海文考前必看_D_167291197356181158
高考数学考前30天---选择题专训(三)
2019年高考数学考前30天---选择题专训（三）选择题：本大题共12小题，每小题5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．已知集合，，则（ ） A ． B ．C ．D ．【答案】B2．已知复数，，的虚部为（ ） A ． B ． C ．D ．【答案】C3．函数的图象为，命题图象关于直线对称；命题由的图象向右平移个单位长度可以得到图象；则下列命题为真命题的是（ ） A ． B ．C ．D ．【答案】B4．在内随机地取一个数，则事件“直线与圆有公共点”发生的概率为（ ） A ．B ．C ．D【答案】A5．如图，网格纸上小正方形的边长为1，粗线画出的是某三棱锥的三视图，则此几何体的体积为（ ） A ．B ．C ．D ．{}270A x x =∈-<N {}2340B x x x =--≤A B =I {}1,2,3{}0,1,2,372x x ⎧⎫⎨⎬⎩⎭≤702x x ⎧⎫<⎨⎬⎩⎭≤132i z =+22i z =-12z z ⋅1-i -1i π()3sin(2)3f x x =-C :p C 11π12x =:q x y 2sin 3=π3C q p ∧()p q ∧⌝()p q ⌝∨()p q ⌝∨(k y kx k =+()2211x y -+=131412422343【答案】D6．设点是平面区域内的任意一点，则的最小值为（ ）A ．B ．C ．D ．【答案】B7．执行如图所示的程序框图，输出，则（ ） A ．9B ．10C ．11D ．12【答案】B8．函数的图象大致是（ ）(,)P x y 010220x x y x y ⎧⎪++⎨⎪++⎩≤≤≥224x y x +-121925S ()2log 1S +=()sin ln sin x x f x x x -⎛⎫= ⎪+⎝⎭【答案】A9．已知，若，，（ ） A ．B ．C ．D ．【答案】C10．正三棱柱的顶点都在同一个球面上，若球的半径为4，则该三棱柱的侧面面积的最大值为（ ） A ．B ．C ．D ．【答案】A11．设双曲线的右焦点为，过点作与轴垂直的直线交两条渐近线于，点，且与双曲线在第一象限的交点为，设为坐标原点，若，，该双曲线的离心率为（ ）A ．B ．C ．D ．【答案】C1>>b a 10log log 3a b b a +=3b a a b ==b 232327172831576722221(0,0)x y a b a b-=>>F F x l A B P O (,)OP OA OB λμλμ=+∈R u u u r u u u r u u u r 320λμ=353512．已知函数，若的解集中有且只有一个正整数，则实数的取值范围为（ ）A ．B ．C ．D ．【答案】A1()()e 22x f kx x x =+-()0f x <k 22121,e 4e 2⎡⎫--⎪⎢⎣⎭22121,e 4e 2⎛⎤-- ⎥⎝⎦322121,e 6e 4⎡⎫--⎪⎢⎣⎭32121,e 6e 2⎡⎫--⎪⎢⎣⎭。
高考考前30天三轮专题提分必练绝密之十七
专题限时训练(十七)(限时：30分钟)(一)My Teacher in the School of LifeI spent the opening day of school this year at DeMatha Catholic high School in much the same way I spent the first day of classes exactly 30 years ago; I __1__ in Dr Charles E. Offutt’s British literature class，listening to him __2__ what his seniors would learn and get them excited about the journey they would __3__ .I’m the principal(校长) of the school now，but for a few minutes I was back in 1975，__4__ what the future held.I have been learning from Dr Offutt for 30 of the 51 years he has been teaching at DeMatha. he not only taught me to think，he __5__ me，as much by example as __6__，that it was my moral duty to do so and to serve __7__ .Neither of us could know how our __8__ would develop over the years. When I first came back to DeMatha to teach English，I worked for Dr Offutt，then the department chair. After several years，I was __9__ department chair，and our relationship changed __10__. I thought that it might be __11__chairing the department，since all of my former English teachers were still there，but Dr Offutt __12__ me throughout. he knew when to give me __13__ about curriculum，texts and personnel，and when to let me design my own course.In 1997，I needed his advice about leaving DeMatha to become principal at another school. If he had asked me to stay at DeMatha，I might have. __14__，he encouraged me to seize the new __15__ .二轮精品提分必练()1. A．stood B．satC．taught D．talked()2. A．explain B．predictC．speak D．teach()3. A．keep B．achieveC．choose D．take()4. A．preparing B．discoveringC．wondering D．realizing()5. A．assisted B．remindedC．advised D．convinced()6. A．words B．actionC．explanation D．models()7. A．the others B．everyoneC．others D．anyone()8. A．relationship B．positionC．situation D．condition()9. A．pointed B．namedC．given D．taken()10. A．already B．yetC．still D．again()11. A．foolish B．surprisingC. uncertain D．challenging()12. A．promoted B．acceptedC．supported D．welcomed()13. A．advice B．informationC．notice D．thought()14. A．Otherwise B．ThereforeC．Furthermore D．Instead()15. A．choice B．opportunityC．occupation D．possibility()16. A．teacher B．principalC．officer D．clerk()17. A．live B．lookC．depend D．take()18. A．rich B．littleC．valuable D．endless()19. A．Once B．Even ifC．Unless D．Until()20. A．fortunate B．curiousC．innocent D．satisfied(二)Try It a Different WayBobby Moresco grew up in New York’s h ell’s Kitchen，a tough working-class neighborhood on Manh attan’s West Side. By tradition he __1__ have been，like his father or like most of his childhood pals，a construction worker or a policeman. But he wanted __2__ . Attracted by the bright lights from the time Bobby was a teen，he tried to act. “I wasn’t a __3__ actor, but I had a driving need to do something __4__ with my life，” he says.He moved to hollywood，promising to find his __5__ . But he didn’t make __6__ . For almost 10 years，he drove a taxi and worked as a waiter，__7__ at an actors’ works hop that he opened in hollywood. But Moresco kept working at his __8__ career.In 1983 his younger brother was murdered in a mob-linked killing. Moresco moved back to his __9__ neighborhood. In 1988 he finally wrote a play that was __10__ to his life. Called ha lf-Deserted Streets，it was based on his broth er’s__11__ and staged at a small theater. A hollywood producer __12__ to see it and asked him to work on a screenplay.二轮精品提分必练The movie，Crash，__18__ into the theaters in May ，and quietly became both a hit and a critical success. It won three Academy Awards—Best Picture，Best Film Editing and Best Writing.At the age of 54，Bobby Moresco became an __19__ success. “If you have something you want to do in life，don’t think about the problems，” he says，“t hink about the __20__ to get it done. ”()1. A．must B．shouldC．can D．need()2. A．over B．farC．out D．up()3. A．simple B．strictC．firm D．good()4. A．different B．impressiveC．effective D．special()5. A．occasion B．treasureC．fortune D．possibility()6. A．it B．oneC．this D．that()7. A．communicating B．entertainingC．practicing D．volunteering()8. A．afforded B．chosenC．respected D．offered()9. A．early B．wornC．old D．passed()10. A．turned B．pointedC．belonged D．related()11. A．arresting B．injuringC．killing D．shooting()12. A．advised B．happenedC．intended D．planned()13. A．influence B．ambitionC．success D．reputation()14. A．again B．evenC．finally D．still()15. A．before B．whenC．since D．while()16. A．let B．lookedC．took D．turned()17. A．strongly B．hardlyC．deeply D．bravely()18. A．moved B．slippedC．fell D．put()19. A．effortless B．enjoyableC．overnight D．optimistic()20. A．ways B．linesC．manners D．actions二轮精品提分必练专题限时训练(十七)(一)作者从一所学校的普通学生成长为该校的老师，后来又接任校长职务，期间一直得到一个人的帮助，作者为拥有这样的良师而倍感庆幸。
高考数学考前30天---选择题专训(二)
2019年高考数学考前30天---选择题专训（二）选择题：本大题共12小题，每小题5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．设集合{}01M x x =≤≤，{}1N x x =≥，则MN =（ ）A ．{}1B ．{}01x x ≤≤C ．{}11x x x -≤或0≤≤D ．{}10x x x -≤或≥【答案】D 2．若复数1i1i z -=+，则z =（ ）A ．1B ．1-C ．iD 、-i【答案】C3．甲乙两名同学6次考试的成绩统计如下图，甲乙两组数据的平均数分别为甲x 、乙x ，标准差分别为甲σ、乙σ，则（ ）A ．乙甲乙甲，σσ<<x xB ．乙甲乙甲，σσ><x xC ．乙甲乙甲，σσ<>x xD ．乙甲乙甲，σσ>>x x【答案】C 4．已知数列}{n a 为等差数列，且55=a ，则9S 的值为（ ）A ．25B ．45C ．50D ．90【答案】B5．已知2313a ⎛⎫= ⎪⎝⎭，1314b ⎛⎫= ⎪⎝⎭，3log c =π，则a ，b ，c 的大小关系为（ ） A ．c b a >> B ．b c a >> C ．b a c >> D ．a b c >>【答案】D6．一只蚂蚁在边长为4的正三角形区域内随机爬行，则它在离三个顶点距离都大于2的区域内爬行的概率为（ ）A ．31B ．34C 3πD ．14【答案】A7．已知某几何体的三视图如图所示，则该几何体的最大边长为（ ） A ．5B ．6C ．7D ．22【答案】B8．若函数()f x 的定义域为R ，其导函数为()f x '．若()3f x '<恒成立，()20f -=，则()36f x x +＜解集为（ ）A ．(,2)-∞-B ．)2,2(-C ．)2,(-∞D ．),2(+∞-【答案】D9．执行如图的程序框图，则输出的S 值为（ ）A ．1B ．23C ．12-D ．0【答案】D10．在ABC △中，内角A ，B ，C 所对的边分别为a ，b ，c ，已知()()3a b c a b c ab +-++=，且4=c ，则ABC △面积的最大值为（ ）A ．83B ．34C ．32D 3【答案】B11．设函数()()22cos e 2e x x f x x π⎛⎫-π++ ⎪⎝⎭=+的最大值为M ，最小值为N ，则2018)1(-+N M 的值为（ ） A ．1 B ．2C ．20182D ．20183【答案】A12．已知双曲线()222210x y b a a b -=＞＞的左、右焦点分别为()1,0F c -，()2,0F c ．若双曲线上存在点P 使1221sin sin F PF cF PF a ∠=∠，则该双曲线的离心率的取值范围是（ ） A ．()21+B ．)2,+∞C ．)2,21D ．)21,++∞【答案】C。
2024年陕西公务员考试试题及答案
2024年陕西公务员考试试题及答案第一部分常识判断1.生态环境部消息，2023年全国优良天数比例为（），地表水水质优良断面比例达89.4%，均完成年度目标。
A.82.5%B.87.5%C.80.5%D.85.5%【答案】：D2.2024年3月8日从中国海油获悉，在珠江口盆地发现我国首个深水深层油田——（）,探明油气地质储量1.02亿吨油当量，是我国在深水领域自主发现的最大油田。
A.开平南油田B.绥中油田C.流花油田D.东平北油田【答案】：A3.2024年1月11日，2025年第九届亚洲冬季运动会口号、会徽、吉祥物在黑龙江哈尔滨发布。
本届赛会口号为"（）"、会徽"超越"、吉祥物"滨滨"和"妮妮"同步亮相。
这标志着本届亚冬会各项筹备工作进入新的阶段。
A.激情冰雪，亚洲接力B.激情冰雪，亚冬相约C.冰雪同梦，亚洲同心D.冰雪盛宴，亚洲风采【答案】：C4.2024年1月25日，人力资源社会保障部等9部门启动了2024年“（）”，聚焦农村劳动者和有用工需求的用人单位，集中开展引导有序外出、组织招聘用工等服务。
A.春风行动B.猎狐行动1/ 15C.亮剑行动D.硕果行动【答案】：A5.国家能源局发布数据，2023年全社会用电量92241亿千瓦时，同比（）。
A.增长6.7%B.增长6.75%C.增长6.27%D.增长6.84%【答案】：A6.坐地日行八万里，巡天遥看一千河的诗句蕴含的哲学原理是A.物质运动的多样性和静止的单一性的统一。
B.物质运动的绝对与静止的相对性的统一。
C.物质运动的无限性和时空的有限性的统一。
D.物质运动的客观性和时空的主观性的统一。
【答案】：B7.2020年诺贝尔物理奖授予了三位科学家以表彰他们在“黑洞”研究中所作出的奠献，下列关于黑洞的说法正确的是（）。
A.黑洞是一种恒星B.黑洞就是虫洞C.光可以通过黑洞D.黑洞是宇宙中存在的一种天体【答案】：D8.在某市的市场上，如果苹果价格下降能使购买者对苹果的消费支出增加，则苹果的需求价格弹性（）A.单位弹性B.无法确定C.富有弹性D.缺乏弹性【答案】：C9.下列有关“决议”表述不正确的是：2/ 15A.决议的正文是对决议对象的评价和表态B.决议的人称只能有一个，即“会议”C.决议的成文日期，其位置在正文之后D.决议适用于会议讨论通过的重大决策事项【答案】：C10.培育和践行社会主义核心价值观，新闻媒体要发挥（）的主渠道作用。
高考考前30天三轮专题提分必练绝密之二十四
专题限时训练(二十四)(限时：30分钟)(一)A survey done by the University of Michigan shows a big drop in the number of teenagers who say they smoke cigarettes.In the __1__ ，over 44,000 students in grades 8,10 and 12，from 424 schools across the __2__ were asked about their smoking __3__ . The results show that smoking among 8th graders __4__ from 21 percent in ，to 12 percent in . In the same __5__ ，smoking dropped from 30 % to 21% among 10th graders and from 37 % to 30 % among 12th graders.Anti-smoking organizations think educating kids about smoking risks are the __6__ of the drop. “These important __7__ in teen smoking did not just happen by chance，” says study director Lloyd D．Johnston. “A lot of __8__ and organizations have been trying to __9__ the high rates of teenagers.”Others say the __10__ price of cigarettes is an important reason teens are cutting back.__11__ the reason，the drop in teen smoking is good news to everyone，even cigarette-making companies who __12__ their product is only for adults，not kids. Health experts are __13__ paying attention to teenage smoking habits __14__ lifetime smokers often get hooked on smoking at an early age.But some say that the new figures aren’t exactly the cause for __15__ . While it is true __16__ teens are smoking today than five years ago，the __17__ of teen smoking is still higher than it was.Cigarette smoking is the __18__ cause of preventable death and disease in this country. “Our survey __19__ that a lot of teens still do not understand the __20__ of smoking，particularly the younger teens，” Johnston said.()1.A.study B．surveyC．talk D．chart()2.A.country B．schoolC．city D．university()3.A.habits B．numberC．life D．quality()4.A.went up B．came upC．went down D．came over()5.A.period B．gradeC．group D．year()6.A.result B．causeC．reason D．excuse()7.A.figures B．resultsC．habits D．drops()8.A.schools B．teachersC．individuals D．students()9.A.bring down B．bring upC．take off D．get down()10.A.higher B．reasonableC．lower D．normal()11.A.Whichever B．WhateverC．However D．Wherever()12.A.ask B．doubtC．warn D．know()13.A.hardly B．earlyC．eagerly D．particularly()14.A.unless B．untilC．because D．before()15.A.celebration B．sureC．attention D．study()16.A.more B．fewerC．no D．younger()17.A.hope B．speedC．rate D．risk()18.A.leading B．partC．bad D．good()19.A.thinks B．demandsC．tells D．suggests()20.A.dangers B．habitsC．costs D．conditions(二)People who are cheerful and relaxed are less likely to suffer from colds. It’s __1__ that being full of vim(活力) and vigor (精力)helps the body __2__ illnesses，say the researchers from Carnegie Mellon University (CMU) in Pittsburgh.“We need to take more seriously the possibility that a __3__ emotional style is a major player in disease risk，” says psychologist Sheldon Cohen，the study’s lead researcher.In a previous study，Cohen and his colleagues found that people who__4__ to be cheerful and lively were __5__ likely to develop sniffles，coughs，and other cold symptoms(症状).Those findings were interesting，but they didn’t prove that a person’s __6__ affects whether he or she gets sick. __7__，it was still possible that a person’s underlying personality is __8__ matters.__9__ suggests，for instance，that certain people are naturally more likely to be outgoing and __10__，with high self-respect and a sense of __11__ over life. This would mean that who we are，not how we feel，finally decides our __12__ of catching colds.To figure out which mattered more (personality or __13__)，the CMU team __14__193 healthy adults. The researchers talked to each person over the phone every evening for 2 weeks. They told the researchers about the positive and negative __15__ they had experienced that day.The results showed that everyone in the study was__16__ likely to get infected. Their symptoms，however，__17__ depending on the types of emotions that they had reported over the __18__ 2 weeks.Scientists__19__ about whether negative emotions or positive emotions have a stronger __20__ on how healthy we are. For now，it can’t hurt to look on the bright side more often than not!()1.A.necessary B．possibleC．doubtful D．certain()2.A.fight B．reduceC．stop D．remove()3.A.negative B．standardC．passive D．positive()4.A.failed B．managedC．tended D．had()5.A.most B．leastC．quite D．indeed()6.A.thought B．attitudeC．strength D．quality()7.A.Instead B．ThereforeC．Thus D．Still()8.A.that B．whyC．what D．who()9.A.Theory B．ReasonC．Evidence D．Interview ()10.A.active B．optimisticC．brave D．healthy()11.A.control B．humourC．direction D．urgency ()12.A.attitudes B．sufferings C．chances D．emotions ()13.A.qualities B．ideasC．emotions D．conditions ()14.A.examined B．watched C．tested D．interviewed ()15.A.characters B．feelings C．attitudes D．thoughts ()16.A.equally B．lessC．most D．hardly()17.A.occurred B．differedC．suffered D．reduced ()18.A.same B．exactC．valuable D．previous ()19.A.talk B．knowC．argue D．think()20.A.effect B．feelingC．impression D．impact专题限时训练(二十四)(一)本文是说明文。
2024海南公务员考试行测真题(省直)
2024海南公务员考试行测真题（省直）（满分100分时间120分钟）第一部分常识判断1.2024年1月11日，2025年第九届亚冬会口号、会徽、吉祥物正式亮相，吉祥物为东北虎（）。
A.“冰冰”和“妮妮”B.“滨滨”和“翠花”C.“滨滨”和“妮妮”D.“滨滨”和“花花”【答案】：C2.2024年3月13日，中央网信办、农业农村部等11部门近日部署开展第二批国家数字乡村试点工作，试点工作将以（）为单位，分类开展。
A.市或县B.市C.县D.县或镇【答案】：A3.2024年5月18日，2024年"5·18国际博物馆日"中国主会场活动开幕式在陕西历史博物馆秦汉馆举行。
主会场以"（）"为主题，集中展示中国博物馆事业发展最新成果、博物馆主动融入经济社会发展大局所作的独特贡献。
A.博物馆致力于教育和研究B.博物馆的力量C.博物馆：可持续性与美好生活D.博物馆的未来：恢复与重塑【答案】：A4.国家医保局公布，2023年跨省异地就医直接结算1.29亿人次，减少参保群众垫付1536.74亿元，分别较2022年增长（）。
A.210.67%、89.91%1/ 16B.238.67%、86.2%C.205.67%、89.91%D.238.67%、89.91%【答案】：D5.2024年中央一号文件中提到，要构建现代农业经营体系，聚焦解决"谁来种地"问题，对于解决这个问题的表述错误的是（）A.社会化服务为支撑B.以农村合作社为基础C.打造适应现代农业发展的高素质生产经营队伍D.新型农业经营主体为重点【答案】：B6.（）是贯彻政策、统一思想、议事决策、布置工作、沟通信息、统筹协调的有效途径。
A.会议B.命令C.调研D.人际协调【答案】：A7.推进供给侧结构性改革，促进经济提质增效、转型升级，迫切需要（）。
A.依靠科技创新培育发展新动力B.依靠科技创新支撑民生改善C.依靠科技创新突破资源环境瓶颈制约D.依靠科技创新提供强大保障【答案】：A8.中国人民银行外汇牌价显示：2019年1月18日，元人民币；2019年2月14日，元人民币，这一变化表明（）。
高考数学考前30天---选择题专训(三)
2019年高考数学考前30天---选择题专训（三）选择题：本大题共12小题，每小题5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．已知集合，，则（ ） A ． B ．C ．D ．【答案】B2．已知复数，，的虚部为（ ） A ． B ． C ．D ．【答案】C3．函数的图象为，命题图象关于直线对称；命题由的图象向右平移个单位长度可以得到图象；则下列命题为真命题的是（ ） A ． B ．C ．D ．【答案】B4．在内随机地取一个数，则事件“直线与圆有公共点”发生的概率为（ ） A ．B ．C ．D 【答案】A5．如图，网格纸上小正方形的边长为1，粗线画出的是某三棱锥的三视图，则此几何体的体积为（ ） A ．B ．C ．D ．{}270A x x =∈-<N {}2340B x x x =--≤A B ={}1,2,3{}0,1,2,372x x ⎧⎫⎨⎬⎩⎭≤702x x ⎧⎫<⎨⎬⎩⎭≤132i z =+22i z =-12z z ⋅1-i -1i π()3sin(2)3f x x =-C :p C 11π12x =:q x y 2sin 3=π3C q p ∧()p q ∧⌝()p q ⌝∨()p q ⌝∨(3,3-k y kx k =+()2211x y -+=1314123422343【答案】D6．设点是平面区域内的任意一点，则的最小值为（ ）A ．B ．C ．D ．【答案】B7．执行如图所示的程序框图，输出，则（ ） A ．9B ．10C ．11D ．12【答案】B8．函数的图象大致是（ ）(,)P x y 010220x x y x y ⎧⎪++⎨⎪++⎩≤≤≥224x y x +-121925S ()2log 1S +=()sin ln sin x x f x x x -⎛⎫= ⎪+⎝⎭【答案】A9．已知，若，，（ ） A ．B ．C ．D ．【答案】C10．正三棱柱的顶点都在同一个球面上，若球的半径为4，则该三棱柱的侧面面积的最大值为（ ） A ．B ．C ．D ．【答案】A11．设双曲线的右焦点为，过点作与轴垂直的直线交两条渐近线于，点，且与双曲线在第一象限的交点为，设为坐标原点，若，，该双曲线的离心率为（ ） A ． B ． C ． D ．【答案】C1>>b a 10log log 3a b b a +=3b a a b ==b 23232733172831576722221(0,0)x y a b a b-=>>F F x l A B P O (,)OP OA OB λμλμ=+∈R 320λμ=233355153315512．已知函数，若的解集中有且只有一个正整数，则实数的取值范围为（ ）A ．B ．C ．D ．【答案】A1()()e 22x f kx x x =+-()0f x <k 22121,e 4e 2⎡⎫--⎪⎢⎣⎭22121,e 4e 2⎛⎤-- ⎥⎝⎦322121,e 6e 4⎡⎫--⎪⎢⎣⎭32121,e 6e 2⎡⎫--⎪⎢⎣⎭。
高考真题复习题
高考真题复习题
一、选择题
1. 根据题目所给的选项，选择最符合题意的一项。
A. 选项一
B. 选项二
C. 选项三
D. 选项四
答案：C
2. 阅读下列句子，选出正确的答案。
A. 句子一
B. 句子二
C. 句子三
D. 句子四
答案：B
二、填空题
3. 根据题目所给的语境，填写合适的词语。
例句：春天到了，万物复苏，大地一片________。
答案：生机勃勃
4. 完成下列句子，使其语义完整。
例句：________，我们决定去郊外野餐。
答案：天气晴朗
三、简答题
5. 请简述《红楼梦》中林黛玉的性格特点。
答案：林黛玉性格多愁善感，聪明伶俐，才情出众，但同时也有些
许孤傲和脆弱。
6. 请列举至少三个中国历史上著名的改革事件。
答案：商鞅变法、王安石变法、戊戌变法。
四、阅读理解题
7. 阅读以下短文，回答问题。
短文内容：
（此处应插入一篇短文，由于篇幅限制，不具体展开）
问题：
(1) 文中提到的主要人物是谁？
答案：（根据短文内容回答）
(2) 文中描述的主要事件是什么？
答案：（根据短文内容回答）
五、作文题
8. 请以“我的梦想”为题，写一篇不少于800字的作文。
答案：（考生需根据个人情况撰写）
结束语：通过以上题目的复习，希望能够帮助同学们更好地准备高考，掌握解题技巧，提高答题效率。
预祝大家高考取得优异成绩！。
【考前30天】高考数学考前30天三轮专题提分必练绝密十六(大纲文科专用)
2012年高考考前30天三轮专题提分必练绝密之专题(十六)[第16讲 空间直线、平面的位置关系及简单几何体](时间：10分钟＋35分钟)2012二轮精品提分必练1．给定空间中的直线l 及平面α，则“直线l 与平面α内无数条直线都垂直”是“直线l 与平面α垂直”的( )A ．充要条件B ．充分不必要条件C ．必要不充分条件D ．既不充分又不必要条件2．已知三个互不重合的平面α、β、γ，且α∩β＝a ，α∩γ＝b ，β∩γ＝c ，给出下列命题：①若a⊥b，a⊥c，则b⊥c；②若a∩b＝P ，则a∩c＝P ；③若a⊥b，a⊥c，则a⊥γ；④若a∥b，则a∥c.其中正确命题个数为( )A ．1个B ．2个C ．3个D ．4个3．如图16－1，在正方体ABCD －A 1B 1C 1D 1中，M ，N 分别是BC 1，CD 1的中点，则下列判断错误．．的是( ) 2012二轮精品提分必练A ．MN 与CC 1垂直B ．MN 与AC 垂直C ．MN 与BD 平行 D ．MN 与A 1B 1平行4．已知集合A ＝{}直线，B ＝{}平面，C ＝A∪B，若a∈A，b∈B，c∈C，则下列命题中正确的是( )A .⎩⎪⎨⎪⎧ a⊥b c⊥b ⇒a∥cB .⎩⎪⎨⎪⎧a∥b c∥b ⇒a∥c C .⎩⎪⎨⎪⎧ a⊥b c∥b ⇒a⊥c D .⎩⎪⎨⎪⎧ a∥b c⊥b ⇒a⊥c 2012二轮精品提分必练1．如图16－2，设点P 是球O 的直径AB 上的动点，PA ＝x ，过点P 且与AB 垂直的截面面积为f(x)，则y ＝－12f(x)的大致图象是( ) 2012二轮精品提分必练图16－22012二轮精品提分必练2．一个球的内接正四棱柱的侧面积与上下两底面积的和之比为4∶1，且正四棱柱的体积是42，则这个球的体积是( )A .3πB ．23πC ．33πD ．43π3．点P 在正方体ABCD －A 1B 1C 1D 1的面对角线BC 1上运动，则下列三个命题正确的个数是( )①三棱锥A －D 1PC 的体积不变；②A 1P∥平面ACD 1；③DP⊥BC 1.A . 0B . 1C . 2D . 34．已知球O 是棱长为1的正方体ABCD －A 1B 1C 1D 1的内切球，则平面ACD 1截球O 所得的截面面积为( )A.π36B.66πC.π9D.π65．给定下列四个命题：(1)空间四边形的两条对角线是异面直线；(2)空间四边形ABCD中没有对角线；(3)和两条异面直线都相交的两条直线必异面；(4)过直线外一点作该直线的垂线，有且只有一条；(5)两条直线互相垂直，则一定共面；(6)垂直于同一直线的两条直线相互平行．其中正确的是______．6．已知三棱锥O－ABC，∠BOC＝90°，OA⊥平面BOC，其中OA＝1，OB＝2，OC＝3，O，A，B，C四点均在球S的表面上，则球S的表面积为________．7.如图16－4，在正三棱柱ABC－A1B1C1中，点D是BC的中点，BC＝BB1.(1)求证：A1C∥平面AB1D；(2)试在棱CC1上找一点M，使MB⊥AB1.2012二轮精品提分必练8．如图16－5，正方形ADEF 与梯形ABCD 所在的平面互相垂直， AD⊥CD，AB∥CD，CD ＝2AB ＝2AD.(1)求证：BC⊥BE；(2)在EC 上找一点M ，使得BM∥平面ADEF ，请确定M 点的位置，并给出证明．2012二轮精品提分必练图16－52012年高考考前30天三轮专题提分必练绝密之专题(十六)【基础演练】1．C 【解析】 直线l 虽与平面α内无数条直线都垂直，但若这些直线都相互平行，得不出直线与平面垂直．2．C 【解析】 三个平面两两相交有三条交线，这三条直线交于一点或者互相平行，只有命题①不正确．3．D 【解析】 MN 与A 1B 1异面，故D 答案是错误的．4．C 【解析】 对于A 选项，若c 表示平面，则有可能a ⊂c ；对于B 选项，若c 表示平面，则有可能a ⊂c ；对于D 选项，若c 表示平面，则有可能a∥c.【提升训练】1．B 【解析】 设球的半径为R ，则f(x)＝π[]R 2－－2＝－πx 2＋2πRx ，即y ＝－12f(x)＝12πx 2－πRx ，它是过坐标原点且开口向上的抛物线. 2．D 【解析】 设球的半径为R ，正四棱柱的底面边长为x ，侧棱长为y ，则4xy 2x 2＝4，∴y＝2x.又 正四棱柱的体积V ＝x 2y ＝2x 3＝42，∴x＝ 2.由正四棱柱内接于球，得2R ＝2x 2＋y 2＝23，∴R＝ 3.于是，V ＝43πR 3＝43π·(3)3＝43π. 3．C 【解析】 如图，三棱锥A －D 1PC 的底面APD 1的面积不变，高不变，故命题①正确；平面A 1BC 1平行平面ACD 1，命题②正确，命题③不正确．2012二轮精品提分必练4．D 【解析】 球心与正方体的中心重合，容易求得球心到平面ACD 1的距离为36，平面ACD 1截球得圆，即球心到截面圆圆心的距离为36，而球的半径为12，由勾股定理得截面圆的半径r ＝⎝ ⎛⎭⎪⎫122－⎝ ⎛⎭⎪⎫362＝66，故截面圆的面积为πr 2＝π·⎝ ⎛⎭⎪⎫662＝π6. 5．(1) 【解析】 空间四边形ABCD 中有对角线，故(2)错误；和两条异面直线都相交的两条直线可能共面，所以(3)错；过直线外一点作该直线的垂线，有无数条，所以(4)错；两条直线互相垂直，可能异面，所以(5)错误；垂直于同一直线的两条直线也可能异面，所以(6)错．6．14π 【解析】 分析知OA 、OB 、OC 两两垂直，构造以OA 、OB 、OC 分别为长、宽、高的长方体，则长方体与三棱锥有相同的外接圆，且外接圆的直径即为长方体的体对角线，所以球的半径R ＝1212＋22＋32＝142，故球的表面积为S ＝4πR 2＝4π×⎝ ⎛⎭⎪⎫1422＝14π. 7.2012二轮精品提分必练【解答】 (1)连接A 1B ，交AB 1于点O, 连接OD.∵O、D 分别是A 1B 、BC 的中点，∴A 1C∥OD.∵A 1C ⊄平面AB 1D ，OD ⊂平面AB 1D ，∴A 1C∥平面AB 1D.(2)M 为CC 1的中点. 证明如下：∵在正三棱柱ABC －A 1B 1C 1中，BC ＝BB 1，∴四边形BCC 1B 1是正方形．∵M 为CC 1的中点，D 是BC 的中点，∴△B 1BD≌△BCM，∴∠BB 1D ＝∠CBM，∠BDB 1＝∠CMB.又∵∠BB 1D ＋∠BDB 1＝π2， ∠CBM＋∠BDB 1＝π2，∴BM⊥B 1D. ∵△ABC 是正三角形，D 是BC 的中点，∴AD⊥BC.∵平面ABC⊥平面BB 1C 1C, 平面ABC∩平面BB 1C 1C ＝BC ，AD ⊂平面ABC ， ∴AD⊥平面BB 1C 1C.∵BM ⊂平面BB 1C 1C ，∴AD⊥BM.∵AD∩B 1D ＝D ，∴BM⊥平面AB 1D.∵AB 1⊂平面AB 1D ，∴MB⊥AB 1.8．【解答】(1)因为正方形ADEF 与梯形ABCD 所在的平面互相垂直，DE⊥AD， 所以DE⊥平面ABCD ，所以DE⊥BC，因为AB ＝AD ，所以∠ADB＝∠BDC＝π4， BD ＝AD 2＋AB 2＝2AD ，取CD 中点N ，连接BN ，则由题意知四边形ABND 为正方形，所以BC ＝BN 2＋CN 2＝AD 2＋14CD 2＝AD 2＋AD 2＝2AD ，所以BD ＝BC ， 所以△BDC 为等腰直角三角形，即BD⊥BC，又DE∩BD＝D ，所以BC⊥平面BDE ，所以BC⊥BE.2012二轮精品提分必练(2)取EC 中点M ，则有BM∥平面ADEF ，证明如下：连接MN ，由(1)知BN∥AD，所以 BN∥平面ADEF ，又因为M 、N 分别为CE 、CD 的中点，所以 MN∥DE，所以MN∥平面ADEF ，所以平面BMN∥平面ADEF ，所以BM∥平面ADEF.。
高考考前30天三轮专题提分必练绝密之七
专题限时训练(七)(限时：10分钟)()1. Everyone in this country enjoys the same right ________ religion，race or sex.A．regardless of B．in view ofC．in spite of D．in case of()2. Bill always seems so confident，but ________ he’s extremely shy.A．in vain B．in contrastC．in reality D．in surprise()3. ________ the fact that he is a star on stage now，this young man is still shy and talks little.A．By means of B．In spite ofC．In face of D．Apart from()4. The Plains Indians believe in the Great Spirit who has power ________ all things including animals，trees，stones and clouds.A．of B．atC．over D．in()5. The winter of 2008 was extremely bad.________ most of people say it was the worst winter of their lives.A．In general B．In a wordC．In all D．In fact()6.—The authors of computer viruses are geniuses.—I agree. If they applied their wisdom to other net technology ________ human beings can benefit，it would be better.A．in whichB．through whichC．from whichD．during which2012二轮精品提分必练()9. Too bad— I missed the early train ________only a few minutes!A．by B．inC．at D．after()10. Pleasant music is often played________ classes to make students refreshed and relaxed for a while.A．between B．amongC．over D．after()11. — Would you please tell me what time it is?—It’s five minutes to nine ________ my watch.A．on B．byC．at D．in()12. ________ the fact that he was not a trained economist，his achievements were remarkable.A．In spite of B．In case ofC．In view of D．In favor of()13. Heilongjiang Province is ________ north of Liaoning. Harbin，its capital city，lies ________ the Songhuajiang River.A．to; on B．in the; inC．/; on D．to the; in()14. To fully understand the writer，we must read not only between the lines，but sometimes ________ the lines.A．within B．beyondC．beside D．among()15. He got to the station early，________ missing his train.A．in the case of B．instead ofC．for fear of D．in search of()16. Although Tom agreed with her on most points，here was one ________ which he was unwilling to give in.A．on B．in C．to D．with ()17. For holidays，many people visit the Great Barrier Reef ________ the northeast coast of Australia，which has 700 islands.A．on B．inC．to D．off()18. As we all know，several primary schools and factories were named ________ the hero.A．from B．atC．after D．to()19. ________ the weather，the athletic meeting will be held on time.A．In contrast with B．In relation toC．On behalf of D．Regardless of()20. Mr. Johnson starts to work very early in the morning and goes on working until late in the afternoon ________ a break at midday.A．with B．forC．as D．through专题限时训练(七)1. A regardless of不管，不顾；in view of由于，鉴于；in spite of虽然，尽管；in case of 万一，如果，以防。
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
1 Indifference P1: P1 (1) the two pet neighbors greet each other politely and amicably ,whereas the two pets’ owners seem to ignore among.
P1 (2) pets, rather than/instead of people around them, are such an indispensable part in owners’ daily life to the point where they are excessively fond of their beloved animals while neglecting those who care them. P1 (3) indifference among people should be cleared up ,with the harmonious society echoed vigorously nowadays in China. P2: P2 (1) since we have to live on an on-the-move lifestyle , we are denied chances to share our feelings with our friends and relatives. P2 (2) with so many dishonesties going around in our life and then indifference occurring, we might have no choice but to enjoy the company of pets. P2 (3) too many tragedies - seeing someone in mortal danger without lifting a finger to save him- put on the stage in our daily life almost everyday. P2 (4) a crowd of people remained appallingly nonchalance词to 2
the plea of a mother, since she failed to offer the required amount of cash as a price to save her drowning son, the woman at last watched her son sink to death. P3: P3 (1) to narrow and bridge the gap among people.
P3 (2) the government should make law to establish the society in which people live in harmony. P3 (3) people should enhance the awareness of caring each other especially when they were young. P (4) can we make our society, where people ,even not knowing each other, help among them ,appeal to everyone
考前必看: Honesty Can the good honesty days be back to return somebody askes. Indeed, the question itself has aroused great concern and its implication should be given deeper consideration. The fact that dishonesty going around everywhere has made us have no choice but to need dwelling upon that proverb, which goes : Honesty is the best policy.
It must be pointed, nevertheless, that when it comes to the honesty , honesty of enterprise nowadays should still be taken more seriously. To begin with, if your company wants to win the trust and respect from consumers, you have to be honest. People are ready to love those who take honesty as their cardinal principle, whereas a liar company is not believed even no matter what he says well. In addition, if a company wants to make it especially during the fierce competition, the first qualification is honesty. No better illustration just mentioned before can be weighed than the case as listed below, 例证.Accordingly, no issue is as basic to a enterprise survival and prosperity as following the spirit of honesty.
Obviously, from what has been argued above, efforts should be taken to build up the 3
honesty-oriented society, or else we will be exposed to danger. For one thing, it is imperative for the government to make law to punish those who produce the the inferior and fake goods and prize those who turn out inexpensive but of fine quality commodities. For another, we should spare no effort to bring home to people the value of honesty. Only by undergoing these measures, can we say those good honesty days will be back.
建议信+倡导信(时事类) 某报社向广大读者就如何开展普及奥运英语口语培训的建议,你作为一读者就相关问题展开讨论. To Whom It May Concern, You have asked me for my advice with regard to how to launch the popularization of oral English training for the Olympic Games in 2008. On receiving your consultation, I have been pondering and now come up with some conductive suggestions as follows. To begin with, we should cast light upon the fact that everything concerning Olympic Games has played a key role in this training. That is to say , every detail of content taught in this training should manifest its application especially for Olympic Games from reception to send-off ceremony. In addition, this training should take into account various cultures and traditions and in turn be achieved through teaching progress. And above all, we should spare no effort to bring home to trainees , through this training ,the value of making Beijing an international city in the proper sense of this word. I would be ready to discuss with this matter o further details. Truly yours Li Ming