太原市2017年高三模拟试题(二)
太原市2017年高三模拟试题(二) 太原市2017年高三模拟试题(二)
高一英语 第一学期 2 第二部分 阅读理解(共两节,60分) 第一节 (共15小题,每小题3分,满分45分) A
For: Boys & Girls aged 7-10 Dates: 3 Sundays Sunday, April 3, 2016 Sunday, April 24, 2016 Sunday, April 15, 2016 Time: 10:00 a.m.-3:15 p.m. Instructors: Jonathan Gonzalez, Stephanie Geisel, Paul Tobin, teen instructors and other visiting elders. Location: Stony Kill Road in Accord, NY Additional Questions and Information: Please contact Simon Abramson with questions about the contect of this program. Simon is reachable at (845)256-9830 or simon@wildearth.org. Spring Discovery This spring, we’ll gather in the forest to play games, tell stories around the fire and explore nature! Join us for any of the Kestrel Sundays! Together, we’ll safely explore nature and build lasting friendships with each other and stay in the village where the children have enriched their life each spring camp. Children walk away form Kestrel feeling at home in nature and at home in themselves. Each day begins with a morning circle where thanksgiving, songs and games bring us further into our bodies. The days are filled with nature-based games that expand our awareness, storytelling from skilled instructors and visiting elders, songs inspired by nature’s beauty, exploring the forest and looking for mysteries, sculpting clay, and wandering the caves. At the end of the day, with leaf and flower crowns on our heads, our faces painted and smiles on our faces, we’ll return. Kestrel is where your child will: Play and explore the beautiful outdoors. Experience and practice a variety of wilderness skill and native technology. Practice awareness, quiet mind, animal farms, curiosity, exploration, telling the story of the day and gratitude. Face personal and group challenges tailored to build awareness, self-confidence and group unity. Our Kestrel instructors are expert in guiding children to safety and helping them freely move in the direction of their own curiosity. 21. When can children join in Spring Discovery? A. During the night. B. Only on the three Sundays. C. In the season of spring. D. From 10:00 am to 3:15 pm every day. 22. What can we know from the passage? A. Spring Discovery will be held every the other year. B. The instructors are all experienced adult experts. C. Kestrel might be experienced in holding the camp. D. The entire family is welcome to the Kestrel Sundays. 23. What will the children do in the camp according to the passage? A. Visit the group leaders. B. Learn how to cooperate. C. Plant trees in the forest. D. Help elders to tell stories. B Some scientists will say it is impossible to read minds. They will also tell you that you can make educated guesses on what a person might be thinking or feeling. Perhaps there really is 太原市2017年高三模拟试题(二) 高一英语 第一学期 3 nothing mysterious about the power to read minds. Perhaps it is simply human sense based on observation and educated guesses after all, but that’s really a useful ability to learn. Learn body language. How a person moves and holds their hands, and even what their eyes are doing are actually telling about what is going on inside their head. For example, pupils(瞳孔) tend to grow larger when you are interested in or excited about something. If you are talking to someone and making eye contact, finding their pupils are large and round, chances are that they are not feigning interest in the conversation. Someone biting their nails is probably nervous. Someone who folds their arms across their chest when they are not cold is probably trying to put a barrier between you and themselves. Learn to mentally put yourself in another’s place. Scientists have recently discovered that your brain has neurons(神经元)that become active when you watch someone do something the same as we did the action ourselves. So when you are able to open yourself to understanding how other people are feeling, you can figure out reasons and predict future actions, reactions, even thoughts. Sometimes you can use Extra Sensory Perception(ESP)(超感觉力)to read someone’s mind. This does not mean you will literally be able to read their mind like a book. Instead, you will receive impressions or feelings, which are difficult to explain. To improve your ESP abilities, take up meditation(冥想). Because meditation helps enable you to purposely put your brain in a state of relaxed awareness, where you will be more successful in reading people and receiving impressions. Practice and combine all of these steps. You will soon find yourself able to read people’s mind. 24. What is the passage mainly about? A. The ways of reading people’s minds. B. The steps of learning body language. C. The necessity of learning body language. D. The relationship between mind and body language. 25. What does the underlined word “feigning”mean? A. Expressing. B. Pretending. C. Finding. D. Declaring 26. Why can you read someone’s mind when you mentally put yourself in his/her place? A. You suddenly have the ability to understand his or her feeling. B. Your imagination ability and your past experience are combined. C. Some neurons in your brain improve your observation ability. D. Your past similar experiences make some neuron in your brain active. 27. How does meditation help with mind reading? A. By making educated guesses on minds. B. By learning to make eye contact. C. By changing ESP abilities for the better. D. By strengthening impressions received. C “Stop all the rushing and screaming: too much excitement is bad for families. Kids are missing out on an essential life - relaxed down time,”says Dr. Charleotte Reznick.
【山西省太原第五中学年】2017届高三第二次模拟考试(5月)数学年(理)试题
答案
一、选择题 1~5.CDACB 二、填空题
6~10.BCDCA
11~12.CB
13. 13
14.120 15. 41π 16. 2 017 三、解答题 17.解:(1)在 △BEC 中,据正弦定理,有 BE CE .
sinBCE sin B
2.
5
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4分
1/6
a 16 2 3. 5 9 .
月度市场占有率 y 与月份序号 x 之间的线性回归方程为 y 2x 9 .
5分
当 x 7 时, y 2 7 9 =23 .
故 M 公司 2 017 年 4 月份的市场占有率预计为 2300 .
每辆 B 款车可产生的利润期望值为 2. 7 500 1 200 150 (元).
应该采购 A 款单车.
12 分
19.解:(Ⅰ)取线段 CD 的中点 Q ,连结 KQ ,直线 KQ 即为所求.
如图所示:
10 分
2/6
(Ⅱ)以点 A 为原点, AB 所在直线为 x 轴, AD 所在的直线为 y 轴,建立空间直角坐标系,如图,
B 2π , BE 1,CE 7, sinBCE BE sinB 2 21 .
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当 a 0 时,由 h(x) 0 得, x0 1 a , h(x) 在 ( 1 a , 1 a) 上单调递减,在 ( 1 a , ) 上单调递增.
17届山西省太原市高三第二次模拟考试英语试卷含解析
2017届山西省太原市高三第二次模拟考试英语试卷含解析太原市2017 年高三年级模拟试题第二部分阅读理解第一节阅读下列短文,从每小题所给出的四个选项中,选出最佳选项。
答案写在答题卡上。
注意:C 篇分A、 B 两种题型,A种题型为客观题,B种题型为主观题。
A For: Boys & Girls aged 7---10 Dates: 3 Sundays Sunday, April 3, 2016 Sunday, April 24, 2016 Sunday, May 15, 2016 Time: 10:—3:15 Cost: $80 per day, $225 for all 3 days Instructors: Jonathan Gonzalez, Stephanie Geisel, Pail Tobin, teen instructors And other visiting elders. Location: Stony Road in Kill Accord, Additional Questions Information:NY and Please contact Simon Abramson with questionsabout the content of this program. Simon is reachable at (845) 256- 9830 or simon@ Spring Discovery This spring, we’ll gather in the forest to play games, tell stories around the fire and explore nature! Join us for any of the Kestrel Sundays! Together, we’ll safely explore nature and build lasting friendships with each other and stay in the village where the children have enriched their life each spring camp. Children walk away from Kestrel feeling at home in nature and at home in themselves. Each day begins with a morning circle where thanksgiving, songs and games bring us further into our bodies. The days are filled with nature-based games that expand our awareness, storytelling from skilled instructors and visiting elders, songs inspired by nature’s beauty, exploring the forest and looking for mysteries, sculpting clay, and wandering the caves. At the end of the day,with leaf and flower crowns on our heads, our faces painted and smiles on our faces, we’ll return! Kestrel is where your child will: Play and explore the beautiful outdoors. Experience and practice a variety of wilderness skills and native technology. Practice awareness, quiet mind, animal farms, curiosity, exploration, telling the story of the day and gratitude. Face personal and group challenges tailored to build awareness, self-confidence and group unity. Our Kestrel instructors are expert in guiding children to safety and helping them freely move in the direction of their own curiosity. 21. When can children join in Spring Discovery? A. During the night.B. Only on the three Sunday-s,C. In the season of spring.D. From 10:00 am t0 3:15 pm every day 22. What can we know from the passage? A. Spring Discovery will be held every other year. B.The instructors are all experienced adult experts. C. Kestrel might be experienced in holding the camp. D. The entire family is welcome to the Kestrel Sundays 23. What will the children do in the camp according to the passage? A. Visit the group leaders. C. Plant trees in the forest. B. Learn how to cooperate. D. Help elders to tell stories. 21. 答案:B 细节理解题根据原文Dates: 3 Sundays 可知答案 B 22. 答案:C 推理判断题根据原文第三段第三行where the children have enriched their life each spring camp 可获知答案C 23. 答案:B 细节理解题根据原文倒数第二段to build awareness, self-confidence and group unity 可知答案 B B Some scientists will say it is impossible to read minds. They will also tell you that you can make educated guesses on what a person might be thinking or feeling. Perhaps there really is nothing mysteriousabout the power to read minds. Perhaps it is simply human sense based on observation and educated guesses after all, but that’s really a useful ability to learn. Learn body language. How a person moves and holds their hands, and even what their eyes are doing are actually telling about what is going on inside their head. For example, pupils (瞳孔) tend to grow larger when you are interested in or excited about something. If you are talking to someone and making eye contact, finding their pupils are large and round, chances are that they are not feigning interest in the conversation. Someone biting their nails is probably nervous. Someone who folds their arms across their chest when they are not cold is probably trying to put a barrier between you and themselves. Learn to mentally put yourself in another’ s place. Scientists have recently discovered thatyour brain has neurons (神经元) that become active when you watch someone do something the same as we did the action ourselves. So when you are able to open yourself to understanding how other people are feeling, you can figure out reasons and predict future actions, reactions, even thoughts. Sometimes you can use Extra Sensory Perception (ESP) (超感觉力) to read someone’s m ind. This does not mean you will literally be able to read their mind like a book. Instead, you will receive impressions or feelings, which are difficult to explain. To improve your ESP abilities, take up meditation (冥想). Because meditation helps enable you to purposely put your brain in a state of relaxed awareness, where you will be more successful in reading people and receiving impressions. Practice and combine all of these steps. You will soon find yourself able to readpeople’s minds. 24. What is the passage mainly about? A. The ways of reading people’s minds. B. The steps of learning body language. C. The necessity of learning to read people’s minds. D. The relationship between mind and body language. 25. What does the underline word \A. Pretending. C. Finding. D. Declaring. 26. Why can you read someone’s mind when you mentally put yourself in his/her place? A. You suddenly have the ability to understand his or her feeling. B. Your imagination ability and your past experience are combined. C. Some neurons m your brain improve your observation ability. D. Your past similar experiences make some neurons in your brain active. 27. How does meditation help with mind reading? A. By making educated guesses on minds. B. By learning to make eye contact. C. By changing ESPabilities for the better. D. By strengthening impressions received. 24. 答案:A 主旨大意题根据原文最后一段Practice and combine all of these steps. You will soon find yourself able to read people’s minds.可知答案25. 答案:B 词义猜测题根据原文第二段第三行tend to grow larger when you are interested in or excited about something 可知not feigning interest 表示感兴趣,即feigning 表示否定意义,故选B 26. 答案:D 细节理解题根据原文第三段第一行scientist have recently discovered that your brain has neurons that become active 可知答案D 27. 答案:C 细节理解题根据原文倒数第二段第一行to improve your ESP abilities, take up meditation 可知答案 C C \relaxed down time, \. Charlotte Reznick. \is taking the son to a soccer game, and the other parent is taking the daughter to her swim meet. Thenthere’s art class, basebal l practice, extra tutoring, and more! By the time the family meet up for dinner, everyone is exhausted.\ All the rushing makes for a short temper. \they lower their own self-esteem as well as losing the respect of their children,\says Dr. Carl Pickhardt \parents think it shows they’ re serious about what they’re saying, they are really just showing helpless desperation at not getting their way. \ These days what kids are learning at school and from the outside is a lot greater than it used to be even just a generation ago. \problem is that stress-relieving activities - reading, taking walks or hot baths, watching the sunset and other activities are not even part of most kids’ experience any more, \\are so many more social-interaction opportunities in our computer age, but not all of them promote meaningful connections, which is another potentialoutlet for stress, \One way to relieve stress is a simple technique called\balloon breath\It’s a great way for everyone to become calm so that they can respond thoughtfully rather than just react.参考答案:空前的关键词为“isn’t easy”,空后的关键词为”more successful”,故中间需要转折。
山西省三区八校2017届高三第二次模拟考试英语试卷(含答案)
山西省三区(古县/离石区/高县)八校2017届高考模拟考试英语试卷注意事项:1.本试卷分第I卷(选择题)和第II卷(非选择题)两部分。
2.答题前,考生务必将自己的姓名、准考证号填写在本试卷相应的位置。
3.全部答案在答题卡上完成,答在本试卷上无效。
4.第I卷听力部分满分30分,不计入总分,考试成绩录取时提供给高校作参考。
5.考试结束后,将本试题卷和答题卡一并交回。
第I 卷第一部分听力(共两节,满分30分)做题时,先将答案标在试卷上。
录音内容结束后,你将有2分钟的时间将试卷上的答案转涂到答题卡上。
第一节(共5小题;每小题1.5分,满分7.5分)听下面5段对话。
每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。
听完每段对话后,你都有10秒钟的时间来回答有关小题和阅读下一小题。
每段对话仅读一遍。
例:How much is the shirt?A. £19.15B. £9.15C. £9.18答案是B.1. Why did the woman get the book so late?A. The post office lost the book.B. It was on the way for 3 years.C. It was the man’s boss’ fault.2. How much does one ticket cost?A. $20.B. $22.5.C. $25.3. What is the man’s attitude towards the cafeteria?A. H e doesn’t mind eating there.B. He doesn’t like the food there.C. He likes the food, but it’s crowded.4. Why does the woman ask the man to copy the note?A. His handwriting is good.B. He can type quickly.C. He is good at computers.5. What do we learn from this conversation?A. The man won’t go to the concert.B. The woman will go home for dinner.C. The man and the woman will eat together.第二节(共15小题)听下面5段对话或独白。
山西省太原市2017-2018学年高三第二次模拟考试理数试题 Word版含答案
2017-2018学年 数学试卷(理工类)第Ⅰ卷一、选择题:本大题共12个小题,每小题5分,共60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2{log (1)2}A x x =-<,{6}B x a x =<<,且{2}A B x x b =<< ,则a b +=( )A .7B .6C .5D .42.如图,在复平面内,表示复数z 的点为A ,则复数12zi-的共轭复数是( ) A .i B .i - C .35i D .35i -3.下列函数中,在其定义域内既是奇函数又单调递增的函数是( ) A .1yx=-B .33x x y -=-C .y x x =D .3y x x =- 4.若某几何体的三视图如图所示,则此几何体的体积等于( ) A .30 B .24 C .12 D .45.若函数()f x 同时满足以下三个性质:①()f x 的最小正周期为π;②对任意的x R ∈,都有()()04f x f x π-+-=;③()f x 在(,)42ππ上是减函数,则()f x 的解析式可能是( )A .()sin 2f x x =B .()sin 2cos 2f x x x =+C .()sin()8f x x π=+D .3()cos(2)4f x x π=+6.执行如图所示的程序框图,若输出的结果为2,则输入的正整数a 的可能取值的集合是( ) A .{1,2,3,4,5} B .{1,2,3,4,5,6} C .{2,3,4,5} D .{2,3,4,5,6}7.设,x y 满足不等式组60210320x y x y x y +-≤⎧⎪--≤⎨⎪--≥⎩,若z ax y =+的最大值为24a +,最小值为1a +,则实数a 的取值范围是( )A .[2,1]-B .[1,2]-C .[3,2]--D .[3,1]-8.已知三棱锥S ABC -中,底面ABCSA 垂直于底面ABC ,1SA =,那么三棱锥S ABC -的外接球的表面积为( )A .2πB .4πC .6πD .5π9. 已知双曲线22221x y a b-=(0,0)a b >>与函数y =(0)x ≥的图象交于点P,若函数y =P 处的切线过双曲线左焦点(1,0)F -,则双曲线的离心率是( )ABCD .3210.已知正项数列{}n a 的前n 项和为n S ,若{}n a和都是等差数列,且公差相等,则100S =( )A .50B .100C .1500D .250011.已知圆22:1C x y +=,点00(,)P x y 是直线:3240l x y +-=上的动点,若在圆C 上总存在两个不同的点,A B ,使OA OB OP +=,则0x 的取值范围是( )A .24(0,)13 B .24(,0)13- C .13(0,)24 D .13(0,)1212.已知函数1()ln 22x f x =+,2()x g x e -=,若()()gm f n =成立,则n m -的最小值为( )A .1ln 2-B .ln 2 C.3 D .23e -第Ⅱ卷(非选择题 共90分)二、填空题(本大题共4小题,每小题5分,共20分.)13.已知6)a x的展开式中含32x 的项的系数为30,则实数a =____________.14.在区间[]0,1上随机抽取两个数,x y ,则事件“12xy ≥”发生的概率为_____________.15.在ABC ∆中,角,,A B C 的对边分别是,,a b c ,若2sin sin a bc B A+=,则C ∠的大小是__________.16.已知关于x的函数222sin()4()2cos tx x xf x x xπ++=+的最大值为a ,最小值为b ,若2a b +=,则实数t 的值为_________.三、解答题 :解答应写出文字说明、证明过程或演算步骤.17.(本小题满分12分)已知n S 是数列{}n a 的前n 项和,12a =,且14n n n S a a +=∙,数列{}n b 中,114b =,且1(1)n n nnb b n b +=+-,*n N ∈.(1)求数列{}n a 的通项公式; (2)设12332n n n b a c +=(*n N ∈),求{}n c 的前n 项和n T .18.(本小题满分12分)如图,在斜三棱柱111ABC A B C -中,1A B AC ⊥,且15A B AC ==,113AA BC ==,12AB =.(1)求证:平面11ABB A ⊥平面11ACC A ; (2)求二面角1A BB C --的正切值的大小.19.(本小题满分12分)近几年来,我国许多地区经常出现雾霾天气,某学校为了学生的健康,对课间操活动做了如下规定:课间操时间若有雾霾则停止组织集体活动,若无雾霾则组织集体活动,预报得知,这一地区在未来一周从周一到周五5天的课间操时间出现雾霾的概率是:前3天均为50%,后2天均为80%,且每一天出现雾霾与否是相互独立的. (1)求未来一周5天至少一天停止组织集体活动的概率;(2)求未来一周5天不需要停止组织集体活动的天数X 的分布列;(3)用η表示该校未来一周5天停止组织集体活动的天数,记“函数2()1f x x x η=--在区间(3,5)上有且只有一个零点”为事件A ,求事件A 发生的概率. 20.(本小题满分12分)已知椭圆22221(0)x y a b a b +=>>的离心率为2(1)已知点,A B 是椭圆上两点,点C 为椭圆的上顶点,ABC ∆的重心恰好是椭圆的右焦点F ,求,A B 所在直线的斜率;(2)过椭圆的右焦点F 作直线12,l l ,直线1l 与椭圆分别交于点,M N ,直线2l 与椭圆分别交于点,P Q ,且2222MP NQ NP MQ +=+ ,求四边形MPNQ 的面积S 最小时直线1l 的方程.21.(本小题满分12分)已知函数2()1xf x e ax bx =---(,a b R ∈,e 为自然对数的底数).(1)若对于任意[]0,1a ∈,总存在[1,2]x ∈,使得()0f x ≤成立,求b 的最小值; (2)若(1)0f =,函数()f x 在区间(0,1)内有零点,求a 的取值范围.请考生在22、23、24三题中任选一题作答,如果多做,则按所做的第一题记分,作答时请写清题号.22.(本小题满分10分)选修4-1:几何证明选讲如图,1O 与2O 相交于,A B 两点,AB 是2O 的直径,过A 点作1O 的切线交2O 于点E ,并与1BO 的延长线交于点P ,PB 分别与1O ,2O 交于,C D 两点.(1)求证:PA PD PE PC ∙=∙;(2)求证:AD AE =.23. (本小题满分10分)选修4-4:坐标系与参数方程 在平面直角坐标系xOy 中,设倾斜角为α的直线l的方程为2cos sin x t y t αα=+⎧⎪⎨=⎪⎩,(t 为参数),以O 为极点,x 轴的非负半轴为极轴建立极坐标系,曲线C 的极坐标方程为22413sin ρθ=+,直线l 与曲线C 相交于不同的两点,A B . (1)若3πα=,求线段AB 中点M 的直角坐标;(2)若2PA PB OP ∙=,其中P ,求直线l 的斜率. 24. (本小题满分10分)选修4-5:不等式选讲 设函数()21f x x x a =++-,a R ∈. (1)当2a =时,求不等式()4f x <的解集; (2)当12a <-时,对于1(,]2x ∀∈-∞-,都有()3f x x +≥成立,求a 的取值范围.太原市2016年高三年级模试题(二)数学试卷(理工类)参考答案一、选择题:1-5.ABCBB 6-10.CADBD 11-12.AB二、填空题:13.-5 14.1ln 22- 15. 2π16.1 三、解答题:17.解:(1)1n =时,可得24a =,∴{}n a 的奇数项和偶数项分别以4为公差的等差数列, 当*21,n k k N =-∈时,21422n k a a k n -==-=;当2n k =,*k N ∈时,242n k a a k n ===. ∴2n a n =*()n N ∈. (2)∵1111n n n b nb n ++=-,1111(1)(1)n n n b nb n n +=-++, ∴11111()(1)1n n nb n b n n--=----, 121111()(1)(2)21n n n b n b n n ---=------,…21111(1)22b b -=--, ∴131n n nb n+=, ∴1(2)31n b n n =≥+,1n =也适合,*1()31n b n N n =∈+, ∴2n n nc =,再由错位相减得222n n n T +=-.18.(1)证明:在ABC ∆中,∵222AB AC BC +=,∴AC AB ⊥,又∵1A B AC ⊥,且1,A B AB 是平面11ABB A 内的两条相交直线, ∴AC ⊥平面11ABB A , 又AC ⊂平面11ACC A ,∴平面11ABB A ⊥平面11ACC A . (2)在1A BA ∆中,∵22211A B AB AA +=, ∴1A B AB ⊥,双∵1A B AC ⊥,且,AB AC 是平面ABC 内的两条相交直线,∴1A B ⊥面ABC ,建立如图所示的坐标系,则(0,0,0)B ,(12,0,0)A ,(12,5,0)C ,1(0,0,5)A ,1(12,0,5)B -,取平面11ABB A 的一个法向量1(0,1,0)n = , 设平面11BCC B 的一个法向量2(,,)n x y z =,由21200n BB n BC ⎧∙=⎪⎨∙=⎪⎩ ,得12501250x z x y -+=⎧⎨+=⎩, 取5x =,则2(5,12,12)n =-,∴121212cos ,n n n n n n ∙==∙1A BB C --的大小为θ,则cos θ=, ∴13tan 12θ=,二面角1A BB C --的正切值为1312.19.解:(1)未来一周5天都组织集体活动的概率是32111()()25200P ==, 则至少有一天停止组织集体活动的概率是1991200P -=.(2)X 的取值是0,1,2,3,4,5, 则2(0)25P X ==, 311322314114567(1)()()()2552520025P X C C ==⨯⨯⨯+==,23213132332141141173(2)()()()()()2525525200P X C C C ==+⨯⨯⨯+=,13223132332111141443(3)()()()()()2525525200P X C C C ==+⨯⨯⨯+=,23231321111411(4)()()()25255200P X C C ==+⨯⨯⨯=,32111(5)()()25200P X ===,∴不需要停止组织集体活动的天数X 分布列是(3)因为函数2()1f x x x η=--在区间(3,5)上有且只有一个零点,且05η≤≤, 则(3)(5)0f f <,∴82435η<<, 故3η=或4, 故所求概率为:132231323123233223141141114114737129()[()()()()()][()()()]25255252552520025200P A C C C C C =+⨯⨯⨯++⨯⨯⨯+=+=20.(1)由题意:2c a =,22b a =,解得1,1b c ==, 所求椭圆的方程为2212x y +=. 设1122(,),(,)A x y B x y ,∵(1,0)F ,∴(0,1)C ,根据题意1213x x +=,12103y y ++=, 即123x x +=,121y y +=-.由221112x y += ①,222212x y += ② ①-②得12121212()()02x x y yy y x x +-++∙=-, ∴1212121232()2AB y y x x k x x y y -+==-=-+.(2)设(,)M M M x y ,(,)N N N x y ,(,)P P P x y ,(,)Q Q Q x y ,则由题意:2222MP NQ NP MQ +=+ ,即22222222()()()()()()()()M P M P N Q N Q N P N P M Q M Q x x y y x x y y x x y y x x y y -+-+-+-=-+-+-+-整理得:0N P M Q M P N Q N P M Q M P N Q x x x x x x x x y y y y y y y y +--++--=, 即()()()()0N M P Q N M P Q x x x x y y y y --+--=,所以12l l ⊥.①若直线12l l ⊥中有一条斜率不存在,不妨设2l 的斜率不存在,则2l x ⊥轴,所以MN =PQ =故四边形MPNQ的面积11222S PQ MN ==⨯=. ②若直线12,l l 的斜率存在,设直线1l 的方程为:(1)(0)y k x k =-≠,则由2212(1)x y y k x ⎧+=⎪⎨⎪=-⎩,得2222(21)4220k x k x k +-+-=,则22421M N k x x k +=+,222221M N k x x k -=+,M N MN x =-==,同理可求得,PQ =,故四边形MPNQ 的面积:2211416122922S PQ MN k k===≥+++ (当1k =±取“=”),此时,四边形MPNQ 面积S 的最小值为1629<, 所以直线1l 方程为:10x y --=或10x y +-=. 21.解:(1)设2()1x g a e ax bx =---,则[1,2]x ∈时,()g a 在[]0,1上为减函数, 所以只要(0)10x g e bx =--≤,所以只要10xe bx --≤在[1,2]上有解即可.即1x e b x -≥在[1,2]上有解,设1()x e h x x-=,因为'2(1)1()0x e x h x x -+=>,所以()h x 在[1,2]上为增函数,只要(1)1b h e ≥=-,所以b 的最小值是1e -.(2)2()1x f x e ax bx =---,'()2x f x e ax b =--, 由(1)0f =,得10e a b ---=,∴1b e a =--, ∴'()21x f x e ax e a =--++,又(0)0f =.若函数()f x 在区间(0,1)内有零点,设0x 为()f x 在区间(0,1)内的一个零点, 则由0(0)()0f f x ==可知,()f x 在区间0(0,)x 内不可能单调, 则'()f x 在区间0(0,)x 内不可能恒为正,也不可能恒为负,故'()f x 在区间0(0,)x 内存在零点1x ,同理'()f x 在区间0(,1)x 内存在零点2x , 故函数()f x 在区间(0,1)内至少有三个单调区间,'()f x 在区间(0,1)内至少有两个零点.设'()()2xu x f x e ax b ==--, ∴'()2x u x e a =-. 当12a ≤或2e a ≥时,函数'()f x 在区间(0,1)内单调, 不满足“函数()f x 在区间(0,1)内至少有三个单调区间”; 当122ea <<时,'()f x 在区间(0,ln(2))a 内单调递减,在区间(ln(2),1)a 内单调递增, 因此1(0,ln(2))x a ∈,2(ln(2),1)x a ∈,又'min ()(ln(2))22ln(2)132ln(2)1f x g a a a a e a a a a e ==--++=--+, 令()32ln(2)1v x x x x e =--+1()22ex <<,则'()12ln(2)v x x =-, 令'()0v x =,得x =依表格知:当22x <<时,max ()10v x e =+<, ∴'min ()32ln(2)10f x a a a e =--+<恒成立,于是,函数()f x 在区间(0,1)内至少有三个单调区间满足122(0)0(1)0e a u u ⎧<<⎪⎪>⎨⎪>⎪⎩,即1222010e a e a a ⎧<<⎪⎪-+>⎨⎪-+>⎪⎩, 解得21e a -<<,综上所述,a 的取值范围为(2,1)e -. 22.(1)∵,PE PB 分别是2O 的割线, ∴PA PE PD PB ∙=∙,又∵,PA PB 分别是1O 的切线和割线, ∴2PA PC PB =∙, ∴PE PDPA PC=, ∴PA PD PE PC ∙=∙. (2)连结,AC ED ,∵BC 是1O 的直径,∴090CAB ∠=, ∴AC 是2O 的切线, 由(1)知PA PCPE PD=,∴//AC ED , ∴AB DE ⊥,CAD ADE ∠=∠,又∵AC 是2O 的切线,∴CAD AED ∠=∠, ∴AED ADE ∠=∠,∴AD AE =,(或AB DE ⊥,∵AB 是2O 的直径,由垂径定理得, AD DE=,∴AD AE =.)23.解:(1)曲线C 的普通方程是2214x y +=, 当3πα=时,设点M 对应的参数为0t ,直线l方程为1222x t y ⎧=+⎪⎪⎨⎪=⎪⎩,(t 为参数),代入曲线C 的普通方程2214x y +=,得21356480t t ++=, 设直线C 上的点,A B 对应参数分别为12,t t ,则12028213t t t +==-, 所以点M的坐标为12(,13. (2)将2cos sin x t y t αα=+⎧⎪⎨=⎪⎩代入曲线C 的普通方程2214x y +=,得222(cos 4sin )4cos )120t t αααα++++=, 因为122212cos 4sin PA PB t t αα∙==+,27OP =,所以22127cos 4sin αα=+, 解得25tan 16α=,由于32cos cos )0ααα∆=->,故tan α=, 所以直线l24.解(1)令210x +=,得12x =-;令20x -=,得2x =. ①当2x ≥时,原不等式化为2124x x ++-<,即53x <,无解;②当122x -<<时,原不等式化为2124x x ++-<,即1x <,得112x -<<.③当12x ≤-时,原不等式化为2124x x --+-<,即1x >-,得112x -<≤-,所以原不等式的解集为{11}x x -<<. (2)令()()g x f x x =+,当12x ≤-时,()1g x x a x =---, 由12a <-,得11,()221,a a x g x x a x a⎧--<≤-⎪=⎨⎪-+-≤⎩,对于1(,]2x ∀∈-∞-使得()3f x x +≥恒成立,只需min ()3g x ≥ 1((,])2x ∈-∞-即可, 作出()g x 的大致图象,易知,min ()()1g x g a a ==--, ∴13a --≥,得4a ≤-。
【全国市级联考word】2017届山西省太原市高三第二次模拟考试理综化学试题(带解析)
试卷第1页,共9页绝密★启用前【全国市级联考word 】2017届山西省太原市高三第二次模拟考试理综化学试题(带解析)试卷副标题考试范围:xxx ;考试时间:36分钟;命题人:xxx学校:___________姓名:___________班级:___________考号:___________注意事项.1.答题前填写好自己的姓名、班级、考号等信息 2.请将答案正确填写在答题卡上第I 卷(选择题)一、选择题(题型注释)1、已知:25℃时,电离常数K b (NH 3·H 2O)=1.8×l0-5,CH 3COOH 的电离常数与其相等。
现向1 L 0.1 mol•L -1氨水中加入等体积的0.1 mol•L -1CH 3COOH 溶液,则下列说法正确的是A .在滴加过程中,K w 始终保持不变B .25℃时,反应后溶液中 c(NH 4+)>c(CH 3COO -)C .若用氨水标准溶液滴定盐酸,则应选择酚酞作为指示剂D .25℃时,反应NH 4++H 2ONH 3•H 2O+H +的平衡常数约为 5.6 ×10-10试卷第2页,共9页2、工业上利用无机矿物资源生产部分材料的流程示意图如下。
下列说法不正确的是A.在铝土矿制备较高纯度Al的过程中常用到NaOH溶液、CO2气体、冰晶石B.石灰石、纯碱、石英、玻璃都属于盐,都能与盐酸反应C.在制粗硅时,被氧化的物质与被还原的物质的物质的量之比为2∶1D.黄铜矿(CuFeS2)与O2反应产生的Cu2S、FeO均是还原产物3、下列实验操作、现象和对应的实验结论均正确的是A. AB. BC. CD. D4、下列说法对应的离子方程式合理的是A.纯碱溶液去油污:CO32-+H2O=HCO3-+OH-B.泡沫灭火器工作原理:2Al3++3CO32-+3H2O= 2A1(OH)3↓+3CO2↑C.明矾溶液中加入过量的氢氧化钡溶液:Al3++SO42-+Ba2++4OH-=BaSO4↓+AlO2-+2H2O D.用石墨为电极,电解Pb(NO3)2和Cu(NO3)2的混合溶液制取PbO2时,阳极上发生的试卷第3页,共9页电极反应式:Pb 2++2 H 2O-2e -=PbO 2+4H +5、短周期元素a 、b 、c 、d 分属三个周期,且原子序数依次增大。
郑州一中高中生物试题及答案-山西省太原市2017届高三第二次模拟考试理综(解析版)
山西省太原市2017届高三第二次模拟考试理综1. 结构与功能相适应是生物学的基本观点,下列相关叙述正确的是A. 核仁与核糖体的形成密切相关,干细胞中的核仁有利于合成rRNAB. 效应T细胞中溶酶体发达可直接用于裂解靶细胞C. 人小肠上皮细胞和红细胞吸收葡萄糖的载体蛋白相同D. mRNA、tRNA和rRNA的合成和加工的场所都在细胞核2. —种除草剂能破坏某双子叶植物细胞的生物膜从而干扰其代谢反应,施用该除草剂可直接影响该植物叶肉细胞中的A. 基因的复制和转录B. 水的光解C. C3化合物的固定D. 多肽链的合成3. 下列有关人体细胞周期的调控因素中错误的是A. 环境因子:一定的离子辐射、化学物质作用和病毒感染B. 调控细胞周期的内因包括与细胞周期有关的酶和抑制因子、生长素等各种激素C. 环境因子:一定的温度变化和pH变化D. 调控细胞周期的内因包括生长因子、原癌基因与抑癌基因的编码产物等4. 有科学家发现普遍存在于动物中的磁受体基因,其编码的次数提蛋白能识别外界磁场和顺应磁场方向排列,并据此提出一个新的“生物指南针”分子模型。
下列叙述正确的是A. 磁受体基因的骨架是由磷酸和核糖相间排列而成的B. 基因中相邻磚基之间通过一个五碳糖和一个磷酸相连C. 同位素标记该基因中的两条链,每次复制后带有标记的DNA分子数目不变D. 翻译时,每种密码子都有与之相对应的反密码于5. 下列人类遗传病调査和优生的叙述错误的是A. 调查人群中的遗传病时,最好选取群体中发病率较高的单基因遗传病B. 常见的优生措施有禁止近亲结婚、提倡适齡生育和进行产前检测等C. 对遗传病的发病率进行统计时,只需在患者家系中进行调査D. 通过基因诊断确定脍儿不携带致病基因,但也有可能患染色体异常遗传病6. 下列有关实验的说法中,正确的是A. 低温诱导染色体数目加倍实验中,须将大蒜根尖制成装片后再进行低温处理B. 调查土壤中小动物类群丰富度统计的方法逋常采用取样器取样法C. 统计种群密度时,应去掉采集数据中最大、最小值后取平均值D. 研究蝾螈细胞核功能的实验中.须将其受精卵横缢成有核和无核两部分7. 下面两图是光合作用和细胞呼吸的相关实验数据曲线和装置图。
山西省太原市2017-2018学年高三第二次模拟考试文数试题 Word版含答案
2017-2018学年 数学试卷(文史类)第Ⅰ卷一、选择题:本大题共12个小题,每小题5分,共60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.已知全集U R =,集合{24}A x x =<<,2{60}B x x x =--≤,则()U AC B 等于( ) A .(2,3] B .(3,4) C .[2,4)- D .(,2)(3,4)-∞-2.如图,在复平面内,表示复数z 的点为A ,则复数12zi-对应的点在( ) A .第一象限 B .第二象限 C .第三象限 D .第四象限3. 下列函数中,既是偶函数,又在(0,)+∞单调递增的函数是( )A .2y x =- B .2xy -= C .1y x=D .lg y x = 4.已知非零向量,a b 满足a b =,且()(23)a b a b -⊥+,则a 与b 的夹角为( )A .3π B .4π C .23π D .34π5.某几何体的三视图如图所示,图中的四边形都是边长为2的正方形,两条虚线互相垂直,则该几何体的体积是( ) A .163 B .203 C .86π- D .83π-6.将函数sin y x x =的图象沿x 轴向右平移a 个单位(0a >),所得图关于y 轴对称,则a 的值可以是( ) A .6π B .2π C .6π- D .3π-7. 执行下图所示的程序框图,若输入390a =,156b =,则输出的a 的值是( ) A .234 B .39 C .78 D .1568.若变量,x y 满足约束条件142x y x y y -≥-⎧⎪+≤⎨⎪≥⎩,则目标函数24z x y =+的最大值为( )A .10B .11C .12D .139.若正三棱住的所有棱长均为a,且其体积为 )A .83πB .283π C .3π D .43π 10.设等差数列{}n a 的前n 项和为n S ,且满足170S >,180S <,则11S a ,22S a ,…,1515S a 中最大的项为( ) A .77S a B .88S a C .99S a D .1010Sa 11.如图,已知双曲线2222:1x y C a b-=(0,0)a b >>的右顶点为,A O 为坐标原点,以A 为圆心的圆与双曲线C 的一条渐近线交于两点P ,Q ,若060PAQ ∠=,且3OQ OP =,则双曲线C 的离心率为( ) ABCD12.已知函数2()log 1f x x =-,且关于x 的方程2[()]()20f x af x b ++=有6个不同的实数解,若最小的实数解为-1,则a b +的值为( ) A .-2 B .-1 C .0 D .1第Ⅱ卷(非选择题 共90分)二、填空题(本大题共4小题,每小题5分,共20分.)13.已知函数()4ln f x x x =-,则曲线()y f x =在点(1,(1))f 处的切线方程为____________.14.若抛物线22(0)y px p =>的准线经过椭圆22195x y +=的一个焦点,则该抛物线的准线方程为____________.15.在ABC ∆中,角,,A B C 的对边分别是,,a b c ,若B C ∠=∠,且2227a b c ++=则ABC ∆的面积最大值为____________.16.若关于x 的函数2222sin ()tx x t xf x x t +++=+(0t >)的最大值为M ,最小值为N ,且4M N +=,则实数t 的值为____________.三、解答题 :解答应写出文字说明、证明过程或演算步骤.17.(本小题满分12分)已知数列{}n a 的前n 项和为n S ,首项为1a ,且12,n a ,n S 成等差数列. (1)求数列{}n a 的通项公式;(2)数列{}n b 满足221223(log )(log )n n n b a a ++=⨯,求数列1n b ⎧⎫⎨⎬⎩⎭的前n 项和n T . 18.(本小题满分12分)某校从高一年级学生中随机抽取40名学生,将他们的期中考试数学成绩(满分100分,成绩均为不低于40分的整数)分成如下六段:[40,50),[50,60),…,[90,100],得到如图所示的频率分布直方图.(1)若该校高一年级共有学生640名,试估计该校高一年级期中考试数学成绩不低于60分的人数;(2)在抽取的40名学生中,若从数学成绩在[40,50)与[90,100]两个分数段内随机选取2名学生,求这2名学生的数学成绩之差的绝对值不大于10的概率.19.(本小题满分12分)如图,在多面体111ABC A B C -中,四边形11ABB A 是正方形,1ACB∆是正三角形,1AC AB ==,11//B C BC ,112BC B C =.(1)求证:1//AB 平面11AC C ; (2)求多面体111ABC A B C -的体积.20.(本小题满分12分)已知椭圆22221(0)x y a b a b +=>>的离心率3e =,直线y x =与椭圆交于,A B 两点,C 为椭圆的右顶点,32OA OC ∙=. (1)求椭圆的方程;(2)若椭圆上存在两点,E F ,使OE OF OA λ+=,(0,2)λ∈,求OEF ∆面积的最大值. 21.(本小题满分12分) 设函数2()ln f x x bx a x =+-.(1)若2x =是函数()f x 的极值点,1和0x 是函数()f x 的两个不同零点,且0(,1)x n n ∈+,n N ∈,求n .(2)若对任意[2,1]b ∈--,都存在(1,)x e ∈,使得()0f x <成立,求实数a 的取值范围.请考生在22、23、24三题中任选一题作答,如果多做,则按所做的第一题记分,作答时请写清题号.22.(本小题满分10分)选修4-1:几何证明选讲如图,1O 与2O 相交于,A B 两点,AB 是2O 的直径,过A 点作1O 的切线交2O 于点E ,并与1BO 的延长线交于点P ,PB 分别与1O ,2O 交于,C D 两点.(1)求证:PA PD PE PC ∙=∙; (2)求证:AD AE =.23. (本小题满分10分)选修4-4:坐标系与参数方程在平面直角坐标系xOy 中,设倾斜角为α的直线l的方程为2cos sin x t y t αα=+⎧⎪⎨=⎪⎩,(t 为参数),以O 为极点,x 轴的非负半轴为极轴建立极坐标系,曲线C 的极坐标方程为22413sin ρθ=+,直线l 与曲线C 相交于不同的两点,A B . (1)若3πα=,求线段AB 中点M 的直角坐标;(2)若2PA PB OP ∙=,其中P ,求直线l 的斜率. 24. (本小题满分10分)选修4-5:不等式选讲 设函数()21f x x x a =++-,a R ∈. (1)当2a =时,求不等式()4f x <的解集; (2)当12a <-时,对于1(,]2x ∀∈-∞-,都有()3f x x +≥成立,求a 的取值范围.太原市2016年高三年级模试题(二)数学试卷(文史类)参考答案一、选择题:1-5.BCDDB 6-10.ACDBC 11-12.AB二、填空题:13. 340x y +-= 14. 2x =- 15.516.2 三、解答题:17.解:(1)∵12,n a ,n S 成等差数列,∴122n n a S =+, 当1n =时,11122a S =+,∴112a =,当2n ≥时,1122n n n n n a S S a a --=-=-,∴12nn a a -=, 所以数列{}n a 是首项为12,公比为2的等比数列, 22n n a -=*()n N ∈.(2)∵21223322122322log log log 2log 2(21)(21)n n n n n b a a n n +-+-++=⨯=⨯=-+,21nn =+ 18.解:(1)由10(0.0050.010.020.0250.01)1a ⨯+++++=, 得0.03a =.根据频率分布直方图,成绩不低于60分的频率为110(0.0050.01)0.85-⨯+=. 估计期中考试数学成绩不低于60分的人数约为6400.85544⨯=.(2)成绩在[40,50)分数段内的人数为400.052⨯=,成绩在[90,100]分数段内的人数为400.14⨯=,则记在[40,50)分数段的两名同学为12,A A ,在[90,100]分数段内的同学为1234,,,B B B B ,若从这6名学生中随机抽取2人,则总的取法共有15种.如果2名学生的数学成绩都在[40,50)分数段内或都在[90,100]分数段内,那么这2名学生的数学成绩之差的绝对值不大于10;则所取2名学生的数学成绩之差的绝对值不大于10的取法有12(,)A A ,12(,)B B ,13(,)B B ,14(,)B B ,23(,)B B ,24(,)B B ,34(,)B B 共7种取法,所以所求概率为715P =. 19.证明:(1)取BC 中点D ,连11,,AD B D C D , ∵11//B C BC ,112BC B C =∴四边形11BDC B ,11CDB C 是平行四边形,∴1C D //=1B B ,11//CC B D , 在正方形11ABB A 中,11//BBAA , ∴1C D //=1AA , ∴四边形11ADC A 为平行四边,∴11//AD AC , ∵1B DAD D =,∴平面1//ADB 平面11AC C ,又1AB ⊂平面1ADB ,∴1//AB 平面11AC C(2)在正方形1ABB A 中,1A B =1A BC ∆是等边三角形,所以1AC BC =所以22211AC AA AC +=,222AB AC BC +=,于是1AA AC ⊥,AC AB ⊥,又1AA AB ⊥,∴1AA ⊥平面ABC ,∴1AA CD ⊥, 又CD AD ⊥,1ADAA A =,∴CD ⊥平面11ADC A ,于是多面体111ABC A B C -是由直三棱柱111ABD A B C -和四棱锥11C ADC A -组成. 又直三棱柱111ABD A B C -的体积为111(11)1224⨯⨯⨯⨯=, 四棱锥11C ADC A -的体积为1113226⨯⨯=, 故多面体111ABC A B C -的体积为1154612+=.20.解:(1)根据题意,不妨设(,)A t t ,则(,)OA t t =,(,0)OC a =,∴32a t ∙=,22221t t a b +=,3c a =,222a b c -=,解得:23a =,21b =,∴椭圆的方程为:2213x y +=. (2)设11(,)E x y ,22(,)F x y ,EF 中点为00(,)M x y ,由(1)t =,∵OE OF OA λ+=,∴01201222x x x y y y ⎧=+=⎪⎪⎨⎪=+=⎪⎩,∵,E F 椭圆上,则221122221313x y x y ⎧+=⎪⎪⎨⎪+=⎪⎩,相减可得2222121203x x y y -+-=, 121212121133EF y y x x k x x y y -+==-∙=--+,∴直线EF的方程为:1()434y x -=--,即3x y =-, 代入2213x y +=整理得:22410y y λ-+-=,∴12y y +=,21214y y λ-∙=,12EF y y =-==, ∵原点(0,0)O 到直线EF的距离为h =,221422OEFS EF h λλ∆+-===≤=当λ=OEF ∆面积的最大值为2. 21.解(1)'()2a f x x b x=+-, ∵2x =是函数()f x 的极值点,∴'(2)402af b =+-=. ∵1是函数()f x 的零点,得(1)10f b =+=,由40210a b b ⎧+-=⎪⎨⎪+=⎩,解得6,1a b ==-. ∴2()6ln f x x x x =--,'6()21f x x x=--,令'()0f x <,得02x <<,令'()0f x >,得2x >,所以()f x 在(0,2)上单调递减;在(2,)+∞上单调递增.故函数()f x 至多有两个零点,其中1(0,2)∈,0(2,)x ∈+∞,因为(2)(1)0f f <<,(3)6(1ln3)0f =-<,(4)6(2ln 4)12(1ln 2)0f =-=->, 所以0(3,4)x ∈,故3n =.(2)令2()ln g b xb x a x =+-,[2,1]b ∈--,则()g b 为关于b 的一次函数且为增函数, 根据题意,对任意[2,1]b ∈--,都存在(1,)x e ∈,使得()0f x <成立,则2max ()(1)ln 0g b g x x a x =-=--<在(1,)x e ∈有解,令2()ln h x x x a x =--,只需存在0(1,)x e ∈使得0()0h x <即可, 由于2'2()21a x x a h x x x x --=--=, 令2()2x x x a ϕ=--,(1,)x e ∈,'()410x x ϕ=->,∴()x ϕ在(1,)e 上单调递增,()(1)1x a ϕϕ>=-,①当10a -≥,即1a ≤时,()0x ϕ>,即'()0h x >, ()h x 在(1,)e 上单调递增,∴()(1)0h x h >=,不符合题意.②当10a -<,即1a >时,(1)10a ϕ=-<,2()2e e e a ϕ=--,若221a e e ≥->,则()0e ϕ<,所以在(1,)e 上()0x ϕ<恒成立,即'()0h x <恒成立, ∴()h x 在(1,)e 上单调递减,∴存在0(1,)x e ∈,使得0()(1)0h x h <=符合题意. 若221e e a ->>,则()0e ϕ>,∴在(1,)e 上一定存在实数m ,使得()0m ϕ=, ∴在(1,)m 上()0x ϕ<恒成立,即'()0h x <恒成立,()h x 在(1,)m 上单调递减, ∴存在0(1,)x m ∈,使得0()(1)0h x h <=,符合题意.综上所述,当1a >时,对任意[2,1]b ∈--,都存在(1,)x e ∈,使得()0f x <成立.22.(1)∵,PE PB 分别是2O 的割线,∴PA PE PD PB ∙=∙,又∵,PA PB 分别是1O 的切线和割线, ∴2PA PC PB =∙, ∴PE PD PA PC=, ∴PA PD PE PC ∙=∙.(2)连结,AC ED ,∵BC 是1O 的直径,∴090CAB ∠=, ∴AC 是2O 的切线, 由(1)知PA PC PE PD=,∴//AC ED , ∴AB DE ⊥,CAD ADE ∠=∠,又∵AC 是2O 的切线,∴CAD AED ∠=∠,∴AED ADE ∠=∠,∴AD AE =,(或AB DE ⊥,∵AB 是2O 的直径,由垂径定理得,AD DE =,∴AD AE =.)23.解:(1)曲线C 的普通方程是2214x y +=, 当3πα=时,设点M 对应的参数为0t ,直线l方程为122x t y ⎧=+⎪⎪⎨⎪=⎪⎩,(t 为参数),代入曲线C 的普通方程2214x y +=,得21356480t t ++=, 设直线C 上的点,A B 对应参数分别为12,t t ,则12028213t t t +==-, 所以点M的坐标为12(,1313-. (2)将2cos sin x t y t αα=+⎧⎪⎨=⎪⎩代入曲线C 的普通方程2214x y +=,得222(cos 4sin )4cos )120t t αααα++++=, 因为122212cos 4sin PA PB t t αα∙==+,27OP =,所以22127cos 4sin αα=+, 解得25tan 16α=,由于32cos cos )0ααα∆=->,故tan 4α=, 所以直线l的斜率为4. 24.解 (1)令210x +=,得12x =-;令20x -=,得2x =. ①当2x ≥时,原不等式化为2124x x ++-<,即53x <,无解; ②当122x -<<时,原不等式化为2124x x ++-<,即1x <,得112x -<<. ③当12x ≤-时,原不等式化为2124x x --+-<,即1x >-,得112x -<≤-, 所以原不等式的解集为{11}x x -<<.(2)令()()g x f x x =+,当12x ≤-时,()1g x x a x =---, 由12a <-,得11,()221,a a x g x x a x a⎧--<≤-⎪=⎨⎪-+-≤⎩, 对于1(,]2x ∀∈-∞-使得()3f x x +≥恒成立,只需min ()3g x ≥ 1((,])2x ∈-∞-即可, 作出()g x 的大致图象,易知,min [()]()1g x g a a ==--,∴13a --≥,得4a ≤-。
山西省太原市2017届高三第二次模拟考试理综生物试题
1. 结构与功能相适应是生物学的基本观点,下列相关叙述正确的是A. 核仁与核糖体的形成密切相关,干细胞中的核仁有利于合成rRNAB. 效应T细胞中溶酶体发达可直接用于裂解靶细胞C. 人小肠上皮细胞和红细胞吸收葡萄糖的载体蛋白相同D. mRNA、tRNA和rRNA的合成和加工的场所都在细胞核【答案】A2. —种除草剂能破坏某双子叶植物细胞的生物膜从而干扰其代谢反应,施用该除草剂可直接影响该植物叶肉细胞中的A. 基因的复制和转录B. 水的光解C. C3化合物的固定D. 多肽链的合成【答案】B【解析】基因的复制和转录主要发生在细胞核中,与生物膜没有直接关系,A错误;水的光解发生在叶绿体类囊体薄膜上,B正确;C3化合物的固定发生在叶绿体基质中,与生物膜无关,C错误;多肽链的合成发生在核糖体,而核糖体是没有膜结构的细胞器,D错误。
3. 下列有关人体细胞周期的调控因素中错误的是A. 环境因子:一定的离子辐射、化学物质作用和病毒感染B. 调控细胞周期的内因包括与细胞周期有关的酶和抑制因子、生长素等各种激素C. 环境因子:一定的温度变化和pH变化D. 调控细胞周期的内因包括生长因子、原癌基因与抑癌基因的编码产物等【答案】B【解析】影响人体细胞周期的环境因素有物理辐射、化学物质、病毒、温度、pH等,AC正确;生长素属于植物激素,人体细胞没有生长素,B错误;调控细胞周期的内因包括生长因子、原癌基因与抑癌基因的编码产物等,D正确。
4. 有科学家发现普遍存在于动物中的磁受体基因,其编码的次数提蛋白能识别外界磁场和顺应磁场方向排列,并据此提出一个新的“生物指南针”分子模型。
下列叙述正确的是A. 磁受体基因的骨架是由磷酸和核糖相间排列而成的B. 基因中相邻磚基之间通过一个五碳糖和一个磷酸相连C. 同位素标记该基因中的两条链,每次复制后带有标记的DNA分子数目不变D. 翻译时,每种密码子都有与之相对应的反密码于【答案】C5. 下列人类遗传病调査和优生的叙述错误的是A. 调查人群中的遗传病时,最好选取群体中发病率较高的单基因遗传病B. 常见的优生措施有禁止近亲结婚、提倡适齡生育和进行产前检测等C. 对遗传病的发病率进行统计时,只需在患者家系中进行调査D. 通过基因诊断确定脍儿不携带致病基因,但也有可能患染色体异常遗传病【答案】C【解析】调查人群中的遗传病时,最好选取群体中发病率较高的单基因遗传病,A正确;常见的优生措施有禁止近亲结婚、遗传咨询、提倡适齡生育、进行产前检测等,B正确;研究某种遗传病的发病率,应在人群中随机抽样调查取样,并用统计学方法进行计算,C错误;通过基因诊断确定胎儿不携带致病基因,但也有可能患染色体异常遗传病,D正确。
