2014--2018全国卷七选五真题
【题文】根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 Tips for Cooking on a Tight Schedule From my experience , there are three main reasons why people don’t cook more often :ability , money , and time 36 .Money is a topic I’ll save for another day .So today I want to give you some wisdom about how to make the most of the time you spen t in the kitchen .Here are three tips for great cooking on a tight schedule : 1.Think ahead .The moments when I think cooking is a pain are when I’m already hungry and there’s nothing ready to eat .So think ahead of the coming week .When will you have time to cook ?Do you have the right materials already ? 37 . 2.Make your time worth it .When you do find time to cook a meal , make the most of it and save yourself time later on .Are you making one loaf of bread ? 38 .It takes around the same amount of time to make more of something .So save yourself the effort for future meal . 3.39 This may surprise you , but one of the best tools for making cooking worth your time is experimentation .It gives you the chance to hit upon new ideas and recipes that can work well with your appetite and schedule. The more you learn and the more you try, the more ability you have to take control of your food and your schedule. Hopefully that gives you a good start. 40_______ And don’t let a busy schedule discourage you from making some great changes in the way you eat and live! A. Try new things. B. Ability is easily improved. C. Make three or four instead. D. Understand your food better. E. Cooking is a burden for many people. F. Let cooking and living simply be a joy rather than a burden. G. A little time planning ahead can save a lot of work later on. BGCAF
选修4-5不等式高考题汇编
选修4-5不等式选讲高考题汇编 1. (2008广东理) 已知R a ∈,若关于x 的方程04 12=+-++a a x x 有实根, 则a 的取值范围是_______. 2、(2008海南、宁夏理)已知函数|4||8|)(---=x x x f 。(1)作出函数)(x f y =的 图像;(2)解不等式2|4||8|>---x x 。 3、(2008江苏)设a ,b ,c 为正实数,求证:3 3 3 11123a b c + + +abc ≥. 4、(2010辽宁理数)(24)(本小题满分10分)选修4-5:不等式选讲 已知c b a ,,均为正数,证明:3 6)111( 2 2 2 2≥+ + +++c b a c b a ,并确定c b a ,,为何 值时,等号成立。 5、(10年福建)选修4-5:不等式选讲已知函数()||f x x a =-。 (Ⅰ)若不等式()3f x ≤的解集为{}|15x x -≤≤,求实数a 的值; (Ⅱ)在(Ⅰ)的条件下,若()(5)f x f x m ++≥对一切实数x 恒成立,求实数m 的取值 范围。 选修4-5不等式选讲高考题汇编 1、(2008广东理) 已知R a ∈,若关于x 的方程04 12=+-++a a x x 有实根, 则a 的取值范围是_______. 2、(2008海南、宁夏理)已知函数|4||8|)(---=x x x f 。(1)作出函数)(x f y =的 图像;(2)解不等式2|4||8|>---x x 。 3、(2008江苏)设a ,b ,c 为正实数,求证:3 3 3 11123a b c + + +abc ≥. 4、(2010辽宁理数)(24)(本小题满分10分)选修4-5:不等式选讲 已知c b a ,,均为正数,证明:3 6)111( 2 2 2 2≥+ + +++c b a c b a ,并确定c b a ,,为何 值时,等号成立。 5、(10年福建)选修4-5:不等式选讲已知函数()||f x x a =-。 (Ⅰ)若不等式()3f x ≤的解集为{}|15x x -≤≤,求实数a 的值; (Ⅱ)在(Ⅰ)的条件下,若()(5)f x f x m ++≥对一切实数x 恒成立,求实数m 的取值 范围。
不等式选讲习题(含答案)
不等式选讲习题 1.(2014全国新课标I 卷)若0,0,a b >>且 11a b += (I )求33a b +的最小值; (II )是否存在,,a b 使得236?a b +=并说明理由. 2.(2014全国新课标II 卷)设函数1()(0).f x x x a a a =++-> (I )证明:()2;f x ≥ (II )若(3)5,f <求a 的取值范围. 3.(2013全国新课标I 卷)已知函数()212,() 3.f x x x a g x x =-++=+ (I )当2a =-时,求不等式()()f x g x <的解集; (II )设1,a >-且当1,22a x ??∈-??? ?时,()()f x g x ≤,求a 的取值范围. 4.(2013全国新课标II 卷)设,,a b c 均为正数,且1,a b c ++=证明: (I )1;3 ab bc ac ++≤ (II )222 1.a b c b c a ++≥. 5.(2012全国新课标卷)已知函数() 2.f x x a x =++- (I )当3a =-时,求不等式()3f x ≥的解集; (II )若()4f x x ≤-的解集包含[]1,2,求a 的取值范围. 6.(2011全国新课标卷)设函数 ()3f x x a x =-+,其中0a >. (I )当1a =时,求不等式()32f x x ≥+的解集; (II )若不等式()0f x ≤的解集为{|1},x x ≤-,求a 的值. 7.(2015第一次省统测)已知a 是常数,对任意实数x ,不等式|2||1||2||1|x x a x x -++≤≤--+都成立. (I )求a 的值; (II )设,0>>n m 求证:.22122 2a n n mn m m +≥+-+
(完整版)2011-2017全国卷七选五高考真题+答案
2011 Money Matters Parents should help their children understand money. 71 so you may start talking about money when your child shows an interest in buying things, candy or toys, for example. 1. The basic function of money Being explaining the basic function of money by showing how people trade money for goods or services. It is important to show your child how money is traded for the thing he wants to have. If he wants to have a toy, give him the money and let him hand the money to the cashier (收银员). 72 When your child grows a bit older and understands the basic function of money, you can start explaining more complex ways of using money. 2. Money lessons Approach money lessons with openness and honesty. 73 If you must say no to a child’s request to spend money, explain, ”You have enough toy trucks for now.”Or, if the request is for many different things, say. “You have to make a choice between this toy and that toy.” 3. 74 Begin at the grocery store. Pick put similar brands of a product—a name brand butter and a generic(无商标产品),for example. You can show your child how to make choices between different brands of a product so that you can save money. 75 If he chooses the cheaper brand, allow him to make another purchase with the money saved. Later, you may explains how the more expensive choice leaves less money for other purchases. A. Wise decision. B. The value of money. C. Permit the child why he can—or cannot—have certain things. D. Talk yourself what things that cost money are most important to you. E. Ask yourself what things that cost money are most important to you. F. Talk about how the money bought the thing after you leave the toy store. G. The best time to teach a child anything about money is when he shows an interest.
2019高考英语七选五-真题分析及练习含答案解析
专题二阅读七选五 1.高考阅读七选五的体裁与主题语境(以2016~2018全国卷为例) 体裁主题语境段落小标题 2018卷Ⅰ说明文人与社会——家庭装饰无卷Ⅱ议论文人与自我——晨练的好处无卷Ⅲ说明文人与社会——舞蹈无 2017卷Ⅰ记叙文人与自我——野营无卷Ⅱ说明文人与社会——避免工作时被打扰无卷Ⅲ说明文人与社会——如何建立生物钟有 2016卷Ⅰ说明文人与社会——密码学无卷Ⅱ说明文人与自然——花园有卷Ⅲ说明文人与社会——购买和烹制鱼无 阅读七选五的体裁主要以指导性说明文为主,间或考查记叙文,虽然近几年没有考查议论文,但对这种文体也不应该忽视,主题语境以人与社会为主,以人与自然和人与自我为辅。文章越来越趋向于不带标题和段落小标题,但文章大都结构清晰,基本都是总分结构。 2.高考阅读七选五的设题特点 阅读七选五是从一篇短文后的七个选项中选出五个能填入文章空处的最佳选项。选项主要有以下三种情况:一是主旨概括句,二是过渡性句子,三是注释性句子。 3.高考阅读七选五的考查重点 此题型主要考查考生对文章的整体内容和结构以及上下文逻辑意义的理解和掌握。它拓宽了阅读理解能力考查的深度和广度,不仅考查考生句子层面的阅读理解能力,更从语篇层次上考查考生的语篇连贯能力,即考生的语感和语境领悟能力,把握作者思路的能力,以及对整个语篇或语段的衔接手段与连贯性的洞察力。 4.高考阅读七选五的备考启示
备考时要注意拓展题材和体裁;注意加强对不同文本的语篇知识的学习;注意叙述类文本、议论类文本的阅读。重视指导类说明文的同时,不放弃对介绍事物类说明文,记叙文和议论文的练习。 段首题 1.空格为主旨句 在某段第一句设空的内容通常是该段落主旨句,学生需要通过认真研读该段的内容,然后从选项中查找下文的同义词或其他相关词或句的方法,从而确定答案;有时则需反复读设空处后面一两句或更多内容,确定关键信息词,然后在各个选项中查找关联词和信息句。 【典例示范】(2017·全国卷Ⅰ)__40__ It must be true that sooner or later,everyone finds his or her way back to recommend that you find your way in style. must say that I have certainly come to enjoy camping.
不等式选讲-近三年高考真题汇编详细答案版
分类汇编:不等式选讲 2014年真题: 1.[2014·卷] 不等式|x -1|+|x +2|≥5的解集为________. 1.(-∞,-3]∪[2,+∞) 2.[2014·卷] 若关于x 的不等式|ax -2|<3的解集为? ????? x -53<x <13,则a =________. 2.-3 3.[2014·卷] A .(不等式选做题)设a ,b ,m ,n ∈R ,且a 2+b 2=5,ma +nb =5,则m 2+n 2 的最小值为________. 3.A. 5 4.[2014·卷] 若不等式|2x -1|+|x +2|≥a 2 +12 a +2对任意实数x 恒成立,则实数a 的取值围是________. 4.? ?????-1,12 5.[2014·卷] (1)(不等式选做题)对任意x ,y ∈R ,|x -1|+|x |+|y -1|+|y +1|的最小值为( ) A .1 B .2 C .3 D .4 5.(1)C 6.[2014·卷] (Ⅲ)选修4-5:不等式选讲 已知定义在R 上的函数f (x )=|x +1|+|x -2|的最小值为a . (1)求a 的值; (2)若p ,q ,r 是正实数,且满足p +q +r =a ,求证:p 2+q 2+r 2 ≥3. 6. (Ⅲ)解:(1)因为|x +1|+|x -2|≥|(x +1)-(x -2)|=3, 当且仅当-1≤x ≤2时,等号成立, 所以f (x )的最小值等于3,即a =3. (2)由(1)知p +q +r =3,又p ,q ,r 是正实数, 所以(p 2+q 2+r 2)(12+12+12)≥(p ×1+q ×1+r ×1)2=(p +q +r )2 =9, 即p 2+q 2+r 2 ≥3. 7.[2014·卷] 选修4-5:不等式选讲 设函数f (x )=2|x -1|+x -1,g (x )=16x 2 -8x +1.记f (x )≤1的解集为M ,g (x )≤4的解集为N . (1)求M ; (2)当x ∈M ∩N 时,证明:x 2f (x )+x [f (x )]2 ≤14 . 7.解:(1)f (x )=? ????3x -3,x ∈[1,+∞), 1-x ,x ∈(-∞,1). 当x ≥1时,由f (x )=3x -3≤1得x ≤43,故1≤x ≤4 3 ; 当x <1时,由f (x )=1-x ≤1得x ≥0,故0≤x <1. 所以f (x )≤1的解集M =? ????? x 0≤x ≤43. (2)由g (x )=16x 2 -8x +1≤4得16? ?? ??x -142≤4,解得-14≤x ≤34, 因此N =? ????? x -14≤x ≤34,
-2019全国卷i、ii、iii英语高考真题七选五
1. 2018新课标全国 (I) 根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 Color is fundamental in home design——something you’ll always have in every room. A grasp of how to manage color in your spaces is one of the first steps to creating rooms you’ll love to live in. Do you want a room that’s full of life Professional Or are you just looking for a place to relax after a long day 36 , color is the key to making a room feel the way you want it to feel. Over the years, there have been a number of different techniques to help designers approach this important point. 37 , they can get a little complex .But good news is that there’re really only three kinds of decisions you need to make about color in your home: the small ones, the medium ones, and the large ones. 38 . They’re the little spots of color like throw pillows ,mirrors and baskets that most of us use to add visual interest to our rooms .Less tiring than painting your walls and less expensive than buying a colorful sofa ,small color choices bring with them the significant benefit of being easily changeable . Medium color choices are generally furniture pieces such as sofas, dinner tables or bookshelves 39 . They require a bigger commitment than smaller ones, and they have a more powerful effect on the feeling of a space. The large color decisions in your rooms concern the walls, ceilings, and floors .Whether you’re looking at wallpaper or paint, the time, effort and relative expense put into it are significant. 40 . A. While all of them are useful B. Whatever you’re looking for C. If you’re experimenting with a color
不等式选讲知识点归纳及近年高考真题
不等式选讲知识点归纳及近年高考真题 考点一:含绝对值不等式的解法 例1.(2011年高考辽宁卷理科24)已知函数f (x )=|x-2|-|x-5|. (I )证明:-3≤f (x )≤3;(II )求不等式f (x )≥x 2-8x+15的解集. 解:(I )3, 2,()|2||5|27,25,3, 5.x f x x x x x x -≤?? =---=-<?≥? 当25,327 3.x x <<-<-<时 所以3() 3.f x -≤≤ (II )由(I )可知,当2 2,()815x f x x x ≤≥-+时的解集为空集; 当2 25,()815{|55}x f x x x x x <<≥-+-≤<时的解集为; 当2 5,()815{|56}x f x x x x x ≥≥-+≤≤时的解集为. 综上,不等式2 ()815{|56}.f x x x x x ≥-+-≤≤的解集为 变式练习:1. (2011年高考山东卷理科4)不等式|5||3|10x x -++≥的解集为 (A )[-5.7] (B )[-4,6] (C )(,5][7,)-∞-?+∞ (D )(,4][6,)-∞-?+∞ 【答案】D 2.若存在实数x 使|||1|3x a x -+-≤成立,则实数a 的取值范围是 . 【答案】42≤≤-a 【解析】|||1|3x a x -+-≤表示在数轴上,a 到1的距离小于等于3,即31≤-a , 则42≤≤-a 1.已知集合{} 1|349,|4,(0,)A x R x x B x R x t t t ??=∈++-≤=∈=+∈+∞??? ? ,则集合A B ?=________. 【答案】{}52|≤≤-∈x R x 3. (2011年高考广东卷理科9)不等式130x x +--≥的解集是______. 【解析】}1|{≥x x 。由题得1) 3()1(|3||1|2 2 ≥∴-≥+∴-≥+x x x x x 所以不等式的解集为}1|{≥x x 。 4.若关于x 的不等式12a x x ≥++-存在实数解,则实数a 的取值范围是 【答案】(,3][3,)-∞-+∞ 【解析】:因为12|12|3x x x x ++-≥+-+=所以12a x x ≥++-存在实数解,有3a ≥3a ≤-或3a ≥ 5.(2011年高考江苏卷21)解不等式:|21|3x x +-< 原不等式等价于:43213,23 x x x x -<-<-∴-<< ,解集为4 (2,)3- 6. (2011年高考全国新课标卷理科24)设函数0,3)(>+-=a x a x x f (1)当1=a 时,求不等式23)(+≥x x f 的解集;(2)如果不等式0)(≤x f 的解集为{} 1-≤x x ,求a 的值。
高考英语全国卷七选五-历年真题-doc
高考英语阅读专题练习七选五 Muzak The next time you go into a bank, a store, or a supermarket, stop and listen. What do you hear? 71 It's similar to the music you listen to, but it's not exactly the same. That's because this music was especially designed to relax you, or to give you extra energy. Sometimes you don't even realize the music is playing, but you react to the music anyway. Quiet background music used to be called "elevator (电梯) music" because we often heard it in elevators. But lately we hear it in more and more places, and it has a new name "Muzak". About one-third of the people in America listen to "Muzak" everyday. The music plays for 15 minutes at a time, with short pauses in between. It is always more lively between ten and eleven in the morning, and between three and four in the afternoon, when people are more tired. 72 If you listen to Muzak carefully, you will probably recognize the names of many of the songs. Some musicians or songwriters don't want their songs to be used as Muzak, but others are happy when their songs are chosen. Why? 73 Music is often played in public places because it is designed to make people feel less lonely when they are in an airport or a hotel. It has been proven that Muzak doeswhat it is designed to do. Tired office workers suddenly have more energy when they hear the pleasant sound of Muzak in the background. 74 Supermarket shoppers buy 38 percent more groceries. 75 . They say it's boring to hear the same songs all the time. But other people enjoy hearing Muzak in public places. They say it helps them relax and feel calm. One way or another, Muzak affects everyone. Some farmers even say their cows give more milk when they hear Muzak! A. Some people don't like Muzak. B. The music gives them extra energy. C. Music is playing in the background. D. Factory workers produce 13 percent more. E. Muzak tends to help people understand music better. F. They get as much as $4 million a year if their songs are used. G. Muzak is played in most of the big supermarkets in the world. Public speaking and critical thinking What is critical thinking? To a certain degree, it’s a matter of logic(逻辑)—of being able to spot weaknesses in other people’s argument and to avoid them in your own, it also includes related skills such as distinguishing fact from opinion and assessing the soundness of evidence. In the broad sense, critical thinking is focused, organized thinking—the ability to see clearly their relationships among ideas. 71 The greatest thinkers, scientists and inventors have often taken their information that was readily available and put it together differently to produce new ideas that, too, is critical thinking. 72 As the class goes on, for example, you will probably spend a good deal of time organizing your speeches. While this may seem like a purely mechanical(机械的) exercise, it is closely connected with critical thinking. If the structure of your speech is loose and confused, chances are that your thinking is also disordered and confused. If, on the other hand, the structure is clear, there is a good chance your thinking is too. Organizing a speech is not a matter ofarranging the ideas you already have. 73 What is true of organization is true of many aspects of public speaking. 74 As you work on expressing your ideas in clear, accurate language, you will improve your ability to think clearly and accurately. 75 As you learn to listen critically to speeches in class. You will be better able to assess the ideas of speakers in a variety of situations. If you take full advantage of your speech class, you will be able to develop your skills as critical thinker in many circumstances. This is one reason public speaking has been regarded as a vital part of education since the days of ancient Greece. A. Rather, it is an important part of shaping the ideas themselves. B. This may seem like a lot of time, but the rewards are well worth it. C. It may also help you to know that there is no such thing as a perfect speech. D. It has often been said that there are few new ideas in the world, only reorganized ideas. E. If you are wondering what this has to do with your public speaking class, the answer is quite a lot. F. The skills you learn in your speech class can help you become a more effective thinker in a number of ways. G. As you study the role of evidence and reasoning in speechmaking ,you will see how they can be used in other forms of communication as well. Empathy Last year, researchers from the University of Michigan reported that empathy, the ability to understand other people, among college students had dropped sharply over the past 10 years. __71__ Today, people spend more time alone and are less likely to join groups and clubs. Jennifer Freed, a co-director of a teen program, has another explanation. Turn on the TV, and you’re showered with news and reality shows full of people fighting, competing, and generally treating one another with no respect. __72__ There are good reasons not to follow those bad examples. Humans are socially related by nature. __73__ Researchers have also found that empathetic teenagers are more likely to have high self-respect. Besides, empathy can be a cure for loneliness, sadness, anxiety, and fear. Empathy is also an indication of a good leader. In fact, Freed says, many top companies report that empathy is one of the most important things they look for in new managers. __74__ “Academics are important. But if you don’t have emotional (情感的) intelligence, you won’t be as successful in work or in your love life,” she says. What’s the best way to up your EQ (情商)? For starters, let down your guard and really listen to others. __75__ To really develop empathy, you’d better volunteer at a nursing home or a hospital, join a club or a team that has a diverse membership, have a “sharing circle” with your family, or spend time caring for pets at an animal shelter. A.Everyone is different, and levels of empathy differ from person to person. B.That could be because so many people have replaced face time with screen time, the researchers said.