专题:一轮复习专项突破
2023年九年级数学中考一轮复习考点专项突破 第二章 代数式 2

第二章 代数式2.1 整式考点突破考点一 列代数式典例1 10名学生的平均成绩是x ,如果另外5名学生每人得84分,那么整个组的平均成绩是__________分. A.284+x B.1542010+x C.158410+x D.1542010+ 思路导引整个组的平均成绩=15名学生的总成绩÷15.点拨列代数式,需根据题意,找出题目蕴含的数量关系及正确书写代数式是解决问题的关键. 跟踪训练 11.用代数式表示:a 的2倍与3的和,下列表示正确的是( )A.2a-3B.2a +3C.2(a-3)D.2(a +3)2.某商店举办促销活动,促销的方法是将原价x 元的衣服以(54x-10)元出售,则下列说法中,能正确表达该商店促销方法的是( )A.原价减去10元后再打8折B.原价打8折后再减去10元C.原价减去10元后再打2折D.原价打2折后再减去10元3.用一根长为a (单位:cm )的铁丝,首尾相接围成一个正方形,要将它按图的方式向外等距扩1(单位:cm )得到新的正方形,则这根铁丝需增加( )A.4 cmB. 8 cmC.(a +4)cmD.(a +8)cm考点二 求代数式的值典例2 已知x 2+2x =-1,则代数式5+x (x +2)的值为___________.思路导引先根据整式的乘法去括号化简代数式,再将已知式子的值代入求值即可.点拨本题考查了代数式的化简求值,利用整式的乘法对代数式进行化简是解题关键. 跟踪训练 21.已知a +b =4,则代数式1+2a +2b 的值为( )A.3B.1C.0D.-12.观察如图所示的程序计算,若输出的结果为3,则输入的值m 为__________.A.1B.2C.-1D.-23.已知x +2y =3,则1+2x +4y =____________.考点三 同类项合并同类项典例3 若x a +1y 3与21x 4y 3是同类项,则a 的值是_____________. 思路导引所含字母相同,并且相同字母的指数也相同,这样的项叫做同类项,据此可得a 的值. 跟踪训练 31.如果3ab 2m-1与9ab m +1是同类项,那么m 等于( )A.2B.1C.-1D.02.若8x m y 与6x 3y n 的和是单项式,则(m +n )3的平方根为( )A.4B.8C.±4D.±83.若单项式2x m-1y 2与单项式31x 2y n +1是同类项,则m +n =___________. 考点四 规律的探索典例4 如图所示各图形是由大小相同的黑点组成,图1中有2个点,图2中有7个点,图3中有14个点,…,按此规律,第10个图中黑点的个数是:____________.思路导引根据题意,找出图形的规律,得到第n 个图形的黑点数为n(n+1)+(n-1)=(n+1)2-2,即可求出答案.跟踪训练 41.如图所示,正方形ABCD 的边长为1,以对角线AC 为边作第二个正方形ACEF ,再以对角线AE 为边作第三个正方形AEGH ,依次下去,第n 个正方形的面积为( )A.(2)n-1B.2n-1C.(2)nD.2n2.按一定规律排列的一列数:3,32,3-1,33,3-4,37,3-11,318,…,若a,b,c表示这列数中的连续三个数,猜想a,b,c满足的关系式是____________.考点五整式的加减运算典例5计算2a-3a,结果正确的是()A.-1B.1C.-aD.a思路导引根据合并同类项法则合并即可.点拨整式的加减计算,能熟练掌握去括号及合并同类项法则的内容是解题的关键.跟踪训练 51.下列运算正确的是()A. 2a+3b=5abB. a3·a2=a5C.(a+b)2=a2+b2D.(a2b)3=a6b2.计算x+7x-5x的结果等于___________.3.合并同类项:4a2+6a2-a2=_____________.考点六整式的乘、除、乘方运算典例6若3m=9n=2.则3m+2n=_____________.思路导引首先根据幂的乘方的运算方法,求出32n的值;然后根据同底数幂乘法的运算方法,求出3m+2n的值为多少即可.点拨此题考查幂的乘方与积的乘方,关键是根据幂的乘方与积的乘方解答.跟踪训练 61.计算a·a2结果正确的是()A.aB.a2C.a3D.a42.下列运算正确的是( )A.3x 3·x 2=3x 5B.(2x 2)3=6x 6C.(x +y )2=x 2+y 2D.x 2+x 3=x 53.若关于x 的二次三项式x2+ax +41是完全平方式,则a 的值是__________. 考点七 整式的混合运算及化简求值典例7 先化简,再求值:(a-1)2+a (a +2),其中a =2.思路导引先利用完全平方公式、单项式乘多项式法则展开,再去括号、合并同类项即可化简原式,继而将x 的值代入计算可得答案.点拨整式的混合运算化简求值,解题的关键是掌握平方差公式、完全平方公式、单项式乘多项式法则、去括号法则、合并同类项法则.跟踪训练 71.化简:(x-1)2-x (x +7).2.化简:(a +2)(a-2)-a (a +1).3.化简求值:(2x +3)(2x-3)-(x +2)2+4(x +3),其中x =2.中考真题1.(2020·聊城)下列计算正确的是( )A.a 2·a 3=a 6B.a 6÷a -2=a -3C.(-2ab 2)3=-8a 3b 6D.(2a +b )2=4a 2+b 22.下列计算正确的是( )A. 2x +3y =5xyB.(x +1)(x-2)=x 2-x-2C.a 2·a 3=a 6D.(a-2)2=a 2-43.计算(-2a 3)2÷a 2的结果是( )A.-2a 3B.-2a 4C.4a 3D.4a 44.(2020·攀枝花)下列式子中正确的是( )A.a 2-a 3=a 5B.(-a )-1=aC.(-3a )2=3a 2D.a 3+2a 3=3a 35.(2020·遂宁)下列计算正确的是( )A.7ab-5a =2bB.(a +a 1)2=a 2+21aC.(-3a 2b )2=6a 4b 2D.3a 2b ÷b =3a 2 6.(2020·达州)如图所示,正方体的每条棱上放置相同数目的小球,设每条棱上的小球数为m ,下列代数式表示正方体上小球总数,则表达错误的是( )A.12(m-1)B.4m +8(m-2)C.12(m-2)+8D.12m-167.(2020·枣庄)图1是一个长为2a ,宽为2b (a >b )的长方形,用剪刀沿图中虚线(对称轴)剪开,把它分成四块形状和大小都一样的小长方形,然后按图2那样拼成一个正方形,则中间空余的部分的面积是( )A.abB.(a+b)2C.(a-b)2D.a 2-b 28.(2020·乐山)已知3m =4,32m-4n =2.若9n =x ,则x 的值为( ) A.8 B.4 C.22 D.29.(2020·青海)下面是某同学在一次测试中的计算:①3m 2n-5mn 2=-2mn ;②2a 3b ·(-2a 2b )=-4a 6b ;③(a 3)2=a5;④(-a 3)÷(-a )=a 2.其中运算正确的个数为( )A.4个B.3个C.2个D.1个10.(2020·潍坊)若m 2+2m =1,则4m 2+8m-3的值是( )A.4B.3C.2D.1 11.(2020·盐城)把1-9这9个数填入3×3的方格中,使其任意一行,任意一列及两条对角线上的数之和都相等,这样便构成了一个“九宫格”.它源于我国古代的“洛书”(图1),是世界上最早的“幻方”.图2是仅可以看到部分数值的“九宫格”,则其中x的值为()A.1B.3C.4D.612.(2020·牡丹江)一列数1,5,11,19,…,按此规律排列,第7个数是()A.37B.41C.55D.7113.(2020·重庆B)下列图形都是由同样大小的实心圆点按一定规律组成的,其中第①个图形一共有5个实心圆点,第②个图形一共有8个实心圆点,第③个图形一共有11个实心圆点,…,按此规律排列下去,第⑥个图形中实心圆点的个数为()A.18B.19C.20D.2114.(2020·安顺)化简x(x-1)+x的结果是_____________.15.(2020·黔西南)若7a x b2与-a3b y的和为单项式,则y x=___________.16.(2020·临沂)若a+b=1,则a2-b2+2b-2=____________.17.(2020·宜昌)数学讲究记忆方法,如计算(a5)2时若忘记了法则,可以借助(a5)2=a5×a5=a5+5=a10,得到正确答案.你计算(a2)5-a3×a7的结果是____________.18.(2020·北京)如图所示是某剧场第一排座位分布图.甲、乙、丙、丁四人购票,所购票数分别为2,3,4,5.每人选座购票时,只购买第一排的座位相邻的票,同时使自己所选的座位号之和最小,如果按“甲、乙、丙、丁”的先后顺序购票,那么甲购买1,2号座位的票,乙购买3,5,7号座位的票,丙选座购票后,丁无法购买到第一排座位的票.若丙第一个购票,要使其他三人都能购买到第一排座位的票,写出一种满足条件的购票的先后顺序_______________.19.(2020·黔西南)如图所示,是一个运算程序的示意图,若开始输入x 的值为625,则第2020次输出的结果为_____________.20.(2020·宁波)计算:(a +1)2+a (2-a ).21.(2020·攀枝花)已知x =3,将下面代数式先化简,再求值:(x-1)2+(x +2)(x-2)+(x-3)(x-1).22.(2020·济宁)先化简,再求值:(x +1)(x-1)+x (2-x ),其中x =21.23.(2020·常州)先化简,再求值:(x +1)2-x (x +1),其中x =2.24.(2020·广东)先化简,再求值:(x +y )2+(x +y )(x-y )-2x 2,其中x =2,y =3.25.(2020·荆门)先化简,再求值:(2x+y)2+(x+2y)2-x(x+y)-2(x+2y)(2x+y),其中x=2+1,y=2-1.26.(2020·北京)已知5x2-x-1=0,求代数式(3x+2)·(3x-2)+x(x-2)的值.27.(2020·河北)有一电脑程序:每按一次按键,屏幕的A区就会自动加上a2,同时B 区就会自动减去3a,且均显示化简后的结果.已知A,B两区初始显示的分别是25和-16,如图所示.如,第一次按键后,A,B两区分别显示:(1)从初始状态按2次后,分别求A,B两区显示的结果;(2)从初始状态按4次后,计算A,B两区代数式的和,请判断这个和能为负数吗?说明理由.参考答案考点突破典例1 B跟踪练习1 1.B 2.B 3.B典例2 4跟踪练习2 1.A 2.C 3.7典例3 3跟踪练习3 1.A 2.D 3.4典例4 119跟踪练习4 1.B 2.bc=a典例5 C跟踪练习5 1.B 2.3x 3.9a 2典例6 4跟踪练习6 1.C 2.A 3.±1典例7 解:原式=a 2-2a +1+a 2+2a =2a 2+1,当a =2时,原式=5.跟踪训练71.解:原式=x 2-2x +1-x 2-7x =-9x +1.2.解:原式=a 2-4-a 2-a =-4-a3.解:原式=4x 2-9-(x 2+4x +4)+4x +12=4x 2-9-x 2-4x-4+4x +12=3x 2-1, 当x =2时,原式=3×(2)2-1=3×2-1=6-1=5.中考真题1.C2.B3.D4.D5.D6.A7.C8.C9.D10.D 11.A 12.C 13.C 14.x 2 15.8 16.-117.0 18.丙,丁,甲,乙 19.120.解:原式=a 2+2a +1+2a-a 2=4a +1.21.解:原式=x 2+1-2x +x 2-4+x 2-x-3x +3=3x 2-6x ,将x =3代入,原式=27-18=9.22.解:原式=x 2-1+2x-x 2=2x-1,当x =21时,原式=2×21-1=0. 23.解:原式=x 2+2x +1-x 2-x =x +1,当x =2时,原式=2+1=3.24.解:原式=x 2+2xy +y 2+x 2-y 2-2x 2=2xy ,当x =2,y =3时,原式=2×2×3=26.25.解:原式=[(2x +y)-(x +2y)]2-x 2- xy =(x-y )2-x 2-xy =x 2-2xy +y 2-x 2-xy =y 2-3xy.当x=2+1,y=2-1时,原式=(2-1)2-3(2+1)(2-1)=3-22-3=-22.26.解:原式=9x2-4+x2-2x=10x2-2x-4,∵5x2-x-1=0,∴5x2-x=1.∴原式=2(5x2-x)-4=-2.27.解:(1)A区显示的结果为:25+2a2,B区显示的结果为:-16-6a;(2)这个和不能为负数,理由:根据题意得,25+4a2+(-16-12a)=25+4a2-16-12a=4a2-12a+9=(2a-3)2,∵(2a-3)2≥0,∴这个和不能为负数.。
专项8自由组合定律中特殊分离比问题分析-2023年高考生物一轮复习疑难专项突破

[解析] F1有茸毛红果自交后代F2中出现了无茸毛、黄果,则有茸毛、红果为显性, A正确。F2中红果与黄果的比例是9∶7,是9∶3∶3∶1的变形,因此可以确定果实 颜色由两对相对独立的基因控制,有茸毛∶无茸毛=2∶1,说明有无茸毛由一对基
因控制,其中显性纯合致死;又因为控制两对相对性状的基因独立遗传,所以控
的等位基因控制。红花(A)对白花(a)为显性,B基因为修饰基因,能淡化花的
颜色,花色与基因组成的关系如表。两株纯合的白花植株杂交,得到的F1均开粉花,
F1自交得F2,下列相关叙述错误的是( C )
花色
红色
粉色
白色
基aa_ _、_ _BB
A. 该植物白花植株的基因型共有5种,其中杂合子只有2种
“合并同类项法”巧解自由组合定律特殊分离比 第一步,判断是否遵循基因自由组合定律:若双杂合子自交后代的表现型比例之 和为16(存在致死现象除外),不管以什么样的比例呈现,都符合基因自由组合 定律,否则不符合基因自由组合定律。 第二步,写出遗传图解:根据基因自由组合定律,写出遗传图解,并注明自交后 代性状分离比(9∶3∶3∶1)。 第三步,合并同类项,确定出现异常分离比的原因:将异常分离比与正常分离比 9∶3∶3∶1进行对比,根据题意,将具有相同表现型的个体进行“合并同类项”,如 9∶6∶1即9∶(3+3)∶1,确定出现异常分离比的原因,即单显性类型表现相同 性状。 第四步,确定基因型与表现型及比例:根据第三步推断出的异常分离比出现的原 因,推测亲本的基因型或推断子代相应表现型的比例。
[解析] 相对性状是指一种生物的同一性状的不同表现类型,因此棉花腺体有色素 和无色素是一对相对性状,A正确;由题意可知,相关显性基因的数量少于两个的 棉花腺体不产生色素,因此无色素棉花基因型是Aabb、aaBb、aabb,有色素棉花 的基因型是A_B_、AAbb、aaBB,有6种基因型,B正确;有A基因的无色素棉花和 含有B基因的无色素棉花杂交,可产生同时含有A、B基因的有色素棉花,C错误; AaBb的棉花自交,后代腺体有色素的比例是A_B_+AAbb+aaBB=9/16+1/16+1/16= 11/16,无色素的比例是Aabb+aaBb+aabb=2/16+2/16+1/16=5/16,即腺体有色素∶腺 体无色素=11∶5,D正确。
高考生物一轮复习 育种归纳类考能专项突破

藏躲市安详阳光实验学校考能专项突破(七)重点题型——⑦育种归纳类[题型特点] 以新成果、新情景为背景,综合考查杂交育种、诱变育种、单倍体育种和基因工程育种等原理、过程、特点及应用,是该类题型的重要特点,该题型是近几年来高考的热点,应重点把握。
如图所示,科研小组用60Co照射棉花种子,诱变当代获得棕色(纤维颜色)新性状,诱变Ⅰ代获得低酚(棉酚含量)新性状。
已知棉花的纤维颜色由一对等位基因(A、a)控制,棉酚含量由另一对等位基因(B、b)控制,两对基因遗传。
(1)两个新性状中,棕色是________性状,低酚是________性状。
(2)诱变当代中,棕色、高酚的棉花植株基因型是________,白色、高酚的棉花植株基因型是____________。
(3)棕色棉抗虫能力强,低酚棉产量高。
为获得抗虫高产棉花新品种,研究人员将诱变Ⅰ代中棕色、高酚植株自交,每株自交后代种植在一个单独的区域,从__________________的区域中得到纯合棕色、高酚植株。
请你利用该纯合子作为一个亲本,再从诱变Ⅰ代中选择另一个亲本,设计一方案,尽快选育出抗虫高产(棕色、低酚)的纯合棉花新品种(用遗传图解和必要的文字表示)。
答案(1)显性隐性(2)AaBB aaBb(3)不发生性状分离(或全为棕色棉,或没有出现白色棉)表现为棕色、低酚(AAbb)性状的植株即为需要选育的新品种。
解析(1)由图中突变当代自交后发生性状分离可知,棕色性状是显性性状,低酚是隐性性状。
(2)因为棕色性状是显性性状,低酚是隐性性状,所以突变当代棕色、高酚的棉花植株基因型是AaBB,白色、高酚的棉花植株基因型是aaBb。
(3)突变当代棕色、高酚的棉花植株(AaBB)自交,得到诱变Ⅰ代中棕色、高酚植株基因型有两种:AABB和AaBB。
它们分别自交,后代种植在一个单独的区域,AaBB出现性状分离,而AABB不出现性状分离(全为棕色棉,没有出现白色棉),可以获得纯合棕色、高酚植株。
2023年中考英语一轮复习语法知识专项突破-时间状语从句(含答案解析)

2023年中考英语一轮复习语法知识专项突破-时间状语从句一、选择题Aunt Lucy will tell us something about her trip to Australia when she _____ back. A.came B.comes C.would come D.will comeHe is going to be a scientist when he _____.A.grows up B.grow upC.is going to grow up D.grew upShe _____ a math teacher when she grows up.A.is B.be C.am D.is going to be—Please tell Jim to call me as soon as he _____ back.—All right. I will.A.came B.come C.will come D.comes—Our new teacher has _____ to Beijing. How can I get in touch with her —Don't worry. She will phone you as soon as she _____ there.A.been; will get B.been; gets C.gone; will get D.gone; getsI will do some cleaning as soon as I _____ my homework.A.finish B.will finish C.has finished D.finishedYou can play computer games as soon as you _____ doing the housework. A.will finish B.finish C.finishes D.finishedHenry will give us a report as soon as he _____.A.arrives B.arrived C.is arriving D.will arriveI _____ Tim the news as soon as I see him tomorrow.A.tell B.told C.will tell D.have toldHenry will give us a report as soon as he _____ time.A.has B.had C.will arrive D.haveAs soon as he _____ here, we will give him the ticket.A.arrive B.arrives C.will arrive D.arrived—Dad, I'm wondering when Mum _____ home. I miss her very much.—She will get back when she _____ her work.A.returns; finishes B.returns; will finishC.will return; finishes D.will return; will finish—I'm afraid the class has begun.—Don't worry. It _____ until the bell _____.A.doesn't begin; rings B.won't begin; will ringC.won't begin; rings D.doesn't begin; will ringI will call you as soon as he _____ back. You can go home now.A.come B.came C.comes D.will comeI will go home for the vacation as soon as I _____ my exam.A.will finish B.finish C.finishing D.finishedAfter we pass the exams,we _____ by having a party next week. A.celebrated B.celebrate C.have celebrated D.will celebrateTony _____ a new motorcycle as soon as he gets his salary (薪水) tomorrow. A.buys B.bought C.has bought D.will buy—I will go to Guangdong for my summer holidays, mom.—I will meet you when you _____ the airport.A.will reach B.reaches C.reached D.reachMy brother wants to be a pilot when he _____.A.will grow up B.grew up C.is growing up D.grows upWhen he _____, he is going to be an excellent engineer like his father.A.gets up B.grows up C.will get up D.wu grow up—Linda has _____ to Paris. How can I get in touch with her—Don't worry. She will call you as soon as she _____ there.A.been; will get B.been; gets C.gone; will get D.gone; gets—I don't know when _____ tomorrow.—I will call you as soon as he _____.A.he will come; will arrive B.he will come; arrivesC.will he come; arrivesI _____ you as soon as I arrive in Beijing.A.call B.called C.will call D.is callingWe will go on with the match as soon as it _____.A.will stop raining B.stops rainingC.stop to rain D.isn't rainI will telephone you when he _____ back.A.comes B.will come C.come D.cameThe police _____ whether there is anyone injured when they arrive at the scene of an accident.A.checked B.will check C.are checking D.have checked根据语境,选出最佳选项。
2025年高三一轮复习物理课件专项突破4四类典型的类碰撞模型

从能量角度看,系统损失的动能全部转化为系统因摩擦而产生的内能:
1
1
Q=fx 相对=2m0 2 -2(M+m)v2=2(+) 0 2
情境
f 为子弹或滑块受到的阻力,x 相对为子弹相对木块或滑块相对长木板的位移
子弹射穿木块(或滑块滑离木板)(此种情境类似于非弹性碰撞)
D.若 v0 较小,则可能是图 1 所示情形;
若 v0 较大,则可能是图 2 所示情形
9
专项突破4
解析
d=
0
1+
=
2(+) 2
2 0 2
10
由动量守恒定律有 mv0=(M+m)v。对木块,由动量定理有 ft=Mv,解得
0
t=(+)
=
0 2
四类典型的类碰撞模型
然后反向加速,t2 时刻,弹簧恢复原长状态,因为此时两物块速度相反,故弹簧的长度将逐
渐增大,两物块均减速,t3 时刻,两物块速度相等,系统动能最小,弹簧最长,A 项错误;从 t3
到 t4 过程中弹簧由伸长状态恢复原长,B 项错误;系统动量守恒,从 t=0 开始到 t1 时刻有
m1v1=(m1+m2)v2,将 v1=3 m/s,v2=1 m/s 代入得 m1∶m2=1∶2,C 项正确;在 t2 时刻,A 的速
1
0 2
1+
1
,则 M 越大,d 越大,B 项正确;对木块由动能定理有 fx= Mv2,解得
+
x=2(+ )2 f,则 =
2023年中考英语一轮复习语法知识专项突破-形容词(含解析)

2023年中考英语一轮复习语法知识专项突破-形容词、一、选择题、1.The hotel is the best here. It has _____ rooms.A.the worse B.most comfortableC.best D.the most comfortable2.The little Johnny sweeps the floor very often to make the house _____.A.cool B.warm C.clean D.large3.The Amazon Rainforest is one of _____ wettest places in the world.A.a B.an C.the D./4.The population of Shenzhen is _____ than that of many other cities in China.A.large B.larger C.largest D.the largest5.—It's _____ for you to play football on the street.—Sorry, we won't. Thank you.A.wonderful B.dangerous C.understanding6.Now Huawei mobile phones made in China are very popular. They look _____ and sell _____.A.good; well B.good; good C.well; good D.well; well7.—John got an "A" in the physics exam.—I'm not _____ to hear that. He worked really hard this term.A.sorry B.excited C.happy D.surprised8.—What a pity! I didn't get full marks in the physics test.—Come on! Nobody can make everything _____.A.perfect B.useful C.natural D.active9.The boy didn't work _____ the exam.A.enough hard to pass B.hard enough to pastC.hard enough to pass D.hard enough passing10.Jason's has _____ quality clothes _____ Trendy Teen's.A.more; than B.better; than C.the best; than D.best; of11.In the reading class, the _____ you are, the _____ you can find answer in the passage.A.careful; easily B.more careful; more easilyC.carefuler: easier D.more careful: easier12.Always doing the same thing is really very _____. I don't like it.A.interesting B.relaxing C.boring D.exciting13.Susan never gets upset when she has to wait in line. She is very .A.shy B.honest C.funny D.patient14.—I think it's necessary to learn how to work in groups.—I quite agree. Sometimes it's even _____ than grades.A.less important B.more importantC.importanter D.the most important15.—The doctor told me not to eat too much, but I find it difficult.—The doctor is right. _____ you eat, _____ you will be.A.The less; the healthier B.The less; the more healthierC.The more; the healthier D.The more; the more healthier16.Red lanterns are _____ things at Spring Festival.A.funny B.traditional C.interesting D.special17.—Come here and have a look, Andy! What about the sweater?—Its style is very _____. I'll take it.A.expensive B.popular C.smooth D.comfortable18.—Do you like these books?—No, I don't. I think they are _____.A.boring B.free C.fun D.relaxing19.—Tina, can you lend me _____ money for this book?—Sorry, I don't have _____ money for that.A.some; enough B.some; some C.any; any D.any; enough20.—How much does your new dress cost?—It's not _____. It's only 80 yuan.A.good B.high C.cheap D.expensive21.—Do you think the old machine is _____, grandma?—Yes, it is _____ for carrying water.A.use; using B.useful; used C.use; used D.useful; use22.The man is _____ and he has _____.A.enough old; enough money B.old enough; enough moneyC.old enough; money enough D.enough old; money enough23.In most countries, people usually eat _____ food on special holidays.A.cheap B.creative C.salty D.traditional24.Maths is one of Peter's _____.A.the worst subjects B.worst subjectC.worse subject D.worst subjects25.—What do you think of the new English teacher?—I think no one is _____. She is a very kind person.A.good B.better C.bad D.worse26.The telephone is _____. I can call my friends with it.A.healthy B.difficult C.useful D.relaxing27.—Why would you like to go to Wanda Cinema IMAX to watch the new movie?—Because it has _____ seats and we can sit _____.A.the biggest; most comfortably B.biggest; the more comfortablyC.bigger; more comfortable28.My father has _____ eating habits, and he eats _____ every day.A.good; good B.good; well C.well; well D.well; good29.—Let's go to the school library, Alice.—I am very _____ now. What about this afternoon?A.busy B.happy C.tidy D.healthy30.I love Kung fu Panda very much. It's _____.A.difficult B.boring C.interesting D.free 31.—You know what? This year we have 3 P.E. lessons every week.—Great! It's really _____ for us students to have a strong body.A.important B.interesting C.special D.different32.—I heard people can't eat or drink on the subway in Hefei.—Yes. In order to have a more _____ space, we need to do that.A.personal B.relaxing C.exciting D.comfortable33.Kevin is really a _____ boy. His room is always in a mess, and he never tidies it up.A.wise B.lazy C.powerful D.magical34.I think history is very _____, and I like it.A.boring B.interesting C.favorite D.difficult35.It's so _____. How about having a cold drink with me in the coffee shop?A.late B.cool C.hot D.wet36.—Hi, Lucy. Are you _____ now?—Yes. I have a lot of things to do.A.busy B.free C.easy D.great37.I don't believe that this _____ boy can paint such a nice picture.A.five years old B.five-years-old C.five-year-old D.five year old38.I like the silence in the countryside. The city is too _____ for me.A.boring B.large C.noisy D.crowded39.—Sonia's English is very _____.—Yeah! And she speaks French (法语) very _____.A.good; well B.well; good C.good; good D.well; well40._____ exercise you take, _____ you'll be.A.The fewer, the heavier B.The less, the heavierC.The less, the much heavier41.We went to the _____ restaurant in town last night. The menu had only ten dishes and the service wasnot good at all.A.bad B.worse C.worst42.—How are you today?—I am much _____. I think this medicine is good for me.A.well B.better C.worse43.Jet sings _____ and he is a _____ singer (歌手).A.good; good B.good; well C.well; good44.If there is _____ pollution, the air in our city will be _____ dirtier.A.more; much B.less; more C.more; more45.Dumpling House is _____ restaurant in the city. You can get a big plate of dumplings for only five yuan.A.cheaper B.cheapest C.the cheapest46.I often fail in English tests, but have a good result in Maths tests. So I think English is _____ Maths.A.as easy as B.as difficult asC.not so difficult as D.not so easy as47.The _____ took on the young man's face made us _____.A.surprised; surprised B.surprising; surprisedC.surprising; surprising D.surprised; surprising48._____ useful information she got yesterday! She seemed _____ when she got it.A.What a, to be happy B.What, happyC.How, happy49.The little girl is _____ to go to school, but her father doesn't have _____ for her study.A.old enough, enough money B.enough old, money enoughC.old enough, enough moneys50.Happiness is very important. _____ you live, _____ you are. So try your best to make yourself happy everyday.A.The happier, the healthierB.The more happily, the more healthilyC.The more happily, the healthier答案一、选择题(共50题)1. 【答案】D【解析】句意:这家旅馆是这儿最好的,它有最舒适的房间。
中考语文一轮专项突破议论文复习(二)

议论文专题复习(二)【精准突破】一、信息提取筛选二、材料衔接题三、议论文语言特色三、议论文语言特色四、标题与词句的含义五、语段作用分析六、谈感受、评价等开放性试题【精讲精练】一、阅读下面的文章,回答以下各题。
独处是生命的良田韩青①我一直认为,群居往往是肤浅的、浮躁的、表象的,而独处往往是深刻的、安静的、本质的。
要知道,人多的时候,唇枪舌剑,熙熙攘攘,人心难以安静,而心不能安静,就不能深入地思考、探究,这样一来,自然不会把事做好;而独处的时候,人是安静的、自由的,可以思考、探究自己喜欢的事情,这样一来,就会遇到很多的奇迹或是意想不到的美好。
②再说,世间的任何一种美好,都有它自己的规律和节奏,一般来说,它需要我们的安静、沉思、专心和孤独,没有这些元素,我们就难以遇见它,而这些元素也只有在我们独处的时候才有。
就是说,独处的时候,就是我们与美好相逢的时候。
比如,牛顿发现万有引力定律,爱因斯坦发现相对论,爱迪生发明电灯,马克思写《资本论》,司马迁写《史记》,曹雪芹写《红楼梦》等等,他们的“作品”都是独处时结出的硕果。
③俗话说,热闹的大街不长草。
热闹之所,连草都不长了,还能长什么好东西呢?能长的,只能是浮躁、杂乱、庸俗之类的东西。
而一个人如果被这些东西主宰了,那么他就不可能还有追求和梦想;一个没有追求和梦想的人,就会变得日益庸俗乃至低俗。
这样的人就像小水洼,一有什么风吹草动,他就会躁动不安。
显而易见,这样的人没有定力,而没有定力的人,往往就没有恒心;没有恒心的人,就很难做成大事。
④美国女诗人艾米莉•狄金森深谙此道。
她不喜欢热闹、喧哗,深爱独处,在她的一生中,除了年轻时有一次长途旅行外,几乎都在乡间隐居。
在那期间,她写了近两千首的诗,而且,诗歌结集出版后引起轰动,人们因此誉她为二十世纪现代主义诗歌的先驱之一。
如果她不喜欢独处,常常跟人在一起嬉戏玩耍、虚掷光阴,那么她就不会有这样的成就,更可怕的是,如果她交上了坏朋友或染上了坏习气,那么她的品质就可能开始变坏。
2023年中考英语一轮复习语法知识专项突破-非谓语动词(含答案解析)

2023年中考英语一轮复习语法知识专项突破-非谓语动词一、选择题—Mr Lee is an animal-lover. He always does everything he can _____ animals.—Oh, he is a true friend of animals'.A.to hunt B.hunting C.to protect D.protecting—Do you know why he left so early The show was so wonderful.—_____ for the English test, I guess.A.Study B.Studied C.To study D.StudyingHe tried different ways he could think of _____ English well.A.learns B.to learn C.learning D.learned—Did the book give you all the information you wanted—Yes, but _____ it, I had to read the whole book.A.find B.found C.finding D.to find—Why do you come to school so early —_____ the classroom. I'm on duty (值日) today.A.Clean B.Cleaning C.To clean D.Cleaned_____ other students, Li Wei did a better job in this competition.A.Compare with B.Compared with C.Compare to—Your English has improved a lot. How did you do it—I promised Ms Wang to practice English every day and I _____ my words.A.got lost B.stuck to C.listenedTony is new here. He doesn't know _____ .A.how to get to the bank B.how can he get to the bankC.where is the bank—Look, Linda looks worried.—Yes, She didn't know French, but she was made _____ to sing a French song in two days.A.mention B.learn C.to mention D.to learn—We can use WeChat (微信) to talk with each other.—Really Would you show me _____ itA.what to use B.how to useC.what can I use D.how can I use—Boys and girls, I have something exciting _____ you.—Really What's itA.tell B.telling C.to tell D.toldI got up early this morning _____ my best friend at the train station.A.to meet B.meeting C.met D.meet—Mom, I need a special pen to draw this picture.—OK. Let's go to the supermarket _____ one.A.buy B.buys C.buying D.to buyMr. Li is a kind-hearted man. He does everything he can _____ homeless people. A.helped B.helping C.help D.to help—As a new student, Jack doesn't know _____ in our class.—Let's go and help him.A.what to expect B.when to expect C.how to expect D.who to expectCan you tell me _____ to do nextA.when B.why C.what D.how—Could you tell me _____—Sorry, I have no idea.A.that there is a bank nearby B.what's the shirt made ofC.how to deal with the problem D.how soon he would come back—Could you help me with my English—Yes, of course. I'll do what I can _____ you.A.help B.to help C.helpingAs volunteers, we could do something we can _____ those sick kids. A.encourage B.to encourage C.encouraging—Could you tell me _____ to meet Miss Li—Please fill in this form and call her to meet you.A.how B.where C.when—Excuse me. Could you please tell me _____ my car—Sure. Park it right here.A.how to stop B.where to park C.where to stop D.when to parkEddie is hungry and too weak _____ any further.A.walk B.to walk C.walked D.walkingAs a new student, Jack doesn't know _____ in our class.A.what to expect B.when to expect C.how to expect D.who to expect_____ from the moon, our earth, with water _____ seven percent of its surface, appears as "blue ball".A.Seen; covered B.Seeing; coveringC.Seen; covering D.To see; to cover—Mum, the flowers are so beautiful. Let's pick some.—Oh, dear. We shouldn't pick flowers in the park. Just leave them _____.A.to grow B.growing C.grow D.grownCan you find a new way _____ out this Maths problemA.to work B.worked C.working D.to workingMy sister is a book lover and she enjoys _____ very much.A.read B.reading C.to read D.to readingLucy has few close friends, so she really doesn't know _____ about her problems. A.who to speak B.who to talk withC.who to say D.what to talk_____ water is easy to _____.A.Drinking polluted; get ill B.To drink pollution; get illC.To drink polluted; make ill D.Drinking pollution; make ill_____ is a great way _____ English.A.Note; to learn B.To note; learnC.Noting; learn D.Noting; to learn从下面各题所给选项中,选择最佳选项。
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角函数与向量” 的突破技巧 , 相信能够 让同学们受益匪浅。 英语 : 作为英语基础知识之一的
词汇在高三复习的过程中起着举足轻
重的作用。 在词汇复习中, 动词的用法
历来都是 高考英语考查 的重 点 , 本期
英语学科选取了《 动词时态突破 : 比 对
是关键》 过 去分词 突破 : 和《 巧用句子 成分》 两篇文章 , 详细讲解动词的时态
・
一
轮复习专项突破
1 月是高考复习的关键时期, 1 高考一轮复习进行得如火如荼。 每一个科目的
老师都 在逐册逐章节地进行地毯式复习, 同学们 也应该和老 师的步伐一致 , 充分 逐篇逐
段, 甚至逐字逐句地进行复习, 做到毫无遗 漏。 0
这次考试的 目的除 了查漏补缺外 . 还 有一层特殊的涵义 : 它是高校招生 中
一
图囡匿 盈 银烛 秋光冷画屏。 小扇扑流萤 轻罗 。杜 牧《 秋夕》
曩
考试 。
保送 、 推荐 、 评选市级三好学生的重要
依据 。特别提醒有意参加这些特殊招
生考试 的高三同学 , 要格外重视这次
下 期学 科 选题 预 告 :二 轮 复 习专
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高每釜 刊■
31
专题 一 轮复习专
《高考金刊》 1 t 月号学科策划“ -轮复习专项突破” 根据高三复习进度, 对一 轮复习的基础知识进行巩固, 选择其中一些难点进行专项突破, 让同学们夯实基
础 从而以更好的状态进 入到下一轮的复 习当中。
重点介绍了“ 函数”数列”不等式”三 “ “ “
●
●
接的成分来判断 a d的用法;易混词 n 《 汇突破 : 巧用组合记 忆》 收集整理 了大 量高考高频考查 的易混词汇 , 通过对 比记忆帮助同学们掌握这些词汇 。
} 定 要过 。 i i i 不错 哦
除了基础知识复习 以外 , 在一轮
复习阶段 , 我们还有一项重要任务 。 这
就 是 准 备 高 三 第 一 学 期 的期 末 考 试 。
和过去分词 的用法 , 同学们扫除动 让
词复习障碍 . 掌握得分关键: 连词考查
中 . 似简 单但 考查 频 率 却极 高 的 看
a d是最容 易被 同学们忽 视的 . n 这种 忽视会直接导致 同学们在做题的过程 中丢分 ,ad突破 : <n < 辨析前后 连接》 将
教会同学们如何通过辨析 a d n 前后连