and something to plant.“What can I buy with one coin? It is too hard!”Then a girl finds the boy is not happy and comes up to him. “Can I help you? ”The boy tells her that hard task. “I know what you can do, ”she says. “Go and buy a watermelon with this coin. ”It will give you everything your father wants.”The boy thanks the girl and then runs to buy a watermelon.When the father sees the watermelon, he is very happy. “Good Job!”“In fact, that’s not my idea. A girl helps me”, says the boy. The father then says, “Honesty is more important than cleverness.”( ) 11. Why isn’t the father happy?A. He doesn't think his son is clever.B. His son is lazy.C. His son doesn’t study hard.D. His son can’t buy something for him.( ) 12. What does the boy think about what his father says?A. Where to buy it.B. What to buy.C. How to buy it.D. Why to buy it.( ) 13. Who helps the boy?A. A girl.B. An old man.C. A friend.D. A teacher.( )14. How does the father feel when he sees the watermelon?A. SadB. HappyC. SurprisedD. Angry( ) 15 .What is the meaning of “honesty”in Chinese?A. 失败B. 坚持C. 诚实D. 骄傲DThe size and shape of your ears show your character more than any other parts of the face. Other parts of the face change shape as we get older, but ears do not change their shape. They only change in size.Reading people’s character from their ears is an old science. In very old times people thought that a person with big ears had a good and generous character. They thought that a person with pale (nearly white), small ears was dangerous. They also thought that the shape of the ear showed whether a person was musical or not. Today, too, many people believe that the size and the shape of the ear help you know if a person is musical.Ears are all different, and each characteristic has a meaning. Next time when you look at a person, see if his ears are large or small. Look at the lobes( the lowest part of the ear). Are they attached(连着) to the face? Ears that are always red mean a person may easily get angry, or he/she just has high blood pressure(高血压). Ears that are always cold and pale mean a person has a nervous character. And a big inside hole of the ear means a person is musical.( ) 16 What might in the old times people ask for help from a person with?A. Red ears.B. Big ears.C. Small ears.D. Pale ears.( ) 17. What is the passage mainly about?A. the size of our earsB. musical earsC. ears which related to charactersD. our faces and ears( ) do we know change shape as we get older from the passage?A. earsB. hairC. eyesD. teeth( ) 19. What can we guess Beethoven may have?A. pale earsB. white earsC. small earsD. ears with a big inside hole( ) 20., What may you find the ears of your teacher if you are often late for school?A. get biggerB. get smallerC. get colderD. get redder四、补全对话（5分）Tom: What are you going to be after leaving school?Bill: I’m thinking about becoming a pilot. I like planes very______1______.Tom: So you like traveling, don’t you?Bill: Of course, I do. I like to____2____different places., make different friends and know different things.Tom: That sounds good. But I would rather live in our place.Bill: What do you want to be in the future?Tom: _____3____I’ll be a businessman. I like to go into business and make money.Bill: Business people are very ____4_____, you know.Tom: You’re right. But I’m always thinking “busy” is ____5____ than “free”.五、选词填空（10分）根据短文内容，在短文后的空格处选填一个恰当的词，使短文完整、通顺。

人教版英语九年级第四单元基础练习题

人教版英语九年级第四单元基础练习题Common Progress Please Criticize九年级第四单元基础练题一：单词拼写1.The show was so humorous that all the people laughed.2.What's wrong。

Why are you silent there。

Say something about it.3.Mary works harder this term。

and she got the highest score on the exam.4.Don't eat so much junk food。

You should change your eating habits.5.Our history teacher told us the background of the war。

and we XXX.6.XXX to look smart for his new job interview.7.He is too busy with his business and hardly has any private time on weekends.8.My car doesn't work now。

It needs repairing.9.Tony can say the names of many kinds of insects.10.Tom hates music class because he thinks it is boring。

butI don't.11.Making much noise can affect others。

and they won't be happy.12.I'm busy this term。

and I seldom go shopping with my friends.13.XXX dislikes going to school。

【初中语文】部编版九年级上册4 你是人间的四月天(练习题)

部编版九年级上册4 你是人间的四月天(832)1.根据拼音写出下列形似字。

(1)sǎ（）水jiǔ（）水shěn（）笑shài（）太阳(2)娉tíng（）tíng（）台楼阁tíng（）滞(3)房liáng（）liáng（）食(4)ní（）喃拘nì（）忸ní（）亲nì（）(5)pīng（）婷招pìn（）驰chěng（）2.根据意思填写词语。

(1) ：形容女子的姿态美。

(2) ：鲜艳美丽。

(3) ：古代帝王、官员戴的帽子。

3.填空。

《你是人间的四月天》的作者是，她是著名的、诗人、。

4.默写。

(1)我说你是人间的四月天；/。

(2)你是四月早天里的云烟，/，星子在/无意中闪，。

(3) ，是燕/在梁间呢喃，——，，/，你是人间的四月天！5.下列句子中加点的字注音有误的一项是（）A.那轻，那娉．（pīng）婷B.百花的冠．（guàn）冕．（miǎn）你戴着C.你是，鲜妍．（yán）D.是燕/在梁间呢．（ní）喃．（nán）6.下列句子中有错别字的一项是（）A.轻灵/在春的光艳中交舞着变B.星子在/无意中闪，细雨点撒在花前C.水光浮动着你梦期待中白莲D.你是一树一树的花开，是燕/在梁间呢喃7.下列句子朗读节奏划分不当的一项是（）A.笑响点亮了/四面风B.雪化后/那片鹅黄C.百花的冠冕/你戴着D.是燕/在梁间/呢喃8.下面对《你是人间的四月天》一诗的说法不正确的一项是（）A.关于这首诗有两种说法：一是为悼念徐志摩而作；一是为儿子的出生而作，以表达心中对儿子的希望和儿子的出生带来的喜悦。

B.诗中采用了比喻的修辞手法，意象美丽而丝毫无雕饰之嫌，反而愈加衬出诗中的意境。

C.诗的第五节以抽象的花、燕来比喻心中的你，与诗的开篇呼应，诗情回旋而流转，毫无滞涩之感。

D.本诗的语言特点是：讲求格律的和谐和音律的乐感。

深圳市莲花中学初中英语九年级全册Unit 4经典练习题(课后培优)

一、选择题1．I have no idea how____________ with the problem.A．deal B．dealt C．to deal D．dealing C解析：C【详解】句意：我不知道如何解决这个问题。

考查非谓语动词。

deal动词原形；dealt过去式/过去分词；to deal动词不定式；dealing动名词/现在分词。

分析句子结构可知，本题考查“疑问词+ to do”结构。

故选C。

2．—You’d better______ smoking. It’s bad for your health.A．put up B．give upC．make up D．stay up B解析：B【详解】句意：-你最好放弃吸烟，它对你的健康是有害的。

put up张贴；搭建；give up放弃；make up编造，弥补；stay up熬夜。

根据句意It’s bad for your health可知，应该“放弃吸烟”，故应选B。

3．---Mike is ___________ that everyone like listening to the jokes he tells.---Yes. He can always bring us much fun.A．a such humorous man B．so a humorous manC．such a humorous man D．a so humorous man C解析：C【详解】句意：---迈克是这么一位幽默的人，大家都喜欢听他讲的笑话。

---是啊，他总能带给我们很多欢乐。

such…that…与so…that…都可以用来引导结果状语从句，意为“如此……以致……”。

such是形容词，其结构是：such+(a/an)+（形容词）+名词+从句；so是副词，与形容词或副词连用，其结构是：so+adj.（adv.）+that从句。

man是可数名词单数。