限时训练(25)
高考化学选择题专题
潮阳一中明光学校高考化学选择题限时训练25（限时40分钟）----------离子共存、离子方程式一、单项选择题(每小题4分）1、（2010广东理综7）能在溶液中大量共存的一组离子是A . 4NH + 、Ag + 、34PO - 、Cl - B.3Fe +、H +、I -、 3HCO -C.K +、 +Na 、 -3NO 、 -4MnO D.Al 3+、2+Mg 、2-4SO 、 2-3CO2、（2011广东理综8）能在水溶液中大量共存的一组离子是A. H ＋、I ―、NO 3―、SiO 32－B. Ag ＋、Fe 3＋、Cl ―、SO 42―C.K ＋、SO 42－、Cu 2＋、NO 3―D.NH 4＋、OH －、Cl －、HCO 3－3、（2010全国卷1）能正确表示下列反应的离子方程式是A ．将铜屑加入3+Fe 溶液中：3+2+2+2Fe +Cu=2Fe +CuB ．将磁性氧化铁溶于盐酸：+3+342Fe O +8H =3Fe +4H OC ．将氯化亚铁溶液和稀硝酸混合：2++332Fe +4H +NO =Fe +2H O+NO -+↑D ．将铁粉加入稀硫酸中：+322Fe+6H =2Fe 3H ++↑4、（2010天津卷5）下列实验设计及其对应的离子方程式均正确的是A ．用F e C l 3溶液腐蚀铜线路板：Cu + 2F e 3+ ＝ Cu 2+ + 2Fe 2+B ．Na 2O 2与H 2O 反应制备O 2 ：Na 2O 2 + H 2O ＝ 2N a + + 2O H － + O 2↑C ．将氯气溶于水制备次氯酸：C l 2 + H 2O ＝ 2H + + Cl － + ClO －D ．用浓盐酸酸化的K M n O 4溶液与H 2O 2反应，证明H 2O 2具有还原性：2MnO 4-+ 6H + + 5H 2O 2 ＝ 2Mn 2+ + 5O 2↑ + 8H 2O5、（2010安徽卷9）在pH=1的溶液中能大量共存的一组离子或分子是A.Na +、Mg 2+、ClO —、NO 3—B. Al 3+、 NH 4+、 Br - 、Cl -C. K + 、Cr 2O 72- 、CH 3CHO 、 SO 42-D. Na +、K + 、SiO 32-、Cl -6、（2010上海卷9）下列离子组一定能大量共存的是A ．甲基橙呈黄色的溶液中：I -、Cl -、NO 3-、Na +B ．石蕊呈蓝色的溶液中：Na +、AlO 2-、NO 3-、HCO 3-C ．含大量Al 3+的溶液中：K +、Na +、NO 3-、ClO -D ．含大量OH 一的溶液中：CO 32-、Cl -、F -、K +7、（2010上海卷19）下列反应的离子方程式正确的是A ．苯酚与碳酸钠溶液的反应B ．等体积、等浓度的Ca(HCO 3)2溶液和NaOH 溶液混合223332222Ca HCO OH CaCO CO H O +---++−−→↓++C ．硫酸亚铁溶液中加入用硫酸酸化的过氧化氢溶液2222222Fe H H O Fe H O +++++−−→+D ．淀粉碘化钾溶液在空气中变蓝2I - + O 2 + H 2O = I 2 + 2OH -8、（2010江苏卷3）下列离子方程式表达正确的是A ．用惰性电极电解熔融氯化钠：2222Cl +2H O Cl +H +2OH --=↑↑通电B ．用氢氧化钠溶液除去铝表面的氧化膜：2322Al O 2OH 2AlO H O --+=+C ．用稀氢氧化钠溶液吸收二氧化氮：2322OH 2NO NO +NO +H O --+=↑D ．用食醋除去水瓶中的水垢：233322CO +2CH COOH 2CH COO CO H O --=+↑+9、（2010江苏卷6）常温下，下列各组离子在指定溶液中能大量共存的是A ．pH=1的溶液中：2+Fe 、3NO -、24SO -、Na +B ．由水电离的()141H 110mol L c +--=⨯⋅的溶液中：2+Ca 、K +、Cl -、3HCO - C ．()()12H /OH 10c c +-=的溶液中：4NH +、3Al +、3NO -、Cl -D ．()31Fe 0.1mol L c +-=⋅的溶液中：K +、ClO -、24SO -、SCN -10、（2010浙江卷12）下列热化学方程式或离子方程式中，正确的是A.甲烷的标准燃烧热为-890.3kJ·mol -1，则甲烷燃烧的热化学方程式可表示为：CH 4(g)+2O 2(g)=CO 2(g)+2H 2O(g) △H=-890.3kJ·mol -1B. 500℃、30MPa 下，将0.5mol N 2和1.5molH 2置于密闭的容器中充分反应生成NH 3(g)，放热19.3kJ ，其热化学方程式为：N 2(g)+3H 2(g)= 2NH 3(g) △H=-38.6kJ·mol -1C. 氯化镁溶液与氨水反应：222()Mg OH Mg OH +-+=↓D. 氧化铝溶于NaOH 溶液：Al 2O 3 + 2OH - = 2AlO 2- + H 2O11、（2010四川理综卷9）下列离子方程式书写正确的是A.向明矾溶液中加入过量的氢氧化钡溶液：322442222422Al SO Ba OH BaSO AlO H O +-+--+++=↓++B.向氢氧化亚铁中加入足量的稀硝酸：()22222Fe OH H Fe H O +++=+ C.向磷酸二氢铵溶液中加入足量的氢氧化钠溶液：432NH OH NH H O +-+=⋅D.向2CH BrCOOH 中加入足量的氢氧化钠溶液并加热：222CH BrCOOH OH CH BrCOO H O ∆--+−−→+12、（2011江苏高考4）常温下，下列各组离子在指定溶液中一定能大量共存的是A.1.0 mol·L －1的KNO 3溶液：H ＋、Fe 2＋、Cl －、SO 42－B.甲基橙呈红色的溶液：NH 4＋、Ba 2＋、AlO 2－、Cl －C.pH ＝12的溶液：K ＋、Na ＋、CH 3COO －、Br －D.与铝反应产生大量氢气的溶液：Na＋、K＋、CO32－、NO3－13、（2011安徽高考8）室温下，下列各组离子在指定溶液中能大量共存的是A.饱和氯水中Cl－、NO3－、Na＋、SO32－B.c(H＋)=1.0×10－13mol/L溶液中C6H5O－、K＋、SO42－、Br－C.Na2S溶液中SO42－、K＋、Cl－、Cu2＋D.pH=12的溶液中NO3－、I－、Na＋、Al3＋14、(2011全国II卷11)将足量CO2通入下列各溶液中，所含离子还能大量共存的是A．K＋、SiO32－、Cl－、NO3－B．H＋、NH4＋、Al3＋、SO42－C．Na＋、S2－、OH－、SO42－D．Na＋、C6H5O－、CH3COO－、HCO3－15、（2011四川）甲、乙、丙、丁四种易溶于水的物质，分别由NH4＋、Ba2＋、Mg2＋、H＋、OH－、Cl－、HCO3－、SO42－中的不同阳离子和阴离子各一种组成。
九年级英语限时训练(附参考答案)
九年级英语限时训练（附参考答案）一．根据句意及首字母和汉语提示完成句子。
1.The official newspaper c_________the news of Tiangong-I,for it took a big step forward into space.2.The idiom(成语）:“Meng zi’s mother makes three moves”tells of a mother who did all she could to provide the best e_________for her child.3.The young lady w _______hair is blond comes from Australia.4.Sometimes, you won’t know the true value of a moment u_______it becomes a memory.5.Good _______(发音）will impress others and make yourself confident.二．完形填空（共10小题；每小题1分，满分10分）There was a garden full of plants. In the corner of the garden, a 6 rose grew. She was the most beautiful flower there. She was as white as snow, 7 the plants around her were shocked at her beauty. But the white rose couldn’t see 8 , so she didn’t know how beautiful she was.Sometimes, she was even a little envious (羡慕的) of the sunflowers around her. She hoped that she could be as 9 as them.One sunny day, a girl went into the 10 . She walked around and was amazed at the beauty of na ture. Suddenly, she saw the white rose. “It hasn’t rained for days,” said the girl. “And the weather report says it will continue to be 11 for a few days. If the rose stays here, it will 12 soon. I’ll take it home and put it in my beautiful vase(花瓶).”The white rose was put in a lovely vase by the window. From the reflection in the window, the white rose saw herself for the 13 time. “Is that me?” she was shocked. “Till now I didn’t 14 how beautiful I looked.”Sometimes, we think other people are very great and 15 know our own advantages. This makes us feel less confident of ourselves. Look into your heart, and you’ll find how great you are.6. A. white B. red C. blue7. A. or B. but C. and8. A. herself B. himself C. yourself9. A. quiet B. lovely C. lonely10. A. park B. corner C. garden11. A. rainy B. cloudy C. sunny12. A. leave B. die C. cancel13. A. first B. second C. third14. A. improve B. realize C. suppose15. A. always B. usually C. never三．综合填空（共10小题；每小题2分，满分20分）根据短文内容，用方框中所给词语的适当形式填空，使文章通顺、完整。
九年级英语限时训练(附参考答案)
九年级英语限时训练（附参考答案）（满分28分时间25分钟）一、还原型阅读（共5小题；每小题2分，满分10分）二、阅读理解（共4小题；每小题2分，满分8分）In 1987 a small company named Huawei was started in Shenzhen.After more than 30 years of development, the company has now beaten Apple and become the world's second largest maker of smartphones. It has also become the world's supplier(供应者)of 5G.In China and even in the world.Huawei is a wonder. Although it started producing mobile phones not many years ago,it has become one of the most famous phone companies.But recently,Huawei faces some difficulties. The US government made a law to stop its sales in America. American officials said Huawei gave information that it collected to the Chinese government. At the same time, the US government planned to stop selling parts and services to Huawei. They believed that Huawei's business would be hurt this way.“We have never received such a request from the Chinese government and we have never tried to get into other systems to collect information," Ren Zhengfei, Huawei's president said. "The law would have little effect on our company. Huawei has enough ability to deal with the problems," Ren added.In an interview several years ago,Ren Zhengfei said,“I started Huawei with only £4000 at the beginning,but now it has become a 100 billion company. The experience was not as romantic as you imagine.Facing the law of the US,Huawei is growing. Huawei's smartphone sales around the world rose 50 percent compared with a year earlier in the first three months of2019. At the same time,sales from both Samsung and Apple fell. So far Huawei has grown into the world's largest telecommunication equipment supplier(供应商), selling in 170 countries. It may beat Samsung as the largest smartphone maker in the near future.6. How many kinds of smartphones are mentioned in total in this passage?A. One.B. Two.C. Three.D. Four.7. Which of the following sentences is TRUE according to the passage?A. Huawei collected the information for the Chinese government.B. Ren Zhengfei started Huawei with only L4000 in1987.C. Huawei has beaten Samsung.a South-Korea phone maker so far.D. Huawei has developed its business smoothly.8. What does the underlined word "romantic”in Paragraph 4 mean in Chinese?A.浪漫的B.现实的C.成功的D.麻烦的9. The last paragraph mainly tells us.A. Huawei has become one of the most famous phone companies.B. Huawei has become the largest maker of smart phones in the world.C. Huawei has got into some systems of the US.D. Huawei is full of hope and must succeed in the future .三、阅读表达（共5小题，每小题2分，满分10分）阅读下面的短文，并根据短文后的要求答题。
2021年中考总复习25分钟限时规范训练(含答案)限时训练26 用药与急救 健康地生活
不要因为长期埋头科学，而失去对生活、对美、对待诗意的感受能力。
——达尔文2021年中考总复习25分钟限时规范训练（含答案）姓名：班级：限时训练26用药与急救健康地生活(时间25分钟分值19分)一、选择题(每小题1分，共10分)1．在拨打“120”急救电话时，你必须讲清楚的三点是（A）A．你的地址电话病人症状B．你的单位地址病人症状C．天气情况地址病人症状D．身份证号发病原因发病症状2．东汉时期的张仲景在《金匮要略》中记载：“救自缢死……一人以手按据胸上，数动之。
”其方法与现今的________急救措施相似（D）A．人工呼吸B．按压止血C．开放气道D．胸外心脏按压3．对非处方药的说法不正确的是（D）A．非处方药不需要凭医师处方即可购买B．标有“OTC”的药品是非处方药C．在使用非处方药前要仔细阅读使用说明D．非处方药对人体没有毒副作用4．“珍爱生命，健康生活”是一个永恒的主题。
下列说法错误的是（D）A．远离烟、酒，拒绝毒品B．经常玩手机、熬夜上网，都属于不健康的生活方式C．每天锻炼一小时，幸福生活一辈子D．清华大学在学生中开展的“刷卡”锻炼活动，能提高学生对所有疾病的免疫力5．连花清瘟胶囊对治疗新型冠状病毒肺炎有一定的辅助作用。
下列有关药品说明书的理解正确的是（A）A.属于非处方药B．可治疗风寒感冒C．首次服用药量可加倍D．中成药无毒副作用，可以长期服用6．生活中，正确的急救方法往往能在危急时刻挽留生命。
以下各种急救的做法中正确的是（A）A．对心跳骤停者进行胸外心脏按压B．动脉出血在远心端止血，并拨打“120”C．运动时发现人骨折后立即把患者移动到阴凉处休息D．高楼发生火灾，赶快从窗户跳下7．某同学为夏令营设计的一份意外处理预案，不合理的是（C）A．表皮轻微擦伤涂碘伏B．表皮轻微烫伤立即局部冷却，再消毒处理C．腹泻则大剂量服用消炎药D．流浪狗咬伤反复冲洗伤口，并及时就医8．吸烟有害健康，室内公共场所禁止吸烟。
九年级英语限时训练(附参考答案)
九年级英语限时训练（附参考答案）（满分35分时间25分钟）一、单词拼写（共5小题；每小题2分，满分10分）根据句意和首字母或汉语提示，将单词的正确形式完整地写在答题纸相应的位置上。
1. If it rains tomorrow, you could go to the museum i___________.2. Do you know who is the g___________ writer since Shakespeare in the English language?3. How much time do you spend ___________（练习）English every day?4. Could you tell me where I can c___________ a bus going downtown?5. If possible, a___________（避免）stopping under trees, light posts, or power lines.二、完形填空（共10小题；每小题1分，满分10分）阅读下面短文，掌握其大意，然后从每题所给的A、B、C、D四个选项中，选出能填入短文相应空白处的最佳选项，并在答题卡上将该项涂黑。
Many people have to work at the weekends．Some people do not mind．Other people think it’s 6 ．One man thinks that working at the weekends can be 7 ．He is George Smith．Mr．Smith works in an office, in Brighton, England．One Saturday, May 24, 1996, he went to the office to do some work．After he 8 the lift, it stopped between floors．Mr．Smith could not get out of the lift．He began to shout, but 9 heard him．Then Mr．Smith remembered that it was a holiday in England．No one was going to come to work 10 Tuesday．There was 11 for Mr．Smith to do．He had to wait until one of his workmates came to work and found him．With nothing do 12 , Mr．Smith was very hungry and had to sleep most of the time．Early on Tuesday morning, one of his workmates came to work and found the lift was not 13 ．When the lift was opened, Mr．Smith came out, cold, weak, and tired．He had been in the lift for 14 hours!Now Mr．Smith says, “I only use lifts if they have 15 in them．”6. A.glad B.terrible C.good eful7. A.dangerous B.happy C.angry D.free8. A.got off B.got into C.got out of D.got to9. A.someone B.everyone C.no one D.either10. A.on B.to C.from D.until11. A.nothing B.something C.anything D.everything12. A.read or write B.eat or drink C.cook D.know the time13. A.there B.closed C.working D.here14. A.nearly 24 B.abut 40 C.more than 60 D.over 9415.A.pans B.beds C.exits D.telephones三、阅读表达共6小题；71-73小题，每小题2分；74-76小题，每小题3分，满分15分）阅读下面的短文，并根据短文后的要求答题。
宁德市高级中学2015届高考化学选择题专项限时训练系列套题
宁德市高级中学2015届高考化学选择题专项限时训练系列套题25专题13 有机化学A【说明】每组选择题共7题，每题只有1个选项符合题意，每题6分，共计42分6．（2011福建高考）下列关于有机化合物的认识不正确．．．的是A．油脂在空气中完全燃烧转化为水和二氧化碳B．蔗糖、麦芽糖的分子式都是C12H22O11，二者互为同分异构体C．在水溶液里，乙酸分子中的—CH3可以电离出H＋D．在浓硫酸存在下，苯与浓硝酸共热生成硝基苯的反应属于取代反应7．（2012·福建高考）下列关于有机物的叙述正确的是A．乙醇不能发生取代反应B．C4H10有三种同分异构体C．氨基酸、淀粉均属于高分子化合物D．乙烯和甲烷可用溴的四氯化碳溶液鉴别8.(2013年福建理综,7,6分)下列关于有机化合物的说法正确的是A.乙酸和乙酸乙酯可用Na2CO3溶液加以区别B.戊烷(C5H12)有两种同分异构体C.乙烯、聚氯乙烯和苯分子中均含有碳碳双键D.糖类、油脂和蛋白质均可发生水解反应9.(2014年福建理综)下列关于乙醇的说法不正确的是A.可用纤维素的水解产物制取B.可由乙烯通过加成反应制取C.与乙醛互为同分异构体D.通过取代反应可制取乙酸乙酯10.(2014年浙江理综)下列说法正确的是A.乳酸薄荷醇酯()仅能发生水解、氧化、消去反应B.乙醛和丙烯醛()不是同系物,它们与氢气充分反应后的产物也不是同系物C.淀粉和纤维素在酸催化下完全水解后的产物都是葡萄糖D.CH 3COOCH2CH3与CH3CH2COOCH3互为同分异构体,1H NMR谱显示两者均有三种不同的氢原子且三种氢原子的比例相同,故不能用1H NMR来鉴别11.(2014年山东理综)苹果酸的结构简式为,下列说法正确的是A.苹果酸中能发生酯化反应的官能团有2种B.1 mol苹果酸可与3 mol NaOH发生中和反应C.1 mol苹果酸与足量金属Na反应生成1 mol H2D.与苹果酸互为同分异构体12.(2013年山东理综)化学与生产和生活密切相关,下列说法正确的是A.聚乙烯塑料的老化是因为发生了加成反应B.煤经过气化和液化等物理变化可转化为清洁燃料C.合成纤维、人造纤维及碳纤维都属于有机高分子材料D.利用粮食酿酒经历了淀粉→葡萄糖→乙醇的化学变化过程宁德市高级中学2015届高考化学选择题专项限时训练系列套题26专题13 有机化学B【说明】每组选择题共7题，每题只有1个选项符合题意，每题6分，共计42分6.(2014年北京理综)下列说法正确的是A.室温下,在水中的溶解度:丙三醇>苯酚>1氯丁烷B.用核磁共振氢谱不能区分HCOOCH3和HCOOCH2CH3C.用Na2CO3溶液不能区分CH3COOH和CH3COOCH2CH3D.油脂在酸性或碱性条件下均可发生水解反应,且产物相同7.(2013年新课标全国理综Ⅰ)香叶醇是合成玫瑰香油的主要原料,其结构简式如图所示。
【江西专用】2014届高考语文二轮复习高频考点训练(25)及答案解析
高频考点训练(二十五)时间：25分钟分值：100分每日必练 15分钟限时训练1．(2013·江苏省徐州市考前模拟)下列词语中加点的字，每对读音都相同的一组是( )A．仓猝．/憔悴．一摞．/落．脚点契．合/雕栏玉砌．B．弓弦．/船舷．坼．裂/开小差．强．迫/强．词夺理C．怂．恿/悚．然干涸．/和．稀泥秕．谷/如丧考妣．D．危殆．/怠．慢皎．洁/广角．镜蒹葭．/汗流浃．背解析A．cù/cuì，luò/luò，qì/qì。
B.xián/xián，châ/chāi，qiǎng/qiǎng。
C.sǒng/sǒng，hã/huò，bǐ/bǐ。
D.dài/dài，jiǎo/jiǎo，jiā/jiā。
答案 D2．(2013·江西省临川一中最后一次模拟)下列各组词语中没有错别字的一项是( ) A．编纂兰天蔚然成风诙谐幽默B．瞭望重叠杳无音信颗粒归仓C．赝品痉孪心劳力拙知书达礼D．弦律蛰伏人参鹿茸舐犊情深解析A．“兰天”改为“蓝天”。
C.“痉孪”改为“痉挛”。
“知书达礼”改为“知书达理”。
D.“弦律”改为“旋律”。
答案 B3．(2013·云南省部分名校第二次统一考试)下列各句中，加点的成语使用不恰当的一项是( )A．北京时间2月25日上午，第八十五届奥斯卡金像奖颁奖典礼在洛杉矶杜比剧院落幕，李安凭借《少年派的奇幻漂流》再次获得最佳导演的称号，全场沸腾，人言啧啧．．．．，李安再次被媒体关注。
B．王珞丹是个胸无城府．．．．的年轻演员，从她出道到现在，她得到了许多光环，可是她的出言无忌，却给她惹来了很多麻烦。
C．春节期间，笼罩京津冀等地区的雾霾还没散去，多地地下水污染又激起轩然大波．．．．。
D．有关钓鱼岛争端不断升级，中国海监船继续在钓鱼岛领海内巡航，日方采取措施，主动出击，日舰机近距离跟踪干扰，媒体有关钓鱼岛问题会擦枪走火．．．．的议论不断。
高三英语二轮复习阅读理解限时强化练习25(含答案版)
新高考高中阅读强化限时训练25阅读理解+七选五（含参考答案）限时：35分钟满分：50分阅读（共两节，满分50 分）第一节（共15 小题；每小题2.5 分，满分37.5 分）AThe time may soon come when we say goodbye to most of the world’s languages. Today humans express themselves in over 6,000 different languages. But that is quickly changing. Many scientists say that over half of these languages will disappear within the next 50 years. After 100 years, the languages used in the world will not be more than 20.Why? It is because people from different cultures live and work together much more often than before. This brings changes. The languages of the world’s main culture are replacing the languages of the smaller cultures. Most international trade takes place in world languages such as English. People respect their own cultures and traditions, but when it comes to getting a job, knowing a world language is often necessary. It may mean the difference between success and failure.Technology works on the change of languages in an even more amazing way. Modern media such as radio and television give young people in developing countries much knowledge about the world. But this knowledge doesn’t come in words from the mouths of their parents or the elders in their neighborhood. It usually comes in the language of a different culture.People in different cultures think it good for them to share a popular language. They can quickly share ideas and work together. Knowing the same language means easier communication and is a basis for trust.Is the death of a small local language such a terrible thing? The answer is maybe. Many cultures may have words for many useful things we know nothing about. If their languages die, their valuable wisdom may be lost forever. The future of the world’s language depends on our actions now. Will we protect endangered languages or allow them to quietly disappear?Time will have the last word.( ) 1. Scientists say that within 50 years, perhaps, there will be only _______languages in the world.A. 4,000B. over 3,000C. around 3,000D. no more than20( ) 2. In “the languages of the world’s main culture s are replacing the languages of the smaller cultures.” the verb “replace” means “_______”.A. to put something back into a correct placeB. to use a second thing in place of the first thingC. to find good place for somethingD. to decide how important something is( ) 3. The passage says that if all the people in the world knew a major world language, _______.A. radio and television would all use the languageB. it would be easier for them to share their ideasC. lesson s at schools would be taught in the languageD. people would respect their own culture more参考答案：CBBBHave you wondered why different animals or pests have their particular colours? Colours in them seem to be used mainly to protect themselves.Birds, especially seagulls are very fond of locusts (飞蝗), but birds can’t easily catch locusts because locusts change their colours together with the change of the colour of crops. When crops are green, locusts look green. But when crops are ripe, locusts take on exactly the same brown colour as crops have. Some other pests with different colours from plants are usually easily found and eaten by their enemies. So they have to hide themselves in terror for lives and appear only at night.If you study the animal life in any part of the world, you will find the main use of colouring is to protect them. Bears, wolves and other beasts move quietly through forests. They are usually invisible to the eyes of hunters, because they have the colour much like the barks of trees.An even more strange act remains to be noticed. A kind of fish living in seas can send out a kind of very black liquid when it faces danger. While the liquid is over, its enemies cannot find it, and it quickly swims away. Thus, it has existed up to now though it is not powerful at all.( ) 4. Locusts are pests but they aren’t easily wiped out by their enemies because _______.A. they are powerful enoughB. they are dangerous to their enemiesC. they take on the same colours as cropsD. they fly very fast( ) 5. The pests that have different colours from plants usually appear at night because _______.A. their enemies can easily find them and eat themB. they have the habit of coming out in darknessC. it’s easy for them to destroy plants in darknessD. birds take their rests when night comes( ) 6. What does the underlined word “invisible” in Paragraph 3 mean?A. Can’t be seen.B. Can be seen.C. Can’t move.D. Can’t change.( ) 7. A certain fish living in seas has lived through millions of years because_______.A. it is the most powerful in the seaB. no other fishes can swim as fast as it canC. it can send out a kind of liquid which makes its enemies unable to find itD. the liquid it sends out can kill its enemies参考答案：CAACCCaptain James Cook was a great explorer. Before he started exploring, maps of the Pacific Ocean were almost empty. He visited hundreds of islands across the Pacific Ocean and put them in the correct places on the map. He made maps of the coastlines of Australia and New Zealand. James Cook was born in England in 1728. His parents were poor farm workers. When James was 18, he found a job on a coastal ship. He worked on the ship until he was 27 years old, and then he joined the navy. He fought in Canada in a war against France, and he mapped some of the eastern coasts of Canada. In 1768 King George made him Captain of a ship and sent him to the Pacific. He was gone for nearly three years. When he returned, he was regarded as a national hero.He started his third voyage in 1776. On this trip he visited Hawaii. He was the first European to set foot on this beautiful island. Then he mapped the western coastof North America. After that he returned to Hawaii. Unfortunately there was some trouble between the Hawaiians and the white men and they started fighting. In the end Captain was killed in a clash with the local.( ) 8. In which order did James Cook do the following things?a. Fought against France.b. Made maps of some of the eastern coast of Canada.c. Mapped the coast lines of Australia and New Zealand.d. Mapped the coast of North America.e. Was made Captain of a ship.f. Work on a coastal ship.A. f a b e d cB. f a b d e cC. f a b e c dD. a b e c f d( ) 9. He started exploring when _______.A. he worked on a coastal shipB. he was 18 years oldC. he was sent to the PacificD. he served in the navy( ) 10. Which of the following is NOT true?A. He made the first maps of the Pacific Ocean.B. He went on three long important voyages in his life.C. He was the first English man to reach Hawaii.D. He was respected by his people.( ) 11. He was considered a national hero because of _______.A. his experience in CanadaB. his being the first European to visit HawaiiC. his heroic deathD. his devotion to exploration on the Pacific Ocean参考答案：CDADDWhen you search Google or use Amazon, you might assume the results you see are the same as those viewed by your friends, family and other Internet users. But you’d be wrong. Websites and social networks track your location and search history and make assumptions about your age, race, sex and political views. They then show ads they believe to be the most relevant, in order to maximize clicks, but personalizewhich results you see by eliminating what they think is irrelevant.This is sold to the public as positive, making each web session relevant and interesting, yet it is leading researchers to fear this could widen divides between the North and South, rich and poor, and young and old. For example, in terms of wealth, if users are only ever shown particular products and job advertisements based on how much they earn or where they live, these users will never be given the opportunities to increase their wealth, or how much they spend on items.Princeton University has created bots（自动程序）, each with their own fake profiles. These bots have different fake ages and sexes, earn different levels of money, are virtually(虚拟地) based in various locations around the world and have different interests. By using these bots to scan and research the web, the researchers hope to create a picture of not only what each of them sees, but also what sites they are missing out on.According to lead researcher, Arvind Narayanan, “Our goal is a web privacy census（普查）which will be a comprehensive map of who are collecting what information, what they are inferring from it, and who they are sharing it with. It is an important step in our final goal of figuring out how users are treated based on that information.”Personalization also has its benefits. Shopping sites such as Amazon and eBay can scan a user’s search and purchase history to offer suggestions. This can help find similar, cheaper items or items that are more suited to their needs at a glance. It’s also possible to disable personalized ads and results. Google’s search engine lets you switch off personalization, for example.Researchers from the Universitat Pompeu Fabra in Barcelona and Yahoo felt the issue was so potentially damaging, and they have also created a way to “burst the filter(过滤) bubble”. They believe that just because people have opposing views on certain topics it doesn’t mean they won’t share interests with others.( ) 12. The underlined word “eliminating” in Paragraph 1 probably means“_______”.A. decoratingB. removingC. personalizingD. protecting( ) 13. Princeton University created bots to ______.A. explain why different websites are personalizedB. offer users some advice on how to protect privacyC. assess how personalization is affecting Internet usersD. stress the advantages and disadvantages of personalization of websites( ) 14. Which of the following websites have done something to cut off personalization?A. Google and YahooB. eBay and GoogleC. Amazon and eBayD. Amazon and Yahoo( ) 15. What is this passage mainly about?A. Different websites are doing something to offer quality service.B. Personalized ads and search results could be creating different web pages.C. Personalization of different sites will lead to users’ privacy being violated.D. Personalization of shopping sites makes online shopping more convenient.参考答案：BCAB第二节（共5 小题；每小题2.5 分，满分12.5 分）What makes one person more intelligent than another? What makes one person a genius, like the brilliant Albert Einstein, and another person a fool? Are people born intelligent or stupid, or is intelligence the result of where and how you live? 16 We know, however, that just being born with a good mind is not enough. In some ways, the mind is like a leg or an arm muscle. 17 Mental exercise is particularly important for young children. Many child psychologists think that parents should play with their children more often and give them problems to think about. 18 If, on the other hand, children are left alone a great deal with nothing to do, they are more likely to become dull and unintelligent.19 According to some psychologists, if parents are always tellinga child that he or she is a fool or an idiot, then the child is more likely to keep doing silly and foolish things. So it is probably better for parents to say very positive things to their children, such as “That was a very clever thing you did.” or“20 ”A. A healthy body contributes to one's intelligence.B. Parents should also be careful about what they say to young children.C. What people want to express is like this.D. The children are then more likely to grow up bright and intelligent.E. It needs exercise.F. You are such a smart child.G. These are very old questions and the answers to them are still not clear.参考答案：GEDBF。
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2.如果命题 p : x 1 y 2 0 ，命题 q : x 1 y 2 0 ，那么命题 p 是命题 q 的（ ）.
A.充分不必要条件 C.充要条件
B.必要不充分条件 D.既不充分也不必要条件
π
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y
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1 ln x, x 0
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（ ）.
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二、填空题：本大题共 6 小题，每小题 5 分，共 30 分. 把答案填在题中的横线上.
11.若双曲线
a2
y2
b2
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3
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b
c
21
12. 在 △ABC 中， a,b, c 分别为角 A, B,C 的对边，若
，且 cos A ,b ，则 a 的
cos B cos C
32
值为___________．
13.在△ABC 中， BD 2CD ，若 AD AB AC ，则 4 ___________．
14. 在正方体 ABCD A1B1C1D1 中，点 Q 是 CC1 的中点，点 F 是侧面 BCC1B1 内的动点且 A1F∥平面
AD1Q ，则 A1F 与平面 BCC1B1 所成角的正切值的取值范围为
3
π
B.向左平移 个单位长度
3
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C.向右平移 个单位长度
6
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D.向左平移 个单位长度
6
4.某程序框图如图所示，程序运行后，输出 s 的结果是（ ）.
开始
i=1 ,s=0
否 i <20 ?
是
i=i+2
输出s
s=s+i
结束
A.143
2 的直线与圆 x2 y2 6x 2 y 1 0 交于 A, B 两点，则 AB 的最小值是（ ）.
限时训练（二十五）
一、选择题：本大题共 8 小题，每小题 5 分，共 40 分. 在每小题给出的四个选项中，只有一项是符合 题目要求的.
1.已知 a i1 i b ，其中 i 为虚数单位，则实数 a,b 的值分别为（ ）.
A. a 1,b 1
B. a 1,b 2
C. a 1,b 1
D. a 1,b 2
9.已知集合 A x x2 5x 6 0 , B x x2 2x 8 0 ，则 A B ___________．
x 3y 30 10.若变量 x，y 满足约束条件 2x y 3 0 ，则 z x y 的最大值为____________.
x y 1 0
x2