第二次月考试卷
四川省成都市2023-2024学年高二下学期第二次月考物理试卷含答案
成都2023—2024学年度下期高2025届6月阶段性测试物理试卷(答案在最后)考试时间:75分钟满分:100分试卷说明:1.答卷前,考生务必将自己的姓名、考号填写在答题卡上。
2.回答选择题时,选出每小题答案后,用2B 铅笔把答题卡上对应题目的答案标号涂黑,如需改动,用橡皮擦干净后,再选涂其他答案标号。
回答非选择题时,用黑色签字笔将答案写在答题卡上,写在本试卷上无效。
3.考试结束后,试卷自己带走,只将答题卡交回。
一、单项选择题(本题共7个小题,每小题4分,共28分。
在每小题给出的四个选项中只有一项符合题目要求。
选对得4分,选错得0分。
)1.如图所示,两个正点电荷A 、B 所带电荷量分别为AQ 和BQ ,C 是A 、B 连线上一点,A 、C 之间的距离是B 、C 之间距离的3倍,在A 、B 连线上,C 点的电势最低,则AQ 和BQ 之间关系正确的是( )A.A B 2Q Q =B.A B 3Q Q =C.A B 6Q Q =D.A B9Q Q =【答案】D 【解析】【详解】C 点的电势最低,则C 点的场强为0(A 、C 之间,B 、C 之间场强均大于0),根据场强2QE kr =得A B9Q Q =故选D 。
2.如图所示,光滑固定金属导轨M 、N 水平放置,两根导体棒P 、Q 平行放于导轨上,形成一个闭合回路,当条形磁铁从高处下落接近回路的过程中,下列说法正确的是()A.P 、Q 将相互远离B.P 、Q 对导轨M 、N 的压力小于自身重力C.磁铁下落的加速度可能大于重力加速度gD.磁铁动能的增加量小于重力势能的减少量【答案】D 【解析】【详解】A .当条形磁铁从高处下落接近回路的过程中,穿过回路的磁通量增大,则由“增缩减扩”可得,P 、Q 将相互靠近,故A 错误;BC .由于穿过回路的磁通量增大,则由“来拒去留”可得,竖直方向磁铁受到向上的力,由于力的作用是相互的,则P 、Q 棒受到向下的力,则磁铁下落的加速度肯定小于重力加速度,P 、Q 对导轨M 、N 的压力大于自身重力,故BC 错误;D .由能量守恒可得,磁铁减小的重力势能等于磁铁增加的动能、导体棒增加的动能以及产生的焦耳热之和,则磁铁动能的增加量小于重力势能的减少量,故D 正确。
2023-2024学年陕西省西安市光中学教育集团九年级(上)第二次月考物理试卷+答案解析
2023-2024学年陕西省西安市光中学教育集团九年级(上)第二次月考物理试卷一、单选题:本大题共10小题,共20分。
1.很多物理量的单位是以科学家名字命名的。
下列以科学家的名字命名的物理量单位与其物理量对应正确的是()A.安培——电阻B.欧姆——电压C.焦耳——热量D.伏特——电流2.下列四组物体中,在通常情况下都不容易导电的是()A.空气、人体B.陶瓷管、橡胶棒C.石墨棒、金属丝D.盐水溶液、塑料3.如图甲是小华在学校科技实践活动中自制的盐水动力车,主要是由盐水电池和一个小电动机组装而成的。
图乙是他在测量自制盐水电池的电压,下列内容摘自关于盐水动力车的说明书,其中说法不合理的是()A.盐水电池给小车供电时,化学能转化为电能B.盐水电池供电时不会升温C.自制盐水电池的电压是D.小车运动时电能转化为机械能4.下列有关电阻、变阻器说法正确的是()A.电阻是导体对电流的阻碍作用,导体中没有电流流过时,导体就没有电阻B.电阻是导体的一种性质,与电压成正比,与电流成反比C.将一根金属丝缓慢拉长后,其电阻变大D.滑动变阻器是通过改变电阻丝的横截面积来改变电阻的5.下列各图中,电流表能直接测量通过灯泡的电流的电路是()A. B.C. D.6.如图所示是电阻、的电压-电流关系图像,下列说法正确的是()A.电阻的阻值是B.的阻值小于的阻值C.电阻、串联,当电流为时,、两端总电压为3VD.电阻、并联,当电源电压为2V时,干路中的电流是7.用如图所示的器材探究影响导体电阻大小的因素,分别选用A、B、C、D四根不同的金属丝接入M、N 两点之间,下列说法正确的是()A.接A、D,可探究导体电阻大小与导体长度是否有关B.接C比接B时电流表示数更大一些C.接A、C,可探究导体电阻大小与横截面积是否有关D.该实验装置不能探究导体电阻与导体材料的关系8.在图所示的各电路中,闭合电键S后,在滑动变阻器滑片P向右移动的过程中,电表示数变化表示错误的是()A.电流表A示数变小B.电压表V示数变小C.电流表示数不变D.电流表A与电流表示数比值不变9.图甲是我们经常使用到的非接触式红外线测温枪的工作原理图。
安徽省六安第一中学2025届高三上学期第二次月考(9月)数学试卷
安徽省六安第一中学2025届高三上学期第二次月考(9月)数学试卷一、单选题1.已知集合(){}ln 4A x y x ==-,{}1,2,3,4,5B =,则A B =I ( ) A .{5}B .{1,2,3}C .{1,2,3,4}D .{1,2,3,4,5}2.已知31cos(),cos()55αβαβ-=-+=,则sin sin αβ=( )A .35-B .25-C .25D .353.已知命题p :“tan 2α=”,命题q :“3cos25α=-”,则命题p 是命题q 的( )A .充分必要条件B .充分不必要条件C .必要不充分条件D .既不充分也不必要条件4.已知角α,β的顶点均为坐标原点,始边均为x 轴正半轴,终边分别过点()1,2A ,()2,1B -,则tan2αβ+=( )A .3-或13B .3或13- C .3- D .135.已知函数()()πsin 03f x x ωω⎛⎫=+> ⎪⎝⎭在π0,2⎛⎫ ⎪⎝⎭上没有零点,则ω的取值范围是( )A .(]0,1B .40,3⎛⎤⎥⎝⎦ C .30,2⎛⎫ ⎪⎝⎭D .2,13⎛⎫ ⎪⎝⎭6.当x θ=时,()26sin 2sin cos 3222x x xf x =+-取得最大值,则tan θ=( )A .3B .3-C .13D .13-7.已知23ln 2,2ln3,3ln a b c πππ===,则( ) A .b c a >>B .c b a >>C .b a c >>D .a b c >>8.已知函数()(),f x g x 的定义域均为R ,()g x '为()g x 的导函数,且()()()()2,42f x g x f x g x ''+=--=,若()g x 为偶函数,则()()20222024f g '+=( ) A .0B .1C .2D .4二、多选题9.先将函数()sin f x x =图象上所有点的横坐标缩小到原来的12,纵坐标不变,再把图象向右平移π12个单位长度,最后把所得图象向上平移一个单位长度,得到函数()g x 的图象,则关于函数()g x ,下列说法正确的是( ) A .最小正周期为πB .在π0,4⎛⎫⎪⎝⎭上单调递增C .,42x ππ⎛⎫∈ ⎪⎝⎭时()2g x ⎤∈⎥⎝⎦D .其图象关于点π,012⎛⎫⎪⎝⎭对称10.设函数2()(1)(4)f x x x =--,则( )A .1x =是()f x 的的极小值点B .(2)(2)4f x f x ++-=-C .当π02x <<时,()2(sin )sin f x f x >D .不等式4(21)0f x -<-<的解集为{}12x x <<11.在ABC V 中,7AB =,5AC =,3BC =,点D 在线段AB 上,下列结论正确的是( )A .若CD 是高,则1514CD =B .若CD 是中线,则CD =C .若CD 是角平分线,则158CD =D .若3CD =,则D 是线段AB 的三等分点三、填空题12.已知2弧度的圆心角所对的弦长为2,那么这个圆心角所对弧长为. 13.已知a 、b 、c 分别为ABC V 的三个内角A 、B 、C 的对边,2a =,且()(sin sin )()sin a b A B c b C +-=-,则ABC V 面积的最大值为.14.若12,x x 是函数()()21e 12xf x ax a =-+∈R 的两个极值点且212x x ≥,则实数a 的取值范围为.四、解答题15.已知函数()()sin f x A x ωϕ=+(0A >,0ω>,ππ22ϕ-<<),函数()f x 和它的导函数f ′ x 的图象如图所示.(1)求函数()f x 的解析式; (2)已知()65f α=,求π212f α⎛⎫- ⎪⎝⎭'的值.16.在ABC V 中,内角,,A B C 的对边分别为,,a b c ,A ∠为钝角,7a =,sin 2cos B B . (1)求A ∠;(2)从条件①、条件②、条件③这三个条件中选择一个作为已知,使得ABC V 存在,求ABC V 的面积.条件①:7b =;条件②:13cos 14B =;条件③:sin c A 注:如果选择的条件不符合要求,第(2)问得0分;如果选择多个符合要求的条件分别解答,按第一个解答计分.17.在锐角三角形ABC 中,角,,A B C 的对边分别为,,a b c ,且满足sin cos sin2cos sin 1cos2A A BA A B+=-+.(1)若π3C =,求A 的大小; (2)求222c a b+的取值范围.18.设函数2π()(sin cos )22f x x x x ⎛⎫=++ ⎪⎝⎭.(1)求函数()f x 单调递减区间. (2)已知函数21π()()1sin 26g x f x x ⎡⎤=--⋅⎢⎥⎣⎦, ①证明:函数()g x 是周期函数,并求出()g x 的一个周期; ②求函数()g x 的值域.19.已知函数()ln(1)sin f x x x λ=+-. (1)求函数()f x 在0x =处的切线方程;(2)当1λ=时,判断函数()f x 在π,2⎡⎫+∞⎪⎢⎣⎭上零点的个数;(3)已知()()21e xf x ≥-在[0,π]x ∈上恒成立,求实数λ的取值范围.。
2022-2023学年下学期高一第二次月考语文试卷
2022-2023学年下学期高一第二次月考语文考生注意:1.本试卷满分100分,考试时间75分钟。
2.考生作答时,请将答案答在答题卡上,选择题每小题选出答案后,用2B铅笔把答题卡对应题的答案标号涂黑;非选择题请用直径0.5毫米黑色墨水签字笔在答题卡上各题的答题区域内作答,超出答题区域书写的答案无效,在试卷、草稿纸上作答无效。
...........................3.本卷命题范围:必修下第一单元;第八单元第一课。
一、现代文阅读(35分)(一)现代文阅读Ⅰ(本题共5小题,19分)阅读下面的文字,完成下面1-5小题。
材料一:习近平总书记在党的二十大报告中指出:“坚守中华文化立场,提炼展示中华文明的精神标识和文化精髓,加快构建中国话语和中国叙事体系,讲好中国故事、传播好中国声音,展现可信、可爱、可敬的中国形象。
”这鼓励我们立足时代发展,创新艺术表达,在更好满足人民精神文化需求、增强人民精神力量的过程中,把中国故事讲生动、讲精彩。
怎样讲好中国故事?作为从延河岸边走来的艺术院团,国家话剧院近年来以史料为依托,深入革命文化传统,创作了《红色的起点》《直播开国大典》《三湾,那一夜》等一批话剧作品。
《红色的起点》凸显青春洋溢的革命精神,以富有时代气息的舞台表达,再现中国共产党开天辟地的峥嵘岁月。
《直播开国大典》则聚焦新中国成立这一伟大历史时刻,以历史人物为原型,再现新华广播电台如何在有限条件下,顺利实况转播开国大典,向全世界宣告中华人民共和国的成立。
为了让故事更加好看,在《直播开国大典》中,我们打破传统叙事模式,3条线索交融并进,增强全剧悬念和戏剧冲突,更加有效地传递作品的精神内涵。
今年国庆期间,国家话剧院首部文献剧《抗战中的文艺》成功上演。
全剧以活跃在抗战中的文艺家为主人公,集中呈现鲁迅、田汉、聂耳等文艺大家的爱国之志和救国之举。
国家话剧院推出这部剧,既是对历史的回望和致敬,更传递了前辈艺术家的奋斗之志、家国情怀。
湖南省长沙市2025届高三上学期第二次月考数学试卷含答案
湖南2025届高三月考试卷(二)数学(答案在最后)命题人、审题人:高三数学备课组时量:120分钟满分:150分一、选择题:本题共8小题,每小题5分,共40分.在每小题给出的四个选项中,只有一项是符合题目要求的.1.复数11i z =+的虚部是()A.1 B.12 C.12- D.1-【答案】C【解析】【分析】先化简给定复数,再利用虚部的定义求解即可.【详解】因为()()11i 1i 1i 1i 1i 1i 222z --====-++-,所以其虚部为12-,故C 正确.故选:C.2.已知a 是单位向量,向量b 满足3a b -= ,则b 的最大值为()A.2B.4C.3D.1【答案】B【解析】【分析】设,OA a OB b == ,由3a b -= ,可得点B 在以A 为圆心,3为半径的圆上,利用向量的模的几何意义,可得 b 的最大值.【详解】设,OA a OB b == ,因为3a b -= ,即3OA OB BA -== ,即3AB = ,所以点B 在以A 为圆心,3为半径的圆上,又a 是单位向量,则1OA = ,故OB 最大值为134OA AB +=+= ,即 b 的最大值为4.故选:B.3.已知角θ的终边在直线2y x =上,则cos sin cos θθθ+的值为()A.23- B.13- C.23 D.13【答案】D【解析】【分析】由角θ的终边,得tan 2θ=,由同角三角函数的关系得cos 1sin cos 1tan θθθθ=++,代入求值即可.【详解】因为角θ的终边在直线2y x =上,所以tan 2θ=.所以cos 111sin cos 1tan 123θθθθ===+++.故选:D.4.已知函数()2e 33,0,0x a x f x x a x ⎧+-<=⎨+≥⎩对任意的12,x x ∈R ,且12x x ≠,总满足以下不等关系:()()12120f x f x x x ->-,则实数a 的取值范围为()A.34a ≤ B.34a ≥ C.1a ≤ D.1a ≥【答案】D【解析】【分析】由条件判定函数的单调性,再利用指数函数、二次函数的性质计算即可.【详解】()()()12120f x f x f x x x ->⇒- 在上单调递增,又()2e 33,0,0x a x f x x a x ⎧+-<=⎨+≥⎩,当0x <时,()e 33xf x a =+-单调递增,当0x ≥时,()f x 单调递增,只需1330a a +-≤+,解得1a ≥.故选:D.5.如图,圆柱的母线长为4,,AB CD 分别为该圆柱的上底面和下底面直径,且AB CD ⊥,三棱锥A BCD -的体积为83,则圆柱的表面积为()A.10πB.9π2C.4πD.8π【答案】A【解析】【分析】取AB 的中点O ,由13A BCD OCD V S AB -=⋅△,可求解底面半径,即可求解.【详解】设底面圆半径为r ,由AB CD ⊥,易得BC AC BD AD ===,取AB 的中点O ,连接,OC OD ,则,AB OC AB OD ⊥⊥,又OC OD O,OC,OD =⊂ 平面OCD ,所以AB ⊥平面OCD ,所以,11182423323A BCD OCD V S AB r r -=⋅=⨯⨯⨯⨯= ,解得=1,所以圆柱表面积为22π42π10πr r +⨯=.故选:A.6.已知抛物线()2:20C y px p =>的焦点F 到准线的距离为2,过焦点F 的直线l 与抛物线交于,A B 两点,则23AF BF +的最小值为()A.52+ B.5 C.10 D.11【答案】B【解析】【分析】(方法一)首先求出抛物线C 的方程为24y x =,设直线l 的方程为:1x ty =+,与抛物线C 的方程联立,利用根与系数的关系求出21x x 的值,再根据抛物线的定义知11AF x =+,21BF x =+,从而求出23AF BF +的最小值即可.(方法二)首先求出111AF BF+=,再利用基本不等式即可求解即可.【详解】(方法一)因为抛物线C 的焦点到准线的距离为2,故2p =,所以抛物线C 的方程为24y x =,焦点坐标为1,0,设直线l 的方程为:()()11221,,,,x ty A x y B x y =+,不妨设120y y >>,联立方程241y x x ty ⎧=⎨=+⎩,整理得2440y ty --=,则12124,4y y t y y +==-,故221212144y y x x =⋅=,又B =1+2=1+1,2212p BF x x =+=+,则()()12122321312352525AF BF x x x x +=+++=++≥=,当且仅当12,23x x ==时等号成立,故23AF BF +的最小值为5.故选:B.(方法二)由方法一可得121x x =,则11AF BF +211111x x =+++121212211x x x x x x ++==+++,因此23AF BF +()1123AF BF AF BF ⎛⎫=++ ⎪ ⎪⎝⎭235AF BF BF AF =++55≥+=+,当且仅当661,123AF BF =+=+时等号成立,故23AF BF +的最小值为5.故选:B.7.设函数()()cos f x x ϕ=+,其中π2ϕ<.若R x ∀∈,都有ππ44f x f x ⎛⎫⎛⎫+=- ⎪ ⎪⎝⎭⎝⎭.则()y f x =的图象与直线114y x =-的交点个数为()A.1B.2C.3D.4【答案】C【解析】【分析】利用给定条件求出()πcos 4f x x ⎛⎫=- ⎪⎝⎭,再作出图像求解交点个数即可.【详解】对R x ∀∈,都有ππ44f x f x ⎛⎫⎛⎫+=- ⎪ ⎪⎝⎭⎝⎭,所以π4x =是=的一条对称轴,所以()ππZ 4k k ϕ+=∈,又π2ϕ<,所以π4ϕ=-.所以()πcos 4f x x ⎛⎫=- ⎪⎝⎭,在平面直角坐标系中画出()πcos 4f x x ⎛⎫=-⎪⎝⎭与114y x=-的图象,当3π4=-x 时,3π14f ⎛⎫-=- ⎪⎝⎭,11113π3π4164y --=⨯(-=-<-,当5π4x =时,5π14f ⎛⎫=- ⎪⎝⎭,5π5π14111461y =⨯-=->-,当9π4x =时,9π14f ⎛⎫= ⎪⎝⎭,11119π9π4416y =⨯-=-<,当17π4x =时,17π14f ⎛⎫= ⎪⎝⎭,111117π17π4416y =⨯-=->所以如图所示,可知=的图象与直线114y x =-的交点个数为3,故C 正确.故选:C.8.已知定义域为R 的函数()(),f x g x 满足:()()()()()()00,g f x g y f y g x f x y ≠-⋅=-,且()()()()()g x g y f x f y g x y -=-,则下列说法正确的是()A.()01f =B.()f x 是偶函数C.若()()1112f g +=,则()()2024202420242f g -=-D.若()()111g f -=,则()()202420242f g +=【答案】C【解析】【分析】对A ,利用赋值法令0,0x y ==即可求解;对B ,根据题中条件求出()f y x -,再利用偶函数定义即可求解;对C ,先根据题意求出()()001f g -=-,再找出()()11f x g x ---与()()f x g x ⎡⎤-⎣⎦的关系,根据等比数列的定义即可求解;对D ,找出()()11f x g x -+-与()()f x g x ⎡⎤+⎣⎦的关系,再根据常数列的定义即可求解.【详解】对A ,()()()()()f x g y f y g x f x y -⋅=- ,令0,0x y ==,即()()()()()00000f g f g f -⋅=,解得()00f =,故A 错;对B ,根据()()()()()f x g y f y g x f x y -=-,得()()()()()f y g x f x g y f y x -=-,即()()f y x f x y -=--,故()f x 为奇函数,故B 错;对C ,()()()()()g x g y f x f y g x y -=- 令0x y ==,即()()()()()00000g g f f g -=,()00f = ,()()200g g ∴=,又()00g ≠,()01g ∴=,()()001f g ∴-=-,由题知:()()f x yg x y ---()()()()()()()()f x g y f y g x g x g y f x f y ⎡⎤=-⋅--⎣⎦()()()()f y g y f x g x ⎡⎤⎡⎤=+-⎣⎦⎣⎦,令1y =,即()()()()()()1111f x g x f g f x g x ⎡⎤⎡⎤---=+-⎣⎦⎣⎦,()()1112f g += ,()()()()1112f xg x f x g x ⎡⎤∴---=-⎣⎦,即()(){}f xg x -是以()()001f g -=-为首项2为公比的等比数列;故()()()2024202420242024122f g -=-⨯=-,故C 正确;对D ,由题意知:()()f x yg x y -+-()()()()()()()()f xg y f y g x g x g y f x f y =-⋅+-()()()()g y f y f x g x ⎡⎤⎡⎤=-+⎣⎦⎣⎦,令1y =,得()()()()()()1111f x g x g f f x g x ⎡⎤⎡⎤-+-=-+⎣⎦⎣⎦,又()()111g f -=,即()()()()11f x g x f x g x -+-=+,即数列()(){}f xg x +为常数列,由上知()()001f g +=,故()()202420241f g +=,故D 错.故选:C.【点睛】关键点点睛:本题的关键是对抽象函数进行赋值,难点是C ,D 选项通过赋值再结合数列的性质进行求解.二、多选题:本题共3小题,每小题6分,共18分.在每小题给出的选项中,有多项符合题目要求.全部选对的得6分,部分选对的得部分分,有选错的得0分.9.下列说法中正确的是()A.一个样本的方差()()()22221220133320s x x x ⎡⎤=-+-++-⎣⎦L ,则这组样本数据的总和等于60B.若样本数据1210,,,x x x 的标准差为8,则数据1221,21,x x -- ,1021x -的标准差为16C.数据13,27,24,12,14,30,15,17,19,23的第70百分位数是23D.若一个样本容量为8的样本的平均数为5,方差为2,现样本中又加入一个新数据5,此时样本容量为9,平均数不变,方差变小【答案】ABD【解析】【分析】对于A ,由题意可得样本容量为20,平均数是3,从而可得样本数据的总和,即可判断;对于B ,根据标准差为8,可得方差为64,从而可得新数据的方差及标准差,即可判断;对于C ,根据百分位数的定义,求出第70百分位数,即可判断;对于D ,由题意可求得新数据的平均数及方差,即可判断.【详解】解:对于A ,因为样本的方差()()()222212201333,20s x x x ⎡⎤=-+-++-⎣⎦ 所以这个样本有20个数据,平均数是3,这组样本数据的总和为32060,⨯=A 正确;对于B ,已知样本数据1210,,,x x x 的标准差为8s =,则264s =,数据121021,21,,21x x x --- 的方差为2222264s =⨯2816=⨯=,故B 正确;对于C ,数据13,27,24,12,14,30,15,17,19,23共10个数,从小到大排列为12,13,14,15,17,19,23,24,27,30,由于100.77⨯=,故选择第7和第8个数的平均数作为第70百分位数,即232423.52+=,所以第70百分位数是23.5,故C 错误;对于D ,某8个数的平均数为5,方差为2,现又加入一个新数据5,设此时这9个数的平均数为x ,方差为2S ,则2285582(55)165,2999x S ⨯+⨯+-====<,故D 正确.故选:ABD.10.已知函数()32f x ax bx =-+,则()A.()f x 的值域为RB.()f x 图象的对称中心为()0,2C.当30b a ->时,()f x 在区间()1,1-内单调递减D.当0ab >时,()f x 有两个极值点【答案】BD【解析】【分析】利用一次函数、三次函数的性质结合分类讨论思想可判定A ,利用函数的奇偶性判定B ,利用导数研究函数的单调性结合特殊值法排除C ,利用极值点的定义可判定D.【详解】对于A :当,a b 至少一个不为0,则()f x 为三次或者一次函数,值域均为;当,a b 均为0时,值域为{}2,错误;对于B :函数()()32g x f x ax bx =-=-满足()()3g x ax bx g x -=-+=-,可知()g x 为奇函数,其图象关于()0,0中心对称,所以()f x 的图象为()g x 的图象向上移动两个单位后得到的,即关于0,2中心对称,正确;对于C :()23f x ax b '=-,当30b a ->时,取1,1a b =-=-,当33,33x ⎛⎫∈- ⎪ ⎪⎝⎭时,()()2310,f x x f x =-+>'在区间33,33⎛⎫- ⎪ ⎪⎝⎭上单调递增,错误;对于D :()23f x ax b '=-,当0ab >时,()230f x ax b '=-=有两个不相等的实数根,所以函数()f x 有两个极值点,正确.故选:BD.11.我国古代太极图是一种优美的对称图.定义:能够将圆O 的周长和面积同时等分成两个部分的函数称为圆O 的一个“太极函数”,则下列命题中正确的是()A.函数()sin 1f x x =+是圆22:(1)1O x y +-=的一个太极函数B.对于圆22:1O x y +=的所有非常数函数的太极函数中,都不能为偶函数C.对于圆22:1O x y +=的所有非常数函数的太极函数中,均为中心对称图形D.若函数()()3f x kx kx k =-∈R 是圆22:1O x y +=的太极函数,则()2,2k ∈-【答案】AD【解析】【分析】根据题意,对于A ,D 利用新定义逐个判断函数是否满足新定义即可,对于B ,C 举反例说明.【详解】对于A ,圆22:(1)1O x y +-=,圆心为0,1,()sin 1f x x =+的图象也过0,1,且0,1是其对称中心,所以()sin 1f x x =+的图象能将圆一分为二,所以A 正确;对于B,C ,根据题意圆22:1O x y +=,如图()331,332313,03231332331,332x x x f x x x x ⎧--<-⎪⎪+-≤≤=⎨⎪+<≤⎪->⎩,与圆交于点()1,0-,1,0,且在x 轴上方三角形面积与x 轴下方个三角形面积之和相等,()f x 为圆O 的太极函数,且()f x 是偶函数,所以B ,C 错误;对于D ,因为()()()()()33()f x k x k x kx kx f x k -=---=--=-∈R ,所以()f x 为奇函数,由()30f x kx kx =-=,得0x =或1x =±,所以()f x 的图象与圆22:1O x y +=的交点为()()1,0,1,0-,且过圆心()0,0,由3221y kx kx x y ⎧=-⎨+=⎩,得()2624222110k x k x k x -++-=,令2t x =,则()232222110k t k t kt -++-=,即()()222110t k t k t --+=,得1t =或22210k t k t -+=,当1t =时,1x =±,当22210k t k t -+=时,若0k =,则方程无解,合题意;若0k ≠,则()4222Δ44k k k k=-=-,若Δ0<,即204k <<时,方程无解,合题意;所以()2,2k ∈-时,两曲线共有两个交点,函数能将圆一分为二,如图,若Δ0=,即2k =±时,函数与圆有4个交点,将圆分成四部分,若Δ0>,即24k >时,函数与圆有6个交点,且均不能把圆一分为二,如图,所以()2,2k ∈-,所以D 正确.故选:AD.【点睛】关键点点睛:本题解题的关键是理解新定义,即如果一个函数过圆心,并且函数图象关于圆心中心对称,且函数将圆分成2部分,不能超过2部分必然合题.如果函数不是中心对称图形,则考虑与圆有2个交点,交点连起来过圆心,再考虑如何让面积相等.三、填空题:本题共3小题,每小题5分,共15分.12.曲线2ln y x x =-在点()1,2处的切线与抛物线22y ax ax =-+相切,则a =__________.【答案】1【解析】【分析】求出曲线2ln y x x =-在点()1,2处的切线方程,由该切线与抛物线22y ax ax =-+相切,联立消元,得到一元二次方程,其Δ0=,即可求得a .【详解】由2ln y x x =-,则12y x'=-,则11x y ='=,曲线2ln y x x =-在点()1,2处的切线方程为21y x -=-,即1y x =+,当0a ≠时,则212y x y ax ax =+⎧⎨=-+⎩,得()2110ax a x -++=,由2Δ(1)40a a =+-=,得1a =.故答案为:1.13.已知椭圆G22+22=1>>0的左、右焦点分别为12,F F ,若P 为椭圆C 上一点,11212,PF F F PF F ⊥ 的内切圆的半径为3c,则椭圆C 的离心率为______.【答案】23【解析】【分析】由内切圆半径的计算公式,利用等面积法表示焦点三角形12PF F 的面积,得到,a c 方程,即可得到离心率e 的方程,计算得到结果.【详解】由题意,可知1PF 为椭圆通径的一半,故21b PF a =,12PF F 的面积为21122b cc PF a⋅⋅=,又由于12PF F 的内切圆的半径为3c,则12PF F 的面积也可表示为()12223c a c +⋅,所以()111222223c c PF a c ⋅⋅=+⋅,即()212223b c ca c a =+⋅,整理得:22230a ac c --=,两边同除以2a ,得2320e e +-=,所以23e =或1-,又椭圆的离心率()0,1e ∈,所以椭圆C 的离心率为23.故答案为:23.14.设函数()()44xf x ax x x =+>-,若a 是从1,2,3,4四个数中任取一个,b 是从4,8,12,16,20,24六个数中任取一个,则()f x b >恒成立的概率为__________.【答案】58##0.625【解析】【分析】根据题意,利用基本不等式,求得2min ()1)f x =+,转化为21)b +>恒成立,结合a 是从1,2,3,4四个数中任取一个,b 是从4,8,12,16,20,24六个数中任取一个,得到基本事件总数有24个,再利用列举法,求得()f x b >成立的基本事件的个数,结合古典概型的概率计算公式,即可求解.【详解】因为0,4a x >>,可得40x ->,则()()441441444x f x ax ax a x a x x x =+=++=-+++---2411)a ≥++=,当且仅当4x =时,等号成立,故2min ()1)f x =+,由不等式()f x b >恒成立转化为21)b >恒成立,因为a 是从1,2,3,4四个数中任取一个,b 是从4,8,12,16,20,24六个数中任取一个,则构成(),a b 的所有基本事件总数有24个,又由()221)1)912,16==+,()221)1319,201)25+=+=,设事件A =“不等式()f x b >恒成立”,则事件A 包含事件:()()1,4,1,8,()()()2,4,2,8,2,12,()()()()3,4,3,8,3,12,3,16,()()()()()()4,4,4,8,4,12,4,16,4,20,4,25共15个,因此不等式()f x b >恒成立的概率为155248=.故答案为:58.四、解答题:本题共5小题,共77分.解答应写出文字说明、证明过程或演算步骤.15.在ABC V 中,角,,A B C 所对的边分别为,,a b c ,已知()()()sin sin sin b c B C a c A +-=-.(1)求B ;(2)若ABC 的面积为334,且2AD DC = ,求BD 的最小值.【答案】(1)π3B =(2.【解析】【分析】(1)利用正弦定理可得()()()b c b c a c a +-=-,再结合余弦定理得2221cos 22a cb B ac +-==,从而可求解.(2)结合ABC V 的面积可求得3ac =,再由.112333BD BC CA BA BC =+=+,平方后得,()222142993BD c a =++ ,再结合基本不等式即可求解.【小问1详解】由正弦定理得()()()b c b c a c a +-=-,即222a c b ac +-=,由余弦定理可得2221cos 222a cb ac B ac ac +-===,因为()0,πB ∈,所以π3B =.【小问2详解】因为ABC V 的面积为33π,43B =,所以133sin 24ac B =,所以3ac =.因为()11123333BD BC CA BC BA BC BA BC =+=+-=+,所以()()()()22222221421441422cos 999999993BD BA BC BA BC c a ac B c a =++⋅⋅=++=++ ,所以2214212222993333c a c a ++≥⋅⋅+=,当且仅当6,2a c ==时取等号,所以BD .16.已知双曲线E 的焦点在x 轴上,离心率为233,点(在双曲线E 上,点12,F F 分别为双曲线的左、右焦点.(1)求E 的方程;(2)过2F 作两条相互垂直的直线1l 和2l ,与双曲线的右支分别交于A ,C 两点和,B D 两点,求四边形ABCD 面积的最小值.【答案】(1)2213x y -=(2)6【解析】【分析】(1)由222c a b =+和3e =,及点(在双曲线E 上,求出22,a b ,即可求出E 的方程;(2)设直线()()121:2,:2l y k x l y x k =-=--,其中0k ≠,根据题中条件确定2133k <<,再将1l 的方程与2213x y -=联立,利用根与系数的关系,用k 表示AC ,BD 的长,再利用12ABCDS AC BD =,即可求出四边形ABCD 面积的最小值.【小问1详解】因为222c a b =+,又由题意得22243c e a ==,则有223a b =,又点(在双曲线E 上,故229213-=b b,解得221,3b a ==,故E 的方程为2213xy -=.【小问2详解】根据题意,直线12,l l 的斜率都存在且不为0,设直线()()121:2,:2l y k x l y x k=-=--,其中0k ≠,因为12,l l 均与E 的右支有两个交点,所以313,33k k >->,所以2133k <<,将1l 的方程与2213x y -=联立,可得()222213121230k x k x k -+--=.设()()1122,,,A x y C x y ,则2212122212123,1313k k x x x x k k---+==--,所以()222121212114AC k x k x x x x =+-=++-)22222222222311212323114113133113k k k kkk k k k k +⎛⎫---+=+-⨯+ ⎪----⎝⎭,同理)22313k BD k +=-,所以))()()()2222222223131111622313313ABCD kkk S AC BD k kkk+++==⋅⋅=⋅----.令21t k =+,所以241,,43k t t ⎛⎫=-∈⎪⎝⎭,则2222166661616316161131612ABCDt S t t t t t =⋅=⋅=≥-+-⎛⎫-+---+ ⎪⎝⎭,当112t =,即1k =±时,等号成立.故四边形ABCD 面积的最小值为6.17.如图,侧面11BCC B 水平放置的正三棱台11111,24ABC A B C AB A B -==,2,P 为棱11A B 上的动点.(1)求证:1AA ⊥平面11BCC B ;(2)是否存在点P ,使得平面APC 与平面111A B C 的夹角的余弦值为53333?若存在,求出点P ;若不存在,请说明理由.【答案】(1)证明见解析(2)存在,点P 为11A B 中点【解析】【分析】(1)延长三条侧棱交于一点O ,由勾股定理证明OA OB ⊥,OA OC ⊥,根据线面垂直的判定定理得证;(2)建立空间直角坐标系,求出平面111A B C 和平面APC 的法向量,利用向量夹角公式求解.【小问1详解】延长三条侧棱交于一点O ,如图所示,由于11124,2AB A B BB ===22OB OA ==所以22216OA OB AB +==,所以OA OB ⊥,同理OA OC ⊥.又OB OC O = ,,OB OC ⊂平面OBC ,所以OA ⊥平面OBC ,即1AA ⊥平面11BCC B .【小问2详解】由(1)知,,OA OB OA OC OB OC ⊥⊥⊥,如图建立空间直角坐标系,则(()0,0,,0,A C,()()111,,0,A B C ,所以((1110,0,,0,,AA AC A B ==-=,()110,B C =.设)111,0,A P A B λλ===,则1AP AA =+)[]1,0,,0,1A P λ=∈,设平面111A B C 和平面APC 的法向量分别为(),,,m x y z n ==(),,r s t ,所以)01000r t λ⎧=+=⎪⎨+==⎪⎪⎩⎩,取()()1,1,1,1,,m n λλλ==+,则cos ,33m n m n m n ⋅===.整理得212870λλ+-=,即()()21670λλ-+=,所以12λ=或76λ=-(舍),故存在点P (点P 为11A B 中点时),满足题意.18.若无穷正项数列{}n a 同时满足下列两个性质:①存在0M >,使得*,n a M n <∈N ;②{}n a 为单调数列,则称数列{}n a 具有性质P .(1)若121,3nn n a n b ⎛⎫=-= ⎪⎝⎭,(i )判断数列{}{},n n a b 是否具有性质P ,并说明理由;(ii )记1122n n n S a b a b a b =+++ ,判断数列{}n S 是否具有性质P ,并说明理由;(2)已知离散型随机变量X 服从二项分布()1,,02B n p p <<,记X 为奇数的概率为n c .证明:数列{}n c 具有性质P .【答案】(1)(i )数列{}n a 不具有性质P ,数列{}n b 具有性质P ,理由见解析;(ii )数列{}n S 具有性质P ,理由见解析(2)证明见解析【解析】【分析】(1)判断数列是否满足条件①②,可得(i )的结果;利用错位相减法求数列{}n n a b 的前n 项和,再判断是否满足条件①②.(2)先求数列{}n c 的通项公式,再判断是否满足条件①②.【小问1详解】(i )因为21n a n =-单调递增,但无上限,即不存在M ,使得n a M <恒成立,所以数列不具有性质P .因为113nn b ⎛⎫=< ⎪⎝⎭,又数列为单调递减数列,所以数列具有性质P .(ii )数列{}n S 具有性质P .2112113333n n n S -=⋅+⋅++ ,23111121133333n n n S +-=⋅+⋅++ ,两式作差得23121111211222333333n n n n S +-=⋅+⋅+⋅++⋅- ,即1121121212223313333313n n n n n n S ++⎛⎫- ⎪-+⎝⎭=-+-=--,所以111,3n n n S +=-<∴数列{}n S 满足条件①.(){}11210,,3nn n n n n a b n S S S +⎛⎫=->∴<∴ ⎪⎝⎭为单调递增数列,满足条件②.综上,数列{}n S 具有性质P .【小问2详解】因为*0,1,,,X n n =∈N ,若X 为奇数的概率为,n c X 为偶数的概率为n d ,()1[1]nn n c d p p +==-+001112220C (1)C (1)C (1)C (1)n n n n nn n n n p p p p p p p p --=-+-+-++- ①()001112220[1]C ()(1)C ()(1)C ()(1)C ()(1)n n n n n n n n n n p p p p p p p p p p ----=--+--+--++-- ②,2n c -=①②,即1(12)2nn p c --=.所以当102p <<时,0121p <-<,故n c 随着n 的增大而增大,且12n c <.故数列{}n c 具有性质P .19.已知函数()24e 2x f x x x-=-,()2233g x x ax a a =-+--(a ∈R 且2a <).(1)令()()()(),x f x g x h x ϕ=-是()x ϕ的导函数,判断()h x 的单调性;(2)若()()f x g x ≥对任意的()1,x ∈+∞恒成立,求a 的取值范围.【答案】(1)ℎ在(),0∞-和0,+∞上单调递增;(2)(],1-∞.【解析】【分析】(1)需要二次求导,利用导函数的符号分析函数的单调性.(2)法一先利用()()22f g ≥这一特殊情况,探索a 的取值范围,再证明对()1,x ∈+∞时,()()f x g x ≥恒成立;法二利用导数工具求出函数()x ϕ的最小值()0x ϕ,同法一求证(]0,1a ∈时()00x ϕ≥,接着求证()1,2a ∈时()20ϕ<不符合题意即可得解.【小问1详解】()()()2224e 233x x f x g x x x ax a a xϕ-=-=-+-++,定义域为{}0xx ≠∣,所以()()()224e 1223x x h x x x a xϕ--==-+-',所以()()2234e 2220x x x h x x --+=+>'.所以()h x 在(),0-∞和()0,∞+上单调递增.【小问2详解】法一:由题知()()22f g ≥即()()()2232120a a a a ϕ=-+=--≥,即1a ≤或2a ≥,所以1a ≤.下证当1a ≤时,()()f x g x ≥对任意的()1,x ∈+∞恒成立.令()()24e x F x f x x x x -=+=-,则()()()()()222234e 224e 11,0x x x x x F x t x t x x x---+-'=-==>',所以()()224e 11x x F x x --=-'在()1,+∞单调递增,又()20F '=,所以当()1,2x ∈时,()()0,F x F x '<单调递减,当()2,x ∈+∞时,()()0,F F x x '>递单调增,所以()()20F x F ≥=,故()f x x ≥-,要证()()f x g x ≥,只需证()x g x -≥,即证()223130x a x a a -+++≥,令()()22313G x x a x a a =-+++,则()()()222Δ(31)43561151a a a a a a a =+-+=-+=--,若115a ≤≤,则0∆≤,所以()()223130G x x a x a a =-+++≥.若15a <,则对称轴31425a x +=<,所以()G x 在()1,+∞递增,故()()210G x G a >=≥,综上所述,a 的取值范围为(],1-∞.法二:由题知2224e 233x x x ax a a x--≥-+--对任意的()1,x ∈+∞恒成立,即()2224e 2330x x x x ax a a xϕ-=-+-++≥对任意的()1,x ∈+∞恒成立.由(1)知()()224e 1223x x x x a x ϕ--=-+-'在()1,+∞递增,又()13a ϕ'=-.①若0a ≤,则()()()10,x x ϕϕϕ'>≥'在()1,+∞递增,所以()()24110e x a ϕϕ>=-+>,符合;②若0a >,则()130a ϕ=-<',又()112224e 14e (1)(1)(1)a a a a a a a a a ϕ--⎡⎤+=-=-+⎣⎦++',令()124e(1)a m a a -=-+,则()()()14e 21a m a a h a -=-+=',则()14e 2a h a -'=-为单调递增函数,令()0h a '=得1ln2a =-,当()0,1ln2a ∈-时()()0,h a m a ''<单调递减,当()1ln2,a ∞∈-+时()()0,h a m a ''>单调递增,又()()10,00m m ='<',所以当()0,1a ∈时,()()0,m a m a '<单调递减,当()1,a ∈+∞时,()()0,m a m a '>单调递增,所以()()10m a m ≥=,则()12214e (1)0(1)a a a a a ϕ-⎡⎤+'=-+≥⎣⎦+,所以(]01,1x a ∃∈+,使得()00x ϕ'=,即()0200204e 12230x x x a x ---+-=,且当()01,x x ∈时,()()0,x x ϕϕ'<单调递减,当()0,x x ∈+∞时,()()0,x x ϕϕ'>单调递增,所以()()0222min 000004e 233x x x x x ax a a x ϕϕ-==-+-++.若(]0,1a ∈,同法一可证()0222000004e 2330x x x x ax a a x ϕ-=-+-++≥,符合题意.若()1,2a ∈,因为()()()2232120a a a a ϕ=-+=--<,所以不符合题意.综上所述,a 的取值范围为(],1-∞.【点睛】方法点睛:导数问题经常会遇到恒成立的问题.常见的解决思路有:(1)根据参变分离,转化为不含参数的函数最值问题.(2)若()0f x >恒成立,就可以讨论参数不同取值下的函数的单调性和极值与最值,最终转化为()min 0f x >;若()0f x <⇔()max 0f x <.(3)若()()f x g x ≥恒成立,可转化为()()min max f x g x ≥(需在同一处取得最值).。
第二次月考达标测评卷(5-6单元)(试卷)(含答案) 2024-2025学年冀教版数学六年级上册
六年级数学上第二次月考达标测评卷第5-6单元时间: 60分钟分数: 100分题号一二三四五六总分得分一、填空。
(每空1 分,共20分)1.()÷8=15( )=0.75=()%=( )(填成数)2.某商场这个月的营业额为250000元,如果按营业额的5%缴纳营业税,则这个月应缴纳营业税款( )元。
3.按七五折出售就是按原价的( )%出售,二五折就是( )%。
4.(1)图①各边放大到原来的( )倍后是图④?(2)图⑥是图( )各边放大后的图形。
(3)图③各边缩小到原来的12后是图( )5.为了计算简便,通常把比例尺写成前项或后项为( )的比。
6.在比例尺中,图上1厘米相当于实际距离( )千米,化成数值比例尺是( )。
7.一种服装原来卖m元,现价比原价提高40%,现价是( )元。
8.去年我国国内生产总值是前年的111.8%,去年我国的国内生产总值比前年增长( )%。
9.一种矿泉水,零售每瓶2元,商场为感谢广大顾客对该新产品的厚爱,特开展“买四赠一”大酬宾活动,活动期间矿泉水的价格优惠了( )%。
10.小丽去年身高105厘米,今年长高了5厘米,今年比去年高了( )%。
11.家电下乡活动期间,赵叔叔买了一台冰箱,冰箱的售价是2800元,政府补贴13%,赵叔叔实际付了( )元。
12.某小学书法组有48人,比音乐组多20%,音乐组有( )人。
13.把50000米的距离画在比例尺是1:200000的地图上,应画( )厘米。
二、判断。
(正确的打“✔”,错误的打“×”)(10分)1.一种商品,第一次降价10%,第二次按现价的九五折出售,这时该商品的价格是原价的85.5%。
( )2. 一吨煤.运走 40%,还剩60%吨。
( )3.甲数比乙数小40%,则甲、乙两数的比是3:5。
( )4.图上距离一定比实际距离小。
( )5.将一个长2毫米的零件画在图纸上长10厘米,这幅图的比例尺是1:50。
( )三、选择。
天津市耀华中学2023-2024学年高三上学期第二次月考(11月)历史试题
天津市耀华中学2024届高三年级第二次月考历史试卷(本试卷考试时间 60分钟,总分 100分)第Ⅰ 卷选择题注意事项:1.每题选出答案后,用铅笔将答题卡上对应题目的答案标号涂黑。
如需改动,用橡皮擦干净后,再选涂其他答案标号。
2.本卷共15题,每题3分,共45分。
在每题给出的四个选项中,只有一项是最符合题目要求的。
1.2.辽、夏、金三朝科举以经史、文学为考试内容,北方的少数民族士子通过学习儒家文化,萌生并强化了“懂礼即中国”、“用中国之礼则中国之”的观念。
由此可知,科举制在北方推行A. 解决了各民族之间矛盾B. 加快了文化重心的转移C. 传播了“大一统”思想D. 促进了经济文化的交流高三年级历史试卷第 1 页共 8 页3. 曾有人向王锡爵(明代万历年间的内阁首辅)传言:“上久不乐接士大夫……今幸有知公之一线,好在将顺,切勿自断其线头。
”这表明,当时A. 宰相参政议政职能得到强化B. 中央集权得到了进一步巩固C. 六部已成为内阁的下属机构D. 阁臣起沟通皇帝和外廷作用4. 雍正朝开辟贵州东南苗疆后,当地人开始以汉族“六礼”的程序来实现婚姻的缔结,且逐渐形成“文字凭据”的观念。
地方政府在基层社会的代理人,积极参与人们婚姻的缔结与变动,婚姻监督与监管权从亲属向政府地方代理人转换。
这一现象表明A. 朝廷重视改土归流成效B. 政府行为推动民族融合C. 国家权力渗入边疆治理D. 儒家思想强化婚姻观念5. 清代前期,湖南湘乡县农民“收早稻后,又种迟薯,山农以此充食,岁居大半”;四川资阳县农民“多种薯以为食,省谷出粜”;在台湾,“人皆食地瓜,大米之产,全为贩运,以资财用。
”出现这一现象表明当时A. 高产农作物推广提高了粮食总量B. 农产品商品化有所增强C. 农民经营各种副业提高家庭收入D. 红薯已成主要的农作物6.1793年,清政府颁布《钦定藏内善后章程》。
它为整顿西藏吏治,治理西藏政务制定了一系列措施,对驻藏大臣职权、官吏制度、军事防务、外事交涉、宗教管理等诸多方面都作出了详细规定。
江苏省南通市2023-2024学年九年级上学期第二次月考数学试卷(含答案)
江苏省南通市2023-2024学年九年级上学期第二次月考数学试卷一、选择题(本大题共10小题,每小题3分,共计30分,在每小题给出的四个选项中恰有一项是符合题目要求的)1.下列各点中,在反比例函数的图象上的是( )4y x =A. B. C. D.(14)--,(14)-,(2)-,2(2),-22.将抛物线向右平移2 个单位长度,再向下平移5 个单位长度,平移后的抛物线的2y x =解析式为( )A. B. C. D.2(2)5y x =+-2(2)5y x =++2(2)5y x =--2(2)5y x =-+3.如图,O 的半径为10,弦AB=16,点 M 是弦 AB 上的动点且点 M 不与点A 、B 重⊙合,则OM 的长不可能是( )A.5B.6C.8D.94.如图,等腰直角三角板ABC 的斜边AB 与量角器的直径重合,点D 是量角器上 120° 刻度线的外端点,连接CD 交AB 于点E ,则∠CEB 的度数是( )A.100°B.105°C.110°D.120°5.正方形网格中,如图放置,则=( )AOB ∠sin AOB ∠C. D.1226.如图,直线,直线m 、n 分别与直线a ,b ,c 相交于点A ,B ,C 和点D ,E ,F ,a ∥b ∥c 若AB =2,AC =5,DE =3,则EF =( )A.2.5B.4C.4.5D.7.57.已知点,,都在反比例函数的图象上,则,A (−4,y 1)B (−2,y 2)C (3,y 3)(0)ky k x =>y 1,的大小关系为( )y 2y 3 A. B. C. D.y 3<y 2<y 1y 2<y 3<y 1y 3<y 1<y 2y 2<y 1<y 38.如图,点D 在△ABC 的边AC 上,添加一个条件,不能判断△ABC 与△BDC 相似的是( )A.∠CBD =∠AB.C.∠CBA =∠C DBD.BC CD AC AB =BC CD AC BC=9.如图,∠B 的平分线 BE 与 BC 边上的中线 AD 互相垂直,并且 BE =AD =4,则BC 值为()A.7B.C. 6D.10.如图,菱形OABC 的一边OA 在x 轴的负半轴上,O 是坐标原点,A 点坐标为,50-(,)对角线 AC 和 OB 相交于点D ,且AC OB =40.若反比例函数的图象经过 ∙(0)k y x x =<点D ,并与BC 的延长线交于点E ,则值等于()CDE S ∆A. 2 B.1.5 C.1 D.0.5二、(本大题共8小题,第11~12每小题3分,13~18每小题4分,共30分)11.抛物线y =2(x +1)2 +3的顶点坐标是.12.在Rt △ABC 中,∠C =90°,AC =5,BC =4,则tanA=.13.正八边形的中心角是 度.14.圆锥的底面半径是3,母线长为4,则圆锥的侧面积为.15.如图,△ABC 和△DEF 是以点O 为位似中心的位似图形,若 OA ∶AD =2∶3,则△ABC 与DEF 的面积比是 .16.如图,有一个测量小玻璃管口径的量具ABC ,AB 的长为18 mm ,AC 被分为60 等份.如果小玻璃管口径DE正好对应量具上20 等份处(DE ∥AB ),那么小玻璃管口径DE = mm.17. 已知,,若 m ≤n ,则实数 a 的23236m n a +=++22324m n a +=++值为.18. 线段AB =,M 为AB 的中点,动点 P 到点 M 的距离是1,连接 PB ,线段 PB绕点P 逆 时针旋转 90° 得到线段 PC ,连接 AC ,则线段 AC 长度的最小值是.三、解答题(本大题共8小题,共90分.请在答题卡指定区域内作答,解答题应写出文字说明、证明过程或演算步骤)(1)计算:tan45°﹣sin30°cos60°﹣cos 245°;(2)如图,在Rt △ABC 中,∠C =90°,AC ,BC ,解这个直角三角形.20.(本小题满分10分)如图,是三角形的外接圆,是的直径,AD ⊥BC 于点E .O ABC AD O (1)求证:;BAD CAD ∠=∠(2)若长为8,,求的半径长.BC 2DE =O 21.(本小题满分10分)如图,在平面直角坐标系 xOy 中,直线 y =2x +b 经过点 A (-2,0)与 y 轴交于点 B ,与反比例函数的图象交于点 C (m ,6),过 B 作 BD ⊥y 轴,交反比例函数(0)k y x x =>的图象于点D .连接AD 、CD .(0)k y x x=>(1)b =,k =,不等式 >2x +b (x >0)的解集是;k x(2)求△ACD 的面积.如图,在△ABC中,∠C=90°,∠ABC的平分线BD交AC于点D,DE⊥BD,交AB于点E,(1) 求证:△ADE∽△ABD;(2)若AB=10,BE=3AE,求线段AD长.23.(本小题满分12分)如图,AB为⊙O的直径,C为⊙O上一点,AD和过点C的切线互相垂直,垂足为D,(1)求证:AC平分∠BAD;(2)若∠BAD=60°,AB=4,求图中阴影部分的面积.24.(本小题满分12分)某商品进货价为每件40 元,将该商品每件的售价定为50 元时,每星期可销售250 件.现在计划提高该商品的售价增加利润,但不超过58 元.市场调查反映:若该商品每件的售价在50元基础上每上涨1元,其每星期的销售量减少10 件.设该商品每件的售价上涨x元(x为整数且x≥0)时,每星期的销售量为y 件.(1)求y与x之间的函数解析式;(2)当该商品每件的售价定为多少元时,销售该商品每星期获得的利润最大?最大利润是多少?(3)若该商品每星期的销售利润不低于3000 元,求商品售价上涨x元的取值范围.在矩形ABCD 中,AB <BC ,AB =6,E 是射线CD 上一点,点C 关于BE 的对称点F 恰好落在射线DA 上.如图,当点 E 在CD 边上时,①若BC =10,DF 的长为;②若AF ·FD =9时,求 DF 的长;(2)作∠ABF 的平分线交射线 DA 于点M ,当 时,求 DF 的长.12MF BC =26.(本小题满分13分)在平面直角坐标系中,如果一个点的纵坐标比横坐标大k ,则称该点为“k 级差值点”.例如,(1,4)为“3级差值点” ,(﹣3,2)为“5级差值点”.(1) 点(x ,y )是“4级差值点”,则y 与x 的函数关系式是;(2) 若反比例函数的图象上只有一个“k 级差值点”(﹣3≤ k ≤2),t =4m +2k +4,求t 的取m y x=值范围;(3) 已知直线l : y =nx +3与抛物线y =a (x ﹣h )²+h +3交于A ,B 两点,且AB ≥3.若 k ≠3时,2直线 l 上无“k 级差值点”,求a 的取值范围.答案一、选择题1. A2. C3.A4.B4.B5.B6.C7.D8.B9.D 10.C二填空题、11. (-1,3)12.4 513. 4514. 12π15. 4∶2516.1218.三、解答题(本大题共8小题,共90分.请在答题卡指定区域内作答,解答题应写出文字说明、证明过程或演算步骤)19.(本小题满分10分)(1)计算:tan45°﹣sin30°cos60°﹣cos 245°;解:原式= (2)分211122-⨯-…………………………………………………………………… 4分11142=--…………………………………………………………………… 5分14=(2)解:在在Rt △ABC 中,∠C =90°………………………………………………………… 7分∴∠A =60°…………………………………………………………………… 8分∠B =90°-∠A =90°-60°=30°………………………………………………… 9分 (10)分2AB AC ==20.(本小题满分10分)解:(1)∵AD 是的 ⊙O 直径∵AD ⊥BC∴弧BD =弧CD ,…………………………………… 2分∴∠BAD =∠CAD …………………………………… 4分C BAtan BC A AC ==(2) 连接OC∵AD 是的 ⊙O 直径∵AD ⊥BC∴CE =BE =BC…………………………………… 5分12∵BC =8∴CE =4…………………………… 6分在Rt △OEC 中,由勾股定理得,222OE EC OC +=设圆的半径长为r ,∵DE =2∴…………………8分222(2)4r r -+=∴5r =∴⊙O 的半径长为5…………………10分21.(本小题满分10分)(1) b =4,k =6,0<x<1…………………6分 (2)在y =2x +4中,令x =0,则y =4,∴B (0,4) ,在中,令y =4则x =1.56(0)y x x=>∴ D (1.5,4),∴BD =1.5…………………8分∴S △ACD =S △ABD +S △BCD ==…………………10分111.54 1.56422⨯⨯+⨯⨯-()9222.(本小题满分10分)(1)证明:∵BD 是∠ABC 的平分线∴∠ABD =∠DBC……………………………1分∵DE ⊥BD∴∠BDE =90°∵∠C =90°∴∠ADE + ∠BDC =90°,∠CBD +∠BDC =90°∴∠CBD = ∠ADE ……………………………………3分∴∠ADE = ∠ABD ……………………………………4分又∵∠A =∠A∴△ADE ∽△ABD ………………………………5分(2)解:∵AB =10,BE =3AE∴AE =2.5,BE =7.5………………………………6分由(1)得△ADE ∽△ABD ,∴………………………………8分AD AE AB AD∴AD 2=AB ·AE =10×2.5=25∴AD =5∴线段AD 长为5.………………………………10分23. (本小题满分12分)(1)证明:如图1,连接OC ,∵CD 为⊙O 切线,∴OC ⊥CD………………………………1分∵AD ⊥CD∴OC // AD ………………………………2分∴∠OCA =∠CAD , ………………………………3分又∵OA =OC∴∠OCA =∠OAC ………………………………4分∴∠CAD =∠OAC ,………………………………5分∴AC 平分∠DAB . ………………………………6分(2)解:如图所示,过点O 作OE ⊥AC 于点E ,则AE =EC =AC ,12∵∠BAD =60°,AC 平分∠DAB∴∠CAB =30°,∠COB =2∠CAB =60°,………………………………8分在Rt △AOE 中,AO =AB =2,12∴OE =OA =1,AE 12=∴AC =2AE =………………………………10分∴AOC BOCS S S ∆=+阴影扇形=2160212360π⨯⨯⨯+……………………………12分23π24.(本小题满分12分)解:(1)由题意可得, y =250-10x=﹣10x+250,y 与x 之间的函数解析式是y =﹣10x +250;……………………………2分(2)设当该商品每件的售价上涨x 元时,销售该商品每星期获得的利润为w 元.由题意可得:w=……………………………4分(5040)(10250)x x +--+=2101502500x x -++=210(7.5)3062.5x --+∵,0≤x ≤25且x 为整数100-<∴当x =7或8时,w 取得最大值3060,此时50+x =57或58.……………………6分答:当该商品每件的售价为57或58元时,每星期获得的利润最大,最大利润为3060元.……………………………7分(3)由题意得:……………………………8分21015025003000x x -++=解得……………………………10分12510x x ==,当x =5或10时,此时50+x =55或60又∵售价不超过58元∴5≤x ≤8且x 为整数…………………………12分25.(本小题满分13分)(1) ①DF 的长为 2 …………………………2分②解:∵四边形ABCD 是矩形∴∠BCD =∠A =∠ABC =∠D = 90°,CD =AB =6由对称可知∠BFE =∠BCD =90°, BF =BC∴∠AFB +∠DFE =90°,∠DEF +∠DFE =90°,∴∠AFB =∠DEF又:∠D =∠A =90°∴△FAB ∽△EDF . ………………………4分∴………………………5分AFBADE FD =∴AB ·DE =AF .DF =9.又∵AB =6,∴DE =……………………………………………6分32∴CE =CD -DE =6 -=………………………7分3292(2)分两种情况讨论.①当点F 在线段 AD 上时,如图(1),过点M 作 MN ⊥BF 于点N ,则∠MNF =∠A =90°.又∵∠AFB =∠NFM∴△FMN ∽△FBA∴MN MF FNAB BF AF==又∵,BF =BC12MF BC =∴12MNMFFNAB BF AF ===∴MN =3,AF =2FN …………………………………………8分∵BM 平分∠ABF ,∠BNM =∠A =90°,∴AM = MN =3.∴AM +MF =2FN∴13()22BN FN FN++=∴13(6)22FN FN++=∴FN =4…………………………………………9分∴AD =BF =BC =6+4=10∴AF =8∴DF =AD - AF =10-8=2…………………………………10分②当点F 在线段 DA 的延长线上时如图(2),过点M 作 MN ⊥BF 于点 P .同①可得AM =MN =AB =3,BN =AB =6,BC = AD =10,12MF =BC =5,12∴AF =8,∴DF =18.综上可知,DF 的长为2或18.…………………………………13分26.(本小题满分13分)26.(1)…………………………………3分4y x =+(2)解:由题意得:mx kx =+∴20x kx m +-=∵图象上只有一个“k 级差值点”∴方程 有两个相等的实数根20x kx m +-=∴△=0∴240k m +=∴…………………………………4分24m k =-∵424t m k =++∴…………………………………5分224t k k =-++=2(1)5k --+当k =1时,t 有最大值5,当t =-3时,t 有最小值-11-11≤t ≤5…………………………………7分(3)由题意得若 k =3时,直线 l 上有“k 级差值点”∴y =x +3∴n =1…………………………………8分∴x +3= a (x -h )²+h +3∴x 1=h ,x 2=…………………………………9分1h a+∵AB ≥利用两点间距离公式或根据够勾股定理得出≥3即≥3………………………………11分12x x -1a ∴或,即………………………………13分103a <≤103a >≥-11,033a a ≥≥-≠。
六年级第二次语文月考试卷
一、选择题(每题2分,共20分)1. 下列词语中,加点字的注音全部正确的一项是()A. 精湛(zhàn)岁月(suì)悠然(yōu)B. 沉默(mò)恬静(tián)惊悚(sǒng)C. 踟蹰(chí)精悍(hàn)灵巧(qiǎo)D. 憔悴(cuì)沉着(zhù)炽热(chì)2. 下列句子中,没有语病的一项是()A. 他不仅学习成绩优秀,还积极参加各种课外活动。
B. 假如明天不下雨,我们就去公园玩。
C. 我因为昨天晚上没睡好,所以今天上课打瞌睡。
D. 小明非常喜欢踢足球,他的技术也越来越好了。
3. 下列句子中,使用比喻修辞手法的一项是()A. 这座塔高耸入云,就像一根巨大的针。
B. 他的笑容温暖如阳光。
C. 他的歌声悦耳动听,像一股清泉流进心田。
D. 这本书的内容非常丰富,就像一个宝库。
4. 下列词语中,字形、字义完全相同的一项是()A. 拥护保卫保护B. 灵敏灵巧灵活C. 悲伤悲惨悲凉D. 美丽美观美满5. 下列句子中,运用了排比修辞手法的一项是()A. 雨中的荷花,娇艳欲滴,清香四溢。
B. 小明很聪明,学习成绩优秀,性格开朗。
C. 这本书的内容丰富,让人爱不释手。
D. 雨中的小路,泥泞不堪,湿滑难行。
二、填空题(每题2分,共10分)6. 《两小儿辩日》出自《__________》,讲述了孔子带领弟子们游历时的一个有趣故事。
7. 《桂林山水甲天下》一文中,作者用“__________、__________”来形容漓江的水。
8. 《最后一课》中,小弗朗士的爱国主义精神让我们深受感动,他为了记住法语,将法语字母默写__________遍。
9. 《少年闰土》中,闰土给“我”讲述了雪地捕鸟、海边拾贝、看瓜刺猹等有趣的故事。
10. 《凡卡》一文中,凡卡写给爷爷的信中提到:“__________,__________。
福建省福州市仓山区2024-2025学年二年级上学期第二次月考语文试题
2024-2025学年福建省福州市仓山区二年级(上)月考语文试卷1.拼一拼,写一写。
d ào ch ùt óng h àos ōng b ǎishu ǐ sh ānhu à sh íxi ě z ìji ǔ yu èchu ī f ēngf éi p àngài d ài2.下列词语中,读音正确的是哪一项?( )A .手掌.(z ǎng )B .白桦.(huà)C .飞翔.(yáng )D .酸.(s ān )甜 3.给下列“场”字选择正确的读音。
①ch áng②ch ǎng广场 场院一场雨场景4.选择合适的量词填到横线上,将日记补充完整。
①首 ②家 ③张 ④根 ⑤束 ⑥个9月27日 星期一 天气:今天是妈妈的生日,我们一 人一起吃晚饭。
爸爸送了妈妈一 鲜花,我送了一 贺卡。
爸爸准备了一 蛋糕,上面插着几 蜡烛。
我给妈妈唱了一 生日歌。
祝我最爱的妈妈生日快乐!5.下列不是同一类的词语是哪一项?( ) A .松柏B .木棉C .银杏D .军舰6.许多城市都有自己的市花。
福州的市花是( ) A .月季花B .牡丹花C .茉莉花D .迎春花7.下列不是夏季农事活动的哪一项?( ) A .打谷B .养蚕C .插秧D .采桑8.选出括号里合适的汉字。
周末,我和爸爸妈妈去了野生动物 (圆 园),那里有很多可爱的小动物。
花 (从 丛)里,勤劳的小蜜蜂在采花蜜;又高又(状壮)的(杨扬)树上,一只金色的小鸟在唱(歌哥);(圆园)滚滚的大(熊能)猫在吃竹子……9.连一连,填一填。
正月牡丹满盆开四月山茶国色香七月水仙斗冰霜冬月寒梅案头供腊月茉莉花如雪我知道:“正月”中的“正”读,指的是农历月;冬月是农历月;腊月是农历月。
10.我会填。
(1)我发现“孔雀”“大雁”“老鹰”都有部件;“锦鸡”“黄鹂”“天鹅”都有部件。
2022-2023学年天津市第一中学高三上学期第二次月考化学试卷带讲解
C.H2S分子间为范德华力,晶体堆积为最密堆积,每个H2S周围有12个紧邻的分子,而冰中水分子间有氢键,每个H2O周围只有4个紧邻的分子,C正确;
D.O3分子中O与O之间为非极性键,但由于正负电荷中心不重合,为极性分子,D错误;故选C。
【答案】B
【解析】
【详解】A.氯化铵由铵根离子和氯离子构成,为离子晶体,A正确;
B.铵根离子中N原子杂化方式为sp3杂化,键角为109。28',B错误;
C.NH4Cl晶体中铵根和氯离子之间为离子键,氮原子和氢原子之间为共价键,C正确;D.根据晶胞结构可知每个Cl-周围与它最近且等距离的铵根离子的数目为8,在周围八个立方体体心位置,D正确;
D.[Cu(NH3)4]SO4在乙醇中的溶解度小于在水中的溶解度,所以向溶液中加入乙醇后因为溶解度减小,析出蓝色晶体[Cu(NH3)4]SO4,故D错误;
故选B
第II卷(共64分)
二、简答题
13.请回答下列问题
(1)钴及其化合物有重要的用途,探究其结构有重要意义。
①按照核外电子排布,可把元素周期表划分为5个区,Co在元素周期表中属于_______区。
C.R元素位于元素周期表的p区
D.R元素基态原子的轨道表示式:
【答案】A
【解析】
【分析】短周期元素R的第一电离能和第二电离能较小,第三电离能远大于第二电离能,说明该原子最外层有2个电子,处于IIA族,该原子存在第五电离能,说明核外电子数数目
大于4,故R为Mg元素,位于第三周期第IIA族。
【详解】A.同周期元素的第一电离能:IIA族>IIIA族>IA族,故R元素同周期相邻元素的第一电离能均小于738kJ·mol-1,故A正确;
天津市第一中学2023-2024学年高三上学期第二次月考英语试卷
天津市第一中学2023-2024学年高三上学期第二次月考英语试卷学校:___________姓名:___________班级:___________考号:___________一、单项选择1.— Why didn’t you come to the party?— _______, but I’d really like some time alone to clear my thoughts.A.No wonder B.No offence C.No comment D.No doubt 2.Most schools nowadays prefer to use continuous ________, because it gives a fairer picture of how the student has done during the whole year.A.admission B.application C.allowance D.assessment 3.She drew a deep breath to calm herself down but her look still ________ her anger and disapproval.A.defined B.betrayed C.generated D.handled 4.—How did the residents in your community show their sympathy to the victims in the stricken area?—A large sum of money, with relief supplies, ________ to them.A.is offered B.are offered C.was offered D.were offered 5.How come? I can’t find my key. I just left it ________ it had been.A.where B.whichC.when D.how6.Michael and his family migrated to New Zealand in the hope of living a better life, only ________entirely new hardships.A.encounter B.encountering C.to encounter D.encountered 7.Elizabeth was enormously motivated although she made ________ advances in her English learning.A.brilliant B.modest C.substantial D.considerable 8.The computers made by our company sell well, but several years ago no one could imagine the role in the market that they ________.A.has played B.were to play C.had played D.played9.—I think changing jobs too frequently is not very good, because a rolling stone gathers no moss.—______ I’ll stay in the present job longer.A.Not exactly.B.That’s not the point.C.You got me there.D.You said it.10.—It turned out to be quite warm in Beijing. We ________ the trouble to take warm clothes.—Good watch prevents misfortune.A.needn’t have taken B.needn’t takeC.mustn’t have taken D.mustn’t take11.We all show admiration for the charity organizations ________ to building a better future for the young kids in poverty.A.committing B.to commit C.committed D.havingcommitted12.________ the whole family get together on the Moon Festival is deeply rooted in Chinese culture.A.What B.When C.How D.That13.A traffic accident took away her parents when she was in college, but she finally________ with her friends’ company and support.A.worked out B.pulled through C.got across D.went through 14.Students receiving poor grades, which ________ lead to negative self-recognition, are sure to be on the high-risk list of dropping out.A.in contrast B.in effect C.in brief D.in turn 15.Stress is everywhere and in fact it isn't such a bad thing ________ it is often supposed to be.A.that B.as C.what D.which二、完形填空Not long ago, I was the guide on a wildlife-photography trip to Svalbard near the Northcamera. The motion sensor reacted to the bear’s 22 , making the camera start taking pictures. The bear circled the 23 , gently sniffing it. Unexpectedly the camera 24 into the hole and disappeared beneath the deep ice.That was the 25 moment in my photography career. I was so 26 with myself. A year later I obtained 27 to bring a remotely operated vehicle (ROV) to find the camera. There was a lot more ice than the 28 trip. As I knew well, polar bears could be nearby. We decided to 29 it. The ice was so thin, and soon we 30 technical difficulties and had to pull the ROV out of the water twice. 31 on the third try the ROV found the camera. We shouted and 32 around on the ice.I was overjoyed to see all my 33 . I saw the polar bear breathing and sniffing the camera. 34 that camera is the most satisfying 35 of my career with the lovely animal and its habitat presented.16.A.research B.training C.inspection D.adventure 17.A.spotted B.avoided C.imagined D.appreciated 18.A.threw B.buried C.placed D.applied 19.A.character B.image C.acceptance D.description 20.A.pulling B.shouting C.drawing D.crying 21.A.terrible B.simple C.abnormal D.sharp 22.A.movement B.situation C.position D.smell 23.A.seal B.ice C.hole D.camera 24.A.dug B.leaked C.slipped D.raced 25.A.luckiest B.worst C.brightest D.wettest 26.A.annoyed B.embarrassed C.bored D.satisfied 27.A.commitment B.recognition C.excuse D.permission 28.A.ordinary B.previous C.precious D.tight 29.A.risk B.consider C.escape D.abandon 30.A.got over B.turned into C.ran into D.turned over 31.A.Obviously B.Amazingly C.Initially D.Gradually 32.A.stepped B.wandered C.floated D.danced 33.A.animals B.facilities C.photos D.friends 34.A.Recovering B.Acquiring C.Repairing D.Exploring 35.A.recommendation B.accomplishment C.discoveryD.evolution三、阅读理解Téa Obreht’s Favorite NovelsTéa Obreht’s new novel, Inland, tells the stories of an outlaw crossing the American West and a homesteader awaiting the return of her husband. Below, she recommends other novels shaped by place.The MeadowJames Galvin (1992).Galvin narrows his novel’s focus to a river in south-eastern Wyoming, the site of three generations’ struggle and achievements. “I often find myself reading each sentence twice, just to enjoy the unexpected twists of Galvin’s prose (散文). ”What Is Not Yours Is Not Y oursHelen Oyeyemi (2016).Everything about this story collection delights and puzzles the soul, in a way of experiencing the terrifying fairy tale for the first time. Each story feels like working around you in a kind of harmony you can’t even begin to comprehend until the final line.Orange WorldKaren Russell (2019).“Every new book of Russell’s instantly takes its previous book’s place as my favorite.” Place, in each of these time-jumping, world-warping stories — which unfold a map of place both real and imagined — provides physical, social, and emotional pressures on both character and reader.The Bluest EyeToni Morrison (1970).“Morrison’s novel remains my favorite, possibly owing to the particular feelings produced by its place and personhood, and its suggestion that how you experience the world is governed by age, race, and whether or not one grows up loved.”36.What do the four novels have in common?A.They have similar plots.B.They are shaped by place.C.They have the same background.D.They are written by Téa Obreht.37.Which of the statements is true about What Is Not Yours Is Not Yours?A.It fills the reader’s heart with terror.B.It’s a story collection without harmony in each story.C.It’s a prose authored by Helen Oyeyemi.D.The harmony in it can not be understood until the end.38.How does Téa Obreht evaluate Karen Russell and her Orange World ?A.It takes on a dynamic and mysterious atmosphere.B.The reader feels their pressures taken off when they read it.C.Téa always likes Karen’s new book better than her previous one.D.It presents social conflicts in different times and worlds.39.What do you know about The Bluest Eye from the last paragraph?A.Its place and personhood impress Téa Obreht a lot.B.It advocates ecological balance in nature.C.It suggests a connection between love and success.D.Age and gender impact how you experience the world.I’ve worked in the factories surrounding my hometown every summer since I graduated from high school. But making the transition between school and full-time blue-collar work during the break never gets any easier. For a student like me who considers any class beforenever seem to understand why I’m so relieved to be back at school or that my summer vacation has been anything but a vacation.There are few people as self-confident as a college student who has never been out in the real world. People of my age always seem to overestimate the value of their time and knowledge. In fact, all the classes did not prepare me for my battles with the machine I ran in the plant, which would jam whenever I absent-mindedly put in a part backward or upside down.The most stressful thing about blue-collar life is knowing your job could disappear overnight. Issues like downsizing and overseas relocation had always seemed distant to me until my co-workers told me that the unit I was working in would shut down within six months and move to Mexico, where people would work for 60 cents an hour.After working 12-hour shifts in a factory, the other options have become only too clear.When I’m back at the university, skipping classes and turning in lazy re-writes seems too irresponsible after seeing what I would be doing without school. All the advice and public-service announcements about the value of an education that used to sound stale now ring true.These lessons I’m learning, however precious, are always tinged (带有) with a sense of guilt. Many people pass their lives in the places I briefly work, spending 30 years where I spend only two months at a time. “This job pays well, but it’s hell on the body,” said one co-worker. “Study hard and keep reading,” she added.My experiences in the factories have inspired me to make the most of my college years before I enter the real world for good.40.How did the author look back on his summer days while at college?A.They brought him nothing but torture.B.They were no holiday for him at all.C.They were a relief from his hard work at school.D.They offered him a chance to know more people.41.Which of the following is closest to the underlined word “torture” in the first paragraph?A.Misery.B.Fortune.C.Anxiety.D.Availability. 42.What does the author say about college students?A.They expect too much from the real world.B.They have little interest in blue-collar life.C.They think too highly of themselves.D.They are confident about their future.43.What, according to the author, is most frustrating for blue-collar workers?A.They do not get decent pay.B.They do not have job security.C.They have to work 12-hour shifts.D.They have to move from place to place.44.Why does the author feel somewhat guilty?A.He realizes there is a great divide between his life and that of blue-collar workers.B.He looks down upon the mechanical work at the assembly line.C.He has not done much to help his co-workers at the factory.D.He has stayed at school just for the purpose of escaping from the real world.45.In what important way has the author’s work experience changed him?A.He learned to be more practical.B.He acquired a sense of urgency.C.He came to respect blue-collar workers.D.He came to appreciate his college education.Dreams, according to Carl Jung, reveal a certain amount of reality hidden during waking consciousness. In Jungian philosophy, the conflict and chaos experienced in dreams finally bring order to our lives. While Jung’s mystical theories are debatable, he was not mistaken about the importance of dreaming. A growing number of reports show that a continuous lack of dreaming is damaging our waking hours in many ways.This trend is causing damage to our immune and metabolic systems, let alone the electronic products that keep us up late at night are ruining our sleep patterns, which has long-term consequences on our memory system. One study showed that not allowing mice to have adequate amounts of REM (Rapid Eye Movement) sleep, the stage in which we dream, the mice couldn’t strengthen memories.You might think this is just a sleep problem, but dreaming is inseparable from our nighttime rest. We sleep in cycles, each lasting about 90 minutes; in a sleep cycle, we go through non-REM sleep before hitting REM. As the night progresses, REM sleep periods increase in length while deep sleep (one of the stages of non-REM sleep) decreases. The longer we sleep, the more time we spend in REM, which is why we are often dreaming when waking up in the morning. If we sleep less than seven hours, however, it becomes harder to achieve this level of REM.The combination of sleeping and dreaming acts as an emotional stabilizer. We recover from emotional hurt faster when we sleep and dream properly. However, we’re not getting enough sleep to cycle through the stages to take advantage of this natural circadian anti-depressant (抗抑郁剂) — dreams. Instead, we get depressed and turn to alcohol or medicines to get to sleep, which only makes things worse because even one drink leads to late REM while anti-depressants promote deep sleep at the expense of REM.We’re paying for this lack of dreaming in many ways. For example, a 2021 study stated that compared with quiet rest and non-REM sleep, REM promoted the formation of associative networks and the integration of unassociated information. V olunteers thatexperienced more REM sleep were better equipped for solving problems requiring innovative solutions.Rowan Hooper, the managing editor at New Scientist, writes that dreams that include an “emotional core” appear to be a main function of REM sleep and that we should look at sleep patterns as seriously as we do diet and exercise habits.46.What’s Carl Jung’s view about dreams?A.They cause chaos.B.They damage immunity.C.They reveal secrets.D.They mirror reality.47.Why is the sleep process explained in Paragraph 3?A.To show a dream mainly occurs during REM sleep.B.To prove the minimum sleep time should be seven hours.C.To prove dream problems and sleep problems are attached.D.To show people often dream when waking up in the morning.48.Which of the following statements is true according to the author?A.Deep sleep is one of the stages of REM sleep.B.Adequate REM sleep contributes to a better memory.C.A sound sleep without dreams brings about stable emotions.D.The longer we sleep, the less time we spend in REM.49.What conclusion can be inferred from Paragraph 5?A.Dreaming promotes creativity.B.Dreaming helps fight depression.C.The brain still receives new information during REM sleep.D.The brain is paying the price for having more non-REM sleep.50.What’s the main idea of the passage?A.The importance of sleep lies in dreams.B.The absence of dreams is terrible for us.C.Dreaming patterns are more important than we realize.D.Dreaming has mystical power of strengthening memories.Many years ago, I bumped into an old friend of mine. He had devoted his life to acting but had never been quite successful. In his middle age, he seemed defeated and sad.I thought of his dogged perseverance. Was it smart or foolish? What could he haveachieved? Had he quit his dream of acting and moved on? Our culture does not look kindly upon quitting. Failure is perfectly acceptable as long as it eventually results in success.We chant “Winners never quit” and “If at first you don’t succeed, try again.” We lap up stories of persistence, of the author who submitted stories for years before her novels were published or of the athlete who trained since childhood to win gold at the Olympics.Persistence pays off when it is rewarded with success, but it does not reward every person. For every JK Rowling, there are thousands of aspiring writers who will never get published. For every Olympic athlete, there are innumerable others who trained every day of their lives and never made the cut.We all agree that doing the same things and expecting a different result is unwise. So why do we believe that persevering through failure after failure is a good idea? We consider quitting in the face of failure to be weak. We believe that perseverance is the key to success. Perseverance is only one part of success. You need talent or skill, as well as passion and drive. Luck and timing are also key to any great success.Our society believes that anything is possible, as long as you “believe”. But not everyone can make it. Quitting when you’ re not ahead is sometimes the smartest thing to do. Obviously, if you enjoy a pursuit, regardless of its outcome, you should continue. If you knew your novel would never be published, would you want to write? If you could never be a champion swimmer, would you still train? Sometimes, it is wise to put your energy into something else.Failure is not always the path to success. Sometimes, failure is the door to something new.51.What do we know about the author’s old friend?A.He was dissatisfied with his acting performance.B.He switched his dream of acting to something else.C.He failed in acting because of a lack of persistence.D.He failed in all attempts to become a successful actor.52.The author mentioned JK Rowling mainly to ______.A.explain how she achieved success in writingB.show that success doesn’t happen to everyoneC.prove that success favors those who are perseverantD.encourage readers to pursue their dream until they succeed53.What is the meaning of the underlined phrase in paragraph 4?A.Held on to their dreams.B.Met the required standard.C.Improved their performances.D.Promised to be good players.54.What does the author advise us to do if we’ve failed many times?A.Make an effort to try new things.B.Stick to your goal until we succeed.C.Wait for the right time and good luck.D.Ask friends or family members for help.55.Which of the following do you think is the best title for the passage?A.Stick to your dream--anything is possibleB.Perseverance: the secret to successC.Flexibility vs. PerseveranceD.Perseverance-the only access to success?四、阅读表达阅读表达Why are so many people unhappy in their jobs? There are two primary reasons. First, some people are convinced that earning a living is wasting time that they could spend enjoying themselves or uncovering their true talents.If this is the case with you, recall your last long vacation. Was it two weeks of complete enjoyment? More likely it was a week and a half of fun in the sun, with another half a week of “Boy, I can’t wait to get back to work.” If you didn’t feel such vacation blues, then imagine taking a leave of absence. You could use it to work on a novel, attend classes or just sit around watching TV. At the end of three months, in all likelihood, your self-respect would be at an all-time low. While all work and no play are not good, all play and no work are disastrous. We need to feel we are accomplishing something. We also need some form of order in our lives.The second and perhaps more common reason for people not to like their work is that they feel trapped. Once you’ve been at a company for five years and get married, have amortgage and a child, you often feel you have very little choice about jumping ship if things aren’t turning out as you’d planned. A steady paycheck can be the biggest restrict of all. People hate having to do something because they have no other choice.If you find yourself hating your job, your option takes the form of an up-to-date resume. You might also take a weekly glance through the help-wanted section, and make some visits to industry functions where low-key networking can take place. You’re not giving up on your current job. Rather, you are providing yourself with an option. If things get unbearable at work, you could jump ship.At the core of adopting a positive attitude to your workplace is, above all, assuming responsibility for your own situation. Most people feel controlled by their environment, but they really aren’t. They have to learn to manage that environment so they can get from it what they need.56.What are people likely to do after a long vacation according to the author? (No more than 10 words)57.What can people get from work according to the second paragraph? (No more than 10 words)58.How do you interpret the underlined word in the last paragraph? (One word)59.What do you think is the main idea of the passage? (No more than 15 words)60.What will you do if you hate your job one day in the future? (No more than 20 words)五、其他应用文61.假设你是李津,10月26日中午12:30你校在校园举办了“凉山义卖”活动,为四川凉山的贫困孩子们筹款。
2023-2024学年第一学期联盟校第二次月考初一数学试卷
2023-2024学年第一学期联盟校第二次月考初一数学试卷(满分:100分时间:90分钟)一.选择题(共10题,每小题3分,共30分,在每小题给出的四个选项中,只有一项是符合要求的。
)1.﹣2023的绝对值是()A.﹣2023B.C.D.20232.2023年9月23日亚运会在杭州正式开幕。
据杭州文旅大数据统计,亚运会期间,外地游客量超过20000000人次,请将20000000用科学记数法表示为()A.2×106B.0.2×108C.2×107D.2×1083.如果x=y,那么根据等式的性质下列变形正确的是()A.x+y=0B.=C.x﹣2=y﹣2D.x+7=y﹣74.下列各图中,表示“射线CD”的是()A.B.C.D.5.下列计算正确的是()A.3ab+2ab=5ab B.5y2﹣2y2=3C.7a+a=7a2D.m2n﹣2mn2=﹣mn2 6.某网店进行促销,将原价a元的商品以(0.9a﹣20)元出售,该网店对该商品促销的方法是()A.原价降价20元后再打9折B.原价打9折后再降价20元C.原价降价20元后再打1折D.原价打1折后再降价20元7.若∠A=32°18′,∠B=32°15′30″,∠C=32.25°,则()A.∠C>∠A>∠B B.∠B>∠A>∠C C.∠A>∠C>∠B D.∠A>∠B>∠C 8.某校教师举行茶话会。
若每桌坐10人,则空出一张桌子;若每桌坐8人,还有4人不能就座。
设该校准备的桌子数为x,则可列方程为()A.10(x﹣1)=8x﹣4B.10(x+1)=8x﹣4C.10(x﹣1)=8x+4D.10(x+1)=8x+49.一个小立方体的六个面上分别标有A、B、C、D、E、F,从三个不同方向看到的情形如图所示,则字母B的对面是字母()A.点D B.点E C.点F D.点A10.如图,在一个长方形(长为5cm ,宽未知)木框中,一些大小不一的长方形纸片不重叠地放在里面,在长方形木框里面左侧是2个相同的大长方形纸片,右侧是4个相同的小长方形纸片,右侧的小长方形纸片长为n cm ,宽为m cm ,则此长方形木框的周长是()A .(6m ﹣2n +10)cmB .(6m +2n +10)cmC .2(3m +n )cmD .2(3m ﹣n )cm二.填空题(本题共6小题,每小题3分,共18分)11.单项式﹣5mn 3的系数为.12.从一个九边形的一个顶点出发有条对角线。
山东实验中学2024年高三下学期第二次月考试题英语试题试卷含解析
山东实验中学2024年高三下学期第二次月考试题英语试题试卷请考生注意:1.请用2B铅笔将选择题答案涂填在答题纸相应位置上,请用0.5毫米及以上黑色字迹的钢笔或签字笔将主观题的答案写在答题纸相应的答题区内。
写在试题卷、草稿纸上均无效。
2.答题前,认真阅读答题纸上的《注意事项》,按规定答题。
第一部分(共20小题,每小题1.5分,满分30分)1.---I’m sure Andrew will win the first prize in the final.---I think so. He _____ for it months.A.is preparing B.has been preparing C.was preparing D.had been preparing2.The farmer used wood to build a house ________ to store grain.A. thatB. in whichC. whichD. what3.If you ___________ to my advice carefully, you would n’t have made such a terrible mistake.A.listened B.have listenedC.would listen D.had listened4.The foreigners here are greatly impressed by the fact that _______ people from all walks of life are working hard for ________ new Tianjin.A./; a B./; theC.a; a D.the; the5.The people succeeded because they understood that you can’t let your failures _________ you ——you have to let your failures teach you.A.define B.declineC.qualify D.simplify6.They have leading experts in this field, and that's ____ they've made important progress.A.where B.why C.whether D.who7.My daughter, _________ all kinds of meat, would not like to eat any vegetable, which worries me a lot. A.devoted to B.addicted to C.accustomed to D.exposed to8.-Do you really mean it when you say he will a good president?A.judge B.duit C.turn D.Serve9.________about the man wearing sunglasses during night that he was determined to follow him.A.So curious the detective wasB.So curious was the detectiveC.How curious was the detectiveD.How curious the detective was10.Jane is not good at sports,but when it to cooking,she’s excellent.A.happens B.comes C.does D.occurs11._____ the plant once a week if you are to get fruit in the autumn.A.Watered B.Watering C.To water D.Water12.Many netizens are impressed with the excuse given by a teacher for quitting her job ______ she owes the world a visit.A.because B.that C.where D.why13.—I’m burnt out as I’ve been working on my essay all the time.—____________. You’ll surely make it.A.Don’t put on airs B.Give me a breakC.Don’t get on my nerve D.Hang in there14.---We want someone to design the new art museum for me.---_____ the young fellow have a try?A.Shall B.May C.Will D.Need15.—Jenny,how did your math exam go?—I thought I ________,but in fact I came in the top 10% in the class.A.might have failed B.couldn’t have failed C.should have failed D.mustn’t have failed16.—I'm going to order chicken and salad.What about you?—.I'll have the same.A.I'm afraid not B.It's up to youC.That sounds good to me.D.That depends17.Had Mary not been hurt in the car accident, ________ the next week’s marathon.A.she would run B.she would have runC.she will run D.she must have run18.As to the long-term effects of global warming some believe that the damage has been done,______________________.A.otherwise we take steps to make up nowB.now that we take steps to make upC.whether we take steps to make up now or notD.unless we take steps to make up now19.English is a language shared by several diverse cultures, _________ uses it differently.A.all of which B.each of which C.all of them D.each of them20.During the period of recent terrorist activities, people _____ not to touch an unattended bag.A.had always been warned B.were always being warnedC.are always warning D.always warned第二部分阅读理解(满分40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。
广东省东莞市长安镇2024-2025学年六年级上学期第二次测试语文试卷
2024-2025学年广东省东莞市长安镇六年级(上)第二次月考语文试卷1.聆听巾帼英雄赵一曼的故事,完成练习。
(一)根据所听到的内容完成填空。
ㅤㅤ1935年冬天,赵一曼在战斗中负伤,她的 中弹,但她依然坚持战斗,最终因 重伤而被敌人捕获。
(二)判断下列说法是否正确,正确的打“√”,错误的打“×”。
(1)赵一曼在战斗中只身一人留下来阻击敌人。
(2)面对日军的严刑逼供,赵一曼始终没有向敌人泄露任何情报。
(3)赵一曼的英勇事迹激励了无数中国人。
2.看拼音规范写词语。
ㅤㅤ团长率领着战士们①p ān d ēng 那座险峻的②xuán yá。
战士们③yì lì在顶峰,目光坚定,心中充满了对胜利的渴望。
他们如同山巅的青松,无论风霜雨雪,依旧坚韧不拔,展现出了不屈的意志和勇往直前的精神,④háo mài 的英雄气概在他们身上熠熠生辉。
3.下列四组词语中字形或加点字注音有误的一项是( )A .斩钉截铁 居高临下 气势磅礴 逶.迤(w ēi )B .粉身碎骨 惊天动地 千均一发 笨拙.(zhuó)C .灯光璀璨 聚精会神 排山倒海 沸腾.(téng )D .波浪滚滚 迎风招展 声势浩大 岷.山(mín )4.下列句子中,加点成语使用正确的一项是( )A .运动会前,同学们一个个摩拳擦掌,蠢蠢欲动....,决心为班级争光。
B .登上开满杂花的小山坡,俯瞰山下的沧海桑田....,真是心旷神怡!C .老师又教了我们一种思路,重蹈覆辙....地将这道题做了一遍。
D .做学问是一项艰苦的劳动,应踏踏实实,不能好高骛远....。
5.下面描写场面的句子中,运用了点面结合的方法的一项是( )A .观众们也被带动起来了,和着节拍拍手,闭上眼睛随着节拍晃头。
B .乐曲结束了,男乐手在灯光的投射下重返座位。
人群中爆发出如潮的掌声,还有人大喊:“再来一个!”C .原本寂静的操场一下子沸腾起来,人山人海,热闹非凡,仿佛变成了一个自由市场。
(成都七中)四川省成都市第七中学2023-2024学年高二上学期第二次月考模拟试卷一(解析版)
2023外研版-高二上册-成都第七中学
(第二次月考模拟试卷)
(本试卷不含听力)
考试时间:120分钟总分:150分
养成良好的答题习惯,是决定成败的决定性因素之一。做题前,要认真阅读题目要求、题干和选项,并对答案内容作出合理预测;答题时,切忌跟着感觉走,最好按照题目序号来做,不会的或存在疑问的,要做好标记,要善于发现,找到题目的题眼所在,规范答题,书写工整;答题完毕时,要认真检查,查漏补缺,纠正错误。
【3题详解】
细节理解题。根据最后一段“It is a social networking application for dogs. Users can share with other people what’s going on in their dog’s life, share photos, and find great animal-friendly places to meet up.”(这是一款狗狗社交网络应用。用户可以与其他人分享他们的狗狗生活中发生的事情,分享照片,并找到适合动物的地方见面。)可知,用户可以在Dogbook上交流养狗经验。故选D项。
B篇
Multitasking (多任务处理) refers to performing different activities at the same time,such as editing a document or replying to emails while participating in a teleconference. People think that they are capable of doing many things at once. However, the fact remains that they are merely switching from one job to the other.
福建省泉州市2024-2025学年四年级上学期第二次月考语文试卷
2024-2025学年福建省泉州市四年级(上)第二次月考语文试卷1.下列哪个词语中带点字读音正确?()A.蝙.蝠(biǎn)B.潜.水(qiǎn)C.传播.(pō)D.出乎意料.(liào)2.下列哪组词语中加点多音字的读音不相同?()A.将.相——将.领B.关系.——联系.C.屏.风——荧光屏.D.麻雀.——家雀.儿3.下列词语中书写有误的是哪一项?()A.洋溢B.蚊蝇C.超跃D.曾经4.根据汉字的构字规律,“氚(chuān)”字的意思与下列哪个选项有关?()A.山川B.河流C.天气D.气体5.下列哪个句子中,加点词意思哪一项不同于其他三项?()A.大家只要认真学习,自然..会取得好成绩。
B.自然..是一幅美丽的画卷,让人心旷神怡。
C.有些问题孩子在长大后自然..会明白。
D.老太太听了,宽了心,病自然..就好了。
6.下面句子中横线处,填入哪个关联词语更合适?()这里山林茂密,_____下暴雨,小溪_____清澈见底。
A.即使……也B.如果……就C.无论……都D.因为……所以7.下列哪一句的表达方式与其他三句不同?()A.那条狗高兴的时候叫,紧张的时候叫,发怒的时候也叫。
B.小鹿侧着头看着湖中自己的倒影,沉浸在自己美丽的身姿中。
C.天上的云,真是千姿百态,有的像羽毛,有的像鱼鳞,还有的像山峦。
D.妈妈特别喜欢唱歌,做饭的时候唱,洗衣服的时候唱,拖地的时候也唱。
8.下列哪一项的问题需要回答?()A.是谁来呼风唤雨呢?当然是人类。
B.春天在哪里?春天在人们的眼睛里。
C.“是谁将雪花撒下?”小妹妹好奇地问。
D.海底是谁在发出声音呢?是各种鱼类。
9.“‘蝙蝠探路’还可以用在生活中的什么地方?”这是一位同学读了《夜间飞行的秘密》后提出的问题,这是从以下哪个角度进行提问?()A.联系生活经验B.针对课文部分内容C.针对课文的写法D.针对课文整体提问10.下面这句话插入语段中的哪个位置最为恰当?()ㅤㅤ这是什么呀?我满心疑惑,仔细一看,竟是稿费单。
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岳阳县职业中专林果花卉生产技术第二阶段试题卷
总分150分考试时间90分钟
一、选择(每小题3分,共60分。
每小题中只有一个选项是正确的)
1、下列果树中的草本果树为()
A、枇杷
B、梨
C、香蕉
D、葡萄
2、硬枝扦插苗插条的剪留长度一般为()cm左右
A、20
B、50
C、100
D、80
3、梨树中果枝长度为()
A、5cm
B、5-15cm
C、15-30cm
D、30-60cm
4、用福尔马林给种子消毒时浓度为()
A、10%
B、5%
C、0.15%
D、0.5%
5、下列果树中为仁果类的是()
A、梨
B、桃
C、葡萄
D、杏
6、属于短日照花卉的为()
A、万寿菊
B、羽衣甘蓝
C、雏菊
D、红叶甜菜
7、下列属于阳性花卉的为()
A、兰科花卉
B、仙人掌科花卉
C、蕨类花卉
D、天南星科花卉
8、下列花卉属于芳香类的为()
A、苏铁
B、金柑
C、茉莉
D、龟背竹
9、下列最不耐寒的果树为()
A、梨树
B、桃树
C、葡萄
D、龙眼
10、下列实生苗结果期最迟的为()
A、枇杷
B、梨树
C、桃树
D、银杏
11、下列对建立枇杷园描述错误的一项为()
A、石灰土和沙土最宜建园。
B、土层深厚、疏松肥沃、富含有机质、排水好、PH植6左右的砂质壤土最好。
C、风沙荒地、岗坡地均可建园。
D、丘陵地南坡地最宜建园。
12、荔枝、龙眼均属于()
A、蔷薇科
B、芭蕉科
C、凤梨科
D、无患子科
13、枇杷果园防寒防冻措施错误的为()
A、花期束叶
B、摇雪
C、冬季增施化肥
D、凉根
14、下列栽培技术措施不属于调节开花期的是()
A、调节光照时间
B、调节温度
C、控制水肥
D、防治病虫害
15、枇杷树一般栽植()年后开枇杷树始结果。
A:2----3 B:3----6 C:6---8 D:8-----10
16、草本花卉最常用的繁殖方法为()。
A、组织培养
B、播种
C、嫁接
D、压条
17、不适宜与果树间作的作物有()
A、大豆
B、西瓜
C、茄子
D、玉米
18、果树的需水临界期为()
A、开花前期
B、新梢生长和幼果膨大期
C、果实迅速膨大期
D、果实采收前后和休眠期
19、桃树应用()
A、自然开心形
B、疏散分层形
C、变则主干形
D、丛状形
20、下列花卉繁殖方法中()不属于营养繁殖。
A、嫁接育苗
B、扦插育苗
C、播种育苗
D、分株育苗
二、判断((每小题2分,共20分。
在答题卡的括号内正确的打“√”,错误的打“×”)
21、乙烯利浓度超过0.3%会降低香蕉的风味和品质。
()
22、果树就是是多年生木本植物。
()
23、果树一般在授粉受精后子房膨大发育成果实。
()
24、结果量多时易消耗大量营养而影响果树的生长发育,栽培中一般应及时疏花疏果。
()
25、花卉生产中,常用的繁殖方法有营养繁殖和播种繁殖。
()
26、生和上常用的促进后插条生根的药剂主要有萘乙酸、吲哚乙酸、ABT生根粉等。
()
27、对一串红幼苗进行摘心可以延长开花时间。
()
28、如果土层十分薄,应进行客土栽培。
()
29、右击营养丰富、且肥效长,是一种长效型的肥料。
()
30、果树基肥以秋施为宜,这时正值根系第二次生长高峰,伤根容易愈合,可促发新根,肥料有充分的时间分解,部分肥料吸收后能增加树体内养分积累,提高树体的越冬能力和抗寒力。
()
三、名词(每小题3分,共12分)
31、逆温现象:
32、单造香蕉:
33、梨树芽的晚熟性:
34、花卉促成栽培:
四、简答(每小题10分,共40分)
35、简述提高花卉扦插成活率的技术措施。
36、简述香蕉催熟的方法。
37、怎样对葡萄合理施肥?
38、简述保花保果的措施。
五、论述(18分)
39、论述花卉种子层积沙藏法
三、名词(每小题3分,共12分)
31、逆温现象:
32、单造香蕉:
33、梨树芽的晚熟性:
34、花卉促成栽培:
四、简答(每小题10分,共40分)
35、简述提高花卉扦插成活率的技术措施。
36、简述香蕉催熟的方法。
37、怎样对葡萄合理施肥?
38、简述保花保果的措施。
五、论述(18分)
39、论述花卉种子层积沙藏法。