【宝山大华】2017年徐汇区西南模范中学初三3月月考卷

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上海西南模范中学初三初三化学上册期中模拟试题(含答案)

上海西南模范中学初三初三化学上册期中模拟试题(含答案)

上海西南模范中学初三化学上册期中模拟试题(含答案)一、选择题(培优题较难)1.质量相等的两份固体,然后分别放在酒精灯上均匀受热,放出氧气的质量(m)随反应时间(t)变化的函数图像(如图,a为纯净的氯酸钾,b为加入了高锰酸钾的氯酸钾),正确的是( )A.B.C.D.2.中华传统文化博大精深。

下列古诗中不涉及...化学变化的是()A.日照香炉生紫烟,遥看瀑布挂前川B.爆竹声中一岁除,春风送暖入屠苏C.粉身碎骨浑不怕,要留清白在人间D.春蚕到死丝方尽,蜡炬成灰泪始干3.锌是促进人体生长发育的必须微量元素。

下图为锌元素在元素周期表中的相关信息及原子结构示意图。

下列说法正确的是()A.锌属于非金属元素B.锌原子的中子数为30C.锌的相对原子质量为65.38g D.锌原子在化学反应中易失去电子形成Zn2+ 4.下列有关实验操作的“先”与“后”的说法中,正确的是()A.制取气体时,先装药品,后检查装置的气密性B.用托盘天平称量10g固体药品时,先放砝码,后放药品C.用滴管取细口瓶内的液体时,先将其伸入液体内,后挤压取液D.加热KMnO4并用排水法收集O2的实验结束时,先熄灭酒精灯,后移出导管5.下列是几种粒子的结构示意图,有关它们的叙述,你认为正确的是A.②表示的是阴离子B.①②③④表示的是四种不同元素C.③属于金属元素D.①③所表示的粒子化学性质相似6.用下图装置进行实验。

下列现象能证明空气中O2的含量的是()A.红磷燃烧,产生白烟B.瓶中液面先下降,后上升C.瓶中液面最终上升至1处D.水槽中液面下降7.下列关于CO2的实验室制法及性质实验的说法不正确的是()A、制CO2的药品B、发生装置C、收集装置D、比较CO2与空气的密度A.A B.B C.C D.D 8.河水净化的主要步骤如下图所示。

有关说法错误的是A.步骤Ⅰ可出去难溶性杂质B.X试剂可以是活性炭C.步骤Ⅲ可杀菌.消毒D.净化后的水是纯净物9.硼是作物生长必需的微量营养元素,硼元素的相关信息如图所示。

上海名校英语--2017学年上海市徐汇区西南模范九年级上学期周测试卷

上海名校英语--2017学年上海市徐汇区西南模范九年级上学期周测试卷

Part 2 Phonetics, Grammar and Vocabulary(第二部分语音、语法和词汇)I.Choose the best answer(选择最恰当的答案)26. Which of the following underlined parts is different in pronunciation from others?A. He washed his hands.B. They stopped us from coming inC I walked home last night.D.Louise opened a bottle of wine答案:DA.[wɔʃt].B.[stɒpt]C. [wɔːkt] D ['əʊpənd]27. It's wrong you to leave the washing machineA. for... funB. of. runningC for. runningD. of. run答案:B,It’s +adj+of sb,其中adj为形容人时用of,不能用for,leave sth doing28. You will be out of date you keep on studying from time to time.A ifB, unlessC becauseD.Or答案:B,根据句意,你将会过时,除非你有时保持学习,选unless29.Don’t you think travelling by train is and far ?A more quickly .. more easilyB more quickly.. easierC.quicker, easlierD.quicker, more easily答案:C,根据far可知用比较级,用副词easily的比较级,前面是is,所以用adj,用quick的比较级30. He supposed that keeping pet dogs wasn't a good idea, ?A. was itB wasn’t itC. did heD. didn't he答案:D,宾语从句的反义疑问句,当主语是第三人称时,反主句,所以用did,在根据前否后肯,所以用didn’t he?31)I would rather at than give up this precious opportunity.A be laughedB laughC to laughD to be laughed答案:A,would rather do 的用法,排除CD,根据句意应用被动语态,与放弃珍贵的机会相比,我宁被嘲笑32.She’s announced that she her third chain store in a monthA had openedB would openC openedD. will open答案:D,由in a month ,可知用将来时,选D,她已经宣布她在一个月之后将开立她的第三家连锁店33. He watched the patient through the windowA closely, closeB close, closedC closely, closedD. close, closing答案:C,根据词性判断第一个空是adv,第二个是adj,他通过这个关着的窗户近近地看着这个病人34.The teacher asked us not to do the experiments by ourselvesA.physics, physicsB. physics, physicalC. physical, physicalD physical, physics.答案:B,学科老师的表达方法是学科直接加老师,所以第一个是physics,第二个空缺adj,所以用physical35. The light suddenly after the storm.A. went outB.went offC .went onD. went over答案:A,根据句意,这个灯突然熄灭了,在这场风暴以后,go out 是熄灭,go off 是爆炸,go on 是继续,go over 是复习36. When she came several days later, sfe found that all things still where shehad them.A. lay: laidB. laid: laidC lay: lainD. lying: lain答案A,find sb do ,所以第一个空用平躺的原型lay,第二个空她已经放的地方,用放置的过分laid,当她几天以后回来以后,她发现所有的东西还躺在他已经放的地方.37. A poet and artist coming to speak to us about Chinese literature and painting tomorrow afternoonA.isB. AreC.wasD, were答案:A,主语a poet and artist,指的是一个人,一个诗人兼艺术家,所以谓语动词是三单,主语而不是a poet and an artist.38. Helen her keys in the office so she had to wait until her husband homeA. has left; comes B, left; had comeC had left: cameD had left: would come答案:C,根据句意第一个空用完成时,后句有个had to ,所以用过去式,所以第一个空是过完,第二个空是came39. We’re to listen to her voice. It's to hear her sing.A. pleased; pleasant; a pleasureB pleasing; pleasant; pleasureC pleased; pleasing; pleasureD pleasing; pleased; a pleasure答案:A,根据词性判断前两个空是adj,前者修饰人用pleased,后者用来修饰物,所以用pleasant,第三个空用名词,It is a pleasure to do sth40. Under a big tree , half asleepA did sat a fat manB a fat man satC.did a fat man satD.sat a fat man答案:D,根据句意,在一个大树下,坐着一个胖人,快睡着了41. He slipped and broke his arm . ,he will have to be away from school for two or three monthsA. In any caseB.After allC As a resultD. In this way答案:C,根据句意,他滑到了摔坏了胳膊,所以,他必须休学2-3个月,A是在任何情况下,B是毕竟,C是所以,D,是用这种方法。

上海西南模范中学初三数学九年级上册期末模拟试题(含答案)

上海西南模范中学初三数学九年级上册期末模拟试题(含答案)

上海西南模范中学初三数学九年级上册期末模拟试题(含答案)一、选择题1.在半径为3cm 的⊙O 中,若弦AB =32,则弦AB 所对的圆周角的度数为( ) A .30° B .45° C .30°或150° D .45°或135° 2.下列关于x 的一元二次方程,有两个不相等的实数根的方程的是( ) A .x 2+1=0B .x 2+2x +1=0C .x 2+2x +3=0D .x 2+2x -3=03.如图,矩形ABCD 中,3AB =,8BC =,点P 为矩形内一动点,且满足PBC PCD ∠=∠,则线段PD 的最小值为( )A .5B .1C .2D .34.若关于x 的方程 ()2m 110x mx -+-= 是一元二次方程,则m 的取值范围是( ) A .m 1≠.B .m 1=.C .m 1≥D . m 0≠.5.已知Rt △ABC 中,∠C=900,AC=2,BC=3,则下列各式中,正确的是( )A .2sin 3B =; B .2cos 3B =;C .2tan 3B =; D .以上都不对;6.函数y=(x+1)2-2的最小值是( )A .1B .-1C .2D .-27.把二次函数y =2x 2的图象向右平移3个单位,再向上平移2个单位后的函数关系式是( )A .22(3)2y x =-+B .22(3)2y x =++C .22(3)?2y x =-D .22(3)?2y x =+8.若关于x 的方程20ax bx c ++=的解为11x =-,23x =,则方程2(1)(1)0a x b x c -+-+=的解为( )A .120,2x x ==B .122,4x x =-=C .120,4x x ==D .122,2x x =-= 9.已知⊙O 的直径为4,点O 到直线l 的距离为2,则直线l 与⊙O 的位置关系是 A .相交 B .相切 C .相离 D .无法判断 10.一组数据0、-1、3、2、1的极差是( )A .4B .3C .2D .111.某同学在解关于x 的方程ax 2+bx +c =0时,只抄对了a =1,b =﹣8,解出其中一个根是x =﹣1.他核对时发现所抄的c 是原方程的c 的相反数,则原方程的根的情况是( )A .有两个不相等的实数根B .有两个相等的实数根C .有一个根是x =1D .不存在实数根12.下列对于二次函数y=﹣x2+x图象的描述中,正确的是()A.开口向上B.对称轴是y轴C.有最低点D.在对称轴右侧的部分从左往右是下降的13.如图,点P(x,y)(x>0)是反比例函数y=kx(k>0)的图象上的一个动点,以点P为圆心,OP为半径的圆与x轴的正半轴交于点A,若△OPA的面积为S,则当x增大时,S的变化情况是()A.S的值增大B.S的值减小C.S的值先增大,后减小D.S的值不变14.如图,点A,B,C,D的坐标分别是(1,7),(1,1),(4,1),(6,1),以C,D,E为顶点的三角形与△ABC相似,则点E的坐标不可能是A.(6,0)B.(6,3)C.(6,5)D.(4,2)15.二次函数y=ax2+bx+c(a≠0)的图象如图,给出下列四个结论:①4ac﹣b2<0;②4a+c<2b;③3b+2c<0;④m(am+b)+b<a(m≠﹣1),其中正确结论的个数是()A.4个B.3个C.2个D.1个二、填空题16.如图,△ABC中,D、E分别在AB、AC上,DE∥BC,AD:AB=1:3,则△ADE与△ABC 的面积之比为______.17.如图,在半径为3的⊙O 中,直径AB 与弦CD 相交于点E ,连接AC ,BD .若AC =2,则cosD =________.18.如图是一个可以自由转动的转盘,转盘分成6个大小相同的扇形,颜色分为红、绿、黄三种颜色.指针的位置固定,转动的转盘停止后,其中的某个扇形会恰好停在指针所指的位置(指针指向两个扇形的交线时,当作指向右边的扇形).转动一次转盘后,指针指向_____颜色的可能性大.19.如图,已知Rt ABC ∆中,90ACB ∠=︒,8AC =,6BC =,将ABC ∆绕点C 顺时针旋转得到MCN ∆,点D 、E 分别为AB 、MN 的中点,若点E 刚好落在边BC 上,则sin DEC ∠=______.20.若a b b -=23,则ab的值为________. 21.二次函数y=x 2−4x+5的图象的顶点坐标为 .22.若点C 是线段AB 的黄金分割点且AC >BC ,则AC =_____AB (用含无理数式子表示).23.如图,在ABC 中,62BC =,45C ∠=︒,2AB AC =,则AC 的长为________.24.二次函数2y ax bx c =++的图像开口方向向上,则a ______0.(用“=、>、<”填空)25.一种药品经过两次降价,药价从每盒80元下调至45元,平均每次降价的百分率是__.26.“上升数”是一个数中右边数字比左边数字大的自然数(如:34,568,2469等).任取一个两位数,是“上升数”的概率是_________ .27.如图,在边长为 6 的等边△ABC 中,D 为 AC 上一点,AD=2,P 为 BD 上一点,连接 CP ,以 CP 为 边,在 PC 的右侧作等边△CPQ ,连接 AQ 交 BD 延长线于 E ,当△CPQ 面积最小时,QE=____________.28.设1x 、2x 是关于x 的方程2350x x +-=的两个根,则1212x x x x +-•=__________.29.设二次函数y =x 2﹣2x ﹣3与x 轴的交点为A ,B ,其顶点坐标为C ,则△ABC 的面积为_____.30.如图,在△ABC 中,P 是AB 边上的点,请补充一个条件,使△ACP ∽△ABC ,这个条件可以是:___(写出一个即可),三、解答题31.二次函数y =ax 2+bx +c 中的x ,y 满足下表 x … -1 0 1 3 … y…31…不求关系式,仅观察上表,直接写出该函数三条不同类型的性质: (1) ; (2) ; (3) .32.(1)解方程:27100x x -+= (2)计算:cos60tan 452cos 45︒⨯︒-︒33.如图,二次函数22y ax ax c =-+ (a < 0) 与 x 轴交于 A 、C 两点,与 y 轴交于点 B ,P 为 抛物线的顶点,连接 AB ,已知 OA :OC=1:3. (1)求 A 、C 两点坐标;(2)过点 B 作 BD ∥x 轴交抛物线于 D ,过点 P 作 PE ∥AB 交 x 轴于 E ,连接 DE , ①求 E 坐标; ②若 tan ∠BPM=25,求抛物线的解析式.34.如图甲,直线y=﹣x+3与x 轴、y 轴分别交于点B 、点C ,经过B 、C 两点的抛物线y=x 2+bx+c 与x 轴的另一个交点为A ,顶点为P . (1)求该抛物线的解析式;(2)在该抛物线的对称轴上是否存在点M ,使以C ,P ,M 为顶点的三角形为等腰三角形?若存在,请直接写出所符合条件的点M 的坐标;若不存在,请说明理由; (3)当0<x <3时,在抛物线上求一点E ,使△CBE 的面积有最大值(图乙、丙供画图探究).35.如图①,抛物线y =x 2﹣(a +1)x +a 与x 轴交于A 、B 两点(点A 位于点B 的左侧),与y 轴交于点C .已知△ABC 的面积为6.(1)求这条抛物线相应的函数表达式;(2)在抛物线上是否存在一点P ,使得∠POB =∠CBO ,若存在,请求出点P 的坐标;若不存在,请说明理由;(3)如图②,M 是抛物线上一点,N 是射线CA 上的一点,且M 、N 两点均在第二象限内,A 、N 是位于直线BM 同侧的不同两点.若点M 到x 轴的距离为d ,△MNB 的面积为2d ,且∠MAN =∠ANB ,求点N 的坐标.四、压轴题36.如图1,△ABC 中,AB=AC=4,∠BAC=100,D 是BC 的中点.小明对图1进行了如下探究:在线段AD 上任取一点E ,连接EB .将线段EB 绕点E 逆时针旋转80°,点B 的对应点是点F ,连接BF ,小明发现:随着点E 在线段AD 上位置的变化,点F 的位置也在变化,点F 可能在直线AD 的左侧,也可能在直线AD 上,还可能在直线AD 的右侧.请你帮助小明继续探究,并解答下列问题:(1)如图2,当点F 在直线AD 上时,连接CF ,猜想直线CF 与直线AB 的位置关系,并说明理由.(2)若点F 落在直线AD 的右侧,请在备用图中画出相应的图形,此时(1)中的结论是否仍然成立,为什么?(3)当点E 在线段AD 上运动时,直接写出AF 的最小值.37.问题提出(1)如图①,在ABC 中,2,6,135AB AC BAC ==∠=,求ABC 的面积.问题探究(2)如图②,半圆O 的直径10AB =,C 是半圆AB 的中点,点D 在BC 上,且2CD BD =,点P 是AB 上的动点,试求PC PD +的最小值.问题解决(3)如图③,扇形AOB 的半径为20,45AOB ∠=在AB 选点P ,在边OA 上选点E ,在边OB 上选点F ,求PE EF FP ++的长度的最小值.38.如图,⊙M 与菱形ABCD 在平面直角坐标系中,点M 的坐标为(﹣3,1),点A 的坐标为(2,0),点B 的坐标为(1,﹣3),点D 在x 轴上,且点D 在点A 的右侧. (1)求菱形ABCD 的周长;(2)若⊙M 沿x 轴向右以每秒2个单位长度的速度平移,菱形ABCD 沿x 轴向左以每秒3个单位长度的速度平移,设菱形移动的时间为t (秒),当⊙M 与AD 相切,且切点为AD 的中点时,连接AC ,求t 的值及∠MAC 的度数;(3)在(2)的条件下,当点M 与AC 所在的直线的距离为1时,求t 的值.39.平面直角坐标系xOy 中,矩形OABC 的顶点A ,C 的坐标分别为(2,0),(0,3),点D 是经过点B ,C 的抛物线2y x bx c =-++的顶点. (1)求抛物线的解析式;(2)点E 是(1)中抛物线对称轴上一动点,求当△EAB 的周长最小时点E 的坐标; (3)平移抛物线,使抛物线的顶点始终在直线CD 上移动,若平移后的抛物线与射线..BD 只有一个公共点,直接写出平移后抛物线顶点的横坐标m 的值或取值范围.40.如图,正方形ABCD 中,点O 是线段AD 的中点,连接OC ,点P 是线段OC 上的动点,连接AP 并延长交CD 于点E ,连接DP 并延长交AB 或BC 于点F , (1)如图①,当点F 与点B 重合时,DEDC等于多少;(2)如图②,当点F 是线段AB 的中点时,求DEDC的值; (3)如图③,若DE CF ,求DEDC的值.【参考答案】***试卷处理标记,请不要删除一、选择题 1.D 解析:D 【解析】 【分析】根据题意画出图形,连接OA 和OB ,根据勾股定理的逆定理得出∠AOB =90°,再根据圆周角定理和圆内接四边形的性质求出即可. 【详解】 解:如图所示,连接OA ,OB , 则OA =OB =3, ∵AB =2, ∴OA 2+OB 2=AB 2, ∴∠AOB =90°,∴劣弧AB 的度数是90°,优弧AB 的度数是360°﹣90°=270°, ∴弦AB 对的圆周角的度数是45°或135°, 故选:D . 【点睛】此题主要考查圆周角的求解,解题的关键是根据图形求出圆心角,再得到圆周角的度数.2.D解析:D【解析】【分析】要判断所给方程是有两个不相等的实数根,只要找出方程的判别式,根据判别式的正负情况即可作出判断.有两个不相等的实数根的方程,即判别式的值大于0的一元二次方程.【详解】A、△=0-4×1×1=-4<0,没有实数根;B、△=22-4×1×1=0,有两个相等的实数根;C、△=22-4×1×3=-8<0,没有实数根;D、△=22-4×1×(-3)=16>0,有两个不相等的实数根,故选D.【点睛】本题考查了根的判别式,注意掌握一元二次方程ax2+bx+c=0(a≠0)的根与△=b2-4ac有如下关系:①当△>0时,方程有两个不相等的两个实数根;②当△=0时,方程有两个相等的两个实数根;③当△<0时,方程无实数根.3.B解析:B【解析】【分析】通过矩形的性质和等角的条件可得∠BPC=90°,所以P点应该在以BC为直径的圆上,即OP=4,根据两边之差小于第三边及三点共线问题解决.【详解】如图,∵四边形ABCD为矩形,∴AB=CD=3,∠BCD=90°,∴∠PCD+∠PCB=90°,∵PBC PCD∠=∠,∴∠PBC+∠PCB=90°,∴∠BPC=90°,∴点P在以BC为直径的圆⊙O上,在Rt△OCD中,OC=118422BC,CD=3,由勾股定理得,OD=5,∵PD≥OD OP ,∴当P,D,O三点共线时,PD最小,∴PD的最小值为OD-OP=5-4=1.故选:B.【点睛】本题考查矩形的性质,勾股定理,线段最小值问题及圆的性质,分析出P点的运动轨迹是解答此题的关键.4.A解析:A【解析】【分析】根据一元二次方程的定义可得m﹣1≠0,再解即可.【详解】由题意得:m﹣1≠0,解得:m≠1,故选A.【点睛】此题主要考查了一元二次方程的定义,关键是掌握只含有一个未知数,并且未知数的最高次数是2的整式方程叫一元二次方程.5.C解析:C【解析】【分析】根据勾股定理求出AB,根据锐角三角函数的定义求出各个三角函数值,即可得出答案.【详解】如图:由勾股定理得:22222133AC BC++==,所以cosB=313BCAB=,sinB=21233AC ACtanBAB BC===,所以只有选项C正确;故选:C.【点睛】此题考查锐角三角函数的定义的应用,能熟记锐角三角函数的定义是解此题的关键.6.D解析:D【解析】【分析】抛物线y=(x+1)2-2开口向上,有最小值,顶点坐标为(-1,-2),顶点的纵坐标-2即为函数的最小值.【详解】解:根据二次函数的性质,当x=-1时,二次函数y=(x+1)2-2的最小值是-2.故选D.【点睛】本题考查了二次函数的最值.7.A解析:A【解析】将二次函数22y x =的图象向右平移3个单位,再向上平移2个单位后的函数关系式为:22(3)2y x =-+.故选A.8.C解析:C【解析】【分析】设方程2(1)(1)0a x b x c -+-+=中,1t x =-,根据已知方程的解,即可求出关于t 的方程的解,然后根据1t x =-即可求出结论.【详解】解:设方程2(1)(1)0a x b x c -+-+=中,1t x =-则方程变为20at bt c ++=∵关于x 的方程20ax bx c ++=的解为11x =-,23x =,∴关于t 的方程20at bt c ++=的解为11t =-,23t =, ∴对于方程2(1)(1)0a x b x c -+-+=,11x -=-或3解得:10x =,24x =,故选C .【点睛】此题考查的是根据已知方程的解,求新方程的解,掌握换元法是解决此题的关键.9.B解析:B【解析】【分析】根据圆心距和两圆半径的之间关系可得出两圆之间的位置关系.【详解】∵⊙O 的直径为4,∴⊙O 的半径为2,∵圆心O 到直线l 的距离是2,∴根据圆心距与半径之间的数量关系可知直线l 与⊙O 的位置关系是相切.故选:B .【点睛】本题考查了直线和圆的位置关系的应用,理解直线和圆的位置关系的内容是解此题的关键,注意:已知圆的半径是r ,圆心到直线的距离是d ,当d =r 时,直线和圆相切,当d >r 时,直线和圆相离,当d <r 时,直线和圆相交.10.A解析:A【解析】【分析】根据极差的概念最大值减去最小值即可求解.【详解】解:这组数据:0、-1、3、2、1的极差是:3-(-1)=4.故选A .【点睛】本题考查了极差的知识,极差是指一组数据中最大数据与最小数据的差.11.A解析:A【解析】【分析】直接把已知数据代入进而得出c 的值,再解方程根据根的判别式分析即可.【详解】∵x =﹣1为方程x 2﹣8x ﹣c =0的根,1+8﹣c =0,解得c =9,∴原方程为x 2-8x +9=0,∵24b ac ∆=-=(﹣8)2-4×9>0,∴方程有两个不相等的实数根.故选:A .【点睛】本题考查一元二次方程的解、一元二次方程根的判别式,解题的关键是掌握一元二次方程根的判别式,对于一元二次方程()200++=≠ax bx c a ,根的情况由24b ac ∆=-来判别,当24b ac ->0时,方程有两个不相等的实数根,当24b ac -=0时,方程有两个相等的实数根,当24b ac -<0时,方程没有实数根.12.D解析:D【解析】【分析】根据题目中的函数解析式和二次函数的性质,可以判断各个选项中的结论是否正确,从而可以解答本题.【详解】解:∵二次函数y =﹣x 2+x =﹣(x 12-)2+14, ∴a =﹣1,该函数的图象开口向下,故选项A 错误;对称轴是直线x =12,故选项B 错误; 当x =12时取得最大值14,该函数有最高点,故选项C 错误; 在对称轴右侧的部分从左往右是下降的,故选项D 正确;故选:D .【点睛】本题考查了二次函数的性质,掌握函数解析式和二次函数的性质是解题的关键.13.D解析:D【解析】【分析】作PB ⊥OA 于B ,如图,根据垂径定理得到OB =AB ,则S △POB =S △PAB ,再根据反比例函数k 的几何意义得到S △POB =12|k |,所以S =2k ,为定值. 【详解】作PB ⊥OA 于B ,如图,则OB =AB ,∴S △POB =S △PAB . ∵S △POB =12|k |,∴S =2k ,∴S 的值为定值. 故选D .本题考查了反比例函数系数k的几何意义:在反比例函数y=kx图象中任取一点,过这一个点向x轴和y轴分别作垂线,与坐标轴围成的矩形的面积是定值|k|.14.B解析:B【解析】试题分析:△ABC中,∠ABC=90°,AB=6,BC=3,AB:BC=2.A、当点E的坐标为(6,0)时,∠CDE=90°,CD=2,DE=1,则AB:BC=CD:DE,△CDE∽△ABC,故本选项不符合题意;B、当点E的坐标为(6,3)时,∠CDE=90°,CD=2,DE=2,则AB:BC≠CD:DE,△CDE与△ABC不相似,故本选项符合题意;C、当点E的坐标为(6,5)时,∠CDE=90°,CD=2,DE=4,则AB:BC=DE:CD,△EDC∽△ABC,故本选项不符合题意;D、当点E的坐标为(4,2)时,∠ECD=90°,CD=2,CE=1,则AB:BC=CD:CE,△DCE∽△ABC,故本选项不符合题意.故选B.15.B解析:B【解析】【分析】【详解】解:∵抛物线和x轴有两个交点,∴b2﹣4ac>0,∴4ac﹣b2<0,∴①正确;∵对称轴是直线x﹣1,和x轴的一个交点在点(0,0)和点(1,0)之间,∴抛物线和x轴的另一个交点在(﹣3,0)和(﹣2,0)之间,∴把(﹣2,0)代入抛物线得:y=4a﹣2b+c>0,∴4a+c>2b,∴②错误;∵把(1,0)代入抛物线得:y=a+b+c<0,∴2a+2b+2c<0,∵b=2a,∴3b,2c<0,∴③正确;∵抛物线的对称轴是直线x=﹣1,∴y=a﹣b+c的值最大,即把(m,0)(m≠0)代入得:y=am2+bm+c<a﹣b+c,∴am2+bm+b<a,即m(am+b)+b<a,∴④正确;即正确的有3个,考点:二次函数图象与系数的关系二、填空题16.1:9.【解析】试题分析:由DE∥BC,可得△ADE∽△ABC,根据相似三角形的面积之比等于相似比的平方可得S△ADE:S△ABC=(AD:AB)2=1:9.考点:相似三角形的性质.解析:1:9.【解析】试题分析:由DE∥BC,可得△ADE∽△ABC,根据相似三角形的面积之比等于相似比的平方可得S△ADE:S△ABC=(AD:AB)2=1:9.考点:相似三角形的性质.17.【解析】试题分析:连接BC,∴∠D=∠A,∵AB是⊙O的直径,∴∠ACB=90°,∵AB=3×2=6,AC=2,∴cosD=cosA===.故答案为.考点:1.圆周角定理;2.解直角三角形解析:1 3【解析】试题分析:连接BC,∴∠D=∠A,∵AB是⊙O的直径,∴∠ACB=90°,∵AB=3×2=6,AC=2,∴cosD=cosA=ACAB=26=13.故答案为13.考点:1.圆周角定理;2.解直角三角形.18.红【解析】【分析】哪一种颜色多,指针指向那种颜色的可能性就大.【详解】∵转盘分成6个大小相同的扇形,红色的有3块,∴转动一次转盘后,指针指向红颜色的可能性大.故答案为:红.【点睛】解析:红【解析】【分析】哪一种颜色多,指针指向那种颜色的可能性就大.【详解】∵转盘分成6个大小相同的扇形,红色的有3块,∴转动一次转盘后,指针指向红颜色的可能性大.故答案为:红.【点睛】本题考查了可能性大小的知识,解题的关键是看清那种颜色的最多,难度不大.19.【解析】【分析】根据旋转性质及直角三角形斜边中线等于斜边一半,求出CD=CE=5,再根据勾股定理求DE长,的值即为等腰△CDE底角的正弦值,根据等腰三角形三线合一构建直角三角形求解.【详解】【解析】【分析】根据旋转性质及直角三角形斜边中线等于斜边一半,求出CD=CE=5,再根据勾股定理求DE 长,sin DEC∠的值即为等腰△CDE底角的正弦值,根据等腰三角形三线合一构建直角三角形求解.【详解】如图,过D点作DM⊥BC,垂足为M,过C作CN⊥DE,垂足为N,在Rt△ACB中,AC=8,BC=6,由勾股定理得,AB=10,∵D为AB的中点,∴CD=15 2AB= ,由旋转可得,∠MCN=90°,MN=10,∵E为MN的中点,∴CE=15 2MN,∵DM⊥BC,DC=DB,∴CM=BM=13 2BC ,∴EM=CE-CM=5-3=2,∵DM=14 2AC,∴由勾股定理得,DE=25,∵CD=CE=5,CN⊥DE,∴DN=EN=5 ,∴由勾股定理得,CN=25,∴sin∠DEC=25 CNCE.25.【点睛】本题考查旋转性质,直角三角形的性质和等腰三角形的性质,能够用等腰三角形三线合一的性质构建直角三角形解决问题是解答此题的关键.20.【解析】【分析】根据条件可知a与b的数量关系,然后代入原式即可求出答案.【详解】∵=,∴b=a,∴=,故答案为:.【点睛】本题考查了分式,解题的关键是熟练运用分式的运算法则.解析:5 3【解析】【分析】根据条件可知a与b的数量关系,然后代入原式即可求出答案.【详解】∵a b b -=23, ∴b=35a, ∴a b =5335a a =, 故答案为:53. 【点睛】本题考查了分式,解题的关键是熟练运用分式的运算法则. 21.(2,1)【解析】【分析】将二次函数解析式化为顶点式,即可得到顶点坐标.【详解】将二次函数配方得则顶点坐标为(2,1)考点:二次函数的图象和性质.解析:(2,1)【解析】【分析】将二次函数解析式化为顶点式,即可得到顶点坐标.【详解】将二次函数245y x x =-+配方得22()1y x =-+则顶点坐标为(2,1)考点:二次函数的图象和性质. 22.【解析】【分析】直接利用黄金分割的定义求解.【详解】解:∵点C 是线段AB 的黄金分割点且AC >BC ,∴AC=AB .故答案为:.【点睛】本题考查了黄金分割的定义,点C 是线段AB 的黄金分解析:512- 【解析】 【分析】 直接利用黄金分割的定义求解.【详解】解:∵点C 是线段AB 的黄金分割点且AC >BC ,∴AC =51-AB . 故答案为:512-. 【点睛】 本题考查了黄金分割的定义,点C 是线段AB 的黄金分割点且AC >BC ,则51AC BC -=,正确理解黄金分割的定义是解题的关键.23.【解析】【分析】过点作的垂线,则得到两个直角三角形,根据勾股定理和正余弦公式,求的长.【详解】过作于点,设,则,因为,所以,则由勾股定理得,因为,所以,则.则.【点睛】本题考查勾股定解析:2【解析】【分析】过A 点作BC 的垂线,则得到两个直角三角形,根据勾股定理和正余弦公式,求AC 的长.【详解】过A 作AD BC ⊥于D 点,设2AC x =,则2AB x =,因为45C ∠=︒,所以AD CD x ==,则由勾股定理得223BD AB AD x =-=,因为62BC =+,所以362BC x x =+=+,则2x =.则2AC =.【点睛】本题考查勾股定理和正余弦公式的运用,要学会通过作辅助线得到特殊三角形,以便求解.24.>【解析】【分析】根据题意直接利用二次函数的图象与a 的关系即可得出答案.【详解】解:因为二次函数的图像开口方向向上,所以有>0.故填>.【点睛】本题主要考查二次函数的性质,掌握二次解析:>【解析】【分析】根据题意直接利用二次函数的图象与a 的关系即可得出答案.【详解】解:因为二次函数2y ax bx c =++的图像开口方向向上,所以有a >0.故填>.【点睛】本题主要考查二次函数的性质,掌握二次项系数a 与抛物线的关系是解题的关键,图像开口方向向上,a >0;图像开口方向向下,a <0. 25.25%【解析】【分析】设每次降价的百分比为x ,根据前量80,后量45,列出方程,解方程即可得到答案.【详解】设每次降价的百分比为x ,,解得:x1=0.25=25%,x2=1.75(不合解析:25%【解析】【分析】设每次降价的百分比为x ,根据前量80,后量45,列出方程280(1)45x ,解方程即可得到答案.【详解】设每次降价的百分比为x,2x,80(1)45解得:x1=0.25=25%,x2=1.75(不合题意舍去)故答案为:25%.【点睛】此题考查一元二次方程的实际应用,正确理解百分率问题,代入公式:前量(1 x)2=后量,即可解答此类问题.26.4【解析】【分析】先列举出所有上升数,再根据概率公式解答即可.【详解】解:两位数一共有99-10+1=90个,上升数为:共8+7+6+5+4+3+2+1=36个.概率为36÷90=解析:4【解析】【分析】先列举出所有上升数,再根据概率公式解答即可.【详解】解:两位数一共有99-10+1=90个,上升数为:共8+7+6+5+4+3+2+1=36个.概率为36÷90=0.4.故答案为:0.4.27.【解析】【分析】如图,过点D 作DF⊥BC 于F ,由“SAS”可证△ACQ≌△BCP,可得AQ =BP ,∠CAQ=∠CBP,由直角三角形的性质和勾股定理可求BD 的长,由锐角三角函数可求BP 的长,由相解析:677【解析】【分析】如图,过点D 作DF ⊥BC 于F ,由“SAS ”可证△ACQ ≌△BCP ,可得AQ =BP ,∠CAQ =∠CBP ,由直角三角形的性质和勾股定理可求BD 的长,由锐角三角函数可求BP 的长,由相似三角形的性质可求AE 的长,即可求解.【详解】如图,过点D 作DF ⊥BC 于F ,∵△ABC ,△PQC 是等边三角形,∴BC =AC ,PC =CQ ,∠BCA =∠PCQ =60°,∴∠BCP =∠ACQ ,且AC =BC ,CQ =PC , ∴△ACQ ≌△BCP (SAS )∴AQ =BP ,∠CAQ =∠CBP ,∵AC =6,AD =2, ∴CD =4,∵∠ACB =60°,DF ⊥BC ,∴∠CDF =30°,∴CF =12CD =2,DF =CF ÷tan30°3=3 ∴BF =4,∴BD 22DF BF +1612+7,∵△CPQ 是等边三角形,∴S △CPQ =34CP 2, ∴当CP ⊥BD 时,△CPQ 面积最小,∴cos ∠CBD =BP BF BC BD =, ∴627BP =,∴BP =7,∴AQ =BP , ∵∠CAQ =∠CBP ,∠ADE =∠BDC ,∴△ADE ∽△BDC , ∴AE AD BC BD=, ∴6AE =,∴AE =7,∴QE =AQ−AE .. 【点睛】 本题考查了全等三角形的判定和性质,等边三角形的性质,锐角三角函数,相似三角形的判定和性质,直角三角形的性质,勾股定理等知识,求出BP 的长是本题的关键. 28.2【解析】【分析】根据根与系数的关系确定和,然后代入计算即可.【详解】解:∵∴=-3, =-5∴-3-(-5)=2故答案为2.【点睛】本题主要考查了根与系数的关系,牢记对于(a≠解析:2【解析】【分析】根据根与系数的关系确定12x x +和12x x •,然后代入计算即可.【详解】解:∵2350x x +-=∴12x x +=-3, 12x x •=-5∴1212x x x x +-•=-3-(-5)=2故答案为2.【点睛】本题主要考查了根与系数的关系,牢记对于20ax bx c ++=(a≠0),则有:12b x x a +=-,12c x x a•=是解答本题的关键. 29.8【解析】【分析】首先求出A 、B 的坐标,然后根据坐标求出AB 、CD 的长,再根据三角形面积公式计算即可.【详解】解:∵y=x2﹣2x ﹣3,设y =0,∴0=x2﹣2x ﹣3,解得:x1=3,解析:8【解析】【分析】首先求出A 、B 的坐标,然后根据坐标求出AB 、CD 的长,再根据三角形面积公式计算即可.【详解】解:∵y =x 2﹣2x ﹣3,设y =0,∴0=x 2﹣2x ﹣3,解得:x 1=3,x 2=﹣1,即A 点的坐标是(﹣1,0),B 点的坐标是(3,0),∵y =x 2﹣2x ﹣3,=(x ﹣1)2﹣4,∴顶点C 的坐标是(1,﹣4),∴△ABC 的面积=12×4×4=8, 故答案为8.【点睛】本题考查了抛物线与x 轴的交点,二次函数的性质,二次函数的三种形式的应用,主要考查学生运用性质进行计算的能力,题目比较典型,难度适中. 30.∠ACP=∠B(或).【分析】由于△ACP与△ABC有一个公共角,所以可利用两组对应边的比相等且夹角对应相等的两个三角形相似或有两组角对应相等的两个三角形相似进行添加条件.【详解】解析:∠ACP=∠B(或AP ACAC AB=).【解析】【分析】由于△ACP与△ABC有一个公共角,所以可利用两组对应边的比相等且夹角对应相等的两个三角形相似或有两组角对应相等的两个三角形相似进行添加条件.【详解】解:∵∠PAC=∠CAB,∴当∠ACP=∠B时,△ACP∽△ABC;当AP ACAC AB=时,△ACP∽△ABC.故答案为:∠ACP=∠B(或AP ACAC AB=).【点睛】本题考查了相似三角形的判定:两组对应边的比相等且夹角对应相等的两个三角形相似:有两组角对应相等的两个三角形相似.三、解答题31.(1)抛物线与x轴交于点(-1,0)和(3,0);与y轴交于点(0,3);(2)抛物线的对称轴为直线x=1;(3)当x<1时,y随x的增大而增大【解析】【分析】根据表格中数据,可得抛物线与x轴交点坐标,与y轴交点坐标,抛物线的对称轴直线以及抛物线在对称轴左侧的增减性,从而进行解答.【详解】解:由表格数据可知:当x=0时,y=3;当y=0时,x=-1或3∴该函数三条不同的性质为:(1)抛物线与x轴交于点(-1,0)和(3,0);与y轴交于点(0,3);(2)抛物线的对称轴为直线x=1;(3)当x<1时,y随x的增大而增大【点睛】本题考查二次函数性质,数形结合思想解题是本题的解题关键.32.(1)∴x1=2,x2=5;(2)1 2 -【分析】(1)用因式分解法解一元二次方程;(2)先将特殊角三角形函数值代入,然后进行实数的混合运算.【详解】解:(1)27100x x -+=(2)(5)0x x --=∴x 1=2,x 2=5(2)cos60tan 4545︒⨯︒-︒112=⨯ 12=-. 【点睛】本题考查解一元二次方程,特殊角三角函数值的混合运算,掌握运算法则正确计算是解题关键.33.(1)A (-1,0),C (3,0);(2)① E (-13,0);②原函数解析式为:2515522y x x =-++. 【解析】【分析】(1)由二次函数的解析式可求出对称轴为x=1,过点P 作PE ⊥x 轴于点E,所以设A (-m ,0),C (3m ,0),结合对称轴即可求出结果;(2) ①过点P 作PM ⊥x 轴于点M ,连接PE ,DE ,先证明△ABO △EPM 得到AO EM OB PM =,找出OE=a c-,再根据A (-1,0)代入解析式得:3a+c=0,c=-3a ,即可求出OE 的长,则坐标即可找到;②设PM 交BD 于点N ;根据点P (1,c-a ),BN ‖AC ,PM ⊥x 轴表示出PN=-a ,再由tan ∠BPM=25PN BN =求出a ,结合(1)知道c ,即可知道函数解析式. 【详解】(1)∵二次函数为:22y ax ax c =-+(a<0), ∴对称轴为2122b a x a a-=-=-=, 过点P 作PM ⊥x 轴于点M ,则M (1,0),M 为AC 中点,又OA :OC=1:3,设A (-m ,0),C (3m ,0),∴231m m -+=, 解得:m=1, ∴A (-1,0),C (3,0),(2)①做图如下:∵PE ∥AB ,∴∠BAO=∠PEM ,又∠AOB=∠EMP ,∴△ABO△EPM , ∴AO EM OB PM= , 由(1)知:A (-1,0),C (3,0),M (1,0),B (0,c ),P (1,c-a ), ∴11OE c c a +=-, ∴OE=a c-, 将A (-1,0)代入解析式得:3a+c=0,∴c=-3a ,∴133a a OE c a =-== , ∴E (-13,0); ②设PM 交BD 于点N ;∵22y ax ax c =-+(a<0),∴x=1时,y=c-a ,即点P (1,c-a ),∵BN ‖AC ,PM ⊥x 轴∴NM= BO=c ,BN=OM=1,∴PN=-a ,∵tan ∠BPM=25, ∴tan ∠BPM=25BN PN =, ∴PN=52, 即a=-52, 由(1)知c=-3a ,∴c=152; ∴原函数解析式为:2515522y x x =-++. 【点睛】 此题考查了抛物线与x 轴的交点;二次函数的性质,待定系数法求二次函数解析式. 34.(1)y=x 2﹣4x+3;(2)(2,)或(2,7)或(2,﹣1+2)或(2,﹣1﹣2);(3)E 点坐标为(,)时,△CBE 的面积最大. 【解析】试题分析:(1)由直线解析式可求得B 、C 坐标,利用待定系数法可求得抛物线解析式; (2)由抛物线解析式可求得P 点坐标及对称轴,可设出M 点坐标,表示出MC 、MP 和PC 的长,分MC=MP 、MC=PC 和MP=PC 三种情况,可分别得到关于M 点坐标的方程,可求得M 点的坐标;(3)过E 作EF ⊥x 轴,交直线BC 于点F ,交x 轴于点D ,可设出E 点坐标,表示出F 点的坐标,表示出EF的长,进一步可表示出△CBE的面积,利用二次函数的性质可求得其取得最大值时E点的坐标.试题解析:(1)∵直线y=﹣x+3与x轴、y轴分别交于点B、点C,∴B(3,0),C(0,3),把B、C坐标代入抛物线解析式可得,解得,∴抛物线解析式为y=x2﹣4x+3;(2)∵y=x2﹣4x+3=(x﹣2)2﹣1,∴抛物线对称轴为x=2,P(2,﹣1),设M(2,t),且C(0,3),∴MC=,MP=|t+1|,PC=,∵△CPM为等腰三角形,∴有MC=MP、MC=PC和MP=PC三种情况,①当MC=MP时,则有=|t+1|,解得t=,此时M(2,);②当MC=PC时,则有=2,解得t=﹣1(与P点重合,舍去)或t=7,此时M(2,7);③当MP=PC时,则有|t+1|=2,解得t=﹣1+2或t=﹣1﹣2,此时M(2,﹣1+2)或(2,﹣1﹣2);综上可知存在满足条件的点M,其坐标为(2,)或(2,7)或(2,﹣1+2)或(2,﹣1﹣2);(3)如图,过E作EF⊥x轴,交BC于点F,交x轴于点D,设E(x,x2﹣4x+3),则F(x,﹣x+3),∵0<x<3,∴EF=﹣x+3﹣(x2﹣4x+3)=﹣x2+3x,∴S△CBE=S△EFC+S△EFB=EF•OD+EF•BD=EF•OB=×3(﹣x2+3x)=﹣(x﹣)2+,∴当x=时,△CBE的面积最大,此时E点坐标为(,),。

2020年徐汇区西南模范中学初三3月月考卷

2020年徐汇区西南模范中学初三3月月考卷

2020年徐汇区西南模范中学初三3月月考卷the best answer31、What did the teacher ___________ you to __________ at the meeting?A、tell…sayB、ask…speakC、tell…speakD、ask…talk32、 I remember ___________ a telephone call to Miss Li last night、A、 makeB、 to makeC、 makingD、 made33、 Our teacher, together with all the students,__________ morning exercise every day、A、 doB、 doesC、 is doingD、 are doing34、 The workers in the city ____________ for more than sixteen hours a day in old days、A、 are made to workB、 are made workC、 were made to workD、 were made work35、 This winter was not too cold、 The ice in the river was too thin for us _____________、A、 to skate on itB、 skating on itC、 to skate onD、 skating on36、 The number of students who ___________ the English club _____________20、A、 take part in, isB、 join, areC、 take part in, areD、 join, is37、 Mike studies ___________ Mary、A、 not so hardly asB、 as hardly asC、 as hard asD、 not as hard as38、 They go to see their grandparents ____________ Sunday morning、A、 in everyB、 everyC、 on everyD、 in39、We had no ___________ in finding the doctor’s address、A、 problemB、 troubleC、 questionD、 matter40、 Yesterday I met Miss Li in the street、 She told me that she ____________ to Japan twice、A、 has beenB、 wentC、 had beenD、 has gone41、Last Teachers’ Day, the teachers received a box ____________ card、A、 was filled withB、 full ofC、 fill withD、 fulled with42、 He will take part in the beginning ceremony when the new hospital ___________ to the public、A、 is openB、 is openedC、 will openD、 will be opened43、– Do you mind my taking this seat?______________、A、 Yes, sit down, please、B、 Yes, take it, please、C、 No, of course not、D、No, you can’t take it、44、 He left the meeting early because he had to__________ his son from school、A、 pick upB、 put upC、 take upD、 bring up45、 Mr、Black didn’t go to work yesterday because he was ill in __________ bed、A、 aB、 anC、 theD、 /46、 She has made many friends ___________ she came to our school、A、 beforeB、 afterC、 sinceD、 until47、 I am ___________ your view on spending pocket money、It’s reasonable、A、 in favour ofB、 in charge ofC、 afraid ofD、 famous for48、 The girl needs some help, _____________?A、 does sheB、 need sheC、doesn’t sheD、needn’t she49、 The characters need strong personalities____________ will come across in the picture、A、 whoB、 whichC、 whenD、 where50、 Steam ___________ from the basin after heating the water、A、 was seen riseB、 was seen to raiseC、 was seen raisingD、 was seen rising II、 Complete the following passage with words or phrases in the box、 Each word can only be used once、A、 during the last few hoursB、 a great helpC、 in spaceD、 older onesE、 earlier onesF、 how the weather will changeG、 take picturesH、 be able toI、 forms Now satellites are helping to forecast (预报)the weather、 They are ______51_______, and they can reach any part of the world、 The satellites______52______ of the atmosphere (大气), because this is where the weather ______53_______、 They send these pictures to the weather stations、 So meteorologists (气象学家)can see the weather of any part of the world、 From the pictures, the scientists can often say_______54______、 Today, nearly five hundred weather stations in sixty countries receive satellite pictures、When they receive new pictures, the meteorologists compare them with ______55______、 Perhaps they may find that the clouds have changed ______56______、 This may mean that the weather on the ground may soon change, too、 In their next weather forecast, the meteorologists can say this、 So the weather satellites are_____57______ to the meteorologists、 Before satellites were invented, the scientists could forecast the weather for about24 or48 hours、 Now they can make good forecasts for three or five days、 Soon, perhaps, they may______58______ forecast the weather for a week or moreahead (提前)、III、 Complete the sentences with the given words in their proper forms、59、It’s amazing to see the _____________ areas in France、 (scene)60、Do you know the _____________ “Practice makes perfect”? (say)61、He’s old-fashioned and never ___________ his style、 (vary)62、 Tom and Tim are twins, but they have different _______________、 (person)63、 He was one of the ____________ artists of his time、 (lead)64、 We can use sound effects of add ____________、(exciting)65、 For _____________, some comic strips have no frame borders、 (vary)66、 The young man was lucky enough to be still____________ after the accident、 (living)IV、 Rewrite the sentences as required67、If she doesn’t come on time, we’ll go without her、 (保持原意)We’ll go without her _____________ she _____________ on time、68、 The boy was too frightened to say a word、 (保持原意)The boy was __________ frightened that he __________ say a word、69、 The coat cost Mary nearly a month salary,___________ ___________? (反义疑问句)70、He was so fat that he couldn’t get through the door、 (保持原意)He was not _________ ___________ to get through the door、71、Did the policemen catch the robber? (改被动语态)____________ the robber ____________ by the policemen?72、 Noise pollution makes people talk more loudlythan before、 (保持原意)People have __________ talk more loudly than before___________ of noise pollution、73、“Has Bob been to London?” Tom asked、 (改为宾语从句)Tom asked ___________ Bob ___________ been toLondon、C、 Read the passage and fill in the blanks with proper words、 Do you love holidays, but hate the increase in weight that follows? You are not alone、Holidays are happy days with p_____86______ and delicious foods、 But many people are worried about the weight that comes with these delicious foods、 With proper planning, it is possible to c______87_____ your weight、 The ideais to enjoy the holidays but not to eat too much、 You don’t have to turn away from the foods that you enjoy、The following advice may be of some help to you、 Do not m______88_____ meals、 Before you leave home for a party, have a small, low-fat meal or fast food、 This may help to keep you from getting too excited before the wonderful foods、 Begin with clear soup and fruit or vegetables、 A large glass of water before you eat may help you feel full、 Use a small plate; a large plate may make you eat m______89______ than enough、 Better not have high-fat foods、 Choose lean(瘦的)meats、 Fill your plate with salad and green vegetables、 Try mints (薄荷)and fruits i______90____ you have a sweet tooth、They do not have fat l_____91_____ cream and chocolate、Don’t let exercise take a b______92______ during th e holidays、 A20-minute walk after a meal can help you burn off excess calories、 (多余的热量)D、 Answer the questions (根据短文内容回答下列问题)No matter what happens, I ll always be there for youIn1989 an8、2 earthquake almost flattened America, killing over30,000 people in less than four minutes、 In the midst of utter devastation and chaos, a father left his wife safely at home and rushed to the school where his son was supposed to be, only to discover that thebuilding was as flat as a pancake、 After the unforgettably initial shock, he remembered the promise he had made to his son: "No matter what, Ill always be there for you!" And tears began to fill his eyes、 As he looked at the pile of ruins that once was the school, it looked hopeless, but he kept remembering his commitment to his son、He began to direct his attention towards where he walked his son to class at school each morning、Remembering his sons classroom would be in the back right corner of the building, he rushed there and started digging through the ruins、As he was digging, otherhelpless parents arrived, clutching their hearts, saying: "My son!" "My daughter!" Other well-meaning parents tried to pull him off what was left of the school, saying: "Its too late! Theyre all dead! You cant help! Go home! Come on, face reality, theres nothing you can do!" To each parent he responded with one line: "Are you going to help me now?" And then he continued to dig for his son, stone by stone、 The fire chief showed up and tried to pull him off the schools ruins saying, "Fires are breaking out, explosions are happening everywhere、 Youre in danger、Well take care of it、 Go home、" To which this loving, caring American father asked, "Are you going to help me now?" The police came and said, "Youre angry, anxious and its over、 Youre endangering others、 Go home、 Well handle it!" To which he replied, "Are you going to help me now?" No one helped、Courageously he went on alone because he needed to know for himself: "Is my boy alive or is he dead?" He dug for eight hours、、、12 hours、、、24 hours、、、36 hours、、、then, in the38th hour, he pulled back a large stone and heard his sons voice、 He screamed his sons name, "ARMAND!" He heard back, "Dad!?! Its me, Dad! I told the other kids not toworry、 I told them that if you were alive, youd save me and when you saved me, theyd be saved、 You promised, No matter what happens, youll always be there for you! You did it, Dad!" "Whats going on in there? How is it?" the father asked、"There are14 of us left out of33, Dad、Were scared, hungry, thirsty and thankful youre here、When the building collapsed, it made a triangle, and it saved us、""Come out, boy!""No, Dad! Let the other kids out first, cause I know youll get me! No matter what happens, I know youll always be there for me!"93、 No one knew what would happen,didthey ?_______________________________________________94、 How many people lost their lives in the Earthquake in less than fourminutes?________________________________________________95、 Why was the father so insistent that he kept looking for hisson ?_______________________________________________96、 All of the parents were looking for their children,weren’tthey ?_________________________________________________97、 What do you think of thestory ?__________________________________________________98、 How do you feel about thestory ?_________________________________________________首字母附加篇The world p_______is growing very fast、 In thelast40 years ,it has doubled 、 By the year2200, it will be about10 billion、 Our cities will be much bigger、There will be more factories and more roads、 We will need more water and other natural r_______、 Therefore, we will have serious problems in the future, so we must change the way we use e_______and natural resources now、Every day we throw away millions of tons of rubbish、Half of this is paper that we can use again、 Ana_______family in Europe or America throws away more than one ton of rubbish each year, but we can r______much of it、 If we recycle things, we can save money,energy and resources、 A lot of rubbish, however,cannot be recycled、 P________and chemicals will not disappear for hundreds of years、 They pollute the air, the land and the water、 Pollution will be an even bigger problem in the future、 Therefore, we must stop using m_______likeplastics and chemicals、 Many natural resources cannot be r_______、 Coal and minerals, for example, will be used up some day、 Other resources take a long time to grow, such as trees, or they may not always be a______, such as water、 We must learn to use less energy and fewer resources、 We also have to find other w_______to make energy 、 We can find ways to use the sun, the wind and the sea、KeysI、 A C B C C D C B B C B B C A D C A C B D II、 C G I F E A B H III、 scenic saying varies personalities leading excitement variety alive IV、unless comes so couldn’t didn’t it thin enough was caught to because if had C篇pleasant control miss more if like break D篇93、No,they didn’t94、 Over30000 people95、 Because he made the promise to his son that no matter what ,he would always be there for him、96、No ,they weren’t97、it’s moving98、 He is a brave boy附加篇:Population resources energy average reduce Plastics materials renewable available ways。

2017年上海徐汇区初三一模数学试卷答案

2017年上海徐汇区初三一模数学试卷答案

=
3+2
=
5 ,不正确.
h y
2
2
i.iz .∵ , D
2x = 3y
osh ∴ x
2
=
jia y
3
∴ x = 3 = 3 ,不正确.
x+y
3+2
5
故选B.
2. 如果一斜坡的坡比是1 : 2.4,那么该斜坡坡角的余弦值是( ).
A. 12
5
B. 5
12
C. 5
13
答案 D
解析
如图所示:
由题意,得:tan α = i =

答 案 √3 : 2
解 析 ∵两个相似三角形的对应中线比是√3 : 2, ∴它们的周长比为√3 : 2.
2018/12/04 11. 如果点P 是线段AB的黄金分割点(AP > BP ),那么请你写出一个关于线段AP 、BP 、AB之间的数量关系的等式,你的
结论是:

答案 解析
AP 2 = BP ⋅ AB
2
2
∴ , 1
1
⋅ AP ⋅ BE = ⋅ DF ⋅ AQ
2
2
−−
∴ . AP
2√3
2√39
AQ
=
−− √13
=
13
−−
故答案为 2√39 .
13
解答题:(本大题共7题,第19-22题每题10分,第23、24题每题12分,第25题14分,满分78分)
19. 计算: ∘


2sin 60 − |cot30 − cot45 | +
3
B.
x =3
x−y
答案 B

2017年徐汇区西南模范中学初三3月月考卷

2017年徐汇区西南模范中学初三3月月考卷

2017年3月西南模范初三测试卷I. Choose the best answer31. What did the teacher ___________ you to __________ at the meeting?A. tell…sayB. ask…speakC. tell…speakD. ask…talk32. I remember ___________ a telephone call to Miss Li last night.A. makeB. to makeC. makingD. made33. Our teacher, together with all the students, __________ morning exercise every day.A. doB. doesC. is doingD. are doing34. The workers in the city ____________ for more than sixteen hours a day in old days.A. are made to workB. are made workC. were made to workD. were made work35. This winter was not too cold. The ice in the river was too thin for us _____________.A. to skate on itB. skating on itC. to skate onD. skating on36. The number of students who ___________ the English club _____________20.A. take part in, isB. join, areC. take part in, areD. join, is37. Mike studies ___________ Mary.A. not so hardly asB. as hardly asC. as hard asD. not as hard as38. They go to see their grandparents ____________ Sunday morning.A. in everyB. everyC. on everyD. in39. We had no ___________ in finding the doctor’s address.A. problemB. troubleC. questionD. matter40. Yesterday I met Miss Li in the street. She told me that she ____________ to Japan twice.A. has beenB. wentC. had beenD. has gone41. Last Teachers’ Day, the teachers received a box ____________ card.A. was filled withB. full ofC. fill withD. fulled with42. He will take part in the beginning ceremony when the new hospital ___________ to the public.A. is openB. is openedC. will openD. will be opened43. – Do you mind my taking this seat?-- ______________.A. Yes, sit down, please.B. Yes, take it, please.C. No, of course not.D. No, you can’t take it.44. He left the meeting early because he had to __________ his son from school.A. pick upB. put upC. take upD. bring up45. Mr. Black didn’t go to work yesterday because he was ill in __________ bed.A. aB. anC. theD. /46. She has made many friends ___________ she came to our school.A. beforeB. afterC. sinceD. until47. I am ___________ your view on spending pocket money. It’s reasonable.A. in favour ofB. in charge ofC. afraid ofD. famous for48. The girl needs some help, _____________?A. does sheB. need sheC. doesn’t sheD. needn’t she49. The characters need strong personalities ____________ will come across in the picture.A. whoB. whichC. whenD. where50. Steam ___________ from the basin after heating the water.A. was seen riseB. was seen to raiseC. was seen raisingD. was seen risingII. Complete the following passage with words or phrases in the box. Each word can only be usedNow satellites are helping to forecast (预报) the weather. They are ______51_______, and they can reach any part of the world. The satellites ______52______ of the atmosphere (大气), because this is where the weather ______53_______. They send these pictures to the weather stations. So meteorologists (气象学家) can see the weather of any part of the world. From the pictures, the scientists can often say _______54______.Today, nearly five hundred weather stations in sixty countries receive satellite pictures. When they receive new pictures, the meteorologists compare them with ______55______. Perhaps they may find that the clouds have changed ______56______. This may mean that the weather on the ground may soon change, too. In their next weather forecast, the meteorologists can say this.So the weather satellites are _____57______ to the meteorologists. Before satellites were invented, the scientists could forecast the weather for about 24 or 48 hours. Now they can make good forecasts for three or five days. Soon, perhaps, they may ______58______ forecast the weather for a week or more ahead (提前).III. Complete the sentences with the given words in their proper forms.59. It’s amazing to see the _____________ areas in France. (scene)60. Do you know the _____________ “Practice makes perfect”? (say)61. He’s old-fashioned and never ___________ his style. (vary)62. Tom and Tim are twins, but they have different _______________. (person)63. He was one of the ____________ artists of his time. (lead)64. We can use sound effects of add ____________. (exciting)65. For _____________, some comic strips have no frame borders. (vary)66. The young man was lucky enough to be still ____________ after the accident. (living)IV. Rewrite the sentences as required67. If she doesn’t come on time, we’ll go without her. (保持原意)We’ll go without her _____________ she _____________ on time.68. The boy was too frightened to say a word. (保持原意)The boy was __________ frightened that he __________ say a word.69. The coat cost Mary nearly a month salary, ___________ ___________? (反义疑问句)70. He was so fat that he couldn’t get through the door. (保持原意)He was not _________ ___________ to get through the door.71. Did the policemen catch the robber? (改被动语态)____________ the robber ____________ by the policemen?72. Noise pollution makes people talk more loudly than before. (保持原意)People have __________ talk more loudly than before ___________ of noise pollution.73. “Has Bob been to London?” Tom asked. (改为宾语从句)Tom asked ___________ Bob ___________ been to London.C. Read the passage and fill in the blanks with proper words.Do you love holidays, but hate the increase in weight that follows? You are not alone. Holidays are happy days with p_____86______ and delicious foods. But many people are worried about the weight that comes with these delicious foods.With proper planning, it is possible to c______87_____ your weight. The idea is to enjoy the holidays but not to eat too much. You don’t have to turn away from the foods that you enjoy. The following advice may be of some help to you.Do not m______88_____ meals. Before you leave home for a party, have a small, low-fat meal or fast food. This may help to keep you from getting too excited before the wonderful foods.Begin with clear soup and fruit or vegetables. A large glass of water before you eat may help you feel full. Use a small plate; a large plate may make you eat m______89______ than enough. Better not have high-fat foods. Choose lean(瘦的) meats. Fill your plate with salad and green vegetables.Try mints (薄荷) and fruits i______90____ you have a sweet tooth. They do not have fat l_____91_____ cream and chocolate.Don’t let exercise take a b______92______ during the holidays. A 20-minute walk after a meal can help you burn off excess calories. (多余的热量)D. Answer the questions (根据短文内容回答下列问题)No matter what happens, I 'll always be there for youIn 1989 an 8.2 earthquake almost flattened America, killing over 30,000 people in less than four minutes. In the midst of utter devastation and chaos, a father left his wife safely at home and rushed to the school where his son was supposed to be, only to discover that the building was as flat as a pancake.After the unforgettably initial shock, he remembered the promise he had made to his son: "No matter what, I'll always be there for you!" And tears began to fill his eyes. As he looked at the pile of ruins that once was the school, it looked hopeless, but he kept remembering his commitment to his son.He began to direct his attention towards where he walked his son to class at school each morning. Remembering his son's classroom would be in the back right corner of the building, he rushed there and started digging through the ruins.As he was digging, other helpless parents arrived, clutching their hearts, saying: "My son!" "My daughter!" Other well-meaning parents tried to pull him off what was left of the school, saying: "It's too late! They're all dead! You can't help! Go home! Come on, face reality, there's nothing you can do!"To each parent he responded with one line: "Are you going to help me now?" And then hecontinued to dig for his son, stone by stone. The fire chief showed up and tried to pull him off the school's ruins saying, "Fires are breaking out, explosions are happening everywhere. You're in danger. We'll take care of it. Go home." To which this loving, caring American father asked, "Are you going to help me now?"The police came and said, "You're angry, anxious and it's over. You're endangering others. Go home. We'll handle it!" To which he replied, "Are you going to help me now?" No one helped. Courageously he went on alone because he needed to know for himself: "Is my boy alive or is he dead?" He dug for eight hours...12 hours...24 hours...36 hours...then, in the 38th hour, he pulled back a large stone and heard his son's voice. He screamed his son's name, "ARMAND!" He heard back, "Dad!?! It's me, Dad! I told the other kids not to worry. I told them that if you were alive, you'd save me and when you saved me, they'd be saved. You promised, No matter what happens, you'll always be there for you! You did it, Dad!" "What's going on in there? How is it?" the father asked."There are 14 of us left out of 33, Dad. We're scared, hungry, thirsty and thankful you're here. When the building collapsed, it made a triangle, and it saved us.""Come out, boy!""No, Dad! Let the other kids out first, cause I know you'll get me! No matter what happens, I know you'll always be there for me!"93.No one knew what would happen,did they ?_______________________________________________94.How many people lost their lives in the Earthquake in less than four minutes?________________________________________________95.Why was the father so insistent that he kept looking for his son ?_______________________________________________96.All of the parents were looking for their children,weren’t they ?_________________________________________________97.What do you think of the story ?__________________________________________________98.How do you feel about the story ?_________________________________________________首字母附加篇The world p_______is growing very fast. In the last 40 years ,it has doubled . By the year 2200, it will be about 10 billion. Our cities will be much bigger. There will be more factories and more roads. We will need more water and other natural r_______. Therefore, we will have serious problems in the future, so we must change the way we use e_______and natural resources now.Every day we throw away millions of tons of rubbish. Half of this is paper that we can use again. An a_______family in Europe or America throws away more than one ton of rubbish each year, but we can r______much of it. If we recycle things, we can save money,energy and resources. A lot of rubbish, however,cannot be recycled. P________and chemicals will not disappear for hundreds of years. They pollute the air, the land and the water. Pollution will be an even bigger problem in the future. Therefore, we must stop using m_______like plastics and chemicals. Many natural resources cannot be r_______. Coal and minerals, for example, will be used up some day. Other resources take a long time to grow, such as trees, or they may not always be a______, such as water. We must learn to use less energy and fewer resources. We also have to find other w_______to make energy . We can find ways to use the sun, the wind and the sea.KeysI. A C B C C D C B B C B B C A D C A C B DII. C G I F E A B HIII. scenic saying varies personalities leading excitement variety aliveIV. unless comes so couldn’t didn’t it thin enough was caught to because if hadC篇pleasant control miss more if like breakD篇93.No,they didn’t94.Over 30000 people95.Because he made the promise to his son that no matter what ,he would always be there for him.96.No ,they weren’t97.it’s moving98.He is a brave boy附加篇:Population resources energy average reducePlastics materials renewable available ways。

上海西南模范中学中考化学模拟试题_图文

上海西南模范中学中考化学模拟试题_图文

上海西南模范中学中考化学模拟试题_图文一、选择题1.下列四个图像反映了对应实验过程中相关量的变化,其中错误的是A.部分变质的NaOH溶液中滴加稀盐酸B.HCl气体的溶解度受温度影响的变化曲线C.等质量的Mg粉和Fe粉A.A B.B C.C D.D2.下列各组物质的溶液,不用其他试剂没,仅通过观察和用组内溶液相互混合的方法,不能将其逐一鉴别出来的是()A.NaOH Ca(OH)2HCl Na2CO3B.KCl Ba(NO3)2CuSO4NaOHC.AgNO3HCl Na2CO3CaCl2D.Ba(OH)2KCl Na2SO4Na2CO33.相同质量的M、N两种金属,分别与相同质量分数的足量稀盐酸反应(M、N在生成物中均为+2价),生成H2质量和反应时间的关系如图所示.下列有关叙述正确的是A.金属活动性:N>M B.生成H2的质量相等C.相对原子质量:N>M D.消耗盐酸的质量相等4.t℃时,Na2CO3溶解度为Ag,现有饱和Na2CO3溶液(100+A)g,溶质质量分数为a%,向该溶液中投入无水碳酸钠Ag,静置后析出碳酸钠晶体(Na2CO3·10H2O)Bg,加水使晶体全部溶解,所得溶液质量分数为a%,则加入水的质量为( )A.(100+A)g B.100gC.100180286Ag D.(10 -A·a%)g5.正确规范的操作是实验成功和人身安全的重要保证。

下列实验操作正确的是()A.测定溶液pH B.配制溶液C.称量固体D.稀释浓硫酸6.下表物质中含有少量杂质,其中除杂方法正确的是物质杂质除去杂质的方法A CaCl2溶液HCl滴入碳酸钠溶液B CO2O2通过灼热的铜网C NaOH Na2CO3加入稀盐酸至不再产生气泡D CuO Cu加足量稀盐酸,充分搅拌后再过滤A.A B.B C.C D.D7.在硝酸银、硝酸铜的混合溶液中加入一定量锌粉,反应停止后过滤,滤液仍为蓝色,有关判断正确的是()A.滤渣中一定有银、没有铜和锌B.滤渣中一定有银和锌,可能有铜C.滤液中一定有硝酸锌、硝酸铜、硝酸银D.滤液中一定有硝酸锌、硝酸铜,可能有硝酸银8.(2012年山东烟台,18题,2分)电影《黄金大劫案》上映后,里面用“王水”(浓盐酸与浓硝酸的混合液)溶解黄金的情引起了广泛的热议。

上海西南模范中学中考物理模拟试题_图文

上海西南模范中学中考物理模拟试题_图文

上海西南模范中学中考物理模拟试题_图文一、选择题1.如图所示,甲、乙两个圆柱形容器中分别装有深度相同、密度不同的液体,静止在水平桌面上。

甲容器的底面积为S1,乙容器的底面积为S2;甲容器中液体的密度为ρ1,液体对容器底产生的压力为F1、压强为p1;乙容器中液体的密度为ρ2,液体对容器底压力为F2、压强为p2。

已知3S1=5S2,2ρ1=ρ2。

则下列叙述中正确的是()A.F1>F2,p1<p2B.F1= F2,p1<p2C.F1<F2,p1<p2D.F1<F2,p1>p2 2.某大学两位研究生从蚂蚁身上得到启示,设计出如图所示的“都市蚂蚁”概念车.这款概念车小巧实用,有利于缓解城市交通拥堵.下列关于正在城市中心马路上行驶的此车说法正确的是()A.以路面为参照物,车是静止的B.以路旁的树木为参照物,车是静止的C.以路旁的房屋为参照物,车是运动的D.以车内的驾驶员为参照物,车是运动的3.地磁场被称为地球生命的“保护伞”。

如图从太阳向其他星体发射出来的高速带电粒子流,在接近地球时,地磁场会改变其运动方向,使其偏离地球,对地球起到了保护作用,以下各图与其原理相同的是()A.B.C.D.4.小明同学到南美洲游学,见到一种外表酷似微型西瓜的野生水果,其独特的迷你造型和清爽的口感令人称奇.图是迷你“西瓜”与一元硬币放在起的对比照,根据图片信息,估测该迷你“西瓜”的长度约A.2mm B.2cm C.6mm D.6cm5.家庭常用的电吹风既能吹冷风又能吹热风.下列电路中最符合电吹风工作要求的是()A.B.C.D.6.古代有很多励志故事激励着我们奋发向上,为中华民族的伟大复兴而努力。

关于这些故事中包含的物理道理,下列说法不正确的是()A.祖逖“闻鸡起舞”,鸡的鸣叫声催人起床说明声音可以传递信息B.项羽“破釜沉舟”,船在下沉过程中所受浮力大于重力C.勾践“卧薪尝胆”,躺在柴薪上通过减小受力面积的方法增大了压强D.匡衡“凿壁偷光”,隔壁的灯光照在书本上发生了漫反射7.在图所示的电路中,电源电压保持不变,现将一个电压表V接入电路的AB或CD两点间.电键 S闭合后,在向左移动滑动变阻器R2滑片P的过程中,下列数值一定不变的是A.电压表 V 的示数B.电流表 A 的示数C.电压表 V 示数与电流表A示数的比值D.电压表 V 示数变化量与电流表 A 示数变化量的比值8.如图是国内首个不用人为控制且能送货到家的无人快递车。

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2017年3月西南模范初三测试卷I. Choose the best answer31. What did the teacher ___________ you to __________ at the meeting?A. tell…sayB. ask…speakC. tell…speakD. ask…talk32. I remember ___________ a telephone call to Miss Li last night.A. makeB. to makeC. makingD. made33. Our teacher, together with all the students, __________ morning exercise every day.A. doB. doesC. is doingD. are doing34. The workers in the city ____________ for more than sixteen hours a day in old days.A. are made to workB. are made workC. were made to workD. were made work35. This winter was not too cold. The ice in the river was too thin for us _____________.A. to skate on itB. skating on itC. to skate onD. skating on36. The number of students who ___________ the English club _____________20.A. take part in, isB. join, areC. take part in, areD. join, is37. Mike studies ___________ Mary.A. not so hardly asB. as hardly asC. as hard asD. not as hard as38. They go to see their grandparents ____________ Sunday morning.A. in everyB. everyC. on everyD. in39. We had no ___________ in finding the doctor’s address.A. problemB. troubleC. questionD. matter40. Yesterday I met Miss Li in the street. She told me that she ____________ to Japan twice.A. has beenB. wentC. had beenD. has gone41. Last Teachers’ Day, the teachers received a box ____________ card.A. was filled withB. full ofC. fill withD. fulled with42. He will take part in the beginning ceremony when the new hospital ___________ to the public.A. is openB. is openedC. will openD. will be opened43. – Do you mind my taking this seat?-- ______________.A. Yes, sit down, please.B. Yes, take it, please.C. No, of course not.D. No, you can’t take it.44. He left the meeting early because he had to __________ his son from school.A. pick upB. put upC. take upD. bring up45. Mr. Black didn’t go to work yesterday because he was ill in __________ bed.A. aB. anC. theD. /46. She has made many friends ___________ she came to our school.A. beforeB. afterC. sinceD. until47. I am ___________ your view on spending pocket money. It’s reasonable.A. in favour ofB. in charge ofC. afraid ofD. famous for48. The girl needs some help, _____________?A. does sheB. need sheC. doesn’t sheD. needn’t she49. The characters need strong personalities ____________ will come across in the picture.A. whoB. whichC. whenD. where50. Steam ___________ from the basin after heating the water.A. was seen riseB. was seen to raiseC. was seen raisingD. was seen risingII. Complete the following passage with words or phrases in the box. Each word can only be usedNow satellites are helping to forecast (预报) the weather. They are ______51_______, and they can reach any part of the world. The satellites ______52______ of the atmosphere (大气), because this is where the weather ______53_______. They send these pictures to the weather stations. So meteorologists (气象学家) can see the weather of any part of the world. From the pictures, the scientists can often say _______54______.Today, nearly five hundred weather stations in sixty countries receive satellite pictures. When they receive new pictures, the meteorologists compare them with ______55______. Perhaps they may find that the clouds have changed ______56______. This may mean that the weather on the ground may soon change, too. In their next weather forecast, the meteorologists can say this.So the weather satellites are _____57______ to the meteorologists. Before satellites were invented, the scientists could forecast the weather for about 24 or 48 hours. Now they can make good forecasts for three or five days. Soon, perhaps, they may ______58______ forecast the weather for a week or more ahead (提前).III. Complete the sentences with the given words in their proper forms.59. It’s amazing to see the _____________ areas in France. (scene)60. Do you know the _____________ “Practice makes perfect”? (say)61. He’s old-fashioned and never ___________ his style. (vary)62. Tom and Tim are twins, but they have different _______________. (person)63. He was one of the ____________ artists of his time. (lead)64. We can use sound effects of add ____________. (exciting)65. For _____________, some comic strips have no frame borders. (vary)66. The young man was lucky enough to be still ____________ after the accident. (living)IV. Rewrite the sentences as required67. If she doesn’t come on time, we’ll go without her. (保持原意)We’ll go without her _____________ she _____________ on time.68. The boy was too frightened to say a word. (保持原意)The boy was __________ frightened that he __________ say a word.69. The coat cost Mary nearly a month salary, ___________ ___________? (反义疑问句)70. He was so fat that he couldn’t get through the door. (保持原意)He was not _________ ___________ to get through the door.71. Did the policemen catch the robber? (改被动语态)____________ the robber ____________ by the policemen?72. Noise pollution makes people talk more loudly than before. (保持原意)People have __________ talk more loudly than before ___________ of noise pollution.73. “Has Bob been to London?” Tom asked. (改为宾语从句)Tom asked ___________ Bob ___________ been to London.C. Read the passage and fill in the blanks with proper words.Do you love holidays, but hate the increase in weight that follows? You are not alone. Holidays are happy days with p_____86______ and delicious foods. But many people are worried about the weight that comes with these delicious foods.With proper planning, it is possible to c______87_____ your weight. The idea is to enjoy the holidays but not to eat too much. You don’t have to turn away from the foods that you enjoy. The following advice may be of some help to you.Do not m______88_____ meals. Before you leave home for a party, have a small, low-fat meal or fast food. This may help to keep you from getting too excited before the wonderful foods. Begin with clear soup and fruit or vegetables. A large glass of water before you eat may help you feel full. Use a small plate; a large plate may make you eat m______89______ than enough. Better not have high-fat foods. Choose lean(瘦的) meats. Fill your plate with salad and green vegetables.Try mints (薄荷) and fruits i______90____ you have a sweet tooth. They do not have fat l_____91_____ cream and chocolate.Don’t let exercise take a b______92______ during the holidays. A 20-minute walk after a meal can help you burn off excess calories. (多余的热量)D. Answer the questions (根据短文内容回答下列问题)No matter what happens, I 'll always be there for youIn 1989 an 8.2 earthquake almost flattened America, killing over 30,000 people in less than four minutes. In the midst of utter devastation and chaos, a father left his wife safely at home and rushed to the school where his son was supposed to be, only to discover that the building was as flat as a pancake.After the unforgettably initial shock, he remembered the promise he had made to his son: "No matter what, I'll always be there for you!" And tears began to fill his eyes. As he looked at the pile of ruins that once was the school, it looked hopeless, but he kept remembering his commitment to his son.He began to direct his attention towards where he walked his son to class at school each morning. Remembering his son's classroom would be in the back right corner of the building, he rushed there and started digging through the ruins.As he was digging, other helpless parents arrived, clutching their hearts, saying: "My son!""My daughter!" Other well-meaning parents tried to pull him off what was left of the school, saying: "It's too late! They're all dead! You can't help! Go home! Come on, face reality, there's nothing you can do!"To each parent he responded with one line: "Are you going to help me now?" And then he continued to dig for his son, stone by stone. The fire chief showed up and tried to pull him off the school's ruins saying, "Fires are breaking out, explosions are happening everywhere. You're in danger. We'll take care of it. Go home." To which this loving, caring American father asked, "Are you going to help me now?"The police came and said, "You're angry, anxious and it's over. You're endangering others. Go home. We'll handle it!" To which he replied, "Are you going to help me now?" No one helped. Courageously he went on alone because he needed to know for himself: "Is my boy alive or is he dead?" He dug for eight hours...12 hours...24 hours...36 hours...then, in the 38th hour, he pulled back a large stone and heard his son's voice. He screamed his son's name, "ARMAND!" He heard back, "Dad!?! It's me, Dad! I told the other kids not to worry. I told them that if you were alive, you'd save me and when you saved me, they'd be saved. You promised, No matter what happens, you'll always be there for you! You did it, Dad!""What's going on in there? How is it?" the father asked."There are 14 of us left out of 33, Dad. We're scared, hungry, thirsty and thankful you're here. When the building collapsed, it made a triangle, and it saved us.""Come out, boy!""No, Dad! Let the other kids out first, cause I know you'll get me! No matter what happens, I know you'll always be there for me!"93.No one knew what would happen,did they ?_______________________________________________94.How many people lost their lives in the Earthquake in less than four minutes?________________________________________________95.Why was the father so insistent that he kept looking for his son ?_______________________________________________96.All of the parents were looking for their children,weren’t they ?_________________________________________________97.What do you think of the story ?__________________________________________________98.How do you feel about the story ?_________________________________________________首字母附加篇The world p_______is growing very fast. In the last 40 years ,it has doubled . By the year 2200, it will be about 10 billion. Our cities will be much bigger. There will be more factories and more roads. We will need more water and other natural r_______. Therefore, we will have serious problems in the future, so we must change the way we use e_______and natural resources now.Every day we throw away millions of tons of rubbish. Half of this is paper that we can use again. An a_______family in Europe or America throws away more than one ton of rubbish each year, but we can r______much of it. If we recycle things, we can save money,energy and resources.A lot of rubbish, however,cannot be recycled. P________and chemicals will not disappear for hundreds of years. They pollute the air, the land and the water. Pollution will be an even bigger problem in the future. Therefore, we must stop using m_______like plastics and chemicals. Many natural resources cannot be r_______. Coal and minerals, for example, will be used up some day. Other resources take a long time to grow, such as trees, or they may not always be a______, such as water. We must learn to use less energy and fewer resources. We also have to find other w_______to make energy . We can find ways to use the sun, the wind and the sea.KeysI. A C B C C D C B B C B B C A D C A C B DII. C G I F E A B HIII. scenic saying varies personalities leading excitement variety aliveIV. unless comes so couldn’t didn’t it thin enough was caught to because if hadC篇pleasant control miss more if like breakD篇93.No,they didn’t94.Over 30000 people95.Because he made the promise to his son that no matter what ,he would always be there for him.96.No ,they weren’t97.it’s moving98.He is a brave boy附加篇:Population resources energy average reducePlastics materials renewable available ways。

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