河南省新乡市河南师大附中、河南师大附属实验中学名校联考2020-2021学年七年级上学期期末英语试题

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2020-2021学年河南省新乡市名校联考九年级(上)期中物理试卷(Word+答案)

2020-2021学年河南省新乡市名校联考九年级（上）期中物理试卷一、填空题（每空1分，共14分）1．（4分）新冠疫情发生后，N95口罩供不应求。

其中一层为多孔结构的熔喷布，能过滤直径仅0.3μm的颗粒物，原因是在生产过程中通过某种手段使熔喷布得到大量电子而带（选填“正”或“负”）电，从而具有的性质。

由于熔喷布有很好的性，能长时间保留静电。

同学们回到刚刚消毒过的教室里就能闻到很浓的酒精味，这属于现象。

2．（2分）2020年6月23日，长征三号运载火箭把北斗三号最后一颗全球组网卫星送入预定轨道。

在火箭携卫星加速升空阶段，卫星的动能，机械能。

（选填“变大”、“不变”或“变小”）3．（2分）扣动步枪扳机，射出一颗子弹。

弹壳内火药燃烧将能转化为燃气的内能，燃气推动子弹在枪膛中运动，该过程相当于内燃机的冲程。

4．（2分）如图所示为某同学组装的串联电路。

闭合开关后发现两灯均不发光。

于是在老师的帮助下，他用导线分别连接a、b和b、c。

连接a、b时，两灯仍不发光，连接b、c时，L1很亮，则故障的原因可能为，撤去检测所用导线，在a、b间接入电压表，则电压表示数为（选填“0V”或“接近电源电压”）。

5．（2分）如图是电阻A和B的I﹣U图象。

若把二者并联后接入电路中，当通过电阻B的电流是0.2A时，通过电阻A的电流是A；若把二者串联后接入某电路，当通过电阻A的电流为0.3A，电阻B两端的电压是V。

6．（2分）如图所示，若甲乙两表均为电压表，当开关S闭合时，两表读数之比为U甲：U乙＝4：1，则R1：R2＝；若甲乙两表均为电流表，当开关S断开时，通过两电表的电流之比I甲：I乙＝。

二、选择题（本题8个小题，共16分，第13-14题，有两个选项符合题目要求）7．（2分）用冷水冷却汽车发动机，主要是利用水的（）A．比热容大B．密度大C．凝固点低D．沸点高8．（2分）下列实例中，通过做功改变内能的是（）A．盛夏时，吃雪糕解暑B．搓手时，手感到热C．天冷时，用热水袋取暖D．发烧时，用湿毛巾给头部降温9．（2分）下列关于热值和热机效率的说法，正确的是（）A．使燃料燃烧更充分，可以增大热值B．使燃料燃烧更充分，可以提高热机效率C．柴油机的热机效率通常为100%D．燃料燃烧释放的热量越大，热值越大10．（2分）高空中形成的雨滴在重力和空气阻力的共同作用下，开始下落的一段时间速度越来越大，落到地面前一段时间匀速下落。

河南省新乡市河南师范大学附属中学联考2024-2025学年九年级上学期11月期中数学试题

河南省新乡市河南师范大学附属中学联考2024-2025学年九年级上学期11月期中数学试题一、单选题1．下列图形中，既是轴对称图形，又是中心对称图形的是（）A ．B ．C ．D ．2．已知O 的半径为5，圆心O 到直线l 的距离为4，则直线l 与O 的位置关系是（）A ．相交B ．相切C ．相离D ．无法确定3．一元二次方程2430x x -+=经过配方变形为2(2)x k -=，则k 的值是（）A ．3-B ．7-C ．1D ．74．如图，、、A B C 为圆O 上的三点，78AOB ∠=︒，则ACB ∠的度数是（）A ．35︒B ．36︒C ．37︒D ．39︒5．关于二次函数()219y x =+-，下列说法正确的是（）A ．图象的对称轴在y 轴的右侧B ．图象的顶点坐标为()1,9-C ．与x 轴交于点()2,0-和()4,0D ．当1x <-时，y 随着x 的增大而减小6．如图，△ODC 是由△OAB 绕点O 顺时针旋转40°后得到的图形，若点D 恰好落在AB 上，且∠AOC ＝105°，则∠C 的度数是（）A ．55°B ．45°C ．42°D ．40°7．若关于x 的一元二次方程20x x k +-=有两个实数根，则k 的取值范围是（）A ．14k >-B ．14k ≥-C ．14k <-D ．14k ≤-8．如图，已知⊙O 的半径为5，弦AB 的长为8，P 是AB 的延长线上一点，BP ＝2，则OP 等于（）A ．B ．C ．D ．9．已知二次函数22y mx mx =-（m 为常数），当12x -≤≤时，函数值y 的最小值为2-，则m 的值是（）A ．2-或23B ．2-或32C ．2或23-D ．2或32-10．如图1，动点P 从菱形ABCD 的点A 出发，沿边AB BC →匀速运动，运动到点C 时停止．设点P 的运动路程为x ，PO 的长为y ，y 与x 的函数图象如图2所示，当点P 运动到BC 中点时，PO 的长为（）A ．2B ．3CD ．二、填空题11．把抛物线2y x =先向右平移1个单位再向上平移1个单位，所得到抛物线的解析式为．12．某种植物的主干长出若干个分支，每个支干又长出同样个数的小分支，主干、支干、小分支的总数是241，设每个支干长出小分支的个数是x ，则可列方程为．13．如图，在ABC 中，1310AB AC BC ===，，以A 为直径的O 交BC 于点D ，O 的切线D 交AC 于点E ，则D 的长为．14．汽车刹车后行驶的距离s 与行驶时间t 的函数关系是2156s t t =-，汽车从刹车到停下来所用时间是．15．如图，在Rt ABC △中，90,2ACB CA CB ∠=︒==，线段CD 绕点C 在平面内旋转，过点B 作AD 的垂线，交射线AD 于点E ．若1CD =，则AE 的最小值为．三、解答题16．计算：(1)2870x x -+=(2)()()221221x x +=+17．如图，在方格纸中，A 、B 、P 是三个格点（网格线的交点叫做格点）．(1)请用无刻度直尺作图：过点P 画A 的垂线，垂足为点C ；(2)在（1）的条件下，画出PBC △绕点P 旋转180︒后的图形PB C '' ，并写出C '的坐标．18．如图，在四边形ABCD 中，90A C ∠=∠=︒．(1)作图：请用无刻度直尺和圆规作O ，使得O 经过点A 、B 、D 三点；(2)判断O 是否经过点C ?请说明理由．19．小明爸爸经营的水果店出售一种优质热带水果，正在上初三的小明发现这种水果每月的销售量y （千克）与销售单价x （元）之间存在着一次函数关系：10500y x =-+．已知这种水果的进价是每千克20元．请解决下列问题：(1)如果每月这种水果的利润为2000元，那么销售单价应定为多少元？(2)当销售单价为多少元时，每月可获得最大利润？最大利润是多少元？20．牂牁江“佘月郎山，西陵晚渡”的风景描绘中有半个月亮挂在山上，月亮之上有个“齐天大圣”守护洞口的传说．真实情况是老王山上有个月亮洞，洞顶上经常有猴子爬来爬去，下图是月亮洞的截面示意图．(1)科考队测量出月亮洞的洞宽CD 约是28m ，洞高AB 约是12m ，通过计算截面所在圆的半径可以解释月亮洞像半个月亮，求半径OC 的长（结果精确到0.1m ）；(2)若162COD ∠=︒，点M 在 CD 上，求CMD ∠的度数，并用数学知识解释为什么“齐天大圣”点M 在洞顶 CD上巡视时总能看清洞口CD 的情况．21．已知抛物线2()1y x h =--．(1)当1x ≤时，y 随着x 的增大而减小，求h 的最小值；(2)已知A 、B 两点在x 轴上，A 点坐标为()3,0，B 点坐标为()5,0，若抛物线与线段AB 只有一个公共点，求h 的取值范围．22．如图，一小球M 从斜坡OA 上的O 点处抛出，球的抛出路线是抛物线的一部分，建立如图所示的平面直角坐标系，斜坡可以用一次函数13y x =刻画．若小球到达的最高的点坐标为（6，12），解答下列问题：（1）求抛物线的表达式；（2）在斜坡OA 上的B 点有一棵树，B 点的横坐标为3，树高为7，小球M 能否飞过这棵树？通过计算说明理由；（3）求小球M 在飞行的过程中离斜坡OA 的最大高度．23．在ABC V 中，90C ∠=︒，AC BC >，D 是AB 的中点．E 是直线AC 上一动点，连接DE ．过点D 作⊥DF DE ，交直线BC 于点F ，连接EF ．(1)如图1，当E 是线段AC 的中点时，则线段AE EF BF ，，之间的数量关系为________．(2)如图2，当点E 在线段AC 上时，用等式表示线段AE EF BF ，，之间的数量关系，并证明．(3)若6,8,3BC AC AE ===．请直接写出线段BF 的长．。

河南省新乡市河南师大附中实验学校2020—2021学年七年级下学期数学5.1相交线测试卷(答案解析)

一、选择题（本大题共10小题，共30.0分）1.如图所示，下列说法不正确的是()A. 线段BD是点B到AD的垂线段B. 线段AD是点D到BC的垂线段C. 点C到AB的垂线段是线段ACD. 点B到AC的垂线段是线段AB2.如图，直线a，b被c所截，则∠1与∠2是()A. 同位角B. 内错角C. 同旁内角D. 邻补角3.如图：在图中∠BAO和∠AOC是一对()A. 内错角B. 同旁内角C. 同位角D. 对顶角4.在如图图形中，线段PQ能表示点P到直线L的距离的是()A. B.C. D.5.如图，OA⊥OB，∠BOC=50°，OD平分∠AOC，则∠BOD的度数为()A. 20°B. 30°C. 40°D. 50°6.下列说法正确的是()A. 大小相等的两个角互为对顶角B. 有公共顶点且相等的两个角是对顶角C. 两角之和为180°，则这两个角互为邻补角D. 一个角的邻补角可能是锐角、钝角或直角7.下列说法中，正确的有()①两条直线相交，交点叫做垂足；②在同一平面内，过一点有且只有一条直线与已知直线垂直；③在同一平面内，一条直线有且只有一条垂线；④在同一平面内，一条线段有无数条垂线；⑤过一点不能向一条射线或线段所在的直线作垂线；⑥若l1⊥l2，则l1是l2的垂线，l2不是l1的垂线．A. 2个B. 3个C. 4个D. 5个8.如图，三条直线l1，l2，l3相交于点O，则∠1+∠2+∠3=()A. 180°B. 150°C. 120°D. 90°9.点P为直线m外一点，点A，B，C为直线m上三点，PA=4cm，PB=5cm，PC=6cm，则点P到直线m的距离()A. 等于5cmB. 等于4cmC. 小于4cmD. 不大于4cm10.如图，直线AD，BE被直线BF和AC所截，则∠1的同位角和∠5的内错角分别是()A. ∠4，∠2B. ∠2，∠6C. ∠5，∠4D. ∠2，∠4二、填空题（本大题共5小题，共15.0分）11.如图，直线AB，CD相交于O，若∠EOC；∠EOD=4：5，OA平分∠EOC，则∠BOE=______．12.如图，有下列3个结论：①能与∠DEF构成内错角的角的个数是2；②能与∠EFB构成同位角的角的个数是1；③能与∠C构成同旁内角的角的个数是4，以上结论正确的是______．13.如图，直线AB，CD相交于点O，射线OM平分∠AOC，ON⊥OM，若∠AOM=35°，则∠CON的度数为______．14.如图，在同一平面内，OA⊥l，OB⊥l，垂足为O，则OA与OB重合的理由是．15.如图，直线a，b，c两两相交，∠1=80°，∠2=2∠3，则∠4=°．三、解答题（本大题共7小题，共55.0分）16.复杂的数学问题我们常会把它分解为基本问题来研究，化繁为简，化整为零这是一种常见的数学解题思想．(1)如图1，直线l1，l2被直线l3所截，在这个基本图形中，形成了______对同旁内角．(2)如图2，平面内三条直线l1，l2，l3两两相交，交点分别为A、B、C，图中一共有______对同旁内角．(3)平面内四条直线两两相交，最多可以形成______对同旁内角．(4)平面内n条直线两两相交，最多可以形成______对同旁内角．17.画图并回答：(1)如图，点P在∠AOC的边OA上．①过点P画OA的垂线交OC于B；②画点P到OB的垂线段PM交OB于M；(2)指出上述所作图中哪一条线段的长度表示点P到OB的距离；(3)指出所作图中与∠O互余的角(可以表示出来的角)．18.如图，直线AE与CD相交于点B，射线BF平分∠ABC，射线BG在∠ABD内．(1)若∠DBE的补角是它的余角的3倍，求∠DBE的度数;(2)在(1)的条件下，若∠DBG=∠ABG−33∘，求∠ABG的度数;(3)若∠FBG=100∘，求∠ABG和∠DBG的度数的差．19.如图，直线AB、CD相交于点O，OM⊥AB．(1)若∠1=∠2，求∠NOD的度数；∠BOC，求∠AOC和∠MOD的度数．(2)若∠1=1320.如图，直线CD与∠AOB的边OB相交．(1)写出图中的同位角、内错角和同旁内角；(2)如果∠1=∠2，那么∠1与∠4相等吗？∠1与∠5互补吗？为什么？21.如图，直线EF与AB交于点M，与CD交于点O，OG平分∠DOF，若∠COM=120°，∠COF．∠EMB=12(1)求∠FOG的度数．(2)写出一个与∠FOG互为同位角的角．(3)求∠AMO的度数．22.如图，直线AB，CD相交于点O，OA平分∠EOC．(1)若∠EOC=70∘，求∠BOD的度数;(2)若∠EOC:∠EOD=2:3，求∠BOD的度数．答案和解析1.【答案】B【解析】【分析】本题考查了点到直线的距离，利用点到直线的距离的意义是解题关键．根据点到直线的距离的意义，可得答案．【解答】解：A、线段BD是点B到AD的垂线段，故A正确；B、线段AD是点A到BC的垂线段，故B错误；C、点C到AB的垂线段是线段AC，故C正确；D、点B到AC的垂线段是线段AB，故D正确；故选：B．2.【答案】B【解析】解：两条直线a、b被直线c所截形成的角中，∠1与∠2都在a、b直线的之间，并且在直线c的两旁，所以∠1与∠2是内错角．故选：B．由内错角的定义(两条直线被第三条直线所截形成的角中，若两个角都在两直线的之间，并且在第三条直线(截线)的两旁，则这样一对角叫做内错角)进行解答．本题考查了同位角，内错角以及同旁内角．解答此类题确定三线八角是关键，可直接从截线入手．对平面几何中概念的理解，一定要紧扣概念中的关键词语，要做到对它们正确理解，对不同的几何语言的表达要注意理解它们所包含的意义．3.【答案】A【解析】解：如图，∠BAO和∠AOC是由AB，OC被AO所截而成的内错角，故选：A．两条直线被第三条直线所截形成的角中，若两个角都在两直线的之间，并且在第三条直线(截线)的两旁，则这样一对角叫做内错角．本题主要考查了内错角的识别，解题时注意：同位角的边构成“F“形，内错角的边构成“Z“形，同旁内角的边构成“U”形．4.【答案】D【解析】【分析】本题考查了点到直线的距离的概念，关键是根据直线外一点到这条直线的垂线段的长度，叫做点到直线的距离的概念解答．根据直线外一点到这条直线的垂线段的长度，叫做点到直线的距离的概念判断．【解答】解：图A、B、C中，线段PQ不与直线L垂直，故线段PQ不能表示点P到直线L的距离；图D中，线段PQ与直线L垂直，垂足为点Q，故线段PQ能表示点P到直线L的距离；故选：D．5.【答案】A【解析】【分析】本题考查了角平分线的定义，利用角的和差关系求角的度数是解题关键．根据OA⊥OB可得∠AOB，结合∠BOC=50°，由角的和差得∠AOC的度数，然后根据角平分线的定义求出∠COD的度数，最后根据角的和差求出∠BOD的度数．【解答】解：∵OA⊥OB，∴∠AOB=90°．∵∠BOC=50°，∠AOC=∠AOB+∠BOC，∴∠AOC=50°+90°=140°．∵OD平分∠AOC，∴∠COD=12∠AOC=12×140°=70°，∴∠BOD=∠COD−∠BOC=70°−50°=20°．故选A．6.【答案】D【分析】此题主要考查对顶角和邻补角的概念，根据其意义分别进行分析判断即可得到答案．【解答】解：A.大小相等的两个角不一定是对顶角，故A错误B.有公共顶点且相等的两个角不一定是对顶角，故B错误；C.两角之和为180°，则这两个角互为补角，故C错误；D.一个角的邻补角可能是锐角、钝角或直角，故D正确．故选D．7.【答案】A【解析】【分析】本题主要考查的是垂线的定义及其性质，掌握垂线的定义及性质是解题的关键.依据垂线段的定义及其性质回答即可．【解答】解：①两条直线相交的交点不一定是垂足，错误；②正确：③在同一平面内，一条直线有无数条垂线，错误；④线段的垂线是指线段所在直线的垂线，有无数条，正确；⑤过一点能向一条射线或线段所在的直线作垂线，错误；⑥l2也是l1的垂线，错误．故选A．8.【答案】A【解析】略9.【答案】D【解析】略10.【答案】B【解析】此题主要考查了同位角和内错角的概念，能根据图形准确找出各对角是解题关键．根据同位角：两条直线被第三条直线所截形成的角中，若两个角都在两直线的同侧，并且在第三条直线(截线)的同旁，则这样一对角叫做同位角进行分析即可．根据内错角：两条直线被第三条直线所截形成的角中，夹在两条被截直线之间，并且在第三条直线(截线)的两旁，则这样一对角叫做内错角进行分析即可．【解答】解：∠1的同位角是∠2，∠5的内错角是∠6，故选B．11.【答案】140°【解析】解：∵∠EOC：∠EOD=4：5，∴设∠EOC=4x，∠EOD=5x，故4x+5x=180°，解得：x=20°，可得：∠COE=80°，∠EOD=100°，∵OA平分∠EOC，∴∠COA=∠AOE=40°，∴∠BOE=180°−∠AOE=140°．故答案为：140°直接利用平角的定义得出：∠COE=80°，∠EOD=100°，进而结合角平分线的定义得出∠AOC=∠BOD，进而得出答案．此题主要考查了角平分线的定义以及邻补角，正确把握相关定义是解题关键12.【答案】①②【解析】解：①能与∠DEF构成内错角的角的个数有2个，即∠EFA和∠EDC，故正确；②能与∠EFB构成同位角的角的个数只有1个：即∠FAE，故正确；③能与∠C构成同旁内角的角的个数有5个：即∠CDE，∠B，∠CED，∠CEF，∠A，故错误；所以结论正确的是①②．故答案为：①②．根据同位角、内错角、同旁内角的定义判断．本题主要考查了同位角、内错角、同旁内角，解题的关键是熟记相关的定义．13.【答案】55°【解析】【分析】本题考查了垂线及角平分线，掌握垂线及角平分线的定义是解题关键．根据角平分线的定义，可得∠COM，根据余角的定义，可得答案．【解答】解：由题意，得∠COM=∠AOM=35°．由ON⊥OM，得∠CON=∠MON−∠COM=90°−35°=55°，故答案为：55°．14.【答案】同一平面内，过一点有且只有一条直线与已知直线垂直【解析】略15.【答案】140【解析】解：∵∠1与∠2是对顶角，∴∠1=∠2=80°，又已知∠2=2∠3，∴∠3=40°．∵∠4与∠3互为邻补角，∴∠4=180°−∠3=180°−40°=140°．两直线相交，对顶角相等，即∠1=∠2，结合已知∠2=2∠3，即可求∠3的度数，又∠4与∠3互为邻补角，即∠4+∠3=180°，将∠3的度数代入，可求∠4．本题考查对顶角的性质以及邻补角的定义，是一个需要熟记的内容．16.【答案】2 6 24 n(n−1)(n−2)【解析】解：(1)直线l1，l2被直线l3所截，在这个基本图形中，形成了2对同旁内角．(2)平面内三条直线l1，l2，l3两两相交，交点分别为A、B、C，图中一共有6对同旁内角．(3)平面内四条直线两两相交，最多可以形成24对同旁内角．(4)平面内n条直线两两相交，最多可以形成n(n−1)(n−2)对同旁内角故答案为：(1)2；(2)6；(3)24；(4)n(n−1)(n−2)根据同旁内角的定义，结合图形确定同旁内角的对数．此题考查同旁内角问题，本题是规律总结的问题，应运用数形结合的思想求解．17.【答案】解：(1)如图所示，(2)图中PM的长度表示点P到OB的距离．(3)∠O+∠OPM=90°，∠O+∠OBP=90°，故所作图中与∠O互余的角为∠OPM，∠OBP．【解析】本题考查的是尺规作图，涉及画垂线，点到直线的距离以及余角的定义．(1)按照过直线上一点和直线外一点作已知直线的垂线的作法，按要求作图；(2)根据点到直线的距离的定义，可得PM的长表示P点到OB边的距离；(3)根据余角的定义，即可得到答案．18.【答案】解：(1)设∠DBE=α，则∠DBE的补角是180∘−α，它的余角是90∘−α，依题意，得180∘−α=3(90∘−α)，解得α=45∘，所以∠DBE的度数为45∘．(2)由(1)可知∠ABG+∠DBG=135∘，又因为∠DBG=∠ABG−33∘，所以∠ABG的度数为84∘．(3)因为射线BF平分∠ABC，所以可设∠ABF=∠CBF=β．又因为∠FBG=100∘，所以∠ABG=100∘−β，∠DBG=180∘−100∘−β=80∘−β，所以∠ABG−∠DBG=(100∘−β)−(80∘−β)=20∘，即∠ABG和∠DBG的度数的差为20∘．【解析】本题考查对顶角，邻补角，角平分线的定义与余角与补角的意义．(1)设∠DBE=α，则∠DBE的补角是180°−α，它的余角是90°−α，依据∠DBE的补角是它的余角的3倍，即可得到方程，求得∠DBE的度数；(2)依题意可得到关于∠ABG与∠DBG的关系式，即可得到∠ABG的度数；(3)可设∠ABF=∠CBF=β，依据∠FBG=100°，即可得到∠ABG=100°−β，∠DBG= 180°−100°−β=80°−β，依据∠ABG−∠DBG=(100°−β)−(80°−β)=20°，可得∠ABG和∠DBG的度数的差为20°．19.【答案】解：(1)∵OM⊥AB，∴∠AOM=∠1+∠AOC=90°，∵∠1=∠2，∴∠NOC=∠2+∠AOC=90°，∴∠NOD=180°−∠NOC=180°−90°=90°；(2)∵OM⊥AB，∴∠AOM=∠BOM=90°，∠BOC，∵∠1=13∴∠BOC=∠1+90°=3∠1，解得∠1=45°，∠AOC=90°−∠1=90°−45°=45°，∠MOD=180°−∠1=180°−45°=135°．【解析】(1)根据垂直的定义可得∠1+∠AOC=90°，再求出∠2+∠AOC=90°，然后根据平角等于180°列式求解即可；(2)根据垂直的定义可得∠AOM=∠BOM=90°，然后列方程求出∠1，再根据余角和邻补角的定义求解即可．本题考查了垂线的定义，邻补角的定义，熟记概念并准确识图，找准各角之间的关系是解题的关键．20.【答案】解：(1)∠1与∠4是同位角；∠1与∠2是内错角；∠1与∠5是同旁内角．(2)如果∠1=∠2，那么∠1与∠4相等，∠1与∠5互补．理由如下：因为∠1=∠2，∠2=∠4，∠2+∠5=180°，所以∠1=∠4，∠1+∠5=180°．【解析】本题主要考查了同位角，内错角和同旁内角，关键是熟练掌握同位角，内错角和同旁内角的概念．(1)根据同位角，内错角和同旁内角的概念可得结论；(2)根据角之间的关系即可确定．21.【答案】解：(1)∵∠COM=120°，∴∠DOF=120°．∵OG平分∠DOF，∴∠FOG=60°．(2)与∠FOG互为同位角的角是∠BMF．(3)∵∠COM=120°，∴∠COF=60°．∠COF，∵∠EMB=12∴∠EMB=30°．∴∠AMO=30°．【解析】本题考查了同位角的定义，角平分线定义以及对顶角的性质，能综合运用知识点进行推理和计算是解此题的关键．(1)根据对顶角相等可得∠DOF的度数，再根据角平分线的定义可求∠FOG的度数;(2)根据同位角的定义可求与∠FOG互为同位角的角;(3)首先根据∠COM的度数求得∠COF度数，结合∠EMB=12∠COF求得∠EMB的度数，最后根据对顶角相等求得答案．22.【答案】解：(1)∵OA平分∠EOC，∴∠AOC=12∠EOC=12×70°=35°，∴∠BOD=∠AOC=35°；(2)设∠EOC=2x，∠EOD=3x，根据题意得2x+3x=180°，解得x=36°，∴∠EOC=2x=72°，∴∠AOC=12∠EOC=12×72°=36°，∴∠BOD=∠AOC=36°．【解析】考查了角的计算：1个直角=90°；1个平角=180°.也考查了角平分线的定义和对顶角的性质．(1)根据角平分线定义得到∠AOC=12∠EOC=12×70°=35°，然后根据对顶角相等得到∠BOD=∠AOC=35°；(2)先设∠EOC=2x，∠EOD=3x，根据平角的定义得2x+3x=180°，解得x=36°，则∠EOC=2x=72°，然后与(1)的计算方法一样，可求得∠BOD的度数．。

河南省新乡市牧野区河南师范大学附属中学2020-2021学年九年级下学期开学考试化学试题(无答案)

2020-2021学年第二学期九年级第一次月考《化学》试卷相对原子质量：H-1 C-12 N-14 O-16 Mg-24 Cl-35.5 Ca-40 Mn-55 Fe-56 Cu-64 Zn-65 Ag-108一、选择题（每小题1分，共14分，每题只有一个选项符合题意）1.下列著名诗句中隐含化学变化的是【】①千里冰封，万里雪飘②白玉为堂，金做马③野火烧不尽，春风吹又生④夜来风雨声，花落知多少⑤春蚕到死丝方尽，蜡炬成灰泪始干A.①②B.④⑤C.③⑤D.②⑤2.下列实验操作正确的是【】A. B. C. D.3.在空气质量评价中，未被计入主要污染物的物质是【】A.二氧化碳B.二氧化硫C.二氧化氮D.臭氧Li+MnO=LiMnO。

根据上4.如图为锂元素信息和锂原子的结构示意图，锂电池放电时的化学方程式为22述信息，下列说法错误的是【】A.该反应属于化合反应B.反应前后Li元素的化合价发生了变化C.该反应产物属于氧化物D.锂元素位于元素周期表中第二周期5.能降低水的硬度且净化程度最高的净水方法是【】A.沉淀B.吸附C.过滤D.蒸馏6.在新冠疫情防控过程中，人们使用的一种免洗洗手消毒夜里含有三氯羟基二苯醚（简称三氯生，化学式为C12H7O2Cl3），下列表述正确的是【】A.三氯生由碳、氢、氧和氯元素组成B.一个三氮生分子中含有一个氧分子C.三氯生的相对分子质量为289.5gD.三氯生中氢、氧元素的质量比为7:27.关于物质的转化：H2→H2O；CO→CO2；CaO→Ca（OH）2。

下列正确的是【】A.都能通过化合反应实现B.都能通过和单质反应实现C.都能通过置换反应实现D.都有元素化合价的改变8.下列有关一氧化碳的叙述，不正确的是【】A.一氧化碳是一种难溶于水的气体B.一氧化碳是碳不充分燃烧的产物C.一氧化碳燃烧时火焰呈蓝色，可以做燃料D.一氧化碳中毒发生的是物理变化9.将质量相等的A、B、C三种金属，同时分别放入三份溶质质量分数相同且足量的稀盐酸中，反应生成H2的质量与反应时间的关系如图所示，根据图中所提供的信息，得出的结论正确的是（已知：A、B、C在生成物中均为+2价）【】A.放出H2的质量是B>A>CB.金属活动性顺序是A>B>CC.反应速率最大的是AD.相对原子质量是C>B>A10.下列有关金属资源的利用和防护解释不合理的是【】A.在001A型国产航母金属外壳覆盖涂料，主要是为了美观B.用“烤蓝”的方法处理钢铁表面，可减缓钢铁的腐蚀C.用铝合金制造国产飞机C919机壳，是利用铝合金强度大、质量轻、抗腐蚀D.切菜后的菜刀用清水洗净擦干，可减缓菜刀生锈11.欲配置500g溶质质量分数为0.9%的NaCl溶液，下列操作将导致结果偏大的是【】①称量NaCl固体时物码防反且动用了游码②用量筒量取水时俯视读数③将量筒中的水倒入烧杯中时有少量水溅出④将配制好的溶液装入试剂瓶中时有少量溅出A.①②B.②③C.②④D.③④12.下列实验方法错误的是【】13.下列图像不能正确反映对应变化关系的是【】A.向一定量二氧化锰中加过氧化氢溶液B.加热一定量的高锰酸钾固体C.一定质量的Mg在装有空气的密闭容器内燃烧D.将水通电电解一段时间14.氧化钙和碳酸钙的固体混合物质量为50g，将其高温煅烧至碳酸钙完全分解，称得剩余固体的质量为35g。

2020-2021学年河南省新乡市名校联考高二(下)期末英语试卷(附答案详解)

2020-2021学年河南省新乡市名校联考高二（下）期末英语试卷一、阅读理解（本大题共15小题，共30.0分）ASunflower season generally runs from late July,so be sure to visit the best sunflower fields near Chicago.Thompson Strawberry FarmThis huge Wisconsin sunflower field covers an area of 15 acres,so come prepared with scissors and a jar to prepare for a long day of picking.Visitors are welcome to cut up to a dozen sunflowers from the field,but if you really want to take home a few more,additional flowers will only set you back a dollar each.﹩25 per car for up to six people, ﹩5 per person for more than six people.Heap's Giant Pumpkin FarmFlower enthusiasts will delight in walking through more than 5 acres of sunflowers at this farm,which offers an all-day pass that gives you access to the sunflower field and other farm attractions like corn mazes（迷宫）.You can buy a De Bucket：a ﹩20 basket you can fill with as many flowers as you can fit inside.Thistleberry FarmThough some of its previous summer sunflower fields have already been cleaned,South Bend's Thistleberry Farm will once again erupt in a 3-acre sea of sunflowers from September16-27.You can order tickets online to reserve a spot before visiting.﹩6 per person plus a ﹩l online processing fee.M&D Farm and Garden CenterLocated just 45 minutes of driving outside the city in Homer Glen,Illinois,this 10-acre farm allow for six weeks throughout the season.Check the farm's Facebook page for updates about when the field will enter full golden time - and when you visit,be sure to have a couple of fresh cut sunflowers for ﹩2.50 each.﹩5 Monday -Friday, ﹩7 Saturday - Sunday,children under 3 free.1.Which sunflower field is the largest？______A. Thistleberry Farm.B. Thompson Strawberry Farm.C. Heap's Giant Pumpkin Farm.D. M&D Farm and Garden Center.2.What service can Thistleberry Farm offer to visitors？______A. Free Admission.B. Sunflower cleaning.C. Online ticket booking.D. Sunflower delivery.3.How much will you pay to get ten sunflowers at M&D Farm and Garden Center？______A. ﹩10.B. ﹩20.C. ﹩25.D. ﹩50.BBrandon Jones and his wife,Rina,needed some carryout.They needed the fried broccoli（西蓝花）from Ekiben,the beloved local restaurant.Not just for any customer.The dish was for Rina's mom,who lives in Vermont and is dying of lung cancer.Rina's mom had loved the dish since she first came to visit her daughter six years ago in Baltimore. "She had jokingly said that she wanted it on her deathbed," Rina said.In December,Rina's mother became ill with cancer.She chose to live her last days on her own terms at home.Last week,as Brandon and Rina prepared to visit Rina's mom,they wondered about one thing.How could they make that fried broccoli from Ekiben for her？Brandon emailed Ekiben's owners Steve Chu and Ephrem Abebe for some tips.Chu wrote back that he and Abebe would meet them in Vermont.They would cook it themselves.They just need the date,time and location.On Saturday,Chu,and Abebe made the six-hour drive to Vermont in a pickup.They pulled up to Rina's mom's house the following day.Like magic,the snow paused.They set up the fryer in the back of the truck,staying outside to keep things a surprise,and out of concern for COVID-19.It took several hours for the fryer to get up to temperature.When all was said and done,Chu said,"It was the most perfect broccoli we ever made."The odor of the frying food flew into the house.Rina said it took her mom a moment to realize what was going on. "This is from Baltimore!" she said.Rina said her mom,who has struggled to eat because of sores on her mouth from the cancer,managed to eat the broccoli. "I can't believethat people would be so generous and kind for someone that they don't even know," Rina said.Chu and Abebe,she said,wouldn't even accept gas money.4.What can be inferred about Rina's mom from Paragraph 2？______A. She prefers vegetables.B. She is weak and ridiculous.C. She is humorous and positive.D. She feels terrible in hospitals.5.What was the weather like in Vermont that Sunday？______A. Cold.B. Windy.C. Sunny.D. Warm.6.What does the underlined word "odor" mean in the last paragraph？______A. Food.B. Wind.C. Noise.D. Smell.7.What did Chu and Abebe refuse to accept？______A. Some tips.B. Food material costs.C. Customers' thanks.D. Transport expenses.CSwedish teen Greta Thunberg began the climate strike movement in 2018 by sitting outside Parliament,protesting（抗议）her government's lack of action on global warming.Soon people were organizing similar protests around the world.The strikes were usually held on Fridays,which the protesters called "Fridays for Future".Large climate strikes have now been held in many countries,making Thunberg the focus of attention.In September,2019，4 million people took part in another global climate strike.Most of the protesters were young people because they were worried that climate change would affect them much more than adults.On 20th,July,2020，she was awarded the Gulbenkian Prize for Humanity（GPFH），valued at one million euros.The prize is awarded each year to a person or group that is dealing with climate change in a powerful way.Thunberg was one of 135 people who were suggested for the prize from 46 countries around the world.The judges chose Thumherg not only because she worked hard to bring action on climate change,but because she inspired other young people to also take action.One judge called her "one of the most remarkable figures of our days".This isn't the first prize that Thunberg has been awarded.In 2019，she was Time Magazine's Person of the Year.She was given the Swedish Right Livelihood Award,and even been suggested for the Nobel Peace Prize twice.Thunberg said she was "extremely honored" to win the Gulbenkian Prize. "That is more moneythan I can imagine," she said. "But all the prize money will be donated,through my foundation,to different organizations and projects which are working to help people on the front line.Thunberg has decided to give the first 100，000 euros to SOS Amazonia to help slow COVID-19 outbreak in the Amazon rainforest.She's giving another 100，000 euros of the prize money to the Stop Ecocide Foundation.It is a group which has the goal of making it illegal to destroy the environment.8.What made Greta Thunberg famous？______A. Organizing a violent strike.B. Studying climate change a lot.C. Pointing out the fault of the government.D. Contributing to global climate movements.9.Why did the judges agree to award Thunberg the CPFH？______A. Because She established her own foundations.B. Because She promised to donate the prize money.C. Because She inspired other young people to join her.D. Because She was suggested for the Nobel Peace Prize.10.How did Thunberg feel about the amount of the prize money？______A. It's doubtful.B. It's unexpected.C. It's understandable.D. It's unsatisfactory.11.What's the author's purpose in writing the text？______A. To sing high praise for Thunberg.B. To introduce the Gulbenkian Prize.C. To urge people to face climate change.D. To stress the effect of the climate strikes.DCoral reefs（珊瑚礁）are in great danger ，due to warming oceans.Conservationists are worried about how to save them,but a new study might come as music to their ears.A team of scientists came up with an unusual idea to play underwater sounds along degraded （退化）coral reefs of Australia's Great Barrier Reef that would copy the usual noises heard on a healthy and active reef.When they did so,they found that fish were attracted to the music and more willing to hang around.Dr.Stephen Simpson,a researcher at the University of Exeter,UK，said that coral reefs are remarkably noisy places full of various sounds.Young fish will be attracted to these sounds after they spent their early stage in the open ocean.However,once a reef becomes degraded,it smells and sounds less attractive to the young fish,who choose to settle elsewhere,thus speeding up further degradation of the reef.In the experiment,reefs were given one of three experimental treatments.They either had no loudspeaker,a fake loudspeaker,or a real loudspeaker that played reef sounds.Playback occurred for 40 days,always at nighttime,which is when fish settlement typically occurs. After 40 days,there were twice as many young fish on reefs with real loudspeakers than the other two kinds of reefs,with no significant differences between the two control treatments.And biodiversity also increased by 50%，with more species attracted to the sound.While the presence of fish alone cannot restore a coral reef to good health,study authorDr.Mark Meekan explained that "recovery is encouraged by fish that clean the reefs and create space for corals to regrow".This could promote a "snowball effect"，with other fish responding positively to communities founded earlier,causing further increases in settlement.The researchers hope that this discovery can add to reef restoration efforts because,at this point ，the reefs need all the help they can get.12.How will conservationists feel about the new study？______A. Hopeful.B. Amused.C. Worried.D. Uncertain.13.What is the purpose of the experiment？______A. To explain the importance of sounds to corals.B. To figure out the effect of some sounds on fish.C. To prove the relationship between fish and corals.D. To show fish prefer to gather around loudspeakers.14.Why are fish important to corals？______A. They can provide food for corals.B. They can make beautiful music for corals.C. They can cure unhealthy corals of diseases.D. They can create room for the growth of corals.15.What might be the best title for the passage？______A. Fish Can Help Degraded Corals Produce MusicB. Reef Music Attracts Young Fish to Degraded CoralsC. Pleasant Music Can Help Coral Reefs Grow HealthilyD. Degraded Coral Reefs Can Create Music to Attract Fish二、阅读七选五（本大题共5小题，共10.0分）With the pandemic（疫情）approaching the end,it seems we should do something about our post-pandemic anxiety.（1）______ .Pause to listen to what your anxiety is trying to tell you"Anxiety arises as time passes,so we are fearful of a future event.（2）______ ，" Dr.Manly says. "So when we slow down to tune into our anxious thoughts by journaling,talking with friends,or just having quiet time,she says we may be able to better understand what is specifically worrying us."Develop some strategies for calming your nervesYou won't always have time to dig deep,so it's important to have a stable of techniques that can calm you down quickly.Some people like to write all their worries down and put them in an envelope as a way to put them aside.（3）______ .Plan your post-pandemic life with care（4）______ .However,Watson does recommend putting some thought into how you'd like your post pandemic life,and then taking steps to make that dream a reality.This can be as simple as planning a dinner party for a few friends six months from now,or booking a trip to Europe for 2022.（5）______"Remember,you don't have to do everything and see everyone all at once when things start returning to normal," Watson says. "We've taken our time to step back from the world in this crisis,so take your time stepping back into it." It's your body and your boundaries,so if you want to wear a mask a little longer than other people do,that's okay.Feel free to go back to normal life slowly if it makes you feel better.A.Go slowlyB.Stay in your own boundariesC.Many forms of planning are still difficult at this pointD.Below,experts advise on various strategies to get throughE.And now many people are feeling worried when the pandemic is overF.Here are some approaches experts mentioned to deal with the life in the pandemicG.Others wear a piece of jewelry or a smart watch as a focus for a quick calm down16. A. A B. B C. C D. D E.E F.F G. G17. A. A B. B C. C D. D E.E F.F G. G18. A. A B. B C. C D. D E.E F.F G. G19. A. A B. B C. C D. D E.E F.F G. G20. A. A B. B C. C D. D E.E F.F G. G三、完形填空（本大题共20小题，共30.0分）Samantha Whiting of Fort Hood,Texas,knows how lucky she and her daughter Haylee are to be alive today.A trip to the（1）______ in Monterey California this summer quickly became the mom's most frightening （2）______ when Haylee nearly lost her life.But thanks to a complete stranger,the （3）______ disaster turned into an act of heroism!Here's how it（4）______ .Haylee was playing happily in the waves（5）______ a riptide（激流）pulled the 10-year-old out to the sea.（6）______ this,Samantha rushed into the water to save her,but she（7）______ got caught in the riptide.Helpless and terrified,they screamed for help,catching the（8）______ of beach-goer Kevin Coxzi,who（9）______ ran over and began swimming toward them.With great（10）______ ，he pulled them to shore.Unfortunately,the pair never got the（11）______ to thank Kevin.All Samantha had was his first name and thanking him proved to be completely a（n）（12）______ .But the grateful mother didn't（13）______ ，eventually turning to the Internet.She posted it in the Merced Neighborhood Watch Facebook group-and （14）______ him hours later!While talking with him online,Samantha（15）______ that Kevin and his girlfriend,Maria Buenrostro,had to（16）______ their wedding because they didn't save enough money.Without （17）______ ，Samantha created a GoFundMe to help the couple with their wedding costs.So far,she's（18）______ over ﹩52，000 for them!"But for his（19）______ act,I would have lost not only my own life but my baby girl," Samantha wrote. "He（20）______ so much more than this."21. A. beach B. mountain C. square D. theater22. A. imagination B. example C. experience D. performance23. A. predictable B. familiar C. wrong D. potential24. A. happened B. functioned C. moved D. worked25. A. unless B. when C. even if D. in case26. A. Expecting B. Seeing C. Testing D. Avoiding27. A. still B. often C. also D. first28. A. trust B. attention C. interest D. sympathy29. A. suddenly B. secretly C. tiredly D. immediately30. A. effort B. courage C. determination D. patience31. A. responsibility B. chanceC. qualificationD. time32. A. excuse B. honor C. challenge D. promise33. A. step forward B. get back C. give up D. set out34. A. persuaded B. recognized C. selected D. found35. A. learned B. remembered C. described D. understood36. A. confirm B. arrange C. cancel D. prepare37. A. delay B. regret C. trouble D. explanation38. A. paid B. borrowed C. earned D. raised39. A. unfair B. unselfish C. natural D. legal40. A. desires B. concerns C. suffers D. deserves四、语法填空（本大题共1小题，共15.0分）41.As the countdown ticked down to zero at the Wenchang Space Launch Center in HainanProvince on April 29，a Long March 5 B heavy-lift carrier rocket managed to send the core capsule of China's space station,named Tianhe,into（1）______ （it）planned orbit.In 1992，China's government proposed（2）______ "three-step" strategy for aerospace engineering by first building a manned spacecraft,（3）______ （follow）by building mini space stations（Tiangong-land-2）and then China's own space station.Up to now,this launch（4）______ （bring）China closer to its final goal.The Tianhe core capsule's launch kicks off a series of launch missions（5）______ aimto complete the construction of China's space station.China's space station will be a T shape,with the core module（模块）at the center and a lab capsule on each side.It will be able to support three astronauts to work and live in for a long time or six astronauts（6）______ most for a short time.（7）______ （ensure）a quality life for astronauts,it's divided into six zones,（8）______ （include）zones for work,sleep,dining,healthcare and exercise.Forexample,astronauts may choose treadmills（跑步机）or spin bikes to maintain theirphysical health.The station is also expected to contribute to the peaceful development and utilization（使用）of space（9）______ （resource）through international cooperation,as（10）______ （good）as to enrich technologies and experiences for China's future explorations into deeper space.五、短文改错（本大题共1小题，共10.0分）42.假定英语课上老师要求同桌之间交换修改作文，请你修改同桌写的以下作文。

河南省新乡市名校联盟2020-2021学年高二年级下学期期末联合考试数学(理)试题(解析版)

绝密★启用前河南省新乡市名校联盟2020-2021学年高二年级下学期期末联合考试数学(理)试题(解析版)一、选择题（共12小题,每小题5分,共60分）.1．设集合M＝{x|2x﹣x2≥0},N＝{x|x＜a},若M⊆N,则实数a的取值范围是（）A．a＜2 B．a＞2 C．a≥2 D．a≤2解：由已知可得M＝[0,2],N＝（﹣∞,a）,因为M⊆N,则只需a＞2,故选：B．2．已知复数z＝（i为虚数单位）,则|z|＝（）A．1 B．C．2 D．解：∵z＝＝＝,∴．故选：D．3．已知等差数列{an}的前n项和为Sn,若S5＝40,a2＝5,则S11＝（）A．165 B．176 C．180 D．187解：设等差数列{an}的首项为a1,公差为d,由S5＝40,a2＝5,可得,解得a1＝2,d＝3,所以a6＝a1+5d＝2+15＝17,所以S11＝11a6＝11×17＝187．故选：D．4．党的十九大报告中指出：从2020年到2035年,在全面建成小康社会的基础上,再奋斗15年,基本实现社会主义现代化．若到2035年底我国人口数量增长至14.4亿,由2013年到2019年的统计数据可得国内生产总值（GDP）y（单位：万亿元）关于年份代号x的回归方程为＝6.6x+50.4（x＝1,2,3,4,5,6,7）,由回归方程预测我国在2035年底人均国内生产总值（单位：万元）约为（）A．14.0 B．13.6 C．202.2 D．195.6解：到2035年底对应的年份代号为23,把x＝23代入＝6.6x+50.4得,＝6.6×23+50.4＝202.2（万亿元）,又≈14.0,所以到2035年底,我过人均国内生产总值约为14.0万元．故选：A．5．北斗导航系统由55颗卫星组成,于2020年6月23日完成全球组网部署,全面投入使用．北斗七星自古是我国人民辨别方向判断季节的重要依据,北斗七星分别为天枢、天璇、天玑、天权、玉衡、开阳、摇光,其中玉衡最亮,天权最暗．一名天文爱好者从七颗星中随机选两颗进行观测,则玉衡和天权至少一颗被选中的概率为（）A．B．C．D．解：北斗七星分别为天枢、天璇、天玑、天权、玉衡、开阳、摇光,其中玉衡最亮,天权最暗．一名天文爱好者从七颗星中随机选两颗进行观测,基本事件总数n＝＝21,玉衡和天权至少一颗被选中包含的基本事件个数m＝＝11,。

河南省新乡市河南师大附中双语国际学校2020-2021学年高一数学文联考试题含解析

河南省新乡市河南师大附中双语国际学校2020-2021学年高一数学文联考试题含解析一、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. 已知a＞0且a≠1，则函数f（x）=a x与函数g（x）=log a x的图象可能是（）A．B．C．D．参考答案：B【考点】函数的图象．【专题】计算题；数形结合；数形结合法；函数的性质及应用．【分析】由指数函数与对数函数的性质可知，函数f（x）=a x与函数g（x）=log a x的图象关于y=x对称且单调性相同，从而解得．【解答】解：由反函数知，函数f（x）=a x与函数g（x）=log a x的图象关于y=x对称，由函数的单调性可知，函数f（x）=a x与函数g（x）=log a x的单调性相同，故排除A，C，D；故选：B．【点评】本题考查了函数的性质的判断与函数的图象的关系应用，考查了数形结合的思想应用及排除法的应用．2. 在等比数列{a n}中，a1=﹣16，a4=8，则a7=（）A．﹣4 B．±4C．﹣2 D．±2参考答案：A【考点】88：等比数列的通项公式．【分析】由等比数列的性质可得，a1?a7=a42结合已知可求【解答】解：由等比数列的性质可得，a1?a7=a42故选：A．3. 在中，，则的值（）Ａ.Ｂ.Ｃ.Ｄ.参考答案：B4. 函数是幂函数，且在上为增函数，则实数的值是（ )A．B． C. D．或参考答案：B5. 函数y＝f(x)是定义在实数集R上的函数，那么y＝－f(x＋4)与y＝f(6－x)的图像之间（）A．关于直线x＝5对称B．关于直线x＝1对称C．关于点（5，0）对称D．关于点（1，0）对称参考答案：D略6. 在上满足的x的取值范围是（）A. B. C. D.参考答案：B试题分析：在[0，2π]上满足sinx≥，由三角函数线可知，满足sinx≥的解，在图中阴影部分，故选B。

河南省新乡市新乡县河南师大附中实验学校2020-2021学年八年级上学期第二次月考数学试题及参考答案

解得a= ，b=3，
所以，点P的坐标为（，3），
∵P（a，b）关于y轴的对称点为P′，
∴P′（- ，3）．
故答案为．
【点睛】
本题考查了关于y轴对称的点的坐标，解决本题的关键是掌握好对称点的坐标规律：关于y轴对称的点，纵坐标相同，横坐标互为相反数；还考查了非负数的性质：几个非负数的和为0时，这几个非负数都为0．
（2）把看作一个整体，用完全平方公式分解．
【详解】
解：（1）原式=
=
=
（2）原式=（a+b）2-12（a+b）+62
=（a+b-6）2．
【点睛】
本题考查了提公因式法与公式法分解因式，要求灵活使用各种方法对多项式进行因式分解，一般来说，如果可以先提取公因式的要先提取公因式，再考虑运用公式法分解．
（1）若△A1B1C1与△ABC关于y轴成轴对称，则△A1B1C1三个顶点坐标分别为A1_____，B1_____，C1_____
（2）在y轴上是否存在点Q．使得S△ACQ= S△ABC，如果存在，求出点Q的坐标，如果不存在，说明理由；
（3）在x轴上找一点P，使PA+PB的值最小，请直接写出点P的坐标是_____．
解得x=2．
则OE=OF=OD=2．
故选：B．
【点睛】
此题综合考查角平分线的性质、全等三角形的判定和性质和正方形的判定等知识点，设未知数，并用未知数表示各边是关键．
8．B
【分析】
根据SAS可证得 ≌ ，可得出，继而可得出答案，再根据邻补角的定义求解.
【详解】
由题意得：，，，
≌ ，
，
．
故选B．
∴O是CD中点，则D选项正确，

2020-2021学年河南师范大学附属中学高三语文第二次联考试卷及参考答案

2020-2021学年河南师范大学附属中学高三语文第二次联考试卷及参考答案一、现代文阅读（36分）(一)现代文阅读I(9分)1.阅读下面内容，选出对其理解正确的一项（）在定型生活中长大的有着深入生理基础的习惯帮着我们“日出而起，日入而息”的工作节奏。

记忆都是多余的，“不知老之将至”就是描写“忘时”的生活。

秦亡汉兴，没有关系。

乡土社会中不怕忘，而且忘得舒服。

只有在轶出于生活常轨的事，当我怕忘记时，方在指头上打一个结。

A.乡土社会是“面对面社群”，所以不需要复杂文字。

B.乡土社会文化趋于稳定，对“发展记忆”的要求不高。

C.乡土社会要描写“忘时”生活，是“借助文字的社会”。

D.乡土社会是“血缘社会”，需要用“习俗”来维持稳定。

(二)现代文阅读II(12分)阅读下面的文字，完成各题。

大自然的智慧赵大年蜘蛛天生就会结网捕食。

它在体内制造黏性、韧性很高又无色透明的“隐形”蛛丝，选择蛾蝶蚊蝇等飞虫的林间通道巧妙织网，然后躲于暗处，一旦有自投罗网者，信息立刻由蛛丝的颤动传递给蜘蛛，它也会迅速赶到，咬住俘虏，将自制的麻药通过牙齿输入俘虏体内，使其丧失抵抗或逃跑的能力，再放心地把俘虏吃掉。

若有多个俘虏撞网，一时吃不完，它就用蛛丝捆绑起来，下顿再吃。

要问这些本领和计谋是谁教它的？生物学家也无法仔细解答，只好笼统地说是蜘蛛的本能。

其实，人类对于自然界的奥秘知之甚少。

聪明人不妨先学习大自然的智慧——我看编织渔网就是从蜘蛛那里，真是个改变人生的巨大发明呀！人类自从捕鱼，至今已经衍生出多少有形和无形的网啊，公路网，铁路网，航空网，法网，关系网，通信网，互联网——天罗地网！只是忘了感谢蜘蛛。

亚马逊森林大蜘蛛的网可以缠住鸟雀，它再使劲扑棱也挣不断这神秘的蛛丝。

经测定，蛛丝的韧性强于钢丝，而且重量轻得多。

已经有人在分析蛛丝的成分，都是蛋白质之类的有机物，若能人工合成，可能会是一种用途广泛的新材料。

出于同样的想法，人们发现多种昆虫的外皮又薄又轻又有韧性，譬如蝗虫的“外骨骼”，既能保护内脏和肌肉，又支撑全身，使蝗虫能轻盈地弹跳、飞翔，这种外皮也是很好的材料呀。

河南省新乡市河南师大实验中学高三化学联考试卷含解析

河南省新乡市河南师大实验中学高三化学联考试卷含解析一、单选题（本大题共15个小题，每小题4分。

在每小题给出的四个选项中，只有一项符合题目要求，共60分。

）1. 下列离子方程式与所述事实相符且正确的是A．用铁棒作阴极、炭棒作阳极电解饱和氯化钠溶液：2Cl- +2H2O H2↑+ Cl2↑+ 2OH-B．用稀硝酸清洗做过银镜反应的试管：Ag＋NO3－＋4H＋= Ag＋＋NO↑＋2H2OC．向FeBr2溶液中通入过量的Cl2：2Fe2+ + 2Br－+ 2Cl2 = 2Fe3+ + Br2 + 4Cl－D．在强碱性溶液中，次氯酸钠将Mn2＋氧化成MnO2：Mn2＋＋ClO－＋H2O = MnO2↓＋Cl－＋2H＋参考答案：A略2. 下图是元素周期表的一部分，下列说法中正确的是A．元素①位于第二周期第ⅣA族 B．气态氢化物的稳定性：④＜②C．最高价氧化物对应水化物的酸性：⑤＞④ D．元素的最高正化合价：③＝⑤参考答案：BC 略3. 在酸性溶液中，下列各组离子能大量共存且溶液为无色透明的是A．Na+、K+、OH－、Cl－B．Na+、Cu2+、SO42－、NO3－C．Mg2+、Na+、SO42－、Cl－D．K+、Na+、NO3－、CO32－参考答案：C4. 在20mlPH＝2的醋酸中，加入VmlPH＝12的NaOH溶液, 则下列说法正确的是A 如果V＝20，则所得混合溶液的PH大于7B 当V＝20时，混合溶液中的离子浓度大小关系为C（Na+）>C(CH3COO_)>C(H+)>C(OH_)C 如果所得混合溶液的PH=7 则V<20D 所得混合溶液中一定存在C（Na+）+ C(H+)= C(CH3COO_)+ C(OH_)参考答案：D5. 用酸性KMnO4溶液不能达到预期目的的是A．区别苯和甲苯B．检验硫酸铁溶液中是否有硫酸亚铁C．检验CH2=CHCHO中含碳碳双键D．区别SO2和CO2参考答案：C略6. 将a g铁和氧化铁的混合物加入800mL pH=1的盐酸中充分反应后，固体无剩余，盐酸全部消耗，放出标准状况下气体0.224L．则下列判断中正确的是（）A．原混合物中n（Fe）：n（Fe2O3）=2：1B．向溶液中滴入无色的KSCN溶液，显血红色C．无法计算出原混合物的质量D．此时溶液中Fe2+和Fe3+的物质的量之比为3：1参考答案：A考点：化学方程式的有关计算；有关混合物反应的计算．.专题：计算题．分析：由于氧化性Fe3+＞H+，所以当产生氢气时，Fe3+已经全部被还原为Fe2+，发生反应：Fe+2HCl=FeCl2+H2↑，Fe+Fe2O3+6HCl=3FeCl2+3H2O，计算生成氢气消耗Fe和HCl的物质的量，进而计算氧化铁消耗HCl的物质的量，再根据方程式计算出Fe2O3及氧化铁消耗Fe的物质的量，根据m=nM可以计算混合物的质量．解答：解：由于氧化性Fe3+＞H+，所以当产生氢气时，Fe3+已经全部被还原为Fe2+，生成氢气的物质的量==0.01mol，HCl物质的量=0.8L×1mol/L=0.8mol，发生反应：Fe+2HCl=FeCl2+H2↑，消耗Fe为0.01mol，消耗HCl为0.01mol×2=0.02mol，故反应Fe+Fe2O3+6HCl=3FeCl2+3H2O，消耗HCl为0.08mol﹣0.02mol=0.06mol，由方程式可知该反应中消耗Fe为0.06mol×=0.01mol，Fe2O3的物质的量=0.06mol×=0.01mol，A．原混合物中n（Fe）：n（Fe2O3）=（0.01mol+0.01mol）：0.01mol=2：1，故A正确；B．反应后溶液为FeCl2，向溶液中滴入无色的KSCN溶液，不显血红色，故B错误；C．Fe、氧化铁的物质的量已经计算出，根据m=nM可以计算混合物的质量，故C错误；D．溶液中含有Fe2+离子，没有Fe3+离子，故D错误，故选A．点评：本题考查混合物计算，关键是根据氧化性Fe3+＞H+判断发生的反应，注意利用总反应方程式简化计算，难度中等．7. “碳捕捉技术”是指通过一定的方法将工业生产中产生的CO2分离出来并利用。

2019-2020学年河南师大附中、附属实验中学等新乡市名校联考七年级(上)期末生物试卷

2019-2020学年河南师大附中、附属实验中学等新乡市名校联考七年级（上）期末生物试卷一、选择题（每题1分，共20分）1．（1分）含羞草的部分小叶受到震动后合拢下垂这个生命现象属于（）A．新陈代谢B．应激性C．变异D．生物和环境的相互影响2．（1分）下列实例中，体现了生物与环境相适应的是（）A．大树底下好乘凉B．荒漠中的骆驼刺根系非常发达C．千里之堤，毁于蚁穴D．蚯蚓的活动使土壤疏松3．（1分）“螳螂捕蝉黄雀在后”主要描述了生物之间的（）A．捕食关系B．合作关系C．竞争关系D．寄生关系4．（1分）小莉想把显微镜视野中的一个气泡从视野右下方移出去，应将玻片向哪个方向移动（）A．右上方B．左上方C．右下方D．左下方5．（1分）用显微镜观察标本时，第一次使用5×目镜、10×物镜，第二次使用10×目镜、40×物镜，那么，第二次观察到的情况与第一次相比（）A．视野亮，细胞数目多B．视野亮，细胞数目少C．视野暗，细胞数目多D．视野暗，细胞数目少6．（1分）“满筐圆实骊珠滑，入口甘香冰玉寒。

”葡萄中含有丰富的营养物质，入口甘香的汁液来自（）A．细胞膜B．细胞质C．细胞核D．液泡7．（1分）植物生长发育过程中需要量最大的含有哪些元素的无机盐（）A．氮、磷、钾B．铁、硼、钾C．钾、钙、镁D．钠、钾、铁8．（1分）关于种子萌发的过程，叙述错误的是（）A．种子萌发时，首先要吸收水分B．种子萌发时的营养都是来自子叶C．种子萌发时，最先突破种皮的是胚根D．胚轴伸长，发育成连接根和茎的部分9．（1分）当你和同学们漫步绿树成荫、遍地青草的林间小路上，你会感觉到空气特别地清新和湿润，此时你会想到这是绿色植物的什么作用改善了空气的质量？（）A．光合作用和呼吸作用B．呼吸作用和运输作用C．光合作用和蒸腾作用D．蒸腾作用和输导作用10．（1分）“春种一粒粟，秋收万颗籽”，一棵参天大树也是由一颗种子发育来的，其实是因为种子中包含有发育成一株完整植物的（）A．营养物质B．水分C．胚11．（1分）黄瓜叶肉细胞和人体口腔上皮细胞共有的结构是（）A．细胞壁B．叶绿体C．线粒体D．液泡12．（1分）下列有关细胞分裂描述正确的是（）A．在细胞分裂时，染色体会进行复制B．刚分裂出来的子细胞与母细胞体积相同C．动植物细胞分裂时都是细胞质先一分为二D．所有细胞生长到一定程度后都可以再进行分裂13．（1分）炎炎夏日，人们常说“大树底下好乘凉”，主要的原因是植物进行（）A．呼吸作用B．光合作用C．蒸腾作用D．吸收作用14．（1分）“西湖春色归，春水绿于染”、“苔痕上阶绿，草色入帘青”中主要描述的植物类群是（）A．藻类植物和苔藓植物B．藻类植物和蕨类植物C．苔藓植物和蕨类植物D．蕨类植物和被子植物15．（1分）植物光合作用的实质是（）A．合成有机物，释放能量B．合成有机物，贮存能量C．分解有机物，贮存能量D．分解有机物，释放能量16．（1分）“小草依依，踏之何忍”这提示语提示人们不要踩踏小草，因为经常在草地上走，会造成土壤板结，从而影响草的生长．其主要原因是（）A．植物缺少无机盐，影响根的呼吸作用B．植物缺少水，影响光合作用C．土壤缺少氧气，影响根的呼吸作用D．小草气孔关闭，影响光合作用17．（1分）“接天莲叶无穷碧，映日荷花别样红。

2020届河南师范大学附属中学高三英语第一次联考试卷及参考答案

2020届河南师范大学附属中学高三英语第一次联考试卷及参考答案第一部分阅读（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ADesign a science holiday to win a science holidayIs there a scientific holiday,tour,vacation or experience in your list that you dream of making a reality? We might just be able to help with that! We are the crowd sourcing thoughts and suggestions onnew tours,and the winner will receive two free places on their tour when it's launched.Starting entries 1st May 2020Deadline 31st August 2020ENTER NOW---Write a brief description of your ideal science holiday,tour,vacation or experience.---No matter how big or small,we are looking for brilliant, unique thoughts.It can be a complex multi-location overseas holiday tour,a weekend away deep-diving,or a simple walking tour(and everything in between).---Our current tours are mainly individual-focused but we would love to hear ideas for families and schools.---Creations that have environmentally friendly themes and a low carbon impact are also welcome.---Your entry can be as simple as a great title but writing more specifies will improve the possibility of walking off with the prize.---The competition doesn't close by September,2020,so plenty of time to brainstorm your entry.---We will launch the best idea in late 2020 or at the beginning of 2021. The winner will receive the award once the result is published.If you want to submit more than 3,999 words,include photos/maps with your entry, or submit multiple entries then send it to tours @ . The competition guidelines and other related information are available at .1. When will the winner probably be announced?A. In August,2020.B. In September,2020.C. In January,2021.D. In May,2021.2. What kind of entries might be more likely to win?A. Those producing a low carbon impact.B. Those with a long and unique title.C. Those providing detailed information.D. Those for individual-focused tours.3. What is the purpose of this text?A. To give guidance on a competition.B. To advertise a science holiday.C. To inspire creativity in teenagers.D. To collect the ideas for tours.BImust have always known reading was very important because the first memories I have as a child deal with books. There was not one night that I don’t remember mom reading me a storybook by my bedside. I was extremely inspired by the wonderful way the words sounded.I always wanted to know what my mom was reading. Hearing mom say, “I can’t believe what’s printed in the newspaper this morning,” made me want to grab it out of her hands and read it myself. I wanted to be like my mom and know all of the things she knew. So I carried around a book, and each night, just to be like her, I would pretend to be reading.This is how everyone learned to read. We would start off with sentences, then paragraphs, and then stories. It seemed an unending journey, but even as a six-year-old girl I realized that knowing how to read could open many doors. When mom said, “The C-A-N-D-Y is hidden on the top shelf,” I knew where the candy was. My progress in reading raised my curiosity, and I wanted to know everything. I often found myself telling my mom to drive more slowly, so that I could read all of the road signs we passed.Most of my reading through primary, middle and high school was factual reading. I read for knowledge, and to make A’s on my tests. Sometimes, I would read a novel that was assigned, but I didn’t enjoy this type of reading.I liked facts, things that are concrete. I thought anything abstract left too much room for argument.Now that I’m growing and the world I once knew as being so simple is becoming more complex, I find myself needing a way to escape. By opening a novel, I can leave behind my burdens and enter into a wonderful and mysterious world where I am now a new character. In these worlds I can become anyone. I don’t have to write down what happened or what technique the author was using when he or she wrote this. I just read to relax.We’re taught to read because it’s necessary for much of human understanding. Reading is an important part of my life. Reading satisfies my desire to keep learning. And I’ve found that the possibilities that lie within booksare limitless.4. Why did the author want to grab the newspaper out of mom’s hands？A. She wanted mom to read the news to her.B. She couldn’t wait to tear the newspaper apart.C. She couldn’t help but stopmom from reading.D. She was eager to know what had happened.5. According to Paragraph 3, the author’s reading of road signs shows___________.A. her own way to find herselfB. her eagerness to develop her reading abilityC. her growing desire to know the world around herD. her effort to remind mom to obey traffic rules6. The author takes novel reading as a way to___________.A. explore a mysterious landB. develop an interest in learningC. get away from a confusing worldD. learn about the adult world7. What could be the best title for the passage？A The Pleasure of Reading B. Growing Up with ReadingC. The Magic of ReadingD. Reading Makes a Full ManCA growing body of research is revealing associations between birth defects (缺陷) and a father's age, alcohol use and environmental factors, say researchers atGeorgetown University Medical Center. They say these defects result from epigenetic changes that can potentially affect multiple generations.The study, published in theAmerican Journal of Stem Cells, suggest both parents contribute to the health status of their offspring — a common sense conclusion which science is only now beginning to demonstrate, says the study's senior investigator, Joanna Kitlinska, PhD, an associate professor in biochemistry, and molecular and cellular biology.“We know the nutritional, hormonal and psychological environment provided by the mother permanently influences organ structure, cellular response and gene expression in her offspring,” she says.“But our study shows the same thing to be true with fathers — his lifestyle, and how old he is, can bereflected in molecules that control gene function,” she says. “In this way, a father can affect not only his immediate offspring, but future generations as well.”For example, a newborn can be diagnosed with fetal (胎儿的) alcohol spectrum disorder (FASD), even though the mother has never consumed alcohol, Kitlinska says. “Up to 75 percent of children with FASD have biological fathers who are alcoholics, suggesting that preconceptual paternal alcohol consumption negatively impacts their offspring.”Advanced age of a father is correlated with elevated rates of certain diseases, and birth defects in his children.A limited diet during a father’s preadolescence has been linked to reduced risk of cardiovascular death in his children and grandchildren. Paternal obesity is linked to enlarged fat cells, changes in metabolic regulation, diabetes, obesity and development of brain cancer. Psychosocial stress on the father is linked to defective behavioral traits in his offspring. And paternal alcohol use leads to decreased newborn birth weight, marked reduction in overall brain size and impaired cognitive function.“This new field of inherited paternal epigenetics needs to be organized into clinically applicable recommendations and lifestyle alternations,” Kitlinska says. “And to really understand the epigenetic influences of a child, we need to study the interplay between maternal and paternal effects, as opposed to considering each in isolation.”8. What’s the message the writer conveys in the passage?A. Both parents contribute to the health status of their offspring.B. Father’s age and lifestyle are tied to birth defects.C. Father plays a more critical role in birth defects.D. Birth defects can potentially affect multiple generations.9. What can we infer from the example in Paragraph 5?A. FASD can only be diagnosed in a newborn whose father is addicted to alcohol.B. A newborn will not contract FASD if his mother has never consumed alcohol.C. A father’s lifestyle can negatively impact his offspring.D. Most children have biological fathers who are alcoholics.10. Which of the following situations is less likely to lead to children’s birth defects?A. Having a father with a limited diet.B. Having a father who is an alcoholic.C. Having an overweight father.D. Having a father with psychosocial stress.11. What will the research probably continue to focus on in the part that follows?A. The maternal epigenetic influences of a child.B. The ways to avoid negative paternal influence on children.C. The clinical application of the research findings.D. The interaction between maternal and paternal effects.DThe idea of low material desire, low consumption and refusing to work, marry and have children, concluded as a “lying down” lifestyle, recentlystruck a chord withmany young Chinese who are eager to take pause to breathe in this fast-paced and highly-competitive society.Many millennials (千禧一代) and generation Zs complained to the Global Times that burdens, including work stress, family disputes (纷争) and financial strains, have pushed them “against the wall”. They said they hate the “involution (内卷),” joking that they would rather give up some of what they have than get trapped in an endless competition against peers.“Instead of always following the ‘virtues’ of struggle, endure and sacrifice to bear the stresses, they prefer a temporary lying down as catharsis (宣泄) and adjustment,” said a scholar. “It is no wonder that some young people, under the growing pressures from child-raising to paying the mortgage (按揭) today, would try to live in a simple way and leave the worries behind.”Interestingly, the majority of millennials and Gen Zs reached by the Global Times, who claim to be big fans of the lying down philosophy, acknowledged that they only accept a temporary lying down as a short rest. It is true that with the great improvement of living conditions, some Chinese youth have partially lost the spirit of hardship and are not willing to bear too much hard work. But in fact, lying down is not entirely comfortable. Young people who lie down always feel guilty about their constant loss of morale (士气) far beyond their reach.“Young people on campus have both aspirations and confusion about their future, but most of us have rejected setting ourselves up in chains to waste opportunities and challenges,” a postgraduate student told the Global Times. “It’s no use running away. I have to ‘stand up’ and face the reality sooner or later.”12. What does the underlined phrase in paragraph 1 mean?A. Warned.B. Criticized.C. Touched.D. Amused.13. What might have caused the “lying down” lifestyle among the young?A. Improvements in living conditions.B. Growing pressure from family and social life.C. Increasing material possessions from families.D. Temporary adjustment to failure in competitions.14. What’s the scholar’s attitude toward the “lying down” group?A. Understanding.B. Intolerant.C.Supportive.D. Unclear.15. What can be inferred about the young generation from the text?A. They never really drop their responsibilities.B. They really enjoy the “lying down” lifestyle.C. They find their dreams far beyond their reach.D. They would rather escape than take challenges.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。

河南省新乡名校2020-2021学年高二下学期期末联考语文试题 Word版含答案

新乡名校2020-2021学年下期期末联考高二语文试题（考试时间：150分钟试卷满分：150分）一、现代文阅读（36分）（一）论述类文本阅读（本题共3小题，9分）阅读下面的文字，完成1-3题。

在中国现代化进程中，传统文化助力与服务现代化的功能渐次增强，现代化也愈加需要传统文化为之筑牢民族根基。

中华传统文化在历史提供的重大机遇中，积极参与当代中国先进文化建构中，使自身成为现代化体系的重要组成部分和建设性内容；中华传统文化愈加呈现出丰富充沛的当代价值，成为现代化深化发展不可或缺的文化资源和精神力量。

习近平总书记指出：“中国优秀传统文化的丰富哲学思想、人文精神、教化思想、道德理念等，可以为人们认识和改造世界提供有益启迪，可以为治国理政提供有益启示，也可以为道德建设提供有益启发。

对传统文化中适合于调理社会关系和鼓励人们向上向善的内容，我们要结合时代条件加以继承和发扬，赋予其新的涵义。

”在充分肯定其当代价值与现实意义的同时，我们必须看到，发挥中华传统文化对现代化发展的促进作用，并非拿来就用，也不是自发实现的，而需要有鉴别地加以对待、有扬弃地予以继承，需要有针对性地进行改造、有创新性地推进提升。

一方面，切实推动中华传统文化实现创造性转化、创新性发展。

“创造性转化、创新性发展”是我们党对待中华传统文化的科学态度，是增强传统文化生命力和影响力的正确选择。

我们要以马克思主义为指导，以创造与创新为途径，以转化与发展为动力，着力推进中华传统文化内涵意蕴与时代诉求相协调、表达方式与社会发展相适应。

只有在创造性转化、创新性发展过程中，我们才能够深入传统文化内里，区别优劣得失，辨析精华糟粕，科学提炼精粹内容；才能找到适合时代要求的表达方式与表现形式，对具有现实价值的文化范畴和行为方式，予以必要改造并促其转型转化；才能把借鉴吸收与创新发展有机结合，做到弘扬传统而非食古不化；才能使传统文化经合理再造与整体提升后，更有效地服务于现代化发展。