中考天天练18

初三化学天天练——3.141．取三种植物的花瓣分别放在研钵中，加入酒精研磨，得到花汁．各取少许花汁，用稀酸和稀碱进行检验，结果如下表所示：则下列说法中正确的是（）A．研磨花瓣过程中加入酒精是为了溶解其中的色素B．25℃时，遇到pH=10的溶液，玫瑰花汁会变成粉红色C．可用雏菊花汁来区别H2SO4和K2SO4溶液D．上述三种花汁都能用作酸碱指示剂2．某同学在化学晚会上为大家现场作了一幅《镜湖灯影》的景色画：他在白纸上用干净的毛笔蘸取甲溶液“画上”一串灯影，再用另一支毛笔蘸取乙溶液在灯影周围“画上”一片湖水，将白纸挂在墙上，待晾干后，用装有丙溶液的喷雾器向白纸上喷洒．结果出现了“蓝色的湖面上倒映着红色的灯影”的画面．该同学所用的甲、乙、丙三种溶液可能是下列四项中的（）A．稀盐酸氢氧化钠溶液石蕊溶液B．氢氧化钾溶液稀盐酸石蕊溶液C．氯化钠溶液硫酸钾溶液硫酸钠溶液D．石灰水稀硫酸氯化钠溶液3．对实验现象的观察和分析，有助于获得化学知识并学会科学探究的方法．下列对实验现象的分析合理的是（）A．向某无色溶液中滴入酚酞试液，呈红色，证明该溶液是碱溶液B．某物质能与稀盐酸反应产生气体，则该物质一定是金属C．某气体通过灼热的氧化铜后，氧化铜变红色，则该气体可能是氢气D．把燃着的木条伸入某无色气体的集气瓶中，火焰熄灭，证明该气体是二氧化碳4．同学们在准备实验操作考查实验过程中，有如下猜想．你认为不正确的有（）A．在鸡蛋壳中加入稀HCl，如产生的气体通入澄清石灰水后有浑浊现象，可见蛋壳中含有CO32﹣B．不同颜色花瓣的浸出液遇碱溶液一定变蓝色C．花瓣中的有机色素分子更容易分散于酒精的微粒之中D．在同一温度下，有机色素在酒精中的溶解度大璃水中的溶解度5．当一种物质M放入滴有酚酞试液的无色液体N中，液体的颜色由无色逐渐变为红色，请联系如图判断下列表述中正确的是（）A．物质M一定是碱性氧化物B．原液体N一定是酸性溶液C．图象表示的曲线中只有曲线A符合题意D．A和C两条曲线都可能是符合题意的图象6．A，B，C三只小烧杯内依次盛有一定体积的浓氨水、酚酞溶液、酚酞溶液，按图所示进行探究活动，不能得到的结论是（）A．氨分子是不断运动的B．碱能使酚酞溶液变红C．空气不能使酚酞溶液变红D．氨分子溶于水，形成的氨水使酚酞溶液变红7．为提高染发剂染色效果，一般先用碱剂等对头发预处理．某碱剂在染发时可闻到刺激性气味，该气体能使湿润的红色石蕊试纸变蓝．则该气体为（）A．CO2 B．O2C．NH3D．H28．“果导片”是一种常用缓泻剂，主要成分是酚酞．某同学欲将其作为酚酞指示剂的替代品，他将“果导片”研成粉末放入酒精中，搅拌、静置，取上清液滴入白醋和食盐水，看到，滴入澄清石灰水发现；确定“果导片”可作酸碱指示剂使用．当他用饮料吸管向滴有“果导片”清液的澄清石灰水吹气时，可观察到现象．9．某学习小组对硫酸进行如下研究：（1）若对稀硫酸进行如下操作，溶液的pH升高的有（填字母）．A、加少量水B、加少量铁粉C、加少量氢氧化钾D、加少量浓硫酸（2）向两个烧杯中分别注入两种硫酸，甲（溶质质量分数为98%，密度为1.84g/cm3）和乙（硫酸钾与水的暗体积比1：1混合）各10ml，称量并记录不同时间（h）两种硫酸溶液吸水的质量，数据见表：①若量取硫酸甲时俯视读数，在其他操作正确的情况下，所配硫酸乙的溶质质量分数将（填“偏大”、“偏小”或“内能”）．②由表中实验数据可知：有关硫酸吸水性的说法错误的是（填字母）．A、硫酸甲和乙都有吸水性B、只有硫酸甲有吸水性C、硫酸甲的吸水性较硫酸乙强（3）小军同学利用稀释后的稀硫酸和硝酸钡、氢氧化钠、碳酸钾等物质的溶液对“复分解反应发生的条件”进行再探究．①将上述四种溶液两两混合，判断其两两之间能否发生反应，请写出其中发生中和反应的化学方程式；②利用上述四种物质的溶液完成实验后，将所得物质混合并过滤，得到一种无色溶液，经测定，该溶液显酸性，则在该溶液中一定含有的离子是，可能含有的离子是．10．某同学把自制的一种黄色花汁，分别滴加到下列不同的试剂中，并记录观察到的现象如下表所示．请分析上表，并回答下列问题：（1）该花汁（填“可以”或“不可以”）作酸碱指示剂．（2）蚊子叮咬人时射入蚁酸（具有酸的性质），使皮肤红肿、痛痒．要缓解这种症状，简易可行的办法是在叮咬处涂抹上述试剂中的．（3）胃酸的主要成分是盐酸，胃舒平（主要成分Al（OH）3）和小苏打常用于治疗胃酸过多症，写出小苏打治疗胃酸过多症时的化学反应方程式．（4）石灰水暴露于空气中易变质，写出变质反应的化学方程式：．【解析】1、【解答】解：A、花瓣中色素是有机物，易溶解在酒精中，故A正确；B、25℃时，遇到pH=10的溶液为碱性溶液，玫瑰花汁会变为绿色，故B错误．C、雏菊花汁遇中性和酸性溶液都是无色，则不能区分H2SO4和K2SO4溶液，故C 错误．D、三种花汁中万寿菊遇酸性和中性以及碱性溶液变色是一样的，不能作指示剂，故D错误．故选A．2、【解答】解：A、稀盐酸显酸性，能使石蕊试液变红色，氢氧化钠溶液显碱性，能使石蕊试液变蓝色．故选项正确；B、氢氧化钾溶液显碱性，能使石蕊试液变蓝色，稀盐酸显酸性，能使石蕊试液变红色．结果应该是红红的湖水倒映蓝蓝的灯笼．故选项错误；C、氯化钠溶液、硫酸钾溶液、硫酸钠溶液等物质相互混合时不能出现颜色方面的变化．故选项错误；D、石灰水、稀硫酸、氯化钠溶液等物质相互混合时不能出现红色和蓝色．故选项错误．故选A．3、【解答】解：A、向某无色溶液中滴入酚酞试液，呈红色，证明溶液是碱性溶液，但不一定是碱溶液，故说法错误；B、某物质能与稀盐酸反应产生气体，则该物质可能是活泼金属、石灰石等，故说法错误；C、氢气能够和氧化铜反应生成铜，所以该气体可能是氢气，也肯能是一氧化碳，故说法正确；D、燃着的木条伸入某无色气体的集气瓶中，火焰熄灭，证明气体不支持燃烧，可能是二氧化碳或氮气等，故说法错误．故选C．4、【解答】解：A、能使澄清石灰水变浑浊的气体是二氧化碳，能和盐酸反应生成二氧化碳的有碳酸盐和碳酸氢盐，蛋壳不溶于水，所以不是碳酸氢盐，一定是碳酸盐，所以A正确．B、不同颜色花瓣的浸出液遇碱溶液不一定变蓝色，故B错误；C、花瓣的有机色素和酒精都是有机物，所以有机色素更容易分散子有机溶剂中，所以正确．D、在同一温度下，有机色素在酒精中的溶解度大于在水中的溶解度，所以用酒精提取花中有机色素，故D正确．故选B．5、【解答】解：酸性和中性溶液能使酚酞试不变色，而碱性溶液能使酚酞试变红；一种物质M放入滴有酚酞试液的无色液体N中，液体的颜色由无色逐渐变为红色，说明M是碱性物质，N是酸性溶液或中性溶液．A、物质M不一定是碱性氧化物，有可能是碱或显碱性的盐，故A错误；B、N是酸性溶液或中性溶液，故B错误；C、溶液的pH值都增大，所以A和C两条曲线都可能是符合题意，故C错误；D、A和C两条曲线都可能是符合题意，故D错误．故选：D．6、【解答】解：据图可以看出，一段时间后大烧杯内的酚酞试液变红，但是A和B并没有直接接触，说明是氨分子的运动造成的，氨分子溶于水形成的氨水能使酚酞变红，而露置在空气中的酚酞试液不变色，说明空气不能使酚酞溶液变红．观察选项，只有B不能通过本实验得出，故选B．7、【解答】解：A、二氧化碳是无色无味的气体，故A错误；B、氧气是无色无味的气体，故B错误；C、氨气有刺激性气味，且其水溶液显碱性，故C正确；D、氢气是无色无味的气体，故D错误，故选C．8．【解答】解：由指示剂的知识可知酚酞遇酸不会变色，白醋属于酸，其溶液显酸性，遇酚酞不会变色，加入氢氧化钙后不断中和掉白醋，直至反应恰好反应后氢氧化钙过量，溶液会慢慢呈现碱性，酚酞会变红，向澄清石灰中吹气时石灰水与二氧化碳反应会生成碳酸钙的沉淀，直至氢氧化钙消失．故答案为：无明显变化；变红色；溶液浑浊颜色变浅（或消失）．9．【解答】解：（1）因为相同温度下，硫酸的质量分数越大溶液的酸性越强，溶液的pH越小．向稀硫酸中加入加少量水时，硫酸的质量分数变小，溶液的pH 变大，但没有发生化学变化；向稀硫酸中加入铁粉时，铁和硫酸反应，酸性转减弱，溶液的pH要增大；向稀硫酸中加入氢氧化钾时，氢氧化钾和硫酸反应，溶液的pH要增大，所以溶液的pH因化学变化而升高的有ABC；（2）①在量取时浓硫酸时是俯视读数，实际量取的浓硫酸少了，所配置的稀硫酸的质量分数偏小；②由表中实验数据可知：硫酸甲和乙都有吸水性，硫酸甲的吸水性较硫酸乙强，故B错误；（3）①由四种物质的性质可知：硫酸与氢氧化钠发生中和反应，化学方程式是：H2SO4+2NaOH═Na2SO4+2H2O；②由于溶液混合后显酸性，所以溶液中应含有H+，不含有CO32﹣；硫酸根离子与钡离子结合形成沉淀，一定不存在钡离子和硫酸根离子．所以溶液中一定含有的离子有：H+、Na+、K+和NO3﹣；溶液中可能含有Ba2+或SO42﹣．故答案为：（1）ABC；（2）①偏小；②B；（3）①H2SO4+2NaOH═Na2SO4+2H2O；②H+、Na+、K+和NO3﹣，Ba2+或SO42﹣．10、【解答】解：（1）由于稀盐酸、食醋显酸性；蔗糖水、蒸馏水呈中性；肥皂水、烧碱溶液以及石灰水呈碱性，而从表中的颜色变化可知：该花汁遇到酸、碱以及中性溶液均会呈现不同的颜色，故可以作指示剂使用；（2）由于蚁酸呈酸性能导致皮肤红肿、痛痒，故要消除症状应该涂抹碱性物质，所以应在肥皂水、烧碱溶液和石灰水中选择，而烧碱溶液和石灰水均对皮肤具有腐蚀性所以不可选，因此应该涂抹肥皂水；（3）小苏打是碳酸氢钠的俗称，胃酸主要是盐酸，二者反应生成氯化钠、水和二氧化碳，化学方程式为：NaHCO3+HCl═NaCl+H2O+CO2↑．（4）石灰水中的氢氧化钙能与空气中的二氧化碳反应生成碳酸钙和水，从而导致溶液变质，方程式为：CO2+Ca（OH）2═CaCO3↓+H2O．故答案为：（1）可以；（2）肥皂水；（3）NaHCO3+HCl═NaCl+H2O+CO2↑；（4）CO2+Ca （OH）2═CaCO3↓+H2O．。

天天练18第一篇：天天练18天天练181．下列各句中，加点的词语使用恰当的一项是(2分)A．体坛风云人物颁奖典礼上，中国男子游泳奥运冠军第一人孙杨获最佳男运动员奖，无独有偶，游．．．．泳队叶诗文获最佳女运动员奖。

B．公平分享发展成果，改革的动力就能充分释放，改革的活力就能极大迸发，共同富裕就能计日程功。

．．．．C．“8．16”特大洪水灾害发生后，全市各机关和广大人民群众，积极捐款捐物，奉献爱心，我们也要响应号召，鼎力相助。

．．．．D．由于购房者对楼市政策有多种揣测，观望心态较重，今年年初，新房、二手房交易量大幅下跌，全国楼市哀鸿遍野。

．．．．2．下列各句中，没有语病的一句是（2分）A．2014年2月14日，西方情人节与中国元宵节同期相遇，记者走访发现，当公众还在讨论是该回家吃汤圆还是捧着玫瑰陪恋人，消费市场已“甜蜜一片”。

B．网民说，春晚小品《扶不扶》的故事还在耳边回响，现实中又发生这样的事情，的确挺让人唏嘘，呼吁大家都从自己做起，传递更多正能量。

C．国防科工局昨天正式宣布，12日下午，“玉兔”号月球车受光照成功自主唤醒；此前，嫦娥三号着陆器于11日实现自主唤醒，进入第三个月昼工作期。

D．出版业当然要讲究装帧艺术，讲究宣传造势和市场营销，但要想真正赢得读者、赢得市场，最终还取决于刊物内容是否具有吸引力和感染力。

3．下列各句中，加点的成语使用恰当的一句是（2分）A．《舌尖上的中国》以富有草根气息的语调，把中国饮食文化讲述得栩栩如生，这既让国人兴奋不已，．．．．也向世界发出了一张“中国名片”。

B．记者在交谈中发现，绝大多数人对如何确保“秒杀”的高成功率三缄其口，有的甚至以为遇到了来．．．．探底的同行而将记者的淘宝账号拉入“黑名单”。

C．今天的班会上，班主任让张一斌同学介绍自己助人为乐的事迹，他脸憋得通红，出言无状，只结结．．．．巴巴的说了一句：“这是我应该做的。

”D．对于高三学子来说，这个学期是他们高中阶段关键的一个学期，大家都全力以赴，不怕苦累，只为了将来能在社会上有立锥之地。

2018中考英语阅读天天练系列——3月篇D( ) 1. How long is it since basketball was invented?A. 1000 yearsB. More than 100 yearsC. 1100 yearsD. Less than 100 years( ) 2. The students felt unhappy because _______.A. they had much homework to doB. they often got into fightsC. they couldn't play outdoorsD. they had little time to study( ) 3. Who as ked Dr. Naismith to invent a game?A. Some studentsB. Some teachersC. Some students' parentsD. Some of his friends( ) 4. When a student ______ , he makes a score.A. receives the ball.B. throws the ball to another studentC. runs quickly with the ball in his handD. throws the ball into the basket( ) 5. Which sentence is right?A. Dr. Naismith had to use fruit to throw the ball.B. It was easy to invent the game.C. The students could go outdoors when the weather was bad.D. The ball had to be thrown into the basket five feet above the floor.4、阅读理解Sure，it's good to get along with your teacher because it makes the time you spend in the classroom more pleasant．And yes，it's good to get along with your teacher because，in general，it's smart to learn how to understand the different types of people you'll meet throughout your life．"But really，there's one super﹣important reason why you should get along with your teacher．When you do，learning bursts right open，"says Evelyn Vko，a longtime teacher who writes an education column called"Teacher Says"for the Washington Post new spaper．In fact，kids who get along with their teachers not only learn more，but they're more comfortable asking questions and getting extra help．This makes it easier to understand new material and do your best on tests．When you have this kind of relationship with a teacher，he or she can be someone to turn to with p roblems，such as problems with learning or school life，such as bullying．As a kid in a primary or middle school，you're at a wonderful stage in your life．You're like a sponge （海绵），able to absorb lots of new and exciting information．On top of that，you're able to think about all this information in new ways．Your teacher knows that，in most cases，is very excited to be the person who's giving you all that material and helping you make it．Remember，teachers are people，too，and they feel great if you're open to what they're teaching yu．That's why they wanted to be teachers in the first place﹣to teach!Some kids may be able to learn in any situation，whether they like the teacher or not．But most kids are sensitive to the way they get along with the teacher，and if things aren't going well，they won't learn as well and won't enjoy being in class．1．In the passage，the author mainly talks about ．A．how to get along well with othersB．how much the students are expected of to get along with teachersC．the importance of a good relation with teachersD．how to make the time in the classroom more pleasant2．"Learning bursts right open"in the third paragraph really means ．A．there will be more problems with learningB．you find an opening to learningC．learning becomes easier for you at o nceD．there will be no problems at all with learning3．Which of the comments is FALSE on teachers and their work according to the passage？A．Teachers sometimes have the same feelings as students do．B．Teachers are excited even if you wouldn't like to accept their teaching．C．Though few，there are still some students who can learn even if they don't like the teacher．D．Having a bad relationship with your teachers does more or less harm to your studies．5、World Tai Chi and Qigong Day is an event held on the last Saturday of April each year，which promotes(倡导) practices of Tai Chi and Qigong.Followers of Tai Chi and Qigong especially hope to educate the world about the health benefits(益处) of the two exercises.The World Tai Chi Day website says it is also a day to help put people in touch with teachers and healing(治疗) centres.This event，which started in 1999，joins people in over 65 countries.That number grows every year as Tai Chi becomes better known.Celebrations include Tai Chi exhibitions(表演) in many cities around the world.The day is recognized by the World Health Organization.Tai Chi is actually a Chinese martial art，also called Wushu.I t is not used for selfdefence，but is instead practised for health reasons.Doctors say it has benefits for those who have heart and blood pressure problems.Many people who practise it say it makes you live longer.Tai Chi is famous around the world for its followers practise it in parks.A type of Tai Chi with just 42 movements was a sport in the 11th Asian Games in 1990.There are attempts(尝试) to make it an Olympic event.1．When is World Tai Chi and Qigong Day?A．In the last month of each year.B．On the last day of April each year.C．On each Saturday of the fourth month.D．On the last Saturday of every April.2．The event is held to ________ Tai Chi and Qigong.A．encourage the development ofB．cure people of their illnesses byC．get the world together to practiseD．educate the world to make money from3．How is World Tai Chi and Qigong Day celebrated?A．The followers travel to over 65 countries.B．Tai Chi members are recruited on the website.C．There are Tai Chi performances in many cities.D．The World Health Organization holds different activities.4．What does“selfdefence” in the second paragraph mean?A．自我牺牲 B．自我防卫C．自我欣赏 D．自我表现5．Which of the following is TRUE about Tai Chi?A．It is becoming better and better known in the world.B．It is only good for those people who have heart problems.C．It has been a sport in Asian Games since 1990.D．It is now one of the events in the Olympics.6、阅读理解Mother's Day is coming. It is time to let Mom know she's special to you. Finding the right gift for Mom on that day is not always easy. We often want something personal and thoughtful. But how can we make it? These following ideas may help you.Gift of TimeMoms just want to spend time with their children，so make it a MotherDaughter/Son day.Spend the whole day with her. Do the things she likes doing with her.Home VideoTake your family videos and make them a short home video. She can enjoy it whenever she misses you. Although it may take a lot of time，the process(过程) can be great fun and the result is often priceless(无价的)．Mom MixMake a CD for her. It's a collection of all the songs that remind her of you and your growing up.Write a LetterWrite a letter instead of a simple card. Write about all the good memories you have with her and all the things she has done for you.FlowersPeople send carnations on Mother's Day. You can easily spend a lot of money on them. If you have flowers in your garden，you can pick them.They can be a great gift.DinnerMake a dinner and invite her over. You can also take it to her house and surprise her. Just don't forget to wash the dishes after the dinner.1．Why is it not easy to find a right gift on Mother's Day?A．Because we want to save money.B．Because mothers don't like gifts.C．Because we always want to get something special.2．Making a home video may be ________.A．fun B．boring C．easy3．What does the underlined word “remind” mean in Chinese?A．使……防范B．使……想起C．使……经过4．How many kinds of ideas have been mentioned here for Mother's Day?A．4. B．5. C．6.5．From the passage we know________.A．you can buy a big cake for your mom on Mother's DayB．writing a letter is better than sending a simple card to your mom on Mother's DayC．inviting your mom to eat in a restaurant is a good gift for her7、People connect colours with different things and feelings. Red, for example, is tile colour of fire, heat, blood and life. People say red is an exciting and active colour. They connect red with a strong feeling like anger. Red is also used for signs of danger, such as STOP signs and fire engines. Orange is the bright, warm colour of leaves in autumn. People say orange is a lively colour. They associate (使联系)orange with happiness. Yellow is the colour of sunlight. People say it is a cheerful colour. They associate yellow, too, with happiness. Green is the cool colour of grass in spring. People say it is a refreshing colour.In general, people talk about two groups of colours: warm and cool colours. The warm colours are red, orange and yellow. Where there are warm colours and a lot of light, people usually want to be active. Those who like to be with others like red. The cool cotours are green and blue. Where there are these colours, people are usually quiet.Some scientists say that time seems to go by more slowly in a room with warm colours. They think that a warm colour is a good one for a living room or a restaurant. People who are having a rest or eating do not want time to pass quickly. Cool colours are better for some offices where the people working want time to pass quickly.1. People associate __________ with happiness.A. yellowB. orangeC. greenD. Both A and B2. People use the colour of __ for STOP signs.A. redB. greenC. yellowD. pink3. ________ can make people more active.A. Cool coloursB. Warm coloursC. Green and blueD. Both warm colours and cool colours4. The scientists suggest warm colours for a living room or a restaurant because ________A. the scientists don't like cool coloursB. people want the time to pass quicklyC. time seems to go by more slowly in a room with warm coloursD. people don't like to be with their family or friends5. Which of the following is True according to the passage?A. Both warm colours and cool colours bring happiness to people.B. Blue is thought to be a refreshing colour.C. Warm colours represent fire, heat, blood and life.D. Workers in the offices with cool colours feel time pass quickly8、 When we talk of plants，most of us will think of things that grow from the ground and have green leaves，but there are plants that do not look or act like other plants．Some of these belong to a special class of plants called fungi．Fungi may appear almost everywhere．They commonly grow in wet places where they can get food and water easily．Because fungi do not have green leaves to make their own food，but fungi must take their food from animals，other plants or water．Some fungi live on dead or rotting wood，while others grow on living trees or in dirt or moss(苔藓)．Mushrooms are the best—known fungi．There are many kinds of mushrooms appearing in all shapes and sizes．For example，cauliflower mushrooms(蘑菜花)are found in forests from July to October．They can grow to be as heavy as fifty pounds! They grow at the foot of trees．Squirrel’s bread(松茸)is another kind of wild mushroom．Its appearance and use can explain its name．These fungi look like small golden cakes．Squirrels can easily eat them or carry them off to their hole to eat later．The mushrooms found in food stores are carefully grown by people who know they are safe to eat．People are warned never to touch of tasting wild mushrooms because some of them are deadly．Even less dangerous ones can still snake a person very sick．( )1．Where doesn’t fungi grow?A．On dry wood． B．In places full of water．C．On living trees． D．Behind houses．( )2．Where can fungi take food?A．From their green leaves． B．From stones．C．From rotting wood． D．From people．( )3．Squirrel’s bread is a kind of___________．A．tree B．animal C．food D．medicine( )7．People are advised not to eat wild fungi because___________．A．it is unfit for main food B．it may be dangerous to peopleC．it doesn’t taste so good D．its strange smell may do harm to people9、 No Car Day was first started by 34 cities in France on September 22，1998．It was started to protect the environment．By now，more than 1，000 cities around the world have had a No Car Day．The first No Car Day in China was in Chengdu in 2001．Other cities，including Taipei，Shanghai and Wuhan，also support the day．In Beijing，more and more people are joining the campaign．It asks drivers to leave their cars at home for one day each month and walk or ride a bike to work．It also calls on Beijingers not to use cars on June 5(World Environment Day)．The slogan(口号)for the day is，“If we drive for one less day，we can have one more nice day．”So far．more than 200，000 drivers have shown their support．“We can’t control(控制)the weather，but we can choose not to drive，”said Wu Zonghua，a car club chairman．Beijing is trying to have 238 blue sky days this year．In the first quarter of 2007，Beij ing only had 52 blue sky days．This was 11 days less than the number for the same period last year．Much of the dust comes from the desert，but cars cause most of the air pollution．We must do more for No Car Day．( )1．No Car Day was started ___________．A．to save money B．to control the weatherC．to make the air cleaner D．to keep out dust from the desert( )2．The No Car Day campaign asks Beijing drivers___________．A．to work hard to get fewer blue sky daysB．not to work on World Environment DayC．to ride a bike or walk instead of driving to workD．to leave their cars at home for a week each month( )3．When is World Environment Day?A．On July 5th． B．On June 5th． C．On September 22nd． D．On February 2nd．( )4．Which of the following about No Car Day is WRONG?A．It was first started in France in September，1998．B．It was first stared in China in 2001．C．It is supported by over 1，000 cities around the world．D．It was first started by a car club chairman in Beijing．10、阅读理解Sing the Language You're LearningHow can you remember a song from your childhood to this day? Why do your teachers use songs to teach you English? It seems there is a scientific reason for this.Researchers are now studying the relationship between music and remembering a foreign language. They find that remembering words in a song is the best way to remember even the most difficult language.“Sing ing could be a new way of learning a foreign language. The brain likes to remember things when they are used in a catchy and meaningful way，” said Dr. Karen Ludke. The findings may help those who have difficulty learning foreign languages. On his blog, Dr. Ludke writes, “A listenandrepeat singing method can support foreign language learning, and open the door for future research in this area.”Many language teachers know the value of using music and singing. Hua Zhuying, a teacher at a Chinese language school in Washington D．C.depends heavily on songs in teaching Chinese. She says, “I use music all the time to teach children Chinese. For little kids usually we use English songs but teach them the Chinese lyrics. So it's easy for them to start because they know the music. Not only does it work, but it is fun for the kids.”“Sometimes, I think if I were taught English that way, maybe I would speak much better English than now，” Hua Zhuying adds.Our brain likes music, especially for remembering. So, if you're still struggling in learning a language, why not try singing it out？1. According to the passage, the best way to remember a foreign language is to______.A. read and write moreB.listen to the teacher carefullyC.copy the words many timesD.remember words in a song2. The underlined word “catchy” probably means “______”.A.晦涩难懂的 B．悦耳易记的C.枯燥乏味的 D．震耳欲聋的3. Dr. Ludke believes that foreign language learning can be supported by______.A. using the listenandrepeat singing methodB.listening to all kinds of famous musicC.writing songs with the languageD.reading t he lyrics again and again4. From the passage, we know that Hua Zhuying ______.A. is interested in writing English songsB.teaches children English by using musicC.teaches Chinese in an American schoolD.is a researcher in a language school5. The passage mainly tells us that______.A. many researchers realize the importance of language studyingB.your brain remembers a language better if you sing itC.many language teachers know the value of famous musicD.you will never learn a language well unless you can sing11、 Fire can help people in many ways. But it can also be very harmful. Fire can make water hot and house warm, give light and cook food. But fire can burn (燃烧) things, too. It can make trees, houses, animals and other things catch fire (起火). If some people can't run away from fire, it can kill them. This happens in every country every year.Sometimes big fire can burn forests. A month ago, a large forest fire broke out in Yunnan Province. It lasted nearly half a month. The forest in Heilongjiang Province and the grassland in Inner Mongolia caught fire in May, 2006. After more than ten days' fight, over 30,000 people and soldiers put out (扑灭) the fire at last.Nobody knows clearly when people began to make fire, but there are many interesting stories about the first time a man or a woman started a fire. One story from Australia tells about a man who went to the sun and brought fire down a long time ago. Today people know how to make a fire with matches (火柴). Children sometimes like to play with them. But matches can be very dangerous. The match can burn a piece of paper and then it can burn a house. A small fire can become a big fire, and destroy many things. Fire kills many people every year. So you must be careful with fire.根据短文内容，选择最佳答案。

中中中中中中中中中 Day 18一、完形填空阅读下面短文, 从短文后所给各题的A. B. C. D四个选项中, 选出可以填入空白处的最佳选项。

One night many years ago, an angry voice woke me up from sleep. It was my drunken (喝醉的) father. Those days, he would always ___11___ home very late. Sometimes, he would also go on to fight with my mom.My earliest memory of these events began when I was around four years old. I was filled with ___12___ at that time. There were lots of ___13___ — crying, shouting, and doors slamming (砰地关上).Then, there was a ___14___ knock at the door. My father opened the door. There were two tall men in blue. They wanted to come inside to ___15___ everyone was okay. In a moment, my father was taken away. Everything became peaceful.My father came back the next day. He became very friendly and ___16___ brought my mom flowers. I knew that these men in blue had taken away my fear. From that day on, ___17___ I wanted to be was a policeman. And my dream has come true.I realized that police officers not only ___18___ the little boy in me, but made me a helpful person. Once, my colleague (同事) and I jumped into a river and got a driver ___19___ a sinking (下沉的) car. Another day, we kicked open the door into a house ____20____ the fire spread through the whole building.Police officers will always be my heroes, and I will always love my job.11. A. forget B. leave C. return D. miss12. A. surprise B. pleasure C. interest D. fear13. A. noises B. records C. choices D. results14. A. lively B. wrong C. weak D. sudden15. A. worry about B. cheer up C. make sure D. depend on16. A. still B. just C. even D. almost17. A. all B. none C. both D. neither18. A. believed B. saved C. followed D. remembered19. A. as for B. out of C. on to D. from among20. A. until B. after C. since D. before【答案】11. C 12. D 13. A 14. D 15. C 16. C 17. A 18. B 19. B 20. D【解析】【导语】本文主要讲述了作者通过小时候的经历而长大成为一名警察的故事。

万唯中考语文天天练答案江西20221、根据《红楼梦》的内容，完成下面的题目。

《红楼梦》中有许多重要章节，对于表现人物性格、推动情节发展有着重要的作用。

请选择人物序号填写在空格处。

《红楼梦》中，醉卧芍药裀的是（）[单选题] *A.贾宝玉B.林黛玉C.王熙凤D.史湘云(正确答案)2、下列选项中加着重号字注音正确的一项是（）[单选题] *A、樯橹qiáng酹lèi 吟啸xiào羽扇纶巾guān(正确答案)B、笺注qiān 赤鼻矶jī蓑衣suō料峭qiāoC、针砭biǎn 粗糙cāo 差别chā创伤chuāngD、战栗zhàn炽烈chì对称chèng 万箭攒心cuán3、1《红楼梦》中“腹内原来草莽潦倒不通世务，愚顽怕读文章”指的是贾宝玉。

[判断题] *对(正确答案)错4、下列选项中加着重号字读音与其它三项不相同的一项是（）[单选题] *A、嗜好(正确答案)B、麻痹C、刚愎自用D、包庇5、1白居易，字乐天，号香山居士，是唐代伟大的浪漫主义诗人。

[判断题] *对(正确答案)错6、下列选项中加着重号字的读音完全相同的一项是（）[单选题] *A、翩然偏执扁舟翩跹(正确答案)B、阡陌陷阱纤维纤夫C、缥缈剽窃漂白饿殍D、点缀辍学拾掇赘述7、层层的叶子中间，零星地点缀着些白花，有袅娜地开着的，有羞涩的打着朵儿的......修辞格是（）[单选题] *比喻拟人(正确答案)夸张对比8、1“都门帐饮无绪，留恋处，兰舟催发”的下一句是“执手相看泪眼，竟无语凝噎。

”[判断题] *对(正确答案)错9、下面对《红楼梦》主题理解最恰当的一项是( ) [单选题] *A.小说以贾、史、王、薛四大家族的兴衰为背景，以封建叛逆者贾宝玉、林黛玉的爱情悲剧为线索，反映了封建社会末期腐败、罪恶的社会现象和各种尖锐的社会矛盾。

揭示了我国封建社会走向衰亡的历史趋势。

(正确答案)B.小说通过贾府由极盛到衰败的过程，表现富贵如过眼云烟、万事转头空的哲理。

1．下列字形和加点的字注音全部正确的一项是（2分）A. 静谧（mì）蜷伏（quán）鳞次栉比（zhì）浑身解数（xiè）B. 剽悍（piāo）追溯（shuò）物竟天择（jìnɡ）相形见绌（chù）C. 旁鹜（wù）拮据（jū）即物起兴（xìn）恪尽职守（kè）D. 酷肖（xiào）慰藉（jiè）吹毛求痴（cī）忍俊不禁（jìn）2．(原创题)下列句子中没有错别字的一句是()A．看看明星们的素颜照和化装后的对比照片，化装后的造型是不是更加赏心悦目一点点呢？其实明星跟普通女孩子一样，没啥区别。

B．如果认为，教育就是教育，游戏就是游戏，两者不沾边，水火不相融，扯不到一起。

这种认识显然存在误区。

其实教育和游戏并不是对立的，教育可以通过游戏的方式来表现。

C．翻开书卷，构想那美丽的画面，放纵自己的心随主人公起起伏伏，想像主人公的音容笑貌，或远隔时空与作者对话，咀嚼文字中的言外之意，弦外之音，这是一种何等的享受！D．他劝告那些不愿为公平竞争开绿灯的医药批发企业，如果还抱残守缺，只会“为渊驱鱼，为丛驱鹊”，最终将失去市场，无法生存。

3．下列各句中，没有语病的一句是()A．铃声响起，他急忙拿起听筒，电话那端传来一个操普通话的中年男子的声音说：“你被录取了。

”B．这位江西姑娘在51届“世界小姐”大赛中脱颖而出，获得第四名，成为本次大赛惟一进入“十佳”殊荣的亚洲选手。

C．南堡人民经过一个冬天的苦战，使一道十米高、七十米长的拦河大坝巍然屹立在天目山旁边。

D．“耶路撒冷”是和平之城的意思，却又是遭受劫难最多的城市，可是长期的冲突并没有使其失去迷人的魅力，从而使旅游者望而却步。

4.下列有关名著的表述不正确．．．的一项是( )(2分)A.《孙悟空一调芭蕉扇》中，孙悟空向铁扇公主借扇时被公主扇得悠悠荡荡，后来他施计智取了芭蕉扇，可他得到的这一把芭蕉扇是假的。

初三化学天天练-3.211．下列各组物质的溶液，不另加试剂无法一一鉴别的是（）A．NaOH HCl CuSO 4MgSO 4B．KNO 3HCl CaCl 2NaOH C．Na 2CO 3K 2SO 4BaCl 2HClD．Na 2CO 3Ca（OH）2NaOHHCl2．只经过一次实验就能将H 2SO 4、NaCl、NaOH 三种无色溶液区别开来的是（）A．纯碱溶液B．稀盐酸C．硝酸银溶液D．石蕊试液3．有关酸碱盐的说法错误的是（）A．工业上常用稀硫酸除铁锈B．水壶中的水垢常用食盐水来清洗C．炉具清洁剂中的氢氧化钠具有强烈的腐蚀性D．碳酸钠俗称纯碱，常用于玻璃、造纸、洗涤剂的生产4．有甲、乙、丙、丁四种无色溶液，它们分别是HCl、H 2SO 4、BaCl 2、Na 2CO 3溶液中的一种．为区别这四种溶液，现将它们两两混合并得到下面现象：溶液甲+乙乙+丙丙+丁甲+丁现象无明显现象白色沉淀白色沉淀无色气体根据对上述现象的分析，可推知甲、乙、丙、丁四种溶液的顺序依次是（）A．HCl、BaCl 2、H 2SO 4、Na 2CO 3B．H 2SO 4、HCl、BaCl 2、Na 2CO 3C．HCl、H 2SO 4、BaCl 2、Na 2CO 3D．H 2SO 4、Na 2CO 3、HCl、BaCl 25．下列有关物质鉴别方案中，正确的是（）A．Na 2CO 3、NaCl、KOH 三种溶液，只用酸碱指示剂即可鉴别B．MgCl 2、NaOH、HCl、Na 2SO 4四种溶液，不加任何试剂即可鉴别C．（NH 4）2CO 3、Ca（OH）2、BaCl 2、HCl 四种溶液，不加任何试剂即可鉴别D．Fe 2O 3、CuO、C、Fe 只用一种试剂无法鉴别6．下列关于物质用途的描述的不正确的是（）A．盐酸可用于金属除锈B．食盐可用作调味品C．熟石灰可用于改良酸性土壤D．硝酸铵化肥可与草木灰混合施用7．某无土栽培营养液的配方中可能含有氯化钾、硫酸铵、碳酸氢氨中的一种或几种物质，为确定配方的成分，化学兴趣小组的同学开展了以下探究活动：（1）【实验探究一】取少量固体样品在研体中与熟石灰混合研磨，有刺激性气味的气体产生，该气体能使湿润的红色石蕊试纸变色，写出可能发生该反应的一个化学方程式．（2）【实验探究二】另取少量固体样品溶于水得到溶液A，按下图所示进行实验，现象如图所述（设发生的反应都恰好完全进行）．请你回答下列问题：①白色沉淀E是．②小明认为由实验探究二可以确定该化肥中一定含有氯化钾和硫酸铵，一定没有碳酸氢铵．小强认为这个结论不正确，他的理由．为了使小明的结论正确，小强对上述实验进行了改动，他的做法是．答案1．下列各组物质的溶液，不另加试剂无法一一鉴别的是（）A．NaOH HCl CuSO 4MgSO 4B．KNO 3HCl CaCl 2NaOH C．Na 2CO 3K 2SO 4BaCl 2HClD．Na 2CO 3Ca（OH）2NaOHHCl【解答】解：A、硫酸铜溶液为蓝色，通过看颜色将硫酸铜鉴别出来，将硫酸铜溶液分别滴加到其余三种溶液中，产生蓝色沉淀的是氢氧化钠溶液，取剩余两种溶液中的一种向沉淀中滴加，蓝色沉淀消失，说明滴加的是盐酸，另一种为硫酸镁，故A 可以鉴别B、将四种溶液两两混合，都无现象，故不另加试剂无法鉴别C、将四种溶液两两混合，产生一次沉淀，一次气体的是碳酸钠，产生一次沉淀的是硫酸钾，产生两次沉淀的是氯化钡，产生一次气体的是盐酸，不另加试剂可以鉴别．D、将四种溶液两两混合，产生一次沉淀，一次气体的是碳酸钠，产生一次沉淀的是氢氧化钙，产生一次气体的是盐酸，无现象的是氢氧化钠，故不另加试剂可以鉴别．故选B2．只经过一次实验就能将H 2SO 4、NaCl、NaOH 三种无色溶液区别开来的是（）A．纯碱溶液B．稀盐酸C．硝酸银溶液D．石蕊试液【解答】解：A、纯碱溶液能与稀硫酸反应生成二氧化碳气体，与氢氧化钠溶液不反应，与氯化钠溶液不反应，不能鉴别，故选项错误．B、稀盐酸与H 2SO 4、NaCl 均不反应，与氢氧化钠溶液反应生成氯化钠和水，但无明显变化；不能出现三种明显不同的现象，不能鉴别，故选项错误．C、硝酸银溶液与H 2SO 4、NaCl 反应分别生成硫酸银白色沉淀、氯化银白色沉淀，不能出现三种明显不同的现象，不能鉴别，故选项错误．D、紫色石蕊溶液遇酸性溶液变红，遇碱性溶液变蓝，H 2SO 4、NaCl、NaOH 三种无色溶液分别显酸性、中性、碱性，使石蕊溶液分别显示红色、紫色、蓝色，能出现三种明显不同的现象，可以鉴别，故选项正确．故选：D．3．有关酸碱盐的说法错误的是（）A．工业上常用稀硫酸除铁锈B．水壶中的水垢常用食盐水来清洗C．炉具清洁剂中的氢氧化钠具有强烈的腐蚀性D．碳酸钠俗称纯碱，常用于玻璃、造纸、洗涤剂的生产【解答】解：A、硫酸能和氧化铁反应生成硫酸铁和水，所以工业上常用稀硫酸除铁锈，故A 正确；B、水垢的主要成分是碳酸钙，碳酸钙不能和食盐水反应，所以不能用食盐水来清洗水垢，可以用食醋清洗，故B 错误；C、氢氧化钠具有强烈的腐蚀性，故C 正确；D、碳酸钠俗称纯碱，常用于玻璃、造纸、洗涤剂的生产，故D 正确．故选：B．4．有甲、乙、丙、丁四种无色溶液，它们分别是HCl、H 2SO 4、BaCl 2、Na 2CO 3溶液中的一种．为区别这四种溶液，现将它们两两混合并得到下面现象：溶液甲+乙乙+丙丙+丁甲+丁现象无明显现象白色沉淀白色沉淀无色气体根据对上述现象的分析，可推知甲、乙、丙、丁四种溶液的顺序依次是（）A．HCl、BaCl 2、H 2SO 4、Na 2CO 3B．H 2SO 4、HCl、BaCl 2、Na 2CO 3C．HCl、H 2SO 4、BaCl 2、Na 2CO 3D．H 2SO 4、Na 2CO 3、HCl、BaCl 2【解答】解：四物质中BaCl 2和稀H 2SO 4和Na 2CO 3均会生成白色沉淀，Na 2CO 3和HCl、稀H 2SO 4反应均会生成二氧化碳气体，结合表格可知丙能够产生两次沉淀，因此丙是氯化钡，则乙和丁分别是硫酸、碳酸钠真的一种，那么剩下的甲就是盐酸，由于甲和丁混合能够产生气体，因此和盐酸反应产生气体的就是碳酸钠，那么乙就是硫酸，带入表格验证，符合要求，即：甲是盐酸，乙是硫酸，丙是氯化钡，丁是碳酸钠．故选项为：C．5．下列有关物质鉴别方案中，正确的是（）A．Na 2CO 3、NaCl、KOH 三种溶液，只用酸碱指示剂即可鉴别B．MgCl 2、NaOH、HCl、Na 2SO 4四种溶液，不加任何试剂即可鉴别C．（NH 4）2CO 3、Ca（OH）2、BaCl 2、HCl 四种溶液，不加任何试剂即可鉴别D．Fe 2O 3、CuO、C、Fe 只用一种试剂无法鉴别【解答】解：A、碳酸钠和氢氧化钾在溶液中都显碱性，都能使酚酞变红色，不能鉴别，故选项错误；B、四种溶液两两混合，氯化镁和氢氧化钠反应产生白色沉淀，其它物质都无现象，因此不能鉴别，故选项错误；C、四种溶液两两混合，碳酸铵和氢氧化钙会产生沉淀和气体，和氯化钡反应产生沉淀，和盐酸反应产生气体，出现不同的现象，可以鉴别，故选项正确；D、氧化铁、氧化铜、炭粉、铁粉中分别加入稀盐酸，氧化铁能与盐酸反应产生黄色的溶液，氧化铜能与盐酸反应生成蓝色的溶液，与铁粉反应能够生成气体（氢气）和浅绿色溶液（氯化亚铁），与炭粉不反应，故四者中加入一种试剂可以鉴别，故选项错误；故选：C．6．下列关于物质用途的描述的不正确的是（）A．盐酸可用于金属除锈B．食盐可用作调味品C．熟石灰可用于改良酸性土壤D．硝酸铵化肥可与草木灰混合施用【解答】解：A、盐酸可以与金属表面的氧化物反应，所以可以用来除锈，故A 正确；B、食盐主要成分为氯化钠，可以作为调味品，故B 正确；C、熟石灰主要成分为氢氧化钙，氢氧化钙显碱性，可以用来改良酸性土壤，故C 正确；D、草木灰显碱性，铵盐不能与碱性物质混用，会产生氨气，减低肥效，故D 错误．故选D．7．某无土栽培营养液的配方中可能含有氯化钾、硫酸铵、碳酸氢氨中的一种或几种物质，为确定配方的成分，化学兴趣小组的同学开展了以下探究活动：（1）【实验探究一】取少量固体样品在研体中与熟石灰混合研磨，有刺激性气味的气体产生，该气体能使湿润的红色石蕊试纸变蓝色，写出可能发生该反应的一个化学方程式NH 4HCO 3+Ca（OH）2=CaCO 3↓+NH 3↑+2H 2O 或（NH 4）2SO 4+Ca（OH）2=CaSO 4+2NH 3↑+2H 2O．（2）【实验探究二】另取少量固体样品溶于水得到溶液A，按下图所示进行实验，现象如图所述（设发生的反应都恰好完全进行）．请你回答下列问题：①白色沉淀E 是硫酸钡．②小明认为由实验探究二可以确定该化肥中一定含有氯化钾和硫酸铵，一定没有碳酸氢铵．小强认为这个结论不正确，他的理由步骤Ⅰ中加入的稀盐酸引入了氯离子，影响了氯化钾的检验．为了使小明的结论正确，小强对上述实验进行了改动，他的做法是将步骤Ⅰ中的稀盐酸换为稀硝酸．【解答】解：（1）氨气溶于水显碱性能使湿润的红色石蕊试纸变蓝色，铵态氮肥遇碱放出氨气，可能发生该反应的化学方程式是NH 4HCO 3+Ca （OH）2=CaCO 3↓+NH 3↑+2H 2O 或（NH 4）2SO 4+Ca （OH）2=CaSO 4+2NH 3↑+2H 2O；故填：蓝；NH 4HCO 3+Ca （OH）2=CaCO 3↓+NH 3↑+2H 2O 或（NH 4）2SO 4+Ca （OH）2=CaSO 4+2NH 3↑+2H 2O；（2）①硝酸钡和硫酸铵反应生成硫酸钡沉淀和硝酸铵，白色沉淀E 是硫酸钡；故填：硫酸钡；②步骤Ⅰ中加入的稀盐酸引入了氯离子，影响了氯化钾的检验，为了使小明的结论正确，小强对上述实验进行了改动，他的做法是将步骤Ⅰ中的稀盐酸换为稀硝酸．故填：步骤Ⅰ中加入的稀盐酸引入了氯离子，影响了氯化钾的检验；将步骤Ⅰ中的稀盐酸换为稀硝酸．。

【天天练·阅读理解第一期——环境描写】1.答题模板：①交代了故事发生的背景，突出了...的特点。

（首段中出现了环境描写或是天气，要答出这个作用。

）②渲染了...的气氛。

③烘托了人物...的心情。

④衬托出主要人物...的性格特点或品质。

⑤推动故事情节的发展，为下文...做铺垫。

（小说中的环境描写，经常体现这个作用）⑥揭示出...的主题。

（小说文体常答这点，初中很少考查）2.例题讲解：（由于阅读题量较大，在word文件显示，同时便于大家保存）3.题型训练：（由于阅读题量较大，在word文件显示，同时便于大家保存）2.例题讲解：①交代了故事发生的背景，突出了……的特点。

（首段中出现了环境描写或是天气，要答出这个作用。

）《孔乙己》开头用了一段文字描写鲁镇酒店的格局，特别是两类顾客的衣着和喝酒方式的差异。

揭示了清末社会阶级对立、贫富悬殊等情况，交代了故事发生的背景。

《孔乙己》社会背景的描写为我们展现了孔乙己活动的舞台，注定下文中他不被人同情，而被冷馍社会吞噬的悲剧命运。

鲁镇的酒店的格局，是和别处不同的：都是当街一个曲尺形的大柜台，柜里面预备着热水，可以随时温酒。

做工的人，傍午傍晚散了工，每每花四文铜钱，买一碗酒，------这是二十多年前的事，现在每碗要涨到十文，------靠柜外站着，热热的喝了休息；倘肯多花一文，便可以买一碟盐煮笋，或者茴香豆，做下酒物了，如果出到十几文，那就能买一样荤菜，但这些顾客，多是短衣帮，大抵没有这样阔绰。

只有穿长衫的，才踱进店面隔壁的房子里，要酒要菜，慢慢地坐喝。

《孔乙己》节选②渲染了的气氛。

例如《故乡》第二小节：“冷风吹进船舱中，呜呜的响，从缝隙向外一望，苍黄的天底下，远近横着几个萧索的荒村，没有一些活气。

”这段是环境描写，刻画了故乡深冬严寒的特点，描绘了故乡萧瑟的景象，渲染了农村萧条、荒凉、沉寂的气氛，烘托出“我”悲凉的心境，荒凉的景象与主人公悲凉的心境融为一体。