通州市三余中学高三第三次模拟考试 (6)
高三政治-江苏通州市三余中学模考高频错题(选择题)一 最新
江苏通州市三余中学模考高频错题(选择题)一1.用酵母菌酿酒的主要阶段为:加料→接种→通气培养→密封发酵。
从接种后到密封前这一阶段,酵母菌种群数量变化的曲线图为2.关于人体淋巴T 细胞的叙述中,正确的是A .在反应阶段,能释放出淋巴因子,加强各种细胞的作用来发挥免疫效应B .由淋巴结、脾、扁桃体等淋巴器官产生C .由造血干细胞发育成的T 细胞大部分很快死亡,只有一部分受抗原刺激时增生分化成效应T 细胞D .能与靶细胞亲密接触,激活靶细胞内的溶酶体酶,将抗原直接消灭3.假设狼有a 种蛋白质,兔有b 种蛋白质,狼捕食兔子后,则狼体内一个细胞中含有的蛋白质种类最可能是 A .少于a B .a+b C .a D .多于a ,少于a+b4.赤潮微生物能在富营养化水体中大量繁殖并分泌毒素形成有毒赤潮,若下图为赤潮微生物的 生长曲线图,则毒素形成的时期是 A .1时期 B .2时期 C .3时期 D .4时期5.下列叙述中,符合微生物培养基配制原则的是 A .自养型微生物的培养基可以由简单的无机物组成B .在谷氨酸生产过程中,要使菌体大量繁殖,培养基中的碳氮比心为3:1C .放线菌培养时应将培养基配成弱酸性D .培养基中的蔗糖溶液浓度越高,越能促进微生物的生长 6.图表示某有机物加入相关的酶后在O ℃-80℃环境中.有机物的分解总量与温度的关系。
依图判断在0℃-80℃环境中,下列有关酶的活性变化曲线(pH 适宜)正确的是7 下列化学物质中,能够参与体液调节的有A .二氧化碳B .氢离子C .胰岛A 细胞的分泌物 D.胰岛B 细胞的分泌物答案:1.D2.C3.A4.C5.A6.B7.ABCD时间时间时间时间 ABCD江苏通州市三余中学模考高频错题(选择题)二1.当氧气含量升高时,下列哪一项是不可能发生的 A.沼气池内沼气生成量减少 B.牛奶变酸速度减慢C .血液中血红蛋白含量升高 D .酵母菌分解葡萄糖速度加快 2.在考察被严重污染的地表水体时发现,有机型污染水体是变黑发臭,无机型污染水体一般是变绿。
江苏通州市三余中学模考高频错题及其中的知识点一
江苏通州市三余中学模考高频错题及其中的知识点一1.在用葡萄糖和乳糖作碳源的培养基上培养大肠杆菌,大肠杆菌的生长曲线(a~e为生长时期)、以及培养液中葡萄糖和乳糖的含量变化曲线如下左图所示。
⑪以下有关叙述正确的是A.能产生分解葡萄糖的酶的时期为a~eB.a、c期菌体代谢活跃,体积增长较快C.能产生分解乳糖的酶的时期为c~eD.e期大肠杆菌出现多种形态,甚至畸形⑫在上右图中画出大肠杆菌的生长速率曲线。
⑬b、d时期的特征有,e时期的特征有。
3.(8分)右下面表示人的性染色体简图,x和Y染色体有一部分是同源的(图中I片段);另一部分是非同源的(图中Ⅱ和III片段),该部分基因不互为等位。
回答下列问题:(1)若X染色体的I片段上有基因A,则Y染色体上的I片段相应位置上的基因为。
就这种基因而言,男性的基因型可能有,女性的基因型可能有。
若某男子为色盲(由b基因控制),且在III片段上有另一种隐性致病基因i,则该男子与不携带致病基因的正常女子结婚,所生子女的基因型为(2)人类的进行性肌营养不良由位于X染色体的Ⅱ片段上的隐性基因控制,一女性携带者与正常男子婚配,生下一个性腺发育不良的女性患者(缺少了一条X染色体),则该女性患者可能同时患进行性肌营养不良吗?(3)如果此图表示果蝇的性染色体简图,现有一白眼雌果蝇与一红眼雄果蝇交配,子代中雌果蝇均为红眼,雄果蝇均为白眼,则控制眼色的基因最可能位于片段上。
⑭图中的X上的Ⅰ、Ⅱ片段中的各一个基因互称为。
这两个基因不符合基因的自由组合定律,因为;这两个基因在两个X染色体上时,可能发生基因重组,因为4.下图中,有性生殖过程是 ,胚胎发育过程是 ,胚后发育过程是 ,个体发育过程是 .5.叶绿体中,能吸收光能的色素有 ,能传递光能的色素有 , 能转换光能的色素有 , 主要吸收红橙光和蓝紫光的色素有 ,主要吸收蓝紫光的色素有 . 在叶绿体中的色素分离实验中,在层析液中溶解度最大的是色的 , 在滤纸上扩散最慢的是是色的 ,这两种色素都能光能. 位于滤纸条从上往下第条位置上的(部分、全部)色素(呈色),能通过电子传递物质从水中夺取电子并通过将电子传递给辅酶A,在这个过程中,光能转换为能,并储存到光反应产生的中而成为。
北京市通州区高三三模数学试题(解析版)
一:选择题 : 在每小题列出的四个选项中,选出符合题目要求的一项 。 1.已知集合 P 0,1,2 , Q { x | x 2} ,则 P Q =
A. 0
B. {0,1}
C. 1,2
D. {0, 2}
【答案】 B
【解析】 【分析】
根据集合交集的概念,可直接得出结果 .
【详解】因为集合 P {0,1,2} , Q { x | x 2} ,所以 P Q {0,1} .
故选 B
【点睛】本题主要考查集合的交集运算,熟记概念即可,属于基础题型
.
2i 2. 设复数
a bi( a, b R ) ,则 a b ( )
1i
A. 0
B. 1
C. 2
【答案】 A
【解析】
【分析】
2i
先由复数的除法运算,化简
3.执行如图所示的程序框图,输出的 s 值为 ( )
3
A.
4
【答案】 A
7
B.
8
【解析】 【分析】
根据程序框图,逐步执行,即可得出结果 .
15
C.
16
【详解】初始值 k 1, s 0 ,
11
第一步: s 0
,k 1 1 2 3,进入循环;
22
第二步: s
1
1
3 ,k
2 1 3 ,结束循环,输出 s
3
,再由复数相等,即可求出结果 .
1i
2i 2i (1 i)
【详解】因为
1 i (1
1i
所以 a 1,b 1 ,因此 a b 0.
故选 A
D. 1
【点睛】 本题主要考查复数的运算与复数相等, 熟记复数的除法运算法则、 以及复数相等的充要条件即可, 属于常考题型 .
江苏通州市三余中学模考高频错题(选择题)3
江苏通州市三余中学模考高频错题(选择题)31.要相获得大量单克隆抗体就必须用单个B淋巴细胞进行无性繁殖,形成细胞群。
原因是A.在体外培养条件下,B淋巴细胞可以无限增殖B.在动物体内,每种B淋巴细胞可产生多达数百万种以上的抗体C.每一个B淋巴细胞都参与特异性免疫反应D.每一个B淋巴细胞只分泌一种特异性抗体2.右图是人体一个细胞的一次分裂过程中,细胞核内DNA分子数(无阴影)和染色体数(阴影)在1、2、3、4四个时期的统计数据。
假如没有发生变异,则同染色体分离发生在A.1B.2C.3D.43.使人产生渴觉的感受器和神经中枢分别位于A.大脑皮层和下丘脑 B.下丘脑和大脑皮层C.下丘脑的神经细胞和垂体后叶 D.肾上腺和下丘脑4.长期饥饿状态下,人血液中的血糖含量仍能维持在一定水平,其血糖的主要来源是A.肝糖元水解 B.肌糖元分解 C.淀粉分解 D.其他物质转化5.下列关于细胞周期的说法不正确的是A.具有特定形态、结构和功能的成熟细胞没有细胞周期B.细胞周期是一个与代谢有关的过程,温度越高所需的时间越长C.细胞的种类不同,一个细胞周期的时间也可能不相同D.一个新细胞分裂成两个新细胞所需的时间为一个细胞周期6.某动物的一个初级卵母细胞的细胞核中DNA含量若为4a,则该动物的整个卵细胞中DNA含量准确地讲应:A.等于2aB.大于2aC.等于aD.大于a7.用右图所示的坐标表示生物学中某些现象,其中解释不合理的是A.该坐标可用来表示叶片年龄与其叶绿素含量的关系B.若该坐标表示一个生态系统内的生物,在单位时间内有机物合成量随时间的变化过程,则a~b段表示环境出现剧烈变化C.若该坐标表示青霉菌生长曲线时,c点是提取青霉素的最佳时间D.若该坐标表示一个国家人口数量随时间变化时,在a~b段,该国老人数量比例较小8.生命活动离不开细胞,对此正确的理解是A.没有细胞结构的病毒必需寄生在活细胞内才能繁殖B.单细胞生物体具有生命的基本特征——新陈代谢、应激性、繁殖…C.多细胞生物体的生命活动由不同程度分化的细胞密切合作完成D.细胞是一切生物体结构和功能的基本单位9.下列各项说法中,正确的是蛋白质功能A RNA聚合酶参与DNA的复制B 胰岛素调节血糖浓度C 干扰素与抗原结合D 固氮酶参与氮的还原10.下列各项叙述中,正确的是A.效应B细胞和骨髓瘤细胞融合为杂交瘤细胞后,经选择、培养就可以用来生产单克隆抗体B.接种过SARS疫苗的人一般不会再患“非典”,是因体内已经形成该病毒的记忆细胞和抗体C.信使RNA分子的碱基数量大约是相应基因内含子碱基数量的1/2D.如果以信使RNA为模板,通过逆转录,就可以获得目的基因的一条链11.如图所示某动物体细胞(含4条染色体)有丝分裂的一个周期,对细胞周期的叙述正确的是A.细胞e形成的子细胞,其发育方向有两种可能,一种如图所示,另一种分化形成各种组织B.细胞中含有4条染色体的时期是a、b、dC.细胞周期的长短通常受温度的影响D.调控细胞周期的基因发生突变,导致细胞周期失控,形成无限增殖的癌细胞12.“筛选”是生物学中培育生物新类型常用的手段,下列有关技术能筛选成功的是A.在无氮培养基上筛选出共生固氮菌B.在细胞工程中利用双亲细胞的特性可对杂种细胞进行筛选C.在小麦试验田中普遍喷洒赤霉菌筛选抗赤霉菌小麦D.基因工程中通过对细胞单独培养并检测目的基因产物进行筛选1 2 3 4 5 6 7 8 9 10 11 12D B B D B D B ABC BD ABD ACD BCD。
江苏省通州市三余中学高三模拟考试数学试题.4
江苏省通州市三余中学高三模拟考试数学试题一、填空题: 1. 已知)(),(),(),(13,75,31,-b D C B a A 是菱形ABCD 的四个顶点,则=+b a __________ 2.若cos 22π2sin 4αα=-⎛⎫- ⎪⎝⎭,则cos sin αα+= 3.已知O 为直角坐标系原点,P 、Q 的坐标满足不等式组⎪⎩⎪⎨⎧≥-≤+-≤-+0102202534x y x y x ,则POQ ∠cos 的最小值为__________4.设A ,B 是x 轴上的两点,点P 的横坐标为2,且PA PB =,若直线PA 的方程为10x y -+=,则直线PB 的方程是_____________________5. 过△ABC 的重心任作一直线分别交AB ,AC 于点D 、E .若AD xAB =,AE y AC =,0xy ≠,则11x y+的值为___________ 6.若两个函数的图象经过若干次平移后能够重合,则称这两个函数为“同形”函数,给出下列三个 函数:()1sin cos ,f x x x =+ ()222f x x =()3sin f x x =则_______为“同形”函数 7.椭圆122=+by ax 与直线x y -=1交于A 、B 两点,过原点与线段AB 中点的直线的为ba则,23=________ 8.一次研究性课堂上,老师给出函数)(||1)(R x x xx f ∈+=,三位同学甲、乙、丙在研究此函数时分别给出命题:甲:函数f (x )的值域为(-1,1); 乙:若x 1≠x 2,则一定有f (x 1)≠f (x 2);丙:若规定||1)()),(()(),()(11x n xx f x f f x f x f x f n n n +===-则对任意*∈N n 恒成立.你认为上述三个命题中正确的个数有__________个9.过定点P (1,2)的直线在x y 轴与轴正半轴上的截距分别为a b 、,则422a b +的最小值 为10.{}n a 是等差数列,满足10041006OC a OA a OB =+,而AB AC λ=,则数列{}n a 前项之和2009S 为 .11.“已知数列{}n a 为等差数列,它的前n 项和为n S ,若存在正整数(),m n m n ≠,使得m n S S =,则0m n S +=。
北京市通州区高三三模数学试卷(解析版)
15.在 中,角 的对边分别为 , , , .
(1)求 的值;
(2)若 为 边上的点,且 ,求 .
【答案】(Ⅰ) (Ⅱ)
【解析】
【分析】
(Ⅰ)先由余弦定理,得到 ,代入数据,即可求出结果;
(Ⅱ)先由正弦定理得到 ,求出 ,结合题中条件,即可得出结果.
因为直线 恒过 ,
由图像可得,当直线 过 与 的交点时,恰好不能构成三角形,
易得 与 的交点为
因此,为满足题意,只需直线 的斜率 .
所以 .
故选A
【点睛】本题主要考查简单的线性规划,只需由约束条件作出可行域,结合图像求解即可,属于常考题型.
6.设 , 均为单位向量,则“ 与 夹角为 ”是“ ”的( )
解得 ,即 与 夹角为 ,
所以,由“ ”不能推出“ 与 夹角为 ”
因此,“ 与 夹角为 ”是“ ”的既不充分也不必要条件.
故选D
【点睛】本题主要考查充分条件与必要条件的判断,以及向量的数量积运算,熟记充分条件与必要条件的概念,以及向量的数量积运算法则即可,属于常考题型.
7.在平面直角坐标系中,记曲线 为点 的轨迹,直线 与曲线 交于 两点,则 的最小值为( )
【详解】解:(Ⅰ)由题意知,本月共卖出30台机器,
利润率高于0.2的是第一类和第四类,共有10台.
设“这台机器利润率高于0.2”为事件 ,
则 .
(Ⅱ)用销售总额除以销售量得到机器的销售单价,可知第一类与第三类的机器销售单价为20万,
第一类有 台,第三类有 台,共有 台,随机选取 台有 种不同方法,
两台机器的利润率不同则每类各取一台有 种不同方法,设两台机器的利润率不同为事件 ,则 .
江苏通州市三余中学模考高频错题(选择题)
江苏通州市三余中学模考高频错题(选择题)171.下列哪一种元素构成的无机盐直接参与光合作用的过程 A.P B.N C.S D.Mo2.在细胞分化过程中,基因选择性表达的直接结果是A.合成不同的蛋白质B.合成不同的糖类C.细胞具有不同的功能D.细胞具有不同的DNA3.下列除哪种生物外,能将自然界的某些物质最终转化为氨的是A.根瘤菌B.圆褐固氮菌C.硝化细菌D.放线菌和蓝藻4.在细胞免疫和体液免疫过程中,最终消灭抗原的是A.效应B细胞或效应T细胞B.记忆细胞C.吞噬细胞D.抗体5.下列有关人体内蛋白质代谢过程的叙述,不正确的是A.在健康成年人体内,蛋白质的合成和分解是平衡的B.在健康人的尿液中,尿素的含量较高说明其食物结构中含较多的蛋白质C.蛋白质消化的最终产物是二氧化碳、水和尿素D.通过脱氨基作用生成的氨,必须转变成尿素才能排出体外6.某植物的基因型为Aa,自交所结的某粒种子中,其胚和胚乳的基因型不可能是A.Aa和AaaB.aa和AAaC.aa和aaaD.AA和 AAA7.噬菌体侵染细菌的实验,除证明DNA是遗传物质外,还可证明A.DNA能产生可遗传的变异B.DNA能控制蛋白质的合成,从而控制生物的性状C.DNA分子的载体是染色体D.DNA分子结构是双螺旋结构8.下图表示三种海蟹在其它环境条件一定时,实验条件下,不断改变海水盐度,它们血.液浓度的变化情况(已知海水的浓度约为O.5moI/L),下列描述正确的是①在较低浓度的海水中才能维持内环境相对稳定的是甲②无法判断③调节渗透压相对稳定能力最弱的是乙④维持内环境相对稳定能力最强的是丙A.①③④B.①③C.③④D.⑦,9.已获得了某种蛋白质的mRNA,通过利用这个mRNA分子获得目的基因,在下列获得目的基因的方法中,哪一种最可取A.超速离心法B.反转录法C.逆转录法D.鸟枪法10.在引进优良家畜(如牛、羊)时,一般引进雄性个体让其与本地的同种雌性个体杂交。
2021年通州区第三中学高三生物三模试卷及参考答案
2021年通州区第三中学高三生物三模试卷及参考答案一、选择题:本题共15小题,每小题2分,共30分。
每小题只有一个选项符合题目要求。
1. 构成生物体细胞的有机化合物是()A. 糖类、蛋白质、脂类、无机盐B. 糖类、蛋白质、脂类、核酸C. 糖类、蛋白质、脂类、水和无机盐D. 糖类、蛋白质、脂类、磷酸2. 下列关于中心法则的叙述,正确的是()A. 同一细胞中两种不同RNA的合成不能同时发生B.HIV病毒可在T淋巴细胞中发生逆转录过程C. 细胞进行基因表达时,都是转录结束后才进行翻译D. 转录产生的mRNA上的碱基序列都能编码氨基酸3. 对细胞核功能的阐述,最全面的是()A.细胞核控制着细胞的代谢和遗传B.细胞核是遗传信息库C.细胞核位于细胞的中心位置D.细胞核是遗传信息库,是细胞代谢和遗传的控制中心4. 细胞作为生命活动的基本单位,其结构和功能统一。
下列有关叙述正确的是()A. 在蛋白质合成旺盛的细胞中,核糖体的数目较多,核仁较小B. 哺乳动物成熟红细胞和精子的寿命都较短,他们的寿命短与结构没有关系C. 小肠绒毛上皮细胞内有大量的线粒体,与小肠的吸收功能有关D. 与人体的其他细胞相比,卵细胞的体积较大,相对表面积也大,有利于物质交换。
5. 人们对遗传物质本质的探索经历了一个复杂而漫长的过程。
从最初认为遗传物质是蛋白质到最终认定遗传物质主要是DNA,其中的探索过程非常耐人寻味。
下列有关说法错误的是()A. 格里菲斯的实验建立在艾弗里实验基础之上,证实了转化因子的存在B. 艾弗里的实验创造性的引入了DNA酶,说明开阔的思路与严谨的思维是成功的必备条件C. 赫尔希和蔡斯根据病毒的组成及独特的增殖方式完成了实验证明,充分体现了实验选材的重要性D. 证明烟草花叶病毒的遗传物质是RNA,是对遗传物质内涵的补充,体现了理论的发展和创新6. 下列属于大量元素的一组是()A.Ca、C、O、MnB.H、O、K、FeC.P、N、C、CuD.N、S、O、Mg7. 如图为内分泌腺及其分泌激素间的关系,其中“+”表示促进,“-”表示抑制。
2024届南通高三三模考试试卷
选择题:在进行高三三模考试时,以下哪项是考生应该提前准备好的?A. 考试当天的早餐B. 考试用的文具和准考证(正确答案)C. 考试后的庆祝计划D. 考试前的紧张情绪高三三模考试中,数学科目的考试时长通常为:A. 60分钟B. 90分钟C. 120分钟(正确答案)D. 150分钟下列哪项不是高三三模考试的目的?A. 检验学生的备考情况B. 帮助学生熟悉高考流程C. 提前决定学生的高考成绩(正确答案)D. 为学生提供调整备考策略的机会在高三三模考试的英语科目中,听力部分通常占总分的比例是:A. 10%B. 20%(正确答案)C. 30%D. 40%下列哪项行为有助于考生在高三三模考试中取得好成绩?A. 考前熬夜复习B. 保持良好的心态和作息习惯(正确答案)C. 考试时紧张焦虑D. 忽视错题,不做复习高三三模考试的物理科目中,以下哪项内容通常是必考的?A. 光学原理B. 力学原理(正确答案)C. 热学原理D. 原子物理(注:虽然原子物理也是物理的一部分,但相比力学,它不是每次考试都必考的内容)在高三三模考试的备考过程中,以下哪项是不建议的?A. 制定详细的复习计划B. 多做模拟试题C. 忽视基础知识,只攻难题(正确答案)D. 定期回顾和巩固已学知识高三三模考试的成绩对于学生来说,其重要性体现在:A. 只是一次模拟考试,没有实际意义B. 是检验学生备考效果和调整策略的重要依据(正确答案)C. 决定了学生是否能被心仪的大学录取D. 只需要关注总分,不需要分析各科成绩下列哪项是考生在高三三模考试后应该做的?A. 立即忘记考试内容,开始新的学习内容B. 仔细分析错题,找出知识盲点(正确答案)C. 和同学比较分数,互相攀比D. 忽视老师的讲评和建议。
江苏省南通市通州三余中学2022年高三数学理月考试题含解析
江苏省南通市通州三余中学2022年高三数学理月考试题含解析一、选择题:本大题共10小题,每小题5分,共50分。
在每小题给出的四个选项中,只有是一个符合题目要求的1. 若,则A. B. C. D.参考答案:【解析】:函数为增函数2. 抛物线C:的焦点为F,其准线l与y轴交于点A,点M在抛物线C上,当时,的面积为()A.1 B.2 C.D.4参考答案:B过M作, 垂足为N,则∴∴的高等于,设则的面积又由,三角形为等腰直角三角形,所以m=2 ,∴的面积2故选B. 3. 已知全集,集合则A. B. C.D.参考答案:C4. “<x<”是“不等式|x﹣1|<1成立”的()A.充分不必要条件B.必要不充分条件C.充分必要条件D.既不充分也不必要条件参考答案:A【考点】必要条件、充分条件与充要条件的判断.【分析】利用绝对值不等式的解法化简条件“不等式|x﹣1|<1成立”,判断出两个集合的包含关系,根据小范围成立大范围内就成立,判断出前者是后者的充分不必要条件.【解答】解:因为|x﹣1|<1?﹣1<x﹣1<1?0<x<2,因为{x|}?{x|0<x<2},所以“”是“不等式|x﹣1|<1成立”的充分不必要条件,故选A5. 设a,b是两个非零向量.则下列命题为真命题的是A.若|a+b|=|a|-|b|,则a⊥bB.若a⊥b,则|a+b|=|a|-|b|C.若|a+b|=|a|-|b|,则存在实数λ,使得a=λbD.若存在实数λ,使得a=λb,则|a+b|=|a|-|b|参考答案:C6. 在直三棱柱中,,D,E分别是和的中点,则直线DE与平面所在角为(A) (B) (C) (D)参考答案:A略7. 复数等于()A.0 B.C.D.参考答案:A略8. 已知集合, ,则A∩B=()A. {3}B.{-1,0,1,2,3}C. {0,1,2,3}D.参考答案:C9. 的值为A. B. C. D.参考答案:C10. 已知不等式,对任意恒成立,则a的取值范围为()A. B.C.(1,5) D.(2,5)参考答案:B二、填空题:本大题共7小题,每小题4分,共28分11. 设圆,直线,点,若存在点,使得为坐标原点),则的取值范围为________.参考答案:12. 某高校在某年的自主招生考试成绩中随机抽取50名学生的笔试成绩,绘制成频率分布直方图如图所示,若要从成绩在[85,90),[90,95),[95,100]三组内的学生中,用分层抽样的方法抽取12人参加面试,则成绩在[90,100]内的学生应抽取的人数为.参考答案:6【考点】频率分布直方图.【专题】概率与统计.【分析】由频率分布直方图,先求出a=0.040.再求出第3组、第4组和第5组的人数,由此能求出利用分层抽样在30名学生中抽取12名学生,成绩在[90,100]内的学生应抽取的人数.【解答】解:由频率分布直方图,得:(0.016+0.064+0.06+a+0.02)×5=1,解得a=0.040.第3组的人数为0.060×5×50=15,第4组的人数为0.040×5×50=10,第5组的人数为0.020×5×50=5,所以利用分层抽样在30名学生中抽取12名学生,第4组应抽取×12=4人,第5组应抽取×12=2人.则成绩在[90,100]内的学生应抽取的人数为6.故答案为:6.【点评】本题考查分层抽样方法的应用,是基础题,解题时要认真审题,注意频率分布直方图的合理运用.13. 由曲线以及x轴所围成的面积为 ______ .参考答案:14. 某一几何体的三视图如图所示,其中圆的半径都为1,则这该几何体的体积为.参考答案:15. 设,则。
通州区高三年级第三次模拟考试数学(理科)试卷含答案
通州区高三年级第三次模拟考试 数学(理科)试卷2019年5月第一部分(选择题 共40分)一、选择题共8小题,每小题5分,共40分.在每小题列出的四个选项中,选出符合题目要求的一项. (1)已知集合}2,1,0{=P ,{|2}Q x x =<,则Q P =(A )}0{ (B )}1,0{ (C )}2,1{ (D )}2,0{ (2)设复数2ii(,)1ia b a b =+∈-R ,则=+b a (A )0 (B )1 (C )2 (D )1- (3)执行如图所示的程序框图,输出的s 值为(A )34(B )78(C )1516 (D )74(4)三国时期著名的数学家刘徽对推导特殊数列的求和公式很感兴趣,创造并发展了许多算法,展现了聪明才智.他在《九章算术》“盈不足”章的第19题的注文中给出了一个特殊数列的求和公式.这个题的大意是:一匹良马和一匹驽马由长安出发至齐地,长安与齐地相距3000里(1里=500米),良马第一天走193里,以后每天比前一天多走13里.驽马第一天走97里,以后每天比前一天少走半里.良马先到齐地后,马上返回长安迎驽马,问两匹马在第几天相遇 (A )14天 (B )15天(C )16天 (D )17天(5)若不等式组1,10,20,x x ay x y ⎧⎪-+⎨⎪+-⎩………可表示为由直线围成的三角形区域(包括边界),则实数a 的范围是(A )()0,2(B )()2,+∞ (C )()1,2- (D )(),1-∞-(6)设,a b 均为单位向量,则“a 与b 夹角为2π3”是“||+=a b (A )充分而不必要条件 (B )必要而不充分条件 (C )充分必要条件(D )既不充分也不必要条件(7)在平面直角坐标系中,记曲线C 为点(2cos 1,2sin 1)P θθ-+的轨迹,直线20x ty -+=与曲线C 交于,A B 两点,则||AB 的最小值为(A )2 (B) (C) (D )4(8) 设函数2,,()=,.x e x a f x x x a x a ⎧⎪⎨-+>⎪⎩≤则下列结论中正确的是(A )对任意实数a ,函数()f x 的最小值为14a -(B )对任意实数a ,函数()f x 的最小值都不是14a - (C )当且仅当12a ≤时,函数()f x 的最小值为14a - (D )当且仅当14a ≤时,函数()f x 的最小值为14a - 第二部分(非选择题共110分)二、填空题共6小题,每小题5分,共30分.(9 )设{}n a 是等比数列,且245a a a =,427a =,则{}n a 的通项公式为 .(10)在极坐标系中,若点A 在圆C :=1ρ上,则点A 到直线l :()cos sin 2ρθθ+=距离的最大值为________.(11)已知函数sin y x =ω(0)>ω在(0,)4π上有最大值,没有最小值,则ω的取值范围为____.(12)某几何体的三视图如图所示,该几何体的体积是_________________正(主)视图侧(左)视图(13)能够说明“在某个区间(,)a b 内,如果函数()y f x =在这个区间内单调递增,那么()0f x '>恒成立”是假命题的一个函数是 .(写出函数表达式和区间) (14)如图所示,正方形ABCD 的边长为2,椭圆22122:1(0)x y C a b a b +=>>及双曲线22222:1(0,0)x y C m n m n-=>>均以正方形顶点,B D 为焦点且经过线段AB 的 中点E ,则椭圆1C 与双曲线2C 离心率之比为 .三、解答题共6小题,共80分.解答应写出文字说明,演算步骤或证明过程. (15)(本小题13分)在ABC △中,角,,A B C 的对边分别为,a,b c ,3a =,b =,cos 13B =-. (Ⅰ)求c 的值;(Ⅱ)若D 为BC 边上的点,并且43AD =,求ADB ∠.(16)(本小题14分)如图,在四棱柱1111ABCD A B C D -中,侧棱1A A ABCD ⊥底面,AB AC ⊥,1AB =,12,AC AA AD CD ===点E 为线段1AA 上的点,且12AE =.(Ⅰ)求证:BE ^平面1ACB ; (Ⅱ)求二面角11D AC B --的余弦值;(Ⅲ)判断棱11A B 上是否存在点F ,使得直线//DF 平面1ACB ?若存在,求线段1A F 的长;若不存在,说明理由.(17)(本小题13分)为调查某公司五类机器的销售情况,该公司随机收集了一个月销售的有关数据,公司规定同一类机器销售价格相同,经分类整理得到下表:(Ⅰ)从该公司本月卖出的机器中随机选一台,求这台机器利润率高于0.2的概率;(Ⅱ)从该公司本月卖出的销售单价为20万元的机器中随机选取2台,求这两台机器的利润率不同的概率; (Ⅲ)假设每类机器利润率不变,销售一台第一类机器获利1x 万元,销售一台第二类机器获利2x 万元,…,销售一台第五类机器获利5x ,依据上表统计数据,随机销售一台机器获利的期望为Ex ,设123455x x x x x x ++++=,试判断Ex 与x 的大小.(结论不要求证明) (18)(本小题13分)D 1设函数2(42)46()e xax a x a f x +-+-=.(Ⅰ)若曲线()y f x =在点(1,(1))f 处的切线与直线1y =平行,求a ; (Ⅱ)若()f x 在2x =-处取得极大值,求a 的取值范围.(19)(本小题13分)已知椭圆M :22221x y a b +=(0)a b >>的长轴长为6且经过点8(1,)3P ,过点P 并且倾斜角互补的两条直线12,l l 与椭圆M 的交点分别为,B C (点B 在点C 的左侧),点(7,0)E -. (Ⅰ)求椭圆M 的方程;(Ⅱ)求证:四边形PEBC 为梯形.(20)(本小题14分)设n 为正整数,集合{}12(,,,),{0,1},1,2,,n k A T T t t t t k n ==∈=.对于集合A 中的任意元素12(,,,)n X x x x =和12(,,,)n Y y y y =,记111122221(,)[(||||)(||||)(||||)]2n n n n d X Y x y x y x y x y x y x y =++-+++-++++-.(Ⅰ)当3n =时,若(1,1,0)X =,(0,1,1)Y =,求(,)d X X 和(,)d X Y 的值;(Ⅱ)当4n =时,设B 是A 的子集,且满足:对于B 中的任意元素,X Y ,当,X Y 相同时,(,)d X Y 是偶数;当,X Y不同时,(,)d X Y 是奇数.求集合B 中元素个数的最大值;(Ⅲ)给定不小于2的n ,设B 是A 的子集,且满足:对于B 中的任意两个不同的元素,X Y ,(,)d X Y n =.写出一个集合B ,使其元素个数最多,并说明理由.通州区高三年级第三次模拟考试数学(理科)试卷参考答案及评分标准 第一部分(选择题 共40分)第二部分(非选择题 共110分)二、填空题:本大题共6小题,每小题5分,共30分. 9.13n n a -=,*n ∈N 10111.2 6.ω<≤12.10313.3(),(1,1)f x x x =∈- (答案不唯一) 14.32- 三、解答题:本大题共6小题,共80分. 15.(共13分)解:(Ⅰ)由余弦定理可得:222cos 2a +c b B ac-=,即219123+c 6c--=, ………………3分整理得2230c +c -=,解得1c =或3c =-(舍). 所以1c =. ………………6分(Ⅱ)在ABD △中,由正弦定理sin sin AD AB BADB=∠,可得sin ADB =∠. ………………9分 又因为cos 103B =-<,所以π2B >. 2019.5所以π02ADB <<∠. 所以π4ADB=∠. ………………13分 16.(共14分)(Ⅰ)证明:因为1A A ABCD ⊥底面,所以1A A AC ⊥.又因为AB AC ⊥,所以AC ⊥平面11ABB A . ………………2分 又因为BE Ì平面11ABB A , 所以AC ⊥BE . ………………3分因为112AE ABAB BB ==,所以Rt ABE ∆∽所以1ABE AB B ∠=∠.因为1190BAB AB B ∠+∠=︒,190BAB ABE ∠+∠=︒. 所以BE ⊥1AB .又1AC AB A =,所以BE ^平面1ACB . (Ⅱ)解:如图,以A 111(0,0,0),(0,1,0),(2,0,0),(1,2,0),(0,0,2),(0,1,2),(2,0,2),A B C D A B C - 11(1,2,2),(0,0,)2D E -.由(Ⅰ)知, 1(0,1,)2EB =-为平面1ACB 的一个法向量,………………6分 设(,,)n x y z =为平面1ACD 的法向量. 因为1(1,2,2),(2,0,0)AD AC =-=,则10,0,n AD n AC ì?ïíï?î即220,20,x y z x ì-+=ïí=ïî不妨设1z =,可得(0,1,1)n =. ………………8分 因此10cos ,10||||n EB n EB n EB ×<>==. 因为二面角11D AC B --为锐角,所以二面角11-D AC B -的余弦值为10………………10分(Ⅲ)解:设1A F a =,则(0,,2)F a ,(1,2,2)DF a =-+.1(1,2,2)(0,1,)2102DF EB a a ?-+?=+-=, ………………12分 所以1a =-(舍).即直线DF 的方向向量与平面1ACB 的法向量不垂直, 所以,棱11A B 上不存在点F ,使直线//DF 平面1ACB. ………………14分17.(共13分) 解:(Ⅰ)由题意知,本月共卖出30台机器,利润率高于0.2的是第一类和第四类,共有10台. ………………3分 设“这台机器利润率高于0.2”为事件A , 则101()303P A ==. ………………5分 (Ⅱ)用销售总额除以销售量得到机器的销售单价,可知第一类与第三类的机器销售单价为20万,第一类有5台,第三类有10台共有15台,随机选取2台有215C 种不同方法,两台机器的利润率不同则每类各取一台有11510C C 种不同方法,设两台机器的利润率不同为事件B ,则1151021510()21C C P B C ==. ………………11分(Ⅲ)Ex x <. ………………13分 18.(共13分)解:(Ⅰ)因为2(42)46()e xax a x a f x +-+-=,所以22(242)e [(42)46]e ()e x xxax a ax a x a f x +--+-+-'=(2)(2)exax x -+=-. ………………2分 所以3(2)(1)ea f -'=-. 由题设知(1)0f '=,解得2a =. 此时10(1)1ef =≠. 所以a 的值为2. ………………5分 (Ⅱ)由(Ⅰ)得(2)(2)'()e xax x f x -+=-.(1)当1a <-时 令'()0f x =,则2x a =,或2x =-,并且22a>-.(2)当1a -≥时若(2,0)x ∈-,则20x +>,220ax x ---<≤,所以(2)(2)'()0e xax x f x -+=->.所以2-不是()f x 的极大值点. ………………12分 综上可知,a 的取值范围是(,1)-∞-. ………………13分19.(共14分)解:(Ⅰ)由已知有223,1641.9a a b =⎧⎪⎨+=⎪⎩解得23,8.a b =⎧⎨=⎩ 所以椭圆M 的方程为22198x y +=. ………………4分 (Ⅱ)证明:依题意,直线12,l l 的倾斜角均不为90,且直线12,l l 的斜率互为相反数.设直线PB 的方程为8(1)(0)3y k x k =-+>,由228(1),31.98y k x x y ⎧=-+⎪⎪⎨⎪+=⎪⎩消去y ,整理得2228(89)18()948803k x k k x k k ++-+--=. 当0∆>时,设1122(,),(,)B x y C x y ,则2129488189k k x k --⋅=+,即212948889k k x k --=+. ………………6分因为直线PC 过点P ,且斜率为-k , 所以直线PC 的方程为8(1)3y k x =--+. ………………7分 同理可得222948889k k x k +-=+. ………………9分所以直线BC 的斜率2121212188(1)(1)33BCk x k x y y k x x x x --+----==--21212232(2)18996389kk x x k k x x k-+-+===--+. ………………11分因为直线PE 的斜率80131(7)3PEBC k k -===--,所以//PE BC . ………………12分 又因为1(7)8PE >--=,26BC a <= ,所以PE BC ≠.所以四边形PEBC 为梯形. ………………14分20. (共13分)解:(Ⅰ)因为(1,1,0)X =,(0,1,1)Y =,所以1(,)[(|11||11|)(|11||11|)(|00||00|)]22d X X =++-+++-+++-=,1(,)[(|10||10|)(|11||11|)(|01||01|)]32d X Y =++-+++-+++-=.………………4分(Ⅱ)设1234(,,,)X x x x x B =∈,则1234(,)d X X x x x x =+++.由题意知1234,,,{0,1}x x x x ∈,且(,)d X X 为偶数,所以1234,,,x x x x 中1的个数为0或2或4.令C ={(0,0,0,0),(1,1,0,0),(1,0,1,0),(1,0,0,1),(0,1,1,0),(0,1,0,1),(0,0,1,1),(1,1,1,1)}, 所以B ⊆C .(1)当(0,0,0,0)X =,12(,,,)n Y y y y C =∈,且,X Y 不同时,经验证,(,)d X Y =2或4,与(,)d X Y 是奇数矛盾,所以(0,0,0,0)X B =∉.(2)当(1,1,1,1)X =,12(,,,)n Y y y y C =∈,且,X Y 不同时,经验证,(,)d X Y =4,与(,)d X Y 是奇数矛盾,所以(1,1,1,1)X B =∉.(3)将集合C 中剩余的元素分成如下四组:(1,1,0,0),(0,0,1,1);(1,0,1,0),(0,1,0,1);(1,0,0,1),(0,1,1,0).经验证,对于每组中两个元素,X Y ,均有(,)4d X Y =.所以每组中的两个元素不可能同时是集合B 的元素.所以集合B 中元素的个数不超过3.又集合{(1,1,0,0),(1,0,1,0),(1,0,0,1)}满足条件,所以集合B 中元素个数的最大值为3. ………………8分 (Ⅲ)设12(,,,)n X x x x =,12(,,,)n Y y y y =∈B ,则{0,1},{0,1},1,2,,.i i x y i n ∈∈= 设1[||||],1,2,,2i i i i i m x y x y i n =++-=. 当0i i x y ==时,1[||||]02i i i i i m x y x y =++-=; 当1i i x y ==时,1[||||]12i i i i i m x y x y =++-=; 当0,11,0i i i i x y x y ====或时,1[||||]12i i i i i m x y x y =++-=; 所以1,1,2,,.i m i n =≤所以1(,)ni i d X Y m n ==∑≤.又因为(,)d X Y n =,所以1i m =,1,2,,i n =.即对任意的i ,i x 与i y 不能同时为零.所以若集合B 中的某个的元素X 中的0i x =,i =1,2,⋯,n ,则其它任意元素Y 中的1i y =.因此,集合B 中至多有n +1个元素. 设12{(,,,,,)0,1,,1,2,,},1,2,,.k k n k m S x x x x x x m k m n k n ===≠==11212{(,,,)1}n n n S x x x x x x +=====, 令121n B S S S +=,则集合B 的元素个数为1n +,且满足条件. 故B 是一个满足条件且元素个数最多的集合. ………………13分 注:解答题学生若有其它解法,请酌情给分.。
2020届通州区第三中学高三英语三模试题及答案
2020届通州区第三中学高三英语三模试题及答案第一部分阅读(共两节,满分40分)第一节(共15小题;每小题2分,满分30分)阅读下列短文,从每题所给的A、B、C、D四个选项中选出最佳选项AOne day when I was 12, my mother gave me an order: I was to walk to the public library, and borrow at least one book for the summer. This was one more weapon for her to defeat my strange problem inability to read.In the library,I found my way into the "Children's Room." I sat down on the floor and pulled a few books off the shelf at random. The cover of a book caught my eye. It presented a picture of a beagle. I had recently had a beagle, the first and only animal companion I ever had as a child. He was my secret sharer, but one morning, he was gone, given away to someone who had the space and the money to care for him. I never forgot my beagle. Without opening the book—Amos, the Beagle with a Plan ,1 borrowed it from the library for the summer.Under the shade of a bush, I started to read about Amos. I read very, very slowly with difficulty. Though pages were turned slowly, I got the main idea of the story about a dog who, like mine, had been separated from his family and who finally found his way back home. That dog was my dog, and I was the little boy in the book. At the end of the story, my mind continued the final scene of reunion, on and on, until my own lost dog and I were, in my mind, running together.My mother's call returned me to the real world. I suddenly realized something: I had read a book, and I had loved reading that book.I never told my mother about my “miraculous” experience that summer, but she saw a slow but remarkable improvement in my classroom performance during the next year. And years later ,she was proud that her son had read thousands of books, was awarded a PhD in literature, and authored his own books, articles, poetry and fiction. The power of the words has held.1. The author's mother told him to borrow a book in order to ________.A. let him spend a meaningful summerB. encourage him to do more walkingC. help cure him of his reading problemD. make him learn more about weapons2. The book caught the author's eye because .A. it reminded him of his own dogB. he found its title easy to understandC. it contained pretty pictures of animalsD. he liked children's stories very much3. Which one could be the best title of the passage?A. Mum's Strict Order.B. My Passion forReading.C. Reunion with My Beagle.D. The Charm of a Book.BJack was 11 months old in the spring of 2015 when his parents, Erika and Christopher, recognized his development was not progressing as it should. The feeling was familiar to the couple. Just a few months earlier, Jack’s brother Chase, who is 16 months older, had been diagnosed with autism(自闭症) after he did not reach motion and language standards as expected.Jack’s behaviors were similarly delayed, and his parents moved quickly to seek help. Today, Jack is 5 — he celebrated his birthday on May 13 — and he can speak in full sentences and read. After two years at a preschool that specializes in services for children with developmental disabilities, he will start kindergarten in theSmithtownschool district in September. “Our family’s experience is a good example of the power and effectiveness of early intervention. The services our boys have received made all the difference,” the parents said.According to scientists, autism can be detected at 18 months or younger, and by age 2 a diagnosis can be considered “very reliable.” The parents said they were happy with Chase’s success at the learning center, but still had concerns for Jack because he was not speaking. Developing social and communication skills can be among the greatest challenge for individuals with autism, even if they are able to say a few words early on. “We didn’t know if he was ever going to talk,” Erika said. “That was my biggest fear. We just didn’t know.”Looking ahead, the parents are cautiously optimistic about Jack’s next educational move. He doesn’t handle change well, they said, and he likes to know his routine. Still, they expressed confidence that his time at the learning center has given him the skills he needs to be successful.4. How did Jack’s parents know he suffered from autism?A. They found the baby clever.B. They judged by their experience.C. They found he didn’t develop.D. They checked on him in the hospital.5. What did the parents think of the early intervention?A. It made no difference to the babies.B. It benefitted the babies greatly.C. It got their babies more disabled.D. It helped their babies speak fluently.6. What can we learn from the third paragraph?A. Autism can be confirmed at 18 months old.B. Jack’s parents were confident about his motor skills.C. Chase’s parents were doubtful about his developmentD. Jack’s parents worried about his language skills most.7. What is the text mainly talking about?A. Autism can be curedif parents take actions early.B. Parents should be confident about their children’s future.C. Early intervention in autism could improve children’s life.D. Communication skills should be developed as early as possible.CSam, I say to myself as I start across the bridge, you must stop these thoughts and start thinking about what to do now that you have lost your falcon, Frightful.Life, my friend Ban do once said, is meeting problems and solving them whether you are an amoeba or a space traveller. I have a problem. I have to provide my younger sister Alice and myself with meat. Fish, nuts, and vegetables are good and necessary, but they don't provide enough fuel for the hard physical work we do. Although we have venison now, I can't always count on getting it. So far this year, our venison has been only road kill from in front of Mrs Strawberry's farm.I decide to take the longest way home, down the flood plain of the West Branch of Delaware to Spillkill, my own name for a fast stream that cascades down the south face of the mountain range I'm on. I need time to think. Perhaps Alice and I should be like the early Eskimos. We should walk, camp and hunt, and when the seasons change, walk on to new food sources. But I love my tree and my mountaintop.Another solution would be to become farmers, like the people of the Iroquois Confederacy who once lived here. They settled in villages and planted corm and squash, bush beans and berries. We already grow groundnuts in the damp soil and squash in the poor land. But the Iroquois also hunted game. I can't do that anymore.I'm back where I started from.Slowly I climb the Spillkill. As I hop from rock to rock beneath shady basswoods and hemlocks, I hear the cry of the red-tailed hawk who nests on the mountain crest. I am reminded of Frightful and my heart aches. I can almost hear her call my name, Cree, Cree, Cree, Car-ree.Maybe I can get her back if I beg the man who is in charge of the peregrines at the university. “But it's the law,” he would say. I could write to the president of the United States and ask him to make an exception of Alice and me. That won't work. The president swore to uphold the Constitution and laws of the United States when he took office.I climb on. I must stop thinking about the impossible and solve the problem of what to do now. I must find anew way to provide for us. Frightful is going to be in good hands at the university, and she will have young.I smile at the thought of little Frightfuls and lift my reluctant feet.When I am far above the river, I take off my clothes and moccasins and bathe in a deep, clear pool until I am refreshed and thinking more clearly. Climbing up the bank, I dress and sit down. I breathe deeply of the mountain air and try to solve my problem more realistically.8. What does this excerpt main describe?A. Delicate mental activities.B. Unique story environment.C. Everchanging story events.D. Complicated character relationship.9. What is Sam's first worry?A. How to get back quicklyB. How to get enough venison.C. How to ensure the safety of Frightful.D. How to provide meat for Alice and himself.10. What do we know about Frightful?A. He left Sam and Alice due to lack of food.B. He helped Sam hunt before being taken away.C. He is living with the red-tailed hawk happily.D. He has given birth to babies in the university.11. Which of the following can best describe Sam?A. Humorous.B. Aggressive.C. Responsible.D. Unrealistic.DGuangzhououtbreak linked to strains inIndiaThe gene sequencing of the COVID-19 outbreak inGuangzhou.Guangdongprovince, indicates it is very similar in structure to the mutatedstrains detected inIndia, a senior health official from the city said on Sunday.“And it has the characteristic of quick spread.” Chen Bin, deputy director of the city's health commission, said at a news conference inGuangzhouon Sunday.She urged relevant departments and medical staff to act quickly to block the chain of infection and control the spread of the coronavirus in the southern metropolis.Zhang Zhoubin, deputy director of theGuangzhoucenter for disease control and prevention, said the strain of coronavirus spreads easily.“The virus can be spread through a meal or through a short period of indirect contact,” he said.The city reported five confirmed eases and 21 asymptomatic carriers as of 2 pm Sunday after the first con finned case was detected in the city's Liwan district on May 21, Chen said.To prevent the virus from spreading, the city government tightened its disease control and prevention measures over the weekend. Six communities and housing estates previously designated as low-risk areas were raised to medium-risk ones, Chen said.In addition to asking local residents to get vaccinated, the city has organized nucleic acid testing in Haizhu and Yuexiu districts starting from Sunday. Residents in specific areas of Tianhe, Baiyun and Panyu districts have also been required to take nucleic acid tests to expand the screening of suspected patients and asymptomatic carriers.Liwan previously required all its residents to take nucleic acid tests.As of Saturday, more than 2-25 million residents of the city have had samples collected for nucleic acid tests, Chen said. More than 10,000 medical workers from the entire city have been sent to Liwan to help vaccinate locals against COVID-19 and collect samples for nucleic acid testing.Deng Wenjun, director of circulation section with Guangzhou Supply and Marketing Cooperative, said there are sufficient supplies of food and daily necessities in the medium-risk areas.12. What is the characteristic of the COVID-19 which broke out inGuangzhou?A. It disappears quickly.B. It spreads fast.C. It has a lot to do with temperature.D. It has the same nature as the seasonal flu.13. Which district have residents who have not been required to take nucleic acid tests?A. Tianhe.B. Haizhu.C. Panyu.D. Zengcheng.14. Which of the following statements is TRUE?A. The virus can hardly be spread through a short period of indirect contact.B. There are 21 symptomatic carriers in the Liwan district as of 2 pm Sunday.C. All the people living in Liwan district arc previously asked to take nucleic acid tests.D. Supplies of food and daily necessities in the medium-risk areas arc still not enough.15. Where can you probably find this article?A. On a news website.B. In a fashion magazine.C. In a history book.D. In a travel journal.第二节(共5小题;每小题2分,满分10分)阅读下面短文,从短文后的选项中选出可以填入空白处的最佳选项。
2019-2020学年通州区第三中学高三生物三模试卷及答案
2019-2020学年通州区第三中学高三生物三模试卷及答案一、选择题:本题共15小题,每小题2分,共30分。
每小题只有一个选项符合题目要求。
1. 孟德尔遗传规律包括分离定律和自由组合定律。
下列相关叙述正确的是()A.自由组合定律是以分离定律为基础的B.分离定律不能用于分析两对等位基因的遗传C.自由组合定律也能用于分析一对等位基因的遗传D.基因的分离发生在配子形成的过程中,基因的自由组合发生在受精卵形成的过程中2. 下列实验操作中,会达到预期实验目的的是()A.用健那绿和吡罗红混合染色剂染色,可观察DNA和RNA在细胞中的分布B.将酶与底物在室温下混合,再做不同保温处理,可探究温度对酶活性的影响C.用新配制的NaOH与CuSO4混合液,水浴加热可检测待测样液中是否含有还原性糖D.用盐酸与酒精的混合液解离洋葱根尖,即可观察到有丝分裂不同时期的细胞3. 如图表示细胞核的结构,下列关于细胞核结构的说法,错误的是()A.②与②的膜成分很相似B.②能够将核内物质与细胞质分开C.②是细胞代谢和遗传的控制中心D.蛋白质合成旺盛的细胞中,②的数量较多4. 下列有关蛋白质的叙述正确的是()A.不同生物的蛋白质形成过程中,肽键的结构都相同B.有的蛋白质具有调节的作用,如血红蛋白C.鸡蛋清加盐,出现白色絮状物,蛋白质的结构发生了改变D.蛋白质多样性来自于其组成氨基酸的种类、数目、排列顺序和空间结构的多样性5. 已知豌豆的高茎对矮茎是显性,欲知一株高茎豌豆的遗传因子组成,最简便的办法是()A. 让它与另一株纯种高茎豌豆杂交B. 让它与另一株杂种高茎豌豆杂交C. 让它与另一株矮茎豌豆杂交D. 让它进行自花授粉6. 图1是人工合成的磷脂双分子示意图,图2是人的红细胞膜的部分示意图,图3中A为质量浓度为1 mol/L 的葡萄糖溶液,B为质量浓度为1 mol/L的乳酸溶液,用图1中人工膜作为半透膜。
下列说法正确的是()A.图1所示人工膜在水中磷脂分子排成双层的原因是磷脂分子有亲水的头部和疏水的尾部B.图2中,葡萄糖和乳酸可以跨膜运输,而有些分子不能通过,体现了膜的结构特点——选择透过性C.如果用图1所示人工膜作为图3中的半透膜,则液面不再变化时,左侧液面低于右侧液面D.某些药物大分子不容易被细胞吸收,但如果用图1所示人工膜包裹后再注射则更容易进入细胞,此实例可说明细胞膜具有选择透过性7. 如图是胡萝卜在不同的含氧情况下从硝酸钾溶液中吸收K+和NO3-的曲线。
2020年通州区第三中学高三生物三模试题及参考答案
2020年通州区第三中学高三生物三模试题及参考答案一、选择题:本题共15小题,每小题2分,共30分。
每小题只有一个选项符合题目要求。
1. 如图表示某神经元一个动作电位传导示意图,据图分析正确的是()A. 动作电位传导是局部电流触发邻近质膜依次产生新的负电波的过程B. 图中a→b→c的过程就是动作电位快速形成和恢复的过程C. 产生a段是由于K+经载体蛋白易化扩散外流造成的,不消耗ATPD. 若将该神经纤维置于更高浓度的Na+溶液中进行实验,d点将下移2. 下列有关内环境及其稳态的说法正确的是()A. 内环境是指细胞外液,包括血液、组织液和淋巴等B. 内环境稳态遭到破坏一定与外界环境的剧烈变化有关C. 人体在寒冷环境中产热增加、散热减少,从而维持体温的恒定D. 胰岛素的作用结果影响胰岛素分泌的过程属于反馈调节3. 将紫色萝卜的块根切成小块放入清水中,水的颜色无明显变化。
若对其进行加温,随着水温的升高,水的颜色会逐渐变红。
其原因是A.细胞壁在升温的过程中受到破坏B.水温升高,花青素的溶解度加大C.升温使生物膜被破坏而丧失功能D.升温使水中的化学物质发生了反应4. 如下图为细胞中化合物与化合物生成化合物D的过程示意图,C为化学键。
下列叙述中正确的是()A.A若为甘油、B为脂肪酸,则D中含有元素PB.A若为葡萄糖、B为果糖,则D为麦芽糖C.A若为甲硫氨酸、B为甘氨酸,则C可表示为CO-NHD.A若为腺苷,B为磷酸基团,则C不是高能磷酸键5. 在生命系统的结构层次中,既是细胞层次,也是个体层次的是A.精子B.病毒C.变形虫D.卵细胞6. 下列四种核苷酸中,不可能在RNA中找到的是()A. B.C. D.7. 关于植物细胞壁的叙述,错误的是()①主要成分是纤维素和果胶①具有支持、保护作用①具有选择透过性①不属于细胞结构.A. ①①B. ①①C. ①①D. ①①8. DNA复制、转录、翻译以及逆转录所需的原料依次是()A. 脱氧核苷酸、脱氧核苷酸、氨基酸、核糖核苷酸B. 脱氧核苷酸、核糖核苷酸、蛋白质、脱氧核苷酸C. 核糖核苷酸、脱氧核苷酸、氨基酸、脱氧核苷酸D. 脱氧核苷酸、核糖核苷酸、氨基酸、脱氧核苷酸9. 下图所示为真核细胞中发生的某些相关生理和生化反应过程,下列叙述正确的是()A. 结构a是核糖体,物质b是mRNA,过程①是基因的转录过程B. 过程①正在形成细胞中的某种结构,这一过程与细胞核中的核仁密切相关C. 如果细胞中r-蛋白含量较多,r-蛋白就与b结合,也促进b与a结合D. c是基因,是指导rRNA合成的直接模板,需要DNA聚合酶参与催化10. 下列关于检测生物组织中物质的实验,叙述正确的是()A.西瓜汁中含有较多的葡萄糖,可用斐林试剂进行检测B.用苏丹III检测花生油中的脂肪,颜色变化为橘黄色C.对斐林试剂乙液进行适当稀释后,利用斐林试剂甲、乙液可检测蛋白质D.检测脂肪实验中,需用体积分数为90%的酒精洗去浮色11. 下列关于科学家探究“DNA是遗传物质”实验的叙述,错误的是()A. 格里菲思实验中死亡小鼠体内均能分离出S型活细菌B. 艾弗里实验中S型细菌DNA的纯度会影响转化的效率C. 搅拌时间长短对35S、32P标记噬菌体侵染细菌实验结果影响不同D. 格里菲思、赫尔希和蔡斯均通过实验证明DNA是遗传物质12. 正确选择实验材料和方法是得出正确结论的前提,下列有关实验材料或方法的选择,正确的是()A. 利用废旧物品制作的真核细胞模型——概念模型B. 人鼠细胞融合实验研究生物膜的流动性——荧光标记法C. 提取并研究细胞膜的化学成分——公鸡的成熟红细胞D. 观察叶绿体和线粒体——人口腔上皮细胞13. 甲地因火山喷发被火山岩全部覆盖,乙地发生森林火灾导致原有植被消失,之后两地均发生了群落演替,下列关于甲、乙两地群落演替的叙述错误的是()A.若没有外力干扰,乙地可重现森林B.甲地和乙地发生的演替类型相同C.地衣会比苔藓更早地出现在甲地火山岩上D.甲、乙两地随着时间延长,物种丰富度逐渐增加14. 如图所示,图甲表示某酶促反应过程,图乙表示图甲的反应过程中有关物质浓度随时间变化的曲线。
2021年通州区第三中学高三英语三模试卷及答案解析
2021年通州区第三中学高三英语三模试卷及答案解析第一部分阅读(共两节,满分40分)第一节(共15小题;每小题2分,满分30分)阅读下列短文,从每题所给的A、B、C、D四个选项中选出最佳选项AIt's just before l pm and hungry guests are starting to emerge out onto the wooden floor at the back of the Victoria Falls Safari Lodge in Zimbabwe. A few have already settled in for lunch, drinking beer and enjoying their sandwiches and salads in the sunshine. It's a normal setting until you look up. Overhead, the sky is filled with several hundred vultures (秃鹭).They too have arrived for their midday snack. Every day the team at this hotel places last night's leftover meat out for the vultures to eat. They call it the "Vulture Restaurant" and it's a vital part of protecting these birds, who have become some of the most endangered species in Africa.In Zimbabwe, where illegal hunting of elephants and rhinos is a major issue, poisoning poses a significant threat to the birds. "In recent years hunters have realized they can use poison to kill animals. It's effective because it's silent and therefore doesn't attract much attention.when the vultures eat the bodies of the dead animals they die too," says Roger Parry, Wildlife Manager at the Victoria Falls Wildlife Trust.The Vulture Restaurant initiative is part feeding programme, part education programme. By attracting the birds to the Vulture Restaurant every day the team can ensure they're regularly getting a safe meal, and while the birds are there they can educate tourists from all over the world about these creatures.“Lunch” is served by Moses Garira. He has the unenviable task of wandering out into the middle of the clearing with a box full of meat, dropping the contents onto the ground and running for his life as the vultures fly downward suddenly for their food. No one, surely, would volunteer for this role, but Garira rather enjoys it. Back in the safety of the viewing seats, he tells the onlookers about the importance of vultures. "They're hugely important in terms of their role of cleaning up the bodies of dead animals," says Garira. "Notably, they're safely able to digest bacteria like anthrax. Without vultures, there'd be a lot more disease in the world."1. What's the biggest threat vultures facing in Zimbabwe?A. Overhunting.B. Unsafe food.C. Loss of habitat.D. A bird disease.2. What would others think of Garira's job?A. Scary.B. Relaxing.C. Well-paid.D. Time-consuming3. What do Garira's words mean?A. Birds are human's best friends.B. People know little about vultures.C. Vultures are environmentally favorable.D. Vultures are in urgentneed of protection.BA dog spentthe lastfour years of his life waitingat a crossroad in the Thai city ofKhon Kaenas if waiting for someone. People originally thought the dog had been abandoned, but then realized that he looked healthy, so people asked around about him. It turned out that the dog had indeed been spending most of his time around that crossroad, but a woman had been coming round regularly to bring him food and water.One day, while photographing the dog everyone called Leo, a reporter met the woman who had been taking care of him. She had come to drop off some food. After learning the story about the dog and the woman, the reporter decided to share the story on social media. The post soonwent viraland the photos of Leo got shared hundreds of times. And the photos reached the eyes of Leo’s former old owner.Nang Noi Sittisarn, a 64-year-old woman fromThailand’sRoiEtProvince, almost had a heart attack when her daughter showed her a photo of the beloved dog named BonBon she had lost during a car trip. When she learned that he had been waiting for her in the same spot for the last four years,her heart melted(融化).Auntie Noi told her daughter to drive her to where the dog was waiting. When she got there and called his name. BonBon,the poor dog started wiggling(扭动)his tailand came to her,but when she tried to take him home with her, he was unwilling to follow. She didn’ t want to force the dog to come with her so she agreed to leave him with his new master. However, she and her daughter will come to visit him regularly.4.Why did the dog look healthy after separation from his former owner?A. He walked around the crossroad constantly.B. He was kept at a woman’s home all the time.C. A local reporter brought him food and water.D. A woman looked after him on a regular basis.5. What does the underlined phrase “went viral” in paragraph 2 probably mean?A. Changed surprisingly.B. Spread quickly.C. Appeared gradually.D. Fell directly.6. How did Nang Noi Sittisam feel about the dog's waiting for her?A. Shocked.B. Regretful.C. Touched.D. Proud.7. What can we mainly learn from the story about the dog?A. Unbelievable success is worth waiting for.B. We should adjust ourselves to environments.C. We need to learn to be faithful and thankful.D. No one knows the result until the last minuteCPlastic is piling up in ecosystems all over the world. Although its harmful impacts on both species and ecosystems have been documented, a few animals—like bowerbirds and hermit crabs—are doing what they can to recycle it. And according to a recent study, wild bees in Canada have joined the effort, which is a rare observation of behavioral flexibility in species especially insects, in increasingly plastic-rich environments.The researchers found two species of leafcutter bees putting plastic into their nests. One of the bees they studied, the alfalfa leafcutter bee, normally bites off pieces of leaves and flowers while the second bee gathers sticky substances from trees. Leafcutter bees don't build big nests or store honey like honeybees, choosing instead small nests in underground holes, tree holes or cracks(裂缝)in buildings. But the researchers found that three of eight brood cells(育雏巢室)contained pieces of plastic bags, replacing 23 percent of the cut leaves in each cell on average.While they don't make honey,alfalfa leafcutter bees still make money for theU. S. and Canadian farmers by pollinating(给......传授花粉)crops including alfalfa , carrots and melons. The European insects were introduced to North America in the 1930s for that purpose, and they've since become wild, joining the continent's many native species of leafcutter bees.In a separate study conducted in Argentina between 2017 and 2018, researchers found a bee nest made entirely of plastic, which consisted of three separate cells. It's the first known example of such construction worldwide. Compared to the other nests the researchers examined, which were made of natural materials, this one had a pretty lower success rate of the bees' survival. One of the cells had a dead baby bee , another seemedto have housed an adult that had left the nest, and the third was unfinished.8. What does the animals' use of plastic show according to the study?A. How widely plastic is used.B. How strange the behavior of wildlife is.C. How some wildlife is adapting to plastic.D. How plastic pollution has harmed them.9. What do leaves mean to alfalfa leafcutter bees?A. Food.B. Shelter.C A plastic substitute. D. Traditional nest materials.10. Which is one characteristic of leafcutter bees?A. They have great economic value.B. They store honey like honeybees.C. They prefer to live in tree holes.D. They have evolved into a new species.11. What was the nest made entirely of plastic like?A. It might be warmer.B. It might be unhealthy.C. It might be easy to finish.D. It might be recyclable.DThe cumulative rainfall in Henan province during the four days was the highest since the province has records, the provincial meteorological service said. The rain was heaviest in the provincial capital, Zhengzhou, for a short period on Monday and Tuesday. Northern, western and central parts of Henan also experienced downpours, the service said. Zhengzhou's biggest one-hour precipitation (降水量) —201.9 mmbetween 4 and 5 pm on Tuesday—was also the highest on the Chinese mainland. The previous record was 198.5 mmin the village of Linzhuang in Zhumadian in August 1975, the National Meteorological Center said. The city's precipitation duringthe four days exceeded that of its average annual precipitation, the center said.Chen Tao, chief forecaster at the National Meteorological Center, said abundant water vapor (水蒸气) brought by Typhoon In-Fa and the province's special geographical features led to Henan's rain. “Partly affected by the typhoon, large amounts of water vapor have been transported to China's inland areas, including Henan,” he said.From Thursday to Monday, rain was forecast to continue in Henan. However, rainfall will gradually subside inZhengzhou and the province's northern and central regions, though the storms will increase the risk of mountain torrents and other geological disasters. By Monday, lighter rain is forecast for parts of Henan, the provincial weather service said. However, local authorities are still urged to bevigilantand prepare to prevent or cope with flooding and other possible disasters.Predicting such weather events remains a challenge worldwide because it involves many meteorological phenomena, the center said. “The formation of this kind of extreme weather, including rainstorms and high temperatures, is complex,” Chen said. “We still lack effective solutions and methods for such forecasting”, he said. “We are now putting a lot of effort into tackling the difficulty. We believe that as the technology improves, we can better forecast the events.”12. What message does the author mainly want to convey in the first paragraph?A. heavy rain fell in Zhengzhou.B. The rain in Henan lasted four days.C. Zhumadian also suffered the similar heavy rain.D. Henan experienced the biggest rainfall of all time.13. What can be indicated from Chen Tao's words?A. It is not easy to forecast the extreme weather.B The rain of Henan is mainly caused by Typhoon In-Fa.C. The center hasn't put a lot of effort into solving the problem.D. Rainstorms and high temperatures can account for the heavy rain.14. What does the underlined word “vigilant” probably mean?A. Relaxed.B. Alert.C. Reluctant.D. Communicative.15. Where might the text be most probably taken from?A. history book.B. A novel.C. A news report.D. A science magazine.第二节(共5小题;每小题2分,满分10分)阅读下面短文,从短文后的选项中选出可以填入空白处的最佳选项。
- 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)。
通州市三余中学高三第三次模拟考试数学试题(理科)注 意 事 项考生在答题前请认真阅读本注意事项及各题答题要求1.本试卷共4页,包含填空题(共14题)、解答题(共6题),满分160分,考试时间为120分钟。
2.答题前,请您务必将自己的姓名、考试证号用书写黑色字迹的0.5毫米签字笔填写在答题纸上。
3.请认真核对答题纸密封线内规定填写的项目是否准确。
4.作答试题必须用书写黑色字迹的0.5毫米签字笔写在答题纸上的指定位置,在其他位置作答一律无效.如有作图需要,可用2B 铅笔作答,并请加黑加粗,描写清楚。
一、填空题:本大题共14题,每小题5分,共70分,请将正确答案填写在答题纸的相应位置.1.已知集合}01211|{2<--=x x x A ,集合}),13(2|{Z n n x x B ∈+==,则B A ⋂等于 ▲ .2.函数)1(log 12)(2---=x x x f 的定义域为 ▲ .3.若函数3222)1()(----=m m x m m x f 是幂函数,且在),0(+∞∈x 上是减函数,则实数=m ▲ .4.设ax x f x21)13(log )(3++=是偶函数,则a 的值为▲ . 5.一几何体的三视图如下,它的体积为 ▲ .数2()lg 22f x x a x =⋅-+在区间(1,2)内有且只有一个零点,那么实数a 的取值范围是6.若函▲ .7.已知m 、α,是直线n 、β、γ是平面,给出下列命题:①若α⊥β,α∩β=m ,n ⊥m ,则n ⊥α或n ⊥β;②若α//β,α∩γ= m ,β∩γ= n ,则m//n ;③若m 不垂直于α,则m 不可能垂直于α内的无数条直线; ④若α∩β=m ,n//m 且n ⊄α,n ⊄β,则n//α且n//β. 其中所有正确命题的序号是 ▲ .8.已知命题p :函数)2(log 25.0a x x y ++=的值域为R.命题q :函数xa y )25(--= 是R 上的减函数.若p 或q 为真命题,p 且q 为假命题,则实数a 的取值范围是▲ .9.曲线249y x x =-+及直线3y x =+所围封闭区域的面积为 ▲ . 10.已知函数y=f(x)(x ∈R )满足f(x+1)=f(x —1),且x ∈[—1,1]时,f(x)=x 2,则y=f(x)与y=log 5x 的图象的交点个数为 ▲ . 11.定义在)()()()(),0(xy f y f x f x f =++∞满足的函数,且0)(1<>x f x 时,若不等式)()()(22a f xy f y x f +≤+对任意),0(,+∞∈y x 恒成立,则实数a 的取值范围 ▲ .12.点P 是曲线2ln y x x =-上任意一点,则点P 到直线2y x =-的最小距离为▲ .13.已知线段AB 在平面α外,A 、B 两点到平面α的距离分别为1和3,则线段AB 的中点到平面α的距离为 ▲ . 14.定义在R 上的函数)(x f ,给出下列四个命题:(1)若)(x f 是偶函数,则)3(+x f 的图象关于直线3=x 对称 (2)若),3()3(x f x f --=+则)(x f 的图象关于点)0,3(对称(3)若)3(+x f =)3(x f -,且)4()4(x f x f -=+,则)(x f 的一个周期为2。
(4))3(+=x f y 与)3(x f y -=的图象关于直线3=x 对称 其中正确命题的序号为 ▲ .二、解答题:本大题共6小题;共90分.解答应写出文字说明、证明过程或演算步骤. 15.(本小题满分14分)已知函数21(0)()21(1)x c cx x c f x c x -+<<⎧⎪=⎨⎪+<⎩≤满足29()8f c =.(1)求常数c 的值; (2)解不等式()18f x >+. 16.(本小题满分14分)如图为正方体ABCD-A 1B 1C 1D 1切去一个三棱锥B 1—A 1BC 1后得到的几何体. (1) 画出该几何体的正视图;(2) 若点O 为底面ABCD 的中心,求证:直线D 1O ∥平面A 1BC 1; (3). 求证:平面A 1BC 1⊥平面BD 1D . 17.(本小题满分14分) 如图,等腰梯形ABCD 的三边,,AB BC CD 分别与函数2122y x =-+,[]2,2x ∈-的图象切于点,,P Q R .求梯形ABCD 面积的最小值。
18.(本小题满分16分)已知函数()f x 和()g x 的图像关于原点对称,且2()2f x x x =+。
(1)求函数()g x 的解析式;(2)若()()()1h x g x f x λ=-+在[1,1]-上是增函数,求实数λ的取值范围。
19.(本小题满分16分)已知a 是实数,函数())f x x a -。
(Ⅰ)求函数()f x 的单调区间;(Ⅱ)设)(a g 为()f x 在区间[]2,0上的最小值。
(i )写出)(a g 的表达式;(ii )求a 的取值范围,使得2)(6-≤≤-a g 。
20.(本小题满分16分) 设a x tx x g x tx x x f 且,32)(,ln 321)(22++=+-=、b 为函数)0()(b a x f <<的极值点 (1)求t 的取值范围;(2)判断函数),()(a b x g --在区间上的单调性,并证明你的结论; (3)设函数 y=[]a b x g --,)(在区间上的最大值比最小值大32,讨论方程f(x)=m 解的状况(相同根算一根)。
通州市三余中学2009届高三第三次模拟考试数学试题(理科)参考答案及评分标准一、填空题:本大题共14题,每小题5分,共70分,请将正确答案填写在答题纸的相应位置.1.已知集合}01211|{2<--=x x x A ,集合}),13(2|{Z n n x x B ∈+==,则B A ⋂等于 ▲ .{2,8}2.函数)1(log 12)(2---=x x x f 的定义域为 ▲ .[)+∞,33.若函数3222)1()(----=m m x m m x f 是幂函数,且在),0(+∞∈x 上是减函数,则实数=m ▲ .m=24.设ax x f x21)13(log )(3++=是偶函数,则a 的值为▲ .21- 5.一几何体的三视图如下,它的体积为 ▲ .326.若函数2()lg 22f x x a x =⋅-+在区间(1,2)内有且只有一个零点,那么实数a 的取值范围是 ▲. 7.已知m 、α,是直线n 、β、γ是平面,给出下列命题:①若α⊥β,α∩β=m ,n ⊥m ,则n ⊥α或n ⊥β;②若α//β,α∩γ= m ,β∩γ= n ,则m//n ;③若m 不垂直于α,则m 不可能垂直于α内的无数条直线; ④若α∩β=m ,n//m 且n ⊄α,n ⊄β,则n//α且n//β. 其中所有正确命题的序号是 ▲ . ②④8.已知命题p :函数)2(log 25.0a x x y ++=的值域为R.命题q :函数xa y )25(--=是R 上的减函数.若p 或q 为真命题,p 且q 为假命题,则实数a 的取值范围是 ▲ .1<a <29.曲线249y x x =-+及直线3y x =+所围封闭区域的面积为 ▲ .6110.已知函数y=f(x)(x ∈R )满足f(x+1)=f(x —1),且x ∈[—1,1]时,f(x)=x 2,则y=f(x)与y=log 5x 的图象的交点个数为 ▲ .4 11.定义在)()()()(),0(xy f y f x f x f =++∞满足的函数,且0)(1<>x f x 时,若不等式)()()(22a f xy f y x f +≤+对任意),0(,+∞∈y x 恒成立,则实数a 的取值范围 ▲ .(]2,012.点P 是曲线2ln y x x =-上任意一点,则点P 到直线2y x =-的最小距离为▲.13.已知线段AB 在平面α外,A 、B 两点到平面α的距离分别为1和3,则线段AB 的中点到平面α的距离为 ▲ .1或2 14.定义在R 上的函数)(x f ,给出下列四个命题:(1)若)(x f 是偶函数,则)3(+x f 的图象关于直线3=x 对称 (2)若),3()3(x f x f --=+则)(x f 的图象关于点)0,3(对称(3)若)3(+x f =)3(x f -,且)4()4(x f x f -=+,则)(x f 的一个周期为2。
(4))3(+=x f y 与)3(x f y -=的图象关于直线3=x 对称 其中正确命题的序号为 ▲ .(2)(3)二、解答题:本大题共6小题;共90分.解答应写出文字说明、证明过程或演算步骤. 15.(本小题满分14分)已知函数21(0)()21(1)x c cx x c f x c x -+<<⎧⎪=⎨⎪+<⎩≤满足29()8f c =.(1)求常数c 的值; (2)解不等式()18f x >+. 解:(1)因为01c <<,所以2c c <;由29()8f c =,即3918c +=,12c =. (2)由(1)得411122()211x x x f x x -⎧⎛⎫+0<< ⎪⎪⎪⎝⎭=⎨1⎛⎫⎪+< ⎪⎪2⎝⎭⎩,,≤由()18f x >+得,当102x <<时,解得142x <<, 当112x <≤时,解得1528x <≤,所以()1f x >+的解集为58x ⎧⎫⎪⎪<<⎨⎬⎪⎪⎩⎭. 16.(本小题满分14分)如图为正方体ABCD-A 1B 1C 1D 1切去一个三棱锥B 1—A 1BC 1后得到的几何体. (1) 画出该几何体的正视图;(2) 若点O 为底面ABCD 的中心,求证:直线D 1O ∥平面A 1BC 1; (3). 求证:平面A 1BC 1⊥平面BD 1D .解:(1)该几何体的正视图为:-------------------------------------------------------3分(2)将其补成正方体ABCD-A 1B 1C 1D 1,设B 1D 1和A 1C 1交于点O 1,连接O 1B ,依题意可知,D 1O 1∥OB ,且D 1O 1=OB ,即四边形D 1OB O 1为平行四边形,--6分则D 1O ∥O 1B ,因为BO 1⊂平面BA 1C 1,D 1O ⊄平面BA 1C 1,所以有直线D 1O ∥平面BA 1C 1;-------------------------------------------------------8分(3)在正方体ABCD-A 1B 1C 1D 1中,DD 1⊥平面A 1B 1C 1D 1,则DD 1⊥A 1C 1,---------------------------------------------------10分另一方面,B 1D 1⊥A 1C 1,---------------------------------------------------------12分 又∵DD 1∩B 1D 1= D 1,∴A 1C 1⊥平面BD 1D ,∵A 1C 1⊂平面A 1BC 1,则平面A 1BC 1⊥平面BD 1D .-------------------14分17.(本小题满分14分) 2122y x =-+,[]2,2x ∈-的如图,等腰梯形ABCD 的三边,,AB BC CD 分别与函数图象切于点,,P Q R .求梯形ABCD 面积的最小值。