江苏省无锡市安镇中学2017-2018学年九年级初三一模

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【3套试题】无锡市中考第一次模拟考试物理试题含答案

【3套试题】无锡市中考第一次模拟考试物理试题含答案

2018学年第二学期期中检测题九年级物理(问卷)第一部分(共36分)一、选择题(每题3分,共36分)1.如图1所示是声波的波形图,下列说法正确的是 ( )A.甲、乙的响度相同 B.甲、丙的音调相同C.乙、丁的音色相同 D.丙、丁的响度相同2.下列现象的解释错误的是( )A.水难压缩是由于分子间存在斥力B.把煤磨成煤粉燃烧能提高燃料利用率是由于其热值变大C.家用“暖气”用水作介质是利用水的比热容大D.糖放入热水中很快变甜是由于温度越高,分子运动越剧烈3.如图2,在同样的水平面上,两人分别去推静止在水平面上重100N的同一课桌。

小芳用10N的水平推力,课桌最终沿水平面以2m/s做匀速直线运动;小明用20N的水平推力,课桌在水平面上也做直线运动。

则下列说法正确的是()A.小芳推课桌时,课桌受到的摩擦力大小为100NB.小芳推课桌时,推力做功的功率为20wC.小明推课桌时,课桌受到的摩擦力大小为20ND.小明推课桌时,课桌沿水平面以4m/s做匀速直线运动4.关于图3的甲、乙中各物理量的关系有以下的描述,正确的是()(1)I1=I2=I3=I4(2)U1=U2=U3=U4(3)U3=U4,U2≠U4(4)I1=I2,I2≠I4A.(2)、(4)B.(1)、(2)C.(3)、(4)D. (1)、(3)5.用如图4所示的滑轮组把一个重为30 N的物体沿竖直方向匀速提升0.6 m,拉力为12 N,不计绳重与摩擦,下列说法正确的是( )A.滑轮组机械效率是83.3%B.承重绳子段数是2C.动滑轮重是18 ND.绳子自由端移动距离是0.2 m6.图5中,线圈abcd转动过程中经过图甲、乙位置时,导线a b所受磁场力的方向()A. 相反,是由于磁场方向相反了B. 相反,是由于流过a b的电流方向相反C. 相同,是由于磁场方向、流过a b的电流方向都改变了D. 相同,是由于磁场方向、流过a b的电流方向都没改变7. 如图6所示,木块从水平地面上P点以速度v向右运动冲上斜面,停在Q点。

2017-2018学年最新江苏省无锡市中考数学第一次模拟试题及答案解析

2017-2018学年最新江苏省无锡市中考数学第一次模拟试题及答案解析

2018年江苏省无锡市中考数学一模试卷一、选择题(本大题共10小题,每题3分,共计30分.在每小题所给出的四个选项中,恰有一项是符合题目要求的,请用2B铅笔把答题卷上相应的答案涂黑.)1.﹣3的绝对值是()A.3 B.﹣3 C.D.2.计算(﹣xy3)2的结果是()A.x2y6 B.﹣x2y6C.x2y9 D.﹣x2y93.如图,BC⊥AE于点C,CD∥AB,∠B=40°,则∠ECD的度数是()A.70°B.60°C.50°D.40°4.有6个相同的立方体搭成的几何体如图所示,则它的主视图是()A.B.C.D.5.下列调查中,适宜采用普查方式的是()A.了解一批圆珠笔的寿命B.了解全国九年级学生身高的现状C.考察人们保护海洋的意识D.检查一枚用于发射卫星的运载火箭的各零部件6.若是关于x、y的二元一次方程ax﹣3y=1的解,则a的值为()A.﹣5 B.﹣1 C.2 D.77.直线y=2x+2沿y轴向下平移6个单位后与y轴的交点坐标是()A.(0,2)B.(0,8)C.(0,4)D.(0,﹣4)8.如图,已知菱形ABCD的对角线AC、BD的长分别为6cm、8cm,AE⊥BC于点E,则AE的长是()A.B.C.D.9.如图,在矩形ABCD中,AB=4,AD=5,AD,AB,BC分别与⊙O相切于E,F,G 三点,过点D作⊙O的切线BC于点M,切点为N,则DM的长为()A.B.C.D.210.如图,在Rt△ABC中,∠ACB=90°,点D是AB边的中点,过D作DE⊥BC于点E,点P是边BC上的一个动点,AP与CD相交于点Q.当AP+PD的值最小时,AQ与PQ之间的数量关系是()A.AQ=PQ B.AQ=3PQ C.AQ=PQ D.AQ=4PQ二、填空题(本大题共8小题,每题2分,共计16分.请把答案直接填写在答题卷相应位置上.)11.函数y=中,自变量x的取值范围是.12.分解因式:ab3﹣4ab= .13.2016年我国大学毕业生将达到7650000人,该数据用科学记数法可表示为.14.一个扇形的圆心角为60°半径为6cm,则这个扇形的弧长为cm.(结果保留π)15.已知反比例函数的图象经过点(m,4)和点(8,﹣2),则m的值为.16.如图,△ABC中,D为BC上一点,∠BAD=∠C,AB=6,BD=4,则CD的长为.17.如图,C、D是线段AB上两点,且AC=BD=AB=1,点P是线段CD上一个动点,在AB同侧分别作等边△PAE和等边△PBF,M为线段EF的中点.在点P从点C移动到点D时,点M运动的路径长度为.18.如图坐标系中,O(0,0),A(6,6),B(12,0),将△OAB沿直线线CD折叠,使点A恰好落在线段OB上的点E处,若OE=,则CE:DE的值是.三、解答题(本大题共10小题,共计84分.解答需写出必要的文字说明或演算步骤.)19.(1)计算:﹣|﹣2|+2×(﹣3);(2)化简:(1+)÷.20.(1)解方程:1+=;(2)解不等式组:.21.如图,在▱ABCD中,点E,F在AC上,且∠ABE=∠CDF,求证:BE=DF.22.一个不透明的口袋中装有2个红球(记为红球1、红球2),1个白球、1个黑球,这些球除颜色外都相同,将球搅匀.(1)从中任意摸出1个球,恰好摸到红球的概率是(2)先从中任意摸出一个球,再从余下的3个球中任意摸出1个球,请用列举法(画树状图或列表),求两次都摸到红球的概率.23.图1、图2是两张形状、大小完全相同的方格纸,方格纸中的每个小正方形的边长均为1,每个小正方形的顶点叫做格点.(1)在图1中画出等腰直角三角形MON,使点N在格点上,且∠MON=90°;(2)在图2中以格点为顶点画一个正方形ABCD,使正方形ABCD面积等于(1)中等腰直角三角形MON面积的4倍,并将正方形ABCD分割成以格点为顶点的四个全等的直角三角形和一个正方形,且正方形ABCD面积没有剩余(画出一种即可).24.某厂生产A,B两种产品,其单价随市场变化而做相应调整.营销人员根据前三次单价变化的情况,绘制了如表统计表及不完整的折线图.A,B产品单价变化统计表第一次第二次第三次A产品单价(元/件) 6 5.2 6.5B产品单价(元/件) 3.5 4 3并求得了A产品三次单价的平均数和方差:2=[(6﹣5.9)2+(5.2﹣5.9)2+(6.5﹣5.9)2]==5.9,sA(1)补全如图中B产品单价变化的折线图.B产品第三次的单价比上一次的单价降低了%(2)求B产品三次单价的方差,并比较哪种产品的单价波动小;(3)该厂决定第四次调价,A产品的单价仍为6.5元/件,B产品的单价比3元/件上调m%(m>0),使得A产品这四次单价的中位数是B产品四次单价中位数的2倍少1,求m的值.25.某工厂接受了20天内生产1200台GH型电子产品的总任务.已知每台GH型产品由4个G型装置和3个H型装置配套组成.工厂现有80名工人,每个工人每天能加工6个G型装置或3个H型装置.工厂将所有工人分成两组同时开始加工,每组分别加工一种装置,并要求每天加工的G、H型装置数量正好全部配套组成GH型产品.(1)按照这样的生产方式,工厂每天能配套组成多少套GH型电子产品?(2)为了在规定期限内完成总任务,工厂决定补充一些新工人,这些新工人只能独立进行G型装置的加工,且每人每天只能加工4个G型装置.请问至少需要补充多少名新工人?26.已知边长为3的正方形ABCD中,点E在射线BC上,且BE=2CE,连接AE交射处.线DC于点F,若△ABE沿直线AE翻折,点B落在点B1(1)如图1,若点E在线段BC上,求CF的长;(2)求sin∠DAB的值;1(3)如果题设中“BE=2CE”改为“=x”,其它条件都不变,试写出△ABE翻折后与正方形ABCD公共部分的面积y与x的关系式及自变量x的取值范围(只要写出结论,不需写出解题过程).27.如图,抛物线y=﹣x2+bx+c与x轴交于A、B两点,且B点的坐标为(3,0),经过A点的直线交抛物线于点D(2,3).(1)求抛物线的解析式和直线AD的解析式;(2)过x轴上的点(a,0)作直线EF∥AD,交抛物线于点F,是否存在实数a,使得以A、D、E、F为顶点的四边形是平行四边形?如果存在,求出满足条件的a;如果不存在,请说明理由.28.如图,Rt△ABC中,M为斜边AB上一点,且MB=MC=AC=8cm,平行于BC的直线l从BC的位置出发以每秒1cm的速度向上平移,运动到经过点M时停止.直线l分别交线段MB、MC、AC于点D、E、P,以DE为边向下作等边△DEF,设△DEF与△MBC 重叠部分的面积为S(cm2),直线l的运动时间为t(秒).(1)求边BC的长度;(2)求S与t的函数关系式;(3)在整个运动过程中,是否存在这样的时刻t,使得以P、C、F为顶点的三角形为等腰三角形?若存在,请求出t的值;若不存在,请说明理由.(4)在整个运动过程中,是否存在这样的时刻t,使得以点D为圆心、BD为半径的圆与直线EF相切?若存在,请求出t的值;若不存在,请说明理由.参考答案与试题解析一、选择题(本大题共10小题,每题3分,共计30分.在每小题所给出的四个选项中,恰有一项是符合题目要求的,请用2B铅笔把答题卷上相应的答案涂黑.)1.﹣3的绝对值是()A.3 B.﹣3 C.D.【考点】绝对值.【分析】根据一个负数的绝对值等于它的相反数得出.【解答】解:|﹣3|=﹣(﹣3)=3.故选:A.2.计算(﹣xy3)2的结果是()A.x2y6 B.﹣x2y6C.x2y9 D.﹣x2y9【考点】幂的乘方与积的乘方.【分析】根据幂的乘方和积的乘方的运算方法:①(a m)n=a mn(m,n是正整数);②(ab)n=a n b n(n是正整数);求出计算(﹣xy3)2的结果是多少即可.【解答】解:(﹣xy3)2=(﹣x)2•(y3)2=x2y6,即计算(﹣xy3)2的结果是x2y6.故选:A.3.如图,BC⊥AE于点C,CD∥AB,∠B=40°,则∠ECD的度数是()A.70°B.60°C.50°D.40°【考点】平行线的性质;垂线.【分析】由BC与AE垂直,得到三角形ABC为直角三角形,利用直角三角形两锐角互余,求出∠A的度数,再利用两直线平行同位角相等即可求出∠ECD的度数.【解答】解:∵BC⊥AE,∴∠ACB=90°,在Rt△ABC中,∠B=40°,∴∠A=90°﹣∠B=50°,∵CD∥AB,∴∠ECD=∠A=50°,故选C.4.有6个相同的立方体搭成的几何体如图所示,则它的主视图是()A.B.C.D.【考点】简单组合体的三视图.【分析】根据主视图是从正面看得到的图形,可得答案.【解答】解:从正面看第一层三个小正方形,第二层左边一个小正方形,右边一个小正方形.故选:C.5.下列调查中,适宜采用普查方式的是()A.了解一批圆珠笔的寿命B.了解全国九年级学生身高的现状C.考察人们保护海洋的意识D.检查一枚用于发射卫星的运载火箭的各零部件【考点】全面调查与抽样调查.【分析】普查和抽样调查的选择.调查方式的选择需要将普查的局限性和抽样调查的必要性结合起来,具体问题具体分析,普查结果准确,所以在要求精确、难度相对不大,实验无破坏性的情况下应选择普查方式,当考查的对象很多或考查会给被调查对象带来损伤破坏,以及考查经费和时间都非常有限时,普查就受到限制,这时就应选择抽样调查.【解答】解:A、了解一批圆珠笔芯的使用寿命,由于具有破坏性,应当使用抽样调查,故本选项错误;B、了解全国九年级学生身高的现状,人数多,耗时长,应当采用抽样调查的方式,故本选项错误;C、考察人们保护海洋的意识,人数多,耗时长,应当采用抽样调查的方式,故本选项错误;D、检查一枚用于发射卫星的运载火箭的各零部件,事关重大,应用普查方式,故本选项正确;故选:D.6.若是关于x、y的二元一次方程ax﹣3y=1的解,则a的值为()A.﹣5 B.﹣1 C.2 D.7【考点】二元一次方程的解.【分析】根据题意得,只要把代入ax﹣3y=1中,即可求出a的值.【解答】解:把代入ax﹣3y=1中,∴a﹣3×2=1,a=1+6=7,故选:D,7.直线y=2x+2沿y轴向下平移6个单位后与y轴的交点坐标是()A.(0,2)B.(0,8)C.(0,4)D.(0,﹣4)【考点】一次函数图象与几何变换.【分析】根据平移可得直线y=2x+2沿y轴向下平移6个单位后解析式为y=2x+2﹣6=2x ﹣4,再求出与y轴的交点即可.【解答】解:直线y=2x+2沿y轴向下平移6个单位后解析式为y=2x+2﹣6=2x﹣4,当x=0时,y=﹣4,因此与y轴的交点坐标是(0,﹣4),故选:D8.如图,已知菱形ABCD的对角线AC、BD的长分别为6cm、8cm,AE⊥BC于点E,则AE的长是()A.B.C.D.【考点】菱形的性质;勾股定理.【分析】根据菱形的性质得出BO、CO的长,在RT△BOC中求出BC,利用菱形面积等于对角线乘积的一半,也等于BC×AE,可得出AE的长度.【解答】解:∵四边形ABCD是菱形,∴CO=AC=3cm,BO=BD=4cm,AO⊥BO,∴BC==5cm,==×6×8=24cm2,∴S菱形ABCD=BC×AE,∵S菱形ABCD∴BC×AE=24,∴AE=cm,故选D.9.如图,在矩形ABCD中,AB=4,AD=5,AD,AB,BC分别与⊙O相切于E,F,G 三点,过点D作⊙O的切线BC于点M,切点为N,则DM的长为()A.B.C.D.2【考点】切线的性质;矩形的性质.【分析】连接OE,OF,ON,OG,在矩形ABCD中,得到∠A=∠B=90°,CD=AB=4,由于AD,AB,BC分别与⊙O相切于E,F,G三点得到∠AEO=∠AFO=∠OFB=∠BGO=90°,推出四边形AFOE,FBGO是正方形,得到AF=BF=AE=BG=2,由勾股定理列方程即可求出结果.【解答】解:连接OE,OF,ON,OG,在矩形ABCD中,∵∠A=∠B=90°,CD=AB=4,∵AD,AB,BC分别与⊙O相切于E,F,G三点,∴∠AEO=∠AFO=∠OFB=∠BGO=90°,∴四边形AFOE,FBGO是正方形,∴AF=BF=AE=BG=2,∴DE=3,∵DM是⊙O的切线,∴DN=DE=3,MN=MG,∴CM=5﹣2﹣MN=3﹣MN,△DMC中,DM2=CD2+CM2,在Rt∴(3+NM)2=(3﹣NM)2+42,∴NM=,∴DM=3=,故选A.10.如图,在Rt△ABC中,∠ACB=90°,点D是AB边的中点,过D作DE⊥BC于点E,点P是边BC上的一个动点,AP与CD相交于点Q.当AP+PD的值最小时,AQ与PQ之间的数量关系是()A.AQ=PQ B.AQ=3PQ C.AQ=PQ D.AQ=4PQ【考点】轴对称-最短路线问题.【分析】如图,作点A关于BC的对称点A′,连接A′D交BC于点P,此时PA+PD最小.作DM∥BC交AC于M,交PA于N,利用平行线的性质,证明AN=PN,利用全等三角形证明NQ=PQ,即可解决问题.【解答】解:如图,作点A关于BC的对称点A′,连接A′D交BC于点P,此时PA+PD 最小.作DM∥BC交AC于M,交PA于N.∵∠ACB=∠DEB=90°,∴DE∥AC,∵AD=DB,∴CE=EB,∴DE=AC=CA′,∵DE∥CA′,∴==,∵DM∥BC,AD=DB,∴AM=MC,AN=NP,∴DM=BC=CE=EB,MN=PC,∴MN=PE,ND=PC,在△DNQ和△CPQ中,,∴△DNQ≌△CPQ,∴NQ=PQ,∵AN=NP,∴AQ=3PQ.故选B.二、填空题(本大题共8小题,每题2分,共计16分.请把答案直接填写在答题卷相应位置上.)11.函数y=中,自变量x的取值范围是x≥﹣2 .【考点】函数自变量的取值范围.【分析】函数关系中主要有二次根式.根据二次根式的意义,被开方数是非负数即可求解.【解答】解:根据题意得:x+2≥0,解得x≥﹣2.故答案为:x≥﹣2.12.分解因式:ab3﹣4ab= ab(b+2)(b﹣2).【考点】提公因式法与公式法的综合运用.【分析】先提取公因式ab,再对余下的多项式利用平方差公式继续分解.【解答】解:ab3﹣4ab,=ab(b2﹣4),=ab(b+2)(b﹣2).故答案为:ab(b+2)(b﹣2).13.2016年我国大学毕业生将达到7650000人,该数据用科学记数法可表示为7.65×106.【考点】科学记数法—表示较大的数.【分析】科学记数法的表示形式为a×10n的形式,其中1≤|a|<10,n为整数.确定n 的值时,要看把原数变成a时,小数点移动了多少位,n的绝对值与小数点移动的位数相同.当原数绝对值>1时,n是正数;当原数的绝对值<1时,n是负数.【解答】解:将7650000用科学记数法表示为:7.65×106.故答案为:7.65×106.14.一个扇形的圆心角为60°半径为6cm,则这个扇形的弧长为2πcm.(结果保留π)【考点】圆锥的计算.【分析】利用弧长公式是l=,代入就可以求出弧长.【解答】解:弧长是:=2πcm.故答案为:2π.15.已知反比例函数的图象经过点(m,4)和点(8,﹣2),则m的值为﹣4 .【考点】反比例函数图象上点的坐标特征.【分析】根据反比例函数图象上点的坐标特征得到4×m=8×(﹣2),然后解一次方程即可.【解答】解:根据题意得4×m=8×(﹣2),解得m=﹣4.故答案为﹣4.16.如图,△ABC中,D为BC上一点,∠BAD=∠C,AB=6,BD=4,则CD的长为 5 .【考点】相似三角形的判定与性质.【分析】易证△BAD∽△BCA,然后运用相似三角形的性质可求出BC,从而可得到CD 的值.【解答】解:∵∠BAD=∠C,∠B=∠B,∴△BAD∽△BCA,∴=.∵AB=6,BD=4,∴=,∴BC=9,∴CD=BC﹣BD=9﹣4=5.故答案为5.17.如图,C、D是线段AB上两点,且AC=BD=AB=1,点P是线段CD上一个动点,在AB同侧分别作等边△PAE和等边△PBF,M为线段EF的中点.在点P从点C移动到点D时,点M运动的路径长度为 2 .【考点】轨迹.【分析】分别延长AE、BF交于点H,易证四边形EPFH为平行四边形,得出M为PH中点,则M的运行轨迹为三角形HCD的中位线GN.再求出CD的长,运用中位线的性质求出GN的长度即可.【解答】解:如图,分别延长AE、BF交于点H,∵∠A=∠FPB=60°,∴AH∥PF,∵∠B=∠EPA=60°,∴BH∥PE,∴四边形EPFH为平行四边形,∴EF与HP互相平分.∵M为EF的中点,∴M正好为PH中点,即在P的运动过程中,M始终为PH的中点,所以M的运行轨迹为三角形HCD的中位线GN.∵CD=6﹣1﹣1=4,∴GN=CD=2,即M的移动路径长为2.故答案为:2.18.如图坐标系中,O(0,0),A(6,6),B(12,0),将△OAB沿直线线CD折叠,使点A恰好落在线段OB上的点E处,若OE=,则CE:DE的值是.【考点】翻折变换(折叠问题);坐标与图形性质.【分析】过A作AF⊥OB于F,根据已知条件得到△AOB是等边三角形,推出△CEO∽△DBE,根据相似三角形的性质得到,设CE=a,则CA=a,CO=12﹣a,ED=b,则AD=b,OB=12﹣b,于是得到24b=60a﹣5ab,36a=60b﹣5ab,两式相减得到36a ﹣24b=60b﹣60a,即可得到结论.【解答】解:过A作AF⊥OB于F,∵A(6,6),B(12,0),∴AF=6,OF=6,OB=12,∴BF=6,∴OF=BF,∴AO=AB,∵tan∠AOB=,∴∠AOB=60°,∴△AOB是等边三角形,∴∠AOB=∠ABO=60°,∵将△OAB沿直线线CD折叠,使点A恰好落在线段OB上的点E处,∴∠CED=∠OAB=60°,∴∠OCE=∠DEB,∴△CEO∽△DBE,∴,设CE=a,则CA=a,CO=12﹣a,ED=b,则AD=b,OB=12﹣b,,∴24b=60a﹣5ab ①,,∴36a=60b﹣5ab ②,②﹣①得:36a﹣24b=60b﹣60a,∴=,即CE:DE=.故答案为:.三、解答题(本大题共10小题,共计84分.解答需写出必要的文字说明或演算步骤.)19.(1)计算:﹣|﹣2|+2×(﹣3);(2)化简:(1+)÷.【考点】分式的混合运算;实数的运算.【分析】(1)根据算术平方根的概念、绝对值的性质以及有理数的乘法法则计算即可;(2)根据分式的通分和约分法则计算.【解答】解:(1)原式=4﹣2﹣6=﹣4;(2)原式=•=.20.(1)解方程:1+=;(2)解不等式组:.【考点】解分式方程;解一元一次不等式组.【分析】(1)分式方程去分母转化为整式方程,求出整式方程的解得到x的值,经检验即可得到分式方程的解;(2)分别求出不等式组中两不等式的解集,找出解集的公共部分即可.【解答】解:(1)去分母,x﹣2+3x=6,解得:x=2,经检验:x=2是原方程的增根,∴原方程无解;(2),由①得,x<﹣1,由②得,x≤﹣8,∴原不等式组的解集是x≤﹣8.21.如图,在▱ABCD中,点E,F在AC上,且∠ABE=∠CDF,求证:BE=DF.【考点】全等三角形的判定与性质;平行四边形的性质.【分析】根据平行四边形的性质,证明AB=CD,AB∥CD,进而证明∠BAC=∠CDF,根据ASA即可证明△ABE≌△CDF,根据全等三角形的对应边相等即可证明.【解答】证明:∵四边形ABCD是平行四边形,∴AB=CD,AB∥CD,∴∠BAC=∠CDF,∴△ABE和△CDF中,,∴△ABE≌△CDF,∴BE=DF.22.一个不透明的口袋中装有2个红球(记为红球1、红球2),1个白球、1个黑球,这些球除颜色外都相同,将球搅匀.(1)从中任意摸出1个球,恰好摸到红球的概率是(2)先从中任意摸出一个球,再从余下的3个球中任意摸出1个球,请用列举法(画树状图或列表),求两次都摸到红球的概率.【考点】列表法与树状图法;概率公式.【分析】(1)根据4个小球中红球的个数,即可确定出从中任意摸出1个球,恰好摸到红球的概率;(2)列表得出所有等可能的情况数,找出两次都摸到红球的情况数,即可求出所求的概率.【解答】解:(1)4个小球中有2个红球,则任意摸出1个球,恰好摸到红球的概率是;故答案为:;(2)列表如下:红红白黑红﹣﹣﹣(红,红)(白,红)(黑,红)红(红,红)﹣﹣﹣(白,红)(黑,红)白(红,白)(红,白)﹣﹣﹣(黑,白)黑(红,黑)(红,黑)(白,黑)﹣﹣﹣所有等可能的情况有12种,其中两次都摸到红球有2种可能,则P(两次摸到红球)==.23.图1、图2是两张形状、大小完全相同的方格纸,方格纸中的每个小正方形的边长均为1,每个小正方形的顶点叫做格点.(1)在图1中画出等腰直角三角形MON,使点N在格点上,且∠MON=90°;(2)在图2中以格点为顶点画一个正方形ABCD,使正方形ABCD面积等于(1)中等腰直角三角形MON面积的4倍,并将正方形ABCD分割成以格点为顶点的四个全等的直角三角形和一个正方形,且正方形ABCD面积没有剩余(画出一种即可).【考点】作图—应用与设计作图.【分析】(1)过点O向线段OM作垂线,此直线与格点的交点为N,连接MN即可;(2)根据勾股定理画出图形即可.【解答】解:(1)如图1所示;(2)如图2、3所示;24.某厂生产A,B两种产品,其单价随市场变化而做相应调整.营销人员根据前三次单价变化的情况,绘制了如表统计表及不完整的折线图.A,B产品单价变化统计表第一次第二次第三次A产品单价(元/件) 6 5.2 6.5B产品单价(元/件) 3.5 4 3并求得了A产品三次单价的平均数和方差:2=[(6﹣5.9)2+(5.2﹣5.9)2+(6.5﹣5.9)2]==5.9,sA(1)补全如图中B产品单价变化的折线图.B产品第三次的单价比上一次的单价降低了25 %(2)求B产品三次单价的方差,并比较哪种产品的单价波动小;(3)该厂决定第四次调价,A产品的单价仍为6.5元/件,B产品的单价比3元/件上调m%(m>0),使得A产品这四次单价的中位数是B产品四次单价中位数的2倍少1,求m的值.【考点】方差;统计表;折线统计图;算术平均数;中位数.【分析】(1)根据题目提供数据补充折线统计图即可;(2)分别计算平均数及方差即可;(3)首先确定这四次单价的中位数,然后确定第四次调价的范围,根据“A产品这四次单价的中位数是B产品四次单价中位数的2倍少1”列式求m即可.【解答】解:(1)如图2所示:B产品第三次的单价比上一次的单价降低了=25%,(2)=(3.5+4+3)=3.5,==,∵B产品的方差小,∴B产品的单价波动小;(3)第四次调价后,对于A产品,这四次单价的中位数为=;对于B产品,∵m>0,∴第四次单价大于3,∵﹣1>,∴第四次单价小于4,∴×2﹣1=,∴m=25.25.某工厂接受了20天内生产1200台GH型电子产品的总任务.已知每台GH型产品由4个G型装置和3个H型装置配套组成.工厂现有80名工人,每个工人每天能加工6个G型装置或3个H型装置.工厂将所有工人分成两组同时开始加工,每组分别加工一种装置,并要求每天加工的G、H型装置数量正好全部配套组成GH型产品.(1)按照这样的生产方式,工厂每天能配套组成多少套GH型电子产品?(2)为了在规定期限内完成总任务,工厂决定补充一些新工人,这些新工人只能独立进行G型装置的加工,且每人每天只能加工4个G型装置.请问至少需要补充多少名新工人?【考点】一元一次不等式的应用;一元一次方程的应用.【分析】(1)设有x名工人加工G型装置,则有(80﹣x)名工人加工H型装置,利用每台GH型产品由4个G型装置和3个H型装置配套组成得出等式求出答案;(2)设招聘a名新工人加工G型装置,设x名工人加工G型装置,(80﹣x)名工人加工H型装置,进而利用每天加工的G、H型装置数量正好全部配套组成GH型产品得出等式表示出x的值,进而利用不等式解法得出答案.【解答】解:(1)设有x名工人加工G型装置,则有(80﹣x)名工人加工H型装置,根据题意,=,解得x=32,则80﹣32=48(套),答:每天能组装48套GH型电子产品;(2)设招聘a名新工人加工G型装置仍设x名工人加工G型装置,(80﹣x)名工人加工H型装置,根据题意,=,整理可得,x=,另外,注意到80﹣x≥,即x≤20,于是≤20,解得:a≥30,答:至少应招聘30名新工人,26.已知边长为3的正方形ABCD中,点E在射线BC上,且BE=2CE,连接AE交射线DC于点F,若△ABE沿直线AE翻折,点B落在点B处.1(1)如图1,若点E在线段BC上,求CF的长;的值;(2)求sin∠DAB1(3)如果题设中“BE=2CE”改为“=x”,其它条件都不变,试写出△ABE翻折后与正方形ABCD公共部分的面积y与x的关系式及自变量x的取值范围(只要写出结论,不需写出解题过程).【考点】翻折变换(折叠问题);勾股定理;正方形的性质;锐角三角函数的定义.【分析】(1)利用平行线性质以及线段比求出CF的值;(2)本题要分两种方法讨论:①若点E在线段BC上;②若点E在边BC的延长线上.需运用勾股定理求出与之相联的线段;(3)本题分两种情况讨论:若点E在线段BC上,y=,定义域为x>0;若点E在边BC的延长线上,y=,定义域为x>1.【解答】解:(1)∵AB∥DF,∴=,∵BE=2CE,AB=3,∴=,∴CF=;与DC相交于点M.(2)①若点E在线段BC上,如图1,设直线AB1由题意翻折得:∠1=∠2.∵AB∥DF,∴∠1=∠F,∴∠2=∠F,∴AM=MF.设DM=x,则CM=3﹣x.又∵CF=1.5,∴AM=MF=﹣x,在Rt△ADM中,AD2+DM2=AM2,∴32+x2=(﹣x)2,∴x=,∴DM=,AM=,∴sin∠DAB==;1②若点E在边BC的延长线上,如图2,设直线AB1与CD延长线相交于点N.同理可得:AN=NF.∵BE=2CE,∴BC=CE=AD.∵AD∥BE,∴=,∴DF=FC=,设DN=x,则AN=NF=x+.在Rt△ADN中,AD2+DN2=AN2,∴32+x2=(x+)2,∴x=.==;∴DN=,AN=sin∠DAB1(3)若点E在线段BC上,y=,定义域为x>0;若点E在边BC的延长线上,y=,定义域为x>1.27.如图,抛物线y=﹣x2+bx+c与x轴交于A、B两点,且B点的坐标为(3,0),经过A点的直线交抛物线于点D(2,3).(1)求抛物线的解析式和直线AD的解析式;(2)过x轴上的点(a,0)作直线EF∥AD,交抛物线于点F,是否存在实数a,使得以A、D、E、F为顶点的四边形是平行四边形?如果存在,求出满足条件的a;如果不存在,请说明理由.【考点】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;平行四边形的判定.【分析】(1)把点B和D的坐标代入抛物线y=﹣x2+bx+c得出方程组,解方程组即可;由抛物线解析式求出点A的坐标,设直线AD的解析式为y=kx+a,把A和D的坐标代入得出方程组,解方程组即可;(2)分两种情况:①当a<﹣1时,DF∥AE且DF=AE,得出F(0,3),由AE=﹣1﹣a=2,求出a的值;②当a>﹣1时,显然F应在x轴下方,EF∥AD且EF=AD,设F (a﹣3,﹣3),代入抛物线解析式,即可得出结果.【解答】解:(1)把点B和D的坐标代入抛物线y=﹣x2+bx+c得:,解得:b=2,c=3,∴抛物线的解析式为y=﹣x2+2x+3;当y=0时,﹣x2+2x+3=0,解得:x=3,或x=﹣1,∵B(3,0),∴A(﹣1,0);设直线AD的解析式为y=kx+a,把A和D的坐标代入得:,解得:k=1,a=1,∴直线AD的解析式为y=x+1;(2)分两种情况:如图所示:①当a<﹣1时,DF∥AE且DF=AE,则F点即为(0,3),∵AE=﹣1﹣a=2,∴a=﹣3;②当a>﹣1时,显然F应在x轴下方,EF∥AD且EF=AD,设F (a﹣3,﹣3),由﹣(a﹣3)2+2(a﹣3)+3=﹣3,解得:a=4±;综上所述,满足条件的a的值为﹣3或4±.28.如图,Rt△ABC中,M为斜边AB上一点,且MB=MC=AC=8cm,平行于BC的直线l从BC的位置出发以每秒1cm的速度向上平移,运动到经过点M时停止.直线l分别交线段MB、MC、AC于点D、E、P,以DE为边向下作等边△DEF,设△DEF与△MBC 重叠部分的面积为S(cm2),直线l的运动时间为t(秒).(1)求边BC的长度;(2)求S与t的函数关系式;(3)在整个运动过程中,是否存在这样的时刻t,使得以P、C、F为顶点的三角形为等腰三角形?若存在,请求出t的值;若不存在,请说明理由.(4)在整个运动过程中,是否存在这样的时刻t,使得以点D为圆心、BD为半径的圆与直线EF相切?若存在,请求出t的值;若不存在,请说明理由.【考点】几何变换综合题.【分析】(1)利用直角三角形的性质和锐角三角函数即可,(2)分两段求出函数关系式:当0<t≤3时,S=﹣t2+8t,当3<t≤4时,S=3t2﹣24t+48(3)当0<t≤3时,∠FCP≥90°,故△PCF不可能为等腰三角形当3<t≤4时,若△PCF为等腰三角形,也只能FC=FP,=3(4﹣t),得t=.(4)若相切,利用点到圆心的距离等于半径列出方程即可.【解答】解:(1)∵M为斜边中点,∴∠B=MCB=α,∴∠AMC=2α,∵MC=MA,∴∠A=∠AMC=2α,∴∠B+∠A=90°,∴α+2α=90°,∴α=30°,∴∠B=30°,∵cotB=,∴BC=AC×cotB=8;(2)由题意,若点F恰好落在BC上,∴MF=4(4﹣t)=4,∴t=3.当0<t≤3时,如图,∴BD=2t,DM=8﹣2t,∵l∥BC,∴,∴,∴DE=(8﹣2t).∴点D到EF的距离为FJ=DE=3(4﹣t),∵l∥BC,∴,∵FN=FJ﹣JN=3(4﹣t)﹣t=12﹣4t,∴HG=(3﹣t)S=S=(HG+DE)×FN=﹣t2+8t当3<t≤4时,重叠部分就是△DEF,=DE2=3t2﹣24t+48.S=S(3)当0<t≤3时,∠FCP≥90°,∴FC>CP,∴△PCF不可能为等腰三角形当3<t≤4时,若△PCF为等腰三角形,∴只能FC=FP,∴=3(4﹣t),∴t=(4)若相切,∵∠B=30°,∴BD=2t,DM=8﹣2t,∵l∥BC,∴,∴,∴DE=(8﹣2t).∴点D到EF的距离为DE=3(4﹣t)∴2t=3(4﹣t),解得t=.2016年6月9日。

无锡市2018年初三年级数学试题中考模拟考试含答案.docx

无锡市2018年初三年级数学试题中考模拟考试含答案.docx

无锡市 2018 年初三年级数学试题中考模拟考试含答案2018.4一、选择题:本大题共 10 小题,每小题 3 分,共 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, 请将正确选项的序号填写在题答题卡的相应的括号内. ....1.- 3 的倒数是()11A .3B . 3C .± 3D .- 3 .2.使 x-2 有意义的 x 的取值范围是( ) A .x > 1 B . x >2 C . x ≥ 2 12 D . x ≥ .23.下列事件中最适合使用普查方式收集数据的是 ( )A .了解某班同学的体重情况B .了解我省初中学生的兴趣爱好情况C .了解一批电灯泡的使用寿命D .了解我省农民工的年收入情况.4.如左图是由几个相同的小正方体搭成的一个几何体,它的左视图是(5.方程 2x - 1= 3x +2 的解为 A.B .C .A .x = 1B . x =- 1C . x = 36.如图 A , D 是⊙ O 上两点, BC 是直径.若∠D=35 ,则∠ OAB A .35B . 55 C . 65D .70 )D .(D . x =- 3.的度数是(.))7.下列图形中,是轴对称图形但不是中心对称图形的是()A .等边三角形B .平行四边形C .矩形D .圆.8.如图,直线 a ∥ b ,三角板的直角顶点放在直线b 上,两直角边与直线 a 相交,如果∠ 1=55 °,那么∠ 2 等于()A. 65°B .55°C .45°D. 35 .°9.如图, 将正方形 ABCD 的一角折向边CD ,使点 A 与 CB 上一点 E 重合,若 BE =1,CE=2,则折痕 FG 的长度为( )A. 10B. 2 2C . 3D . 4 .A ADGD1aF D /COB2bBEC第 8 题图第 6 题图第 9 题图10.经过点 (2,- 1)作一条直线和反比例函数y2相交, 当他们有且只有一个公共点时,x这样的直线存在( )A . 2 条B. 3 条 C.4条D.无数条.二、填空题(本大题共8 小题,每小题 2 分,共 16 分,不需要写出解答过程,请把答案填写在答题卡的相应位置的横线上)11. 2017 年我市参加中考的人数大约有11000 人,将 11000 用科学记数法表示为.12.因式分解: ab2- 9a=.13.当x =1时,分式x+2无意义 .k14.若反比例函数 y= x的图像经过点A(2, 5)和点 B( 1, n),则 n=.15.已知圆柱的底面半径为3cm,母线长为 5cm,则圆柱的侧面积是cm.16.居民用电计费实行“一户一表”政策,以年为周期执行阶梯电价,即:一户居民全年不超过 2880度的电量,执行第一档电价标准为0.48 元/度;全年用电量在2880 度到 4800度之间(含4800),超过2880 度的部分,执行第二档电价标准为0.53元 /度;全年用电量超过 4800 度,超过 4800 度的部分,执行第三档电价标准为0.78 元/度.小敏家 2017年用电量为3000 度,则2017 年小敏家电费为元.17.在四边形 ABCD 中,AD = 4,CD =3,∠ ABC=∠ ACB=∠ ADC = 45°,则 BD 的长为.D ACB第17 题18.在平面直角坐标系中,已知平行四边形ABCD 的点 A ( 0,-2)、点 B( 3m, 4m+1)(m≠-1),点 C( 6, 2),则对角线B D 的最小值是.三、解答题(本大题共 10 小题,共84 分.请在答题卡题目下方空白处作答,解答时应.......写出文字说明、证明过程或演算步骤)19.(本小题满分 8 分)计算 :( 1) tan30o- (- 2)2-.( 2) (2x- 1)2+( x-2)(x+2) .20. (本题满分8 分 )( 1)解方程:1xx- 3(x-2)≤4,= 2+.( 2)解不等式组:1+2x> x-1.x- 33-x321. (本题满分 6 分)如图,正方形AEFG的顶点 E、G 在正方形 ABCD的边 AB、AD 上,连接BF 、 DF .(1) 求证: BF=DF ;(2) 连接 CF,请直接写出CF(不必写出计算过程) .的值为BEB CEFAGD22.(本题满分 6 分)某校组织学生书法比赛,对参赛作品按 A、B、C、 D 四个等级进行了评定.现随机取部分学生书法作品的评定结果进行分析,并绘制扇形统计图和条形统计图如下:分析结果的扇形统计图人数分析结果的条形统计图6048D 级 A 级5020%40C 级302430%B 级2010根据上述信息完成下列问题:B C 等级A D 图①图②(1)求这次抽取的样本的容量;(2)请在图②中把条形统计图补充完整;( 3)已知该校这次活动共收到参赛作品750 份,请你估计参赛作品达到 B 级以上(即A 级和 B 级)有多少份?23. (本题满分8 分)甲、乙两人用手指玩游戏,规则如下:(1)每次游戏时,两人同时随机地各伸出一根手指;( 2)两人伸出的手指中,大拇指只胜食指,食指只胜中指,中指只胜无名指,无名指只胜小拇指,小拇指只胜大拇指,否则不分胜负,依据上述规则,当甲、乙两人同时随机地各伸出一根手指时,( 1)求甲伸出小拇指取胜的概率(请用“画树状图”或“列表”等方法写出分析过程);( 2)求乙取胜的概率.24.(本题满分 8 分)如图,△ ABC 中, AB=AC,以 AB 为直径的⊙ O 与 BC 相交于点 D,与 CA 的延长线相交于点 E,过点 D 作 DF⊥ AC 于点 F.(1)试说明 DF 是⊙ O 的切线;(2)若 AC=3 AE,求 tanC.25、(本题满分 10分)今年我市某公司分两次采购了一批第 24 题大蒜,第一次花费40 万元,第二次花费 60 万元,已知第一次采购时每吨大蒜的价格比去年的平均价格上涨了500 元,第二次采购时每吨大蒜的价格比去年的平均价格下降了 500元,第二次采购的数量是第一次采购数量的两倍.( 1)试问去年每吨大蒜的平均价格是多少元?( 2)该公司可将大蒜加工成蒜粉或蒜片,若单独加工成蒜粉,每天可加工8 吨大蒜,每吨大蒜获利 1000 元;若单独加工成蒜片,每天可加工12 吨大蒜,每吨大蒜获利600 元 . 为出口需要,所有采购的大蒜必须在30 天内加工完毕,且加工蒜粉的大蒜数量不少于加工蒜片的大蒜数量的一半. 为获得最大利润,应将多少吨大蒜加工成蒜粉?最大利润为多少?226.(本题满分 10 分)在平面直角坐标系xOy 中,抛物线y= mx +6mx+n( m> 0)与x 轴交于 A,B 两点(点 A 在点 B 左侧),顶点为 C,抛物线与y 轴交于点 D ,直线 BC 交 y 轴于 E,且△ ABC 与△ AEC 这两个三角形的面积之比为2∶ 3.( 1)求点 A 的坐标;( 2)将△ACO 绕点 C 顺时针旋转一定角度后,点 A 与求抛物线的解析式.B 重合,此时点O 恰好也在y 轴上,27.(本题满分 10 分)已知,如图,在边长为10 的菱形 ABCD 中, cos∠ B=3,点 E 为 BC 10边上的中点,点 F 为边 AB 边上一点,连接EF,过点 B 作 EF 的对称点 B’,( 1)在图( 1)中,用无刻度的直尺和圆规作出点B’(不写作法,保留痕迹);( 2)当△EFB ’为等腰三角形时,求折痕EF 的长度.(3)当 B’落在 AD 边的中垂线上时,求BF 的长度.A D A D A DF F FB EC B E C B EC图 1备用图备用图28.(本题满分 10 分)【缘起】苏教版九下56,“如图1,在Rt△中,∠=90°,CDP ABC ACB是△ ABC 的高,则△ ACD 与△ CBD 相似吗?”于是,学生甲发现CD2=AD ·BD 也成立.问题 1:请你证明 CD 2=AD ·BD ;CA D B图 1学生乙从CD2=AD ·BD 中得出:可以画出两条已知线段的比例中项.问题 2:已知两条线段AB 、BC 在 x 轴上,如图 2:请你用直尺(无刻度)和圆规作出这两条线段的比例中项.要求保留作图痕迹,不要写作法,最后指出所要作的线段.yA O ( B)Cx图 2学生丙也从 CD 2=AD·BD 中悟出了矩形与正方形的等积作法.问题 3:如图 3,已知矩形 ABCD ,请你用直尺(无刻度)和圆规作出一个正方形BMNP ,使得 S 正方形BMNP =S 矩形ABCD.要求:保留作图痕迹;简要写出作图每个步骤的要点.D CA B图3参考答案与评分标准一、 :1.D 2. C 3. A 4. B 5. D 6. B 7. A 8. D 9. A 10. C二、填空 :11 .1.1× 10412. a(b+3)(b-3) 13. x =- 214.1015 .30π 16.144617. 4118. 6三、解答 :19 .解:( 1)原式=3- 4 - 23 ⋯⋯( 3 分)(2)原式= 4x 2-4x + 1+( x 2- 4)=34 3( 4 分)= 4x 2- 4x +1+x 2- 4 ⋯( 3 分)- 63= 5x 2- 4x-3.⋯⋯( 4 分)20 .解:( 1) 1=2( x-3)-x⋯( 2 分)( 2)第 1 个不等式解得: x ≥ 1∴ x=7 ⋯( 3 分)第 1 个不等式解得: x < 4⋯( 2 分)x=7 是原方程的解.⋯( 4 分)∴原不等式 的解集 1≤ x <4 ⋯( 4 分)21 .( 1)略⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(4 分)( 2) 2 ⋯⋯⋯⋯⋯⋯⋯⋯⋯( 6 分)22 .( 1) 120⋯⋯( 2 分)( 2) 略, C :40; D : 12每个 1 分( 4 分)( 3) 750×4824= 450(份).⋯⋯⋯⋯⋯( 6分)120123 .解:(1)画 状 或列表略⋯⋯⋯⋯( 6 分)画 状 或列表正确,得5 分, 正( 2)125确 1 分⋯⋯⋯⋯⋯( 8 分)524. 解析: ( 1) 明: 接 OD ,∵ OB=OD , ∴∠ B=∠ ODB ,⋯⋯⋯⋯⋯( 1 分)∵ AB=AC , ∴ ∠ B= ∠ C , ∴ ∠ ODB= ∠ C , ∴ OD ∥ AC , ⋯⋯⋯⋯⋯⋯( 2 分)∵ DF ⊥ AC , ∴ OD ⊥ DF , ⋯⋯⋯( 3 分)∴ DF 是⊙ O 的切 ;⋯⋯⋯(( 2)解: 接BE , ∵ AB 是直径,∴∠ AEB=90°,⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(4 分)5 分)∵ AB=AC , AC=3AE ,∴ AB=3AE , CE=4AE , 22∴ BE= AB -AE =2 2 AE , ⋯⋯⋯( 6 分)BE 2 2AE2在 Rt △ BEC 中, tanC=AE = 4AE = 225.解:( 1) 去年每吨大蒜的平均价格是⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯( x 元,8 分)由 意得,4000002600000⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(2 分)x 500x 500解得: x =3500, ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ (3 分): x =3500 是原分式方程的解,且符合 意,⋯⋯⋯⋯⋯⋯⋯⋯⋯(4 分)答:去年每吨大蒜的平均价格是 3500 元;⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(5 分)( 2)由( 1)得,今年的大蒜数 : 40000040003 300(吨)⋯⋯⋯⋯(6 分)将 m 吨大蒜加工成蒜粉, 将( 300 m )吨加工成蒜片,由 意得,⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(7 分)解得: 100≤m ≤120, ⋯⋯⋯⋯⋯⋯⋯⋯( 8 分)利 : 1000 +600(300)=400+180000,⋯⋯⋯⋯⋯⋯⋯⋯⋯(9 分)mm m当 m =120 ,利 最大, 228000 元. 答: 将120 吨大蒜加工成蒜粉,最大利 228000 元. ⋯⋯⋯(10 分)26.解:( 1)抛物 y =mx 2 +6mx + n (m > 0),得到 称 x=-2,⋯⋯⋯( 1 分)①当 S △ ABC : S △AEC =2∶ 3 , BC : CE=2: 3,∴ CB : BE=2:1∵ OF=3,∴ OB=1,即 B (- 1, 0)∴ A(-5, 0), B(- 1, 0), ⋯⋯( 2 分)②当 S △ABC : S △AEC =3∶ 2 , BC :CE=3 : 2,∴ CD : BD =2: 1∴ A(-15, 0), B( 3, 0), ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(3 分)22( 2)①当 A(- 5, 0),B(-1, 0) ,把 B(- 1, 0)代人 y = mx 2得, n=5m ⋯⋯⋯⋯⋯⋯⋯⋯⋯(3 分)+6mx + n m =6 , n= 546 . ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(5 分)4∴ y =6 x 2+ 3 6 x+ 5 6 . ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯( 6 分)4 2 4②当 A(-15 , 0), B(3, 0) ,22把 B( 3,0)代人 y = mx 2+6mx + n 得, n= -45m ⋯⋯⋯⋯⋯⋯(7 分)24m =2 5, n=-55 .⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(9 分)276∴ y =2 5x 2+ 4 5 x -5 5.⋯⋯⋯⋯⋯⋯⋯( 10 分)279627.解:( 1)尺 作 略.⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(2 分)( 2)① 当 B ’E=EF , EF=5,⋯⋯⋯⋯⋯( 3 分)②当 B ’E=B ’F , EF= 35 ,⋯⋯⋯⋯⋯( 4 分) ③当 EF=B ’F , EF=25⋯⋯⋯⋯⋯( 5 分)3上: EF=5,35 , 25⋯⋯⋯⋯⋯( 6 分)3(3) 2 91 - 12⋯⋯⋯⋯⋯( 10 分)y5D28.解:( 1)明略⋯⋯⋯( 2 分)( 2) CD所要画的段⋯⋯⋯( 4 分)( 3)①延 AB 至 E,使得 BE=BC;A O (B) C x②以 AE 直径,画半 O,与 BC 的延相交于M图 2③以 BM 做正方形 BMNP⋯⋯⋯⋯⋯( 7 分)N MD C⋯⋯⋯⋯⋯( 10 分)AP O B E。

2018届 江苏无锡 初三英语一模 分类汇编 (任务型) (含答案)

2018届 江苏无锡 初三英语一模 分类汇编 (任务型) (含答案)

2018届江苏无锡初三英语一模分类汇编-----任务型丁蜀学区Whether we are going to school or going to work, we are all sad to leave the weekend behind and go back to our Monday morning blues. But with the tips, you can get over those blues and face Monday mornings with a smile.Do what gives you feelings of comfort, while remembering your responsibilities for the day. This will help you cheer yourself up for the day ahead. If the clock rings and you still feel sleepy, stay in for five minutes. However, don't stay past five minutes, as it will only make you feel even lazier for your day. When you get up, make a cup of coffee and put on some music. This will help you feel energetic.Try to give yourself a little something extra. Rewarding yourself for Monday would be a treat you wouldn't have the rest of the week. On Fridays, plan a night out for films or dinner. This will give you a little break from the rest of the week. This way, you will know that even if you're working hard, you will have something good waiting for you at the end of the week.On Sunday night, go to bed early. Your mind will react (反应) quickly on Monday morning. If you wake up early, you will have more time to get ready for the day. Being stressed during Monday mornings is only going to add to your blues.Follow these simple tips and you will be able to beat those Monday morning blues soon.54.55. 56. 57. 58.__________港下The word ‘OK’ celebrates 179th birthdayUsually, you don’t find the same words in different languages. But there is an exception for the word “OK”!People saw the word OK for the first time in the Boston Morning Post on March 23, 1839. It was an abbreviation (缩写) of the phrase “all korrect”, an incorrect spelling of “all correct”. Although it began as a joke, people later used the phrase on documents (文件) or through telegraphs (电报) to say that all was well.This year, OK celebrated its 177th birthday. We use this expression countless times every day. “How about two o’clock? OK?” “OK.” “OK then.” The word OK is easy to say, write and understand.Besides, it is more neutral (中立的) than many words. Allen Metcalf, American author of OK: The Improbable Story of America’s Greatest Word, told The Times, “What OK provided that other words did not was neutrality, a way to express agreement without having to offer an opinion.” For example, if someone asks you to go for a walk a fter lunch, you can simply respond, “OK”. There you go – no extra opinions.OK can be spelled in different ways: okay or O.K,but people read these three in the same way.‘OK’ is the most popular spelling and is often used in writing.Some people, however, l ike the spelling “okay” because it looks more like a word.Sometimes, people also say short forms of OK like “K”. For example, someone might say, “I’m just going to the supermarket, but I’ll be back in 10 minutes.” You could reply with, “K”.OK is so usefu l that it’s said worldwide. You may not know the language of someone you’re talking with, but saying “OK” with gestures (手势) can help you communicate.省锡中Enriching(使丰富) your life means making an effort to make your life as meaningful and happy as possible. Though you may have difficulty realizing it, there are endless steps you can take to experience new things, gain knowledge, and enjoy what you already have.Learn to forgive others. If yo u often hate other people around you, then you won’t live a wonderful life. So learn to move forward and accept nobody is perfect and that everyone makes mistakes. If someone has really hurt you and feel it difficult to accept that person’s apology(道歉), th en be honest about it. Don’t pretend(假装) that you’re okay and then go on complaining. This won’t get you very far.Volunteer to help others. It will not only be good for the people around you, but also make you able to connect with different people who can influence your life just as positively(积极地) as you can influence theirs. You can work in a homeless shelter or help do the cleaning in your neighbourhood.Try to be less wasteful. Trying to be not wasteful can help you become thankful and really enjoy the world around you more. You can use paper instead of plastic whenever you can. Don’t use too many products that can’t be used again. Go to somewhere on foot or by bike instead of driving. All these ideas make you less wasteful.Get along well with your friends and family. No matter how busy you are, you should develop a habit of spending time with your loved ones and letting them know how much they mean to you. You can write thank-you cards to your friends and family members or call up your parents or grandparents regularly. If you’re not living in the same place, then often tell yourself to call just to say “hi”.天一Some people believe that greed(贪婪) and selfishness has become the main theme of modernsociety, and we should return to the old traditions of family and community in order to have a better life.In this fast –paced(快节奏的) world, many values are experiencing great changes. While people traditionally caring, sharing and generosity the most important things in life and work, modern people seem to be more self-centered.Modern people act selfishly to survive the highly competitive world. To survive, you have to fight with whatever ways you can think of. Obviously greed and selfishness go perfectly well with such ideas. In a company, workers do everything they can to get better pay and higher position, even if it means their workmates will lose a lot because of this. They are not born cold-blooded; it is just that people are pressured to act in a certain way because of outside influences.To be honest, it is hard to say that modern society is built on greed and selfishness, both of which are not newly invented vocabulary. In ancient times people also did greedy and selfish things though such behaviors were more seriously punished then. But we can’t be blind to the fact that people in the past faced less pressure compared with the modern environment.Are we happier to share with others and be generous to them? There is no fixed answer either. Some people take great pleasure helping and giving to others while others feel happy doing the opposite. But I personally think that people should not be too selfish. Caring for others can actually encourage the development of a win-win relationship.参考答案丁蜀学区:54.what 55.energy 56.reward 57.through 58.stress港下:1.appeared 2.meaning 3.change 4.beginning 5.agreement.省锡中:experiences dishonest How Avoid/ Stop relationships 天一:1. Values 2. place 3. loss(es) 4. Reasons 5. developed / built。

无锡省锡中2017~2018学年度初三中考一模数学试卷(含答案)

无锡省锡中2017~2018学年度初三中考一模数学试卷(含答案)

无锡省锡中2017~2018学年度初三中考一模数学试卷2018.3考试说明:满分130分,考试时间120分钟.一、选择题(本大题共10小题,每小题3分,共30分.在每小题所给出的四个选项中,只有一项是正确的,请把正确的选项填在相应的括号内) 1.﹣2的绝对值是A .2B .﹣2C .12D .12- 2.下列运算正确的是A .236a a a ⋅=B .33a a a ÷=C .32422a a a -=D .326()a a = 3.下面四个手机应用图标中是轴对称图形的是A B C D4.如果一个多边形的内角和等于1440°,那么这个多边形的边数为 A .8 B .9 C .10 D .11 5.若圆柱的底面半径为3,母线长为5,则这个圆柱的侧面积为A .15B .12πC .15πD .30π 6则这些队员年龄的众数和中位数分别是A .15,15B .15,15.5C .15,16D .16,157.如图,AB 是⊙O 的直径,CD 是⊙O 的弦,连结AC 、AD 、BD ,若∠BAC =35°,则∠ADC 的度数为 A .35° B .65° C .55° D .70°第7题 第8题 第9题8.如图,在菱形ABCD 中,AC 、BD 相交于点O ,E 为AB 的中点,且DE ⊥AB ,若AC =6,则DE 的长为A .3B .C .D .49.如图,矩形ABCD 的顶点A 和对称中心在反比例函数(0ky k x=≠,0)x >上,若矩形ABCD 的面积为8,则k 的值为A .8B .C .D .410.如图,点A 是直线y =﹣x 上的动点,点B 是x 轴上的动点,若AB =2,则△AOB 面积的最大值为A .2B 1C 1D . 第10题二、填空题(本大题共8小题,每小题2分,本大题共16分.不需要写出解答过程,只需把答案直接填写在相应的横线上) 11.因式分解:39a a -= .12.据统计,2018无锡市春节黄金周共接待游客约3020000人次,这个数据用科学记数法可表示为 .13.函数y =中自变量x 的取值范围是 . 14.分式方程213x x =-的解是 . 15.如图,在△ABC 中,∠ABC =90°,∠C =25°,DE 是边AC 的垂直平分线,连结AE ,则∠BAE 等于 .第15题 第16题 第17题16.如图,四边形ABCD 是平行四边形,其中边AD 是⊙O 的直径,BC 与⊙O 相切于点B ,若⊙O 的周长是12π,则四边形ABCD 的面积为 .17.在如图所示的正方形方格纸中,每个小的四边形都是相等的正方形,A 、B 、C 、D 都是格点,AB 与CD 相交于M ,则AM :BM = .18.在平面直角坐标系中,已知A 、B 、C 、D 四点的坐标依次为(0,0)、(6,2)、(8,8)、(2,6),若一次函数62(0)y mx m m =-+≠的图像将四边形ABCD 的面积分成1:3两部分,则m 的值为 .三、解答题(本大题共10小题,共84分.请在试卷相应的区域内作答,解答时应写出文字说明、证明过程或演算步骤) 19.(本题满分8分)(1)计算:2018(1)2sin 45-+-︒;(2)化简:2(2)(2)(2)x x x --+-.20.(本题满分8分)(1)解不等式组:1253(1)x x x +>⎧⎨+≥-⎩;(2)解方程:2210x x --=.21.(本题满分8分)已知:如图,AB ∥ED ,点F 、C 在AD 上,AB =DE ,AF =DC ,求证:BC =EF .22.(本题满分8分)省锡中实验学校为了解九年级学生的身体素质测试情况,随机抽取了该市九年级部分学生的身体素质测试成绩作为样本,按A(优秀),B(良好),C(合格),D(不合格)四个等级进行统计,并将统计结果绘制了下面两幅不完整的统计图,请根据图中提供的信息,解答下列问题:(1)此次共调查了多少名学生; (2)将条形统计图补充完整,并计算扇形统计图中“A ”部分所对应的圆心角的度数; (3)该市九年级共有1000名学生参加了身体素质测试,估计测试成绩在良好以上(含良好)的人数.23.(本题满分8分)车辆经过江阴大桥收费站时,4个收费通道A 、B 、C 、D 中,可随机选择其中的一个通过.(1)一辆车经过此收费站时,选择A 通道通过的概率是 ;(2)求两辆车经过此收费站时,选择不同通道通过的概率(请用树状图或列表法等方式给出分析过程).。

2018届江苏无锡初三英语一模分类汇编(单选)(含答案)

2018届江苏无锡初三英语一模分类汇编(单选)(含答案)

2018 届 江苏无锡 初三英语一模 分类汇编单选丁蜀学区1. Simon and Daniel are brothers. There is ____ uncommon similarity between _______ two boys.A. an; /B. an; theC. a; /D. a; the2. None of them talked. They finished their meals in ______ . A. silenceB. orderC. placeD. public3. ---I can 't find the magazine I bought this morning.---Well, Jack is reading _______ over there. Why not go and see if it is yours? A. itB. thatC. oneD. some4. Tony ' s mum looks young and beautiful. It ' s hard to imagine she is already in her _______5. ---As a nurse, her work goes _____ taking care of her patients.---Yes, she always thinks of others.6. The coach thinks ____ of Mary ' s ports talents, for she jumped very ________ at the sportsflood large areas, but now the waters of it are used to _________________energy.A. was used to ; producingB. used to ; producingC. was used to ; produceD. used to ; produce8. Don ' t throw away the waste paper. It requires _____ so that it can be reused. A. to protect B. protecting C. to collect D. collecting9. On those foggy days, you could hardly see anything around you ____ it was at noon. A. so B. because C. but D. though10. ---Don ' t forget to come to our school assembly 集会)tomorrow morning.---I won ' t. I ______ just now.A. fiftiesB. fiftyC. fiftiethsD. fiftiethA. beyondB. besideC. behindD. betweenmeeting. A. high ; highB. highly ; highlyC. high ;D. highly ; high7. The Yellow River11. ---I think we need to sit down and have a talk.A. couldB. couldn ' tC. should 12. ---I think the plan is just a waste of time. What do you think?14. --- Reading is a good way to pass the time on the plane.__________ . I never go travelling without a book.(港下)1. According to the report, most students in the UK take ___________ active part in ___________ after-school activities. A. /; the B. an;/ C. /;/ D. an; the2. What ____ be done at any time will be done at no time.A. mustB. needC. mayD. should3. Fans all over the country are talking about _____ this football team has never won any match and ______ to do with it. A. whether ;howB. why; howC. whether; whatD. why; what4. --Catherine 's father ,who is the general manager of a company , is said to be very rich. -- ________ She would rather work for others than accept his help. A.What for? B. So whatC. No doubtD. No wonder5. The little girl was found ____ in her bedroom after she had an argument ( 争论 ) with her best friend.A. cryingB. to cryC. being cryingD. cried6. --Do you think Florida a good place to have a holiday?--Yes, I have just spent a holiday there and would ______ it to everyone. A. explain B. recommend C. provideD. pass7. The happiest of people don' t necessarily have the best of everything; they just make the most ofA. remindedB. was remindedC. reportedD. was reported---I _____ agree more. Lets take the bench over there.D. shouldn ' t--- Well, if you dontsupport A. neither do I B. so do I C. neither will I D. so will I13. Hi, Jim. I hear that youve just come back from Sanya. Im calling to askA. how did you visit the cityB. how many days you' ve spent thereC. which hotel you stayed in SanyaD. how you found the seafood thereA. You are joking. C. Idon ' t think soB. That ' s true D. It sounds like funeverything ______ comes along their way.8. -- I haven ' t seen Tom for a.gAensy news about him?-- He ______ in a toy factory for two years. Now he is a farmer.A. workedB. has workedC. was workingD.would work9. --How is everything going on with you?--Quite well. Not so smoothly as I hope _____ .A. thoughB. insteadC. eitherD. since10. Edward was excited that his wife _____ his children ______ invited to the party with him.A. and;wasB. together; wereC.as well as; wasD. along with; were11. --I have finished all my exercises .-- Oh,really? ______ .Let 's go home now.A. So have IB. So I haveC. So do ID. So I do12. We had to be patient, because it ______ some time _______ we got the result.A. would be;beforeB. was; afterC. has been;sinceD.had been; until13. -Tom,I am sorry that I can ' t go out with you today, for I have to do my homework. -- . Have some fun.A. Don' t have too many irons in the fireB. Don' t be a wet blanke毛毯).C. God helps those who help themselvesD . A slow sparrow should make an early start.14. --Excuse me, could you tell me where I could make a call?--Sorry, I ' m a stranger here.A. Thanks a lotB. Thanks anywayC. That's a pityD. I ' m sorry to hear that省锡中21. Zhou Huaiming was ___ artist who was good at drawing grapes in ____ 1940s in Wuxi.A. a; theB. an; theC. the;/ D. the; the22. --- I can ' t find the nolvIebought yesterday.--- Look, John is reading ___ __ over there. You ' d better go and see if it is yours.A. itB. someC. oneD. that23. --- Compare the articles written by the students from different schools, and you ' ll find Jack ' s is--- Sure. That ' s why we voted for him.A. the most boringB. more boringC. more interestingD. the most interesting24. Frank and his friend gave each other their addresses and promised to __ each other.A. get on well withB. connect withC. keep in touch withD. come up with25. While Cindy was in Paris, she developed a ____ for fine art.A. wayB. tasteC. relationD. habitA. whichB. whoC. whenD. that_____ you ' ve trieodn,ityou can ' t imagine how pleasant the journey to Shanghai is.A. ThoughB. UnlessC. HoweverD. IfDon ' t leave the tap running. Water needs ______ so that it can be used by more people.26. 27. 28.29.30. 31.32.33.34.天一 1.2.3. 4.5.A. to saveB. to saved --- You ____ be excited that you--- Yes, I can ' t wait for it. A.should B.. canC. to be safeD. saving ' re going to get the award.C. mustD. needAll of us should be aware that this type of energy will ____ if we continue to waste it. A. take out B. break out C. put out D. run out--- Learning a language isn--- I agree. ______ . There A. All roads lead to Rome. t easy. It takes time. 's no short cut.B. Rome wasn ' t built in a day.C. Practice makes perfect.D. Slow but sure wins the race.______ is it from your flat to the city centre? --- About 15 minutes ' walk. A. How longB. How muchC. How farD. How manyHi, Simon. I hear that you ve just comemcalling A. how did you visit the cityC. which hotel you stayed in Korea Many women spend _________ money on ChinaB. how many days you ' ve spent there D. how you found the popular local food ' s -bciogmgemset rece website, Taobao.A. a great deal ofB. a large number ofC. large numbers of --- I visited the Reed Flute Cave in Guilin last weekend.D. a huge army of______ . Why didn ' t you tell me earlier?A. You did?B. I hope so.C. Have a good time.D. That ' s all right. Life is like _____ ocean. Only _____ strong-willed can reach the other side.A. a; /B. the; aC. an; theD. /; a— _________ is it from your home to the nearest supermarket?— Nearest? Let me see. About five minutes' ride.A. How longB. How farC. How oftenD. How soonPut such dangerous things as medicine, knives and lights _______ the reach of children. A. in B. within C. beyondD. over— Does your mother have any hobbies? — No, ________ you call watching TV a hobby.A. ifB. unlessC. untilD. whenYou _____ pay too much attention to your pronunciation, as it is so important in the oral test.A. shouldn ' tB. mustn 'tC. can 'tD. needn 't6. —Do you drink much coffee as before?—No, _________ at all. My sleeping problem is getting worse.A. LittleB. noneC. nothingD. anything7. —All right. I ak'e itll. tBut I tell you, it is the last time I will _____ this kind of work.—Come on, Buddy! Don ' t be so serious.A. take offB. take onC. take outD. take up8. —There is something wrong with my new shower. I ' ll return it to the shop tomorrow.—How come? Are you sure you put it in ________ ?A. carefullyB. peacefullyC. wiselyD. properly9. —What do you think of your school, Linda?—It ' s a good place for us to _________ ourselves for the future.A. promiseB. prepareC. proveD. present10. You should go to see him since he is so seriously ill. ________ , he is your brother.A. In allB. First of allC. Above allD. After all11. Over these years, I have had a new understanding of __________ people traditionally call aperfect person.A. howB. whatC. whoD. whom12. —The novel Gulliver ' s Travels is very nice.—So it is. Could you tell me __________ ?A. how long can I borrow itB. that I can borrow itC. if I can keep it for another weekD. when should I return it13. —I may find a better job if I go abroad.—Don' t be silly. _________ , you know.A. Don ' t put all eggs in one basketB. Don ' t burn the candle at both ends.C. Actions speak louder than wordsD. The grass is always greener on the other side14. —John, when will you pay a visit to that place of interest?—I can ' t decide at present. ____________A. It just depends.B. It ' s up to you.。

精选江苏省无锡市2017届九年级英语下学期第一次模拟试题

精选江苏省无锡市2017届九年级英语下学期第一次模拟试题

江苏省无锡市2017届九年级英语下学期第一次模拟试题第I卷(客观题共70分)一、听力测试(共20分,每小题1分)第一部分听对话回答问题,本部分共有10道小题,每小题你将听到一段对话,每段对话听2遍。

在听每段对话前你将有5秒钟的时间阅读题目,听完后,你还将有5秒钟的时间选择你认为最合适的备选答案,在听到“滴”的信号后,进入下一小题。

( )1. What are they talking about?A. B. C.( )2.Where is the man’s father?A. B. C.( ) 3. What is the man’s suggestion?A. B. C.( ) 4.What did the boy’s mum buy yesterday?A. B. C.( ) 5.Where is the woman from?A. Canada.B. America.C. Germany.( )6. What does the man mean?A. He did better than the woman.B. He was sure he did well.C. The girl got the first place.( )7. What kind of animals does Lisa like best?A. Monkeys.B. Dogs.C. Elephants.( )8. What month is it?A. January.B. February.C. December.( )9. What has the man done?A. He has done some washing.B. He has done some cleaning.C. He has done some cooking.( )10. What do we know about Bob?A. He’s a hard-working boy.B. He often does his homework with others’ help.C. He often forgets his homework.第二部分听对话和短文答题,你将听到一段对话和2篇短文,各听两遍。

江苏省无锡市新吴区2018年中考数学一模试卷及答案

江苏省无锡市新吴区2018年中考数学一模试卷及答案

2017—2018 学年度第二学期九年级期中测试数学试卷满分:130 分考试时间:120 分钟一、选择题(本大题共10 小题,每小题3 分,共30 分.在每小题所给出的四个选项中,只有一个是正确的,请将正确的选项编号填写在答.卷.纸.相.应.的.位.置.处.)1.﹣2 的倒数是………………………………………………………………………………(▲)A. 2B.12C. - 2D.12-2.二次根式1x-中,x 的取值范围是……………………………………………………(▲)A. x ≥1B. x >1C. x ≤1D. x <13.下列计算正确的是…………………………………………………………………………(▲)A.a2 +a3 =a5B.a2 ⋅a3 =a6C.(a2 )3 =a6D.(ab)2 =ab24.下列图形中,是轴对称图形的是…………………………………………………………(▲)A.B.C.D.5.抢微信红包成为节日期间人们最喜欢的活动之一,小明一家5 个人抢到的红包数据如下:4 ,5 ,10 ,6 ,10 .则这组数据的中位数和众数是……………………………(▲)A. 10,10B.7,8C. 6,10D. 8,56.在平面直角坐标系中,将抛物线y = (x +1)2 向右平移2 个单位,再向下平移4 个单位,得到的抛物线解析式是…………………………………………………………………………(▲)A.y = (x -2)2 -4 B.y = (x -1)2 -4 C.y = (x -2)2 -3 D.y = (x -1)2 -37.如图,点P 是反比例函数y=kx( x< 0) 图象上一点,过P 向x 轴作垂线,垂足为M,连接OP.若Rt△POM 的面积为2,则k 的值为…………………………………………………(▲)A.4B.2C.- 4D.- 28.如图,将四边形纸片ABCD 沿AE 向上折叠,使点B 落在DC 边上的点F 处.若△AFD 的周长为12,△ECF 的周长为3,四边形纸片ABCD 的周长为……………………………(▲)A.14 B.15 C.16 D.209.如图,在Rt△ABC 中,∠BAC=90°,D、E 分别是AB、BC 的中点,F 在CA 延长线上,∠FDA= ∠B,AC=3,AB=4,则四边形AEDF 的周长为…………………………………………(▲)A.8 B.9 C.10 D.11(第7 题)(第8 题)(第9 题)10.如图,以点G(0,1)为圆心,半径为2 的圆与x 轴交于A、B 两点,与y 轴交于C、D 两点,点E 为⊙G 上一动点,CF⊥AE 于F.当点E 从点B 出发顺时针运动到点D 时,点F 所经过的路径长为…………………………………………………………………………(▲)A.32πB.33πC.34πD.36π(第10 题)(第18 题)二、填空题(本大题共8 小题,每小题2 分,共16 分.不需写出解答过程,只需把答案填写在答.卷.纸.的.相.应.位.置.处.)11.9 的算术平方根是▲.12.分解因式:2a3 - 8a =▲ .13.据统计,2018 年无锡鼋头渚“樱花节”活动期间入园赏樱人数约803 万人次,用科学记数法可表示为▲人次.14.已知圆锥的底面圆半径为3,母线长为5,则圆锥的侧面积是▲ .15.关于x 的方程x2 + 5x +m = 0 的一个根为- 2 ,则另一个根是▲.16.已知一组数据:0,-1,7,1,x 的平均数为1,则这组数据的极差是▲ .17.不论a 取什么实数,点A(1 -a,3a - 4) 都在直线l 上,若B(m,n) 也是直线l 上的点,则3m +n =▲ .18.如图,在四边形ADBC 中,∠ACB=∠ADB=90°,AD=BD,AC=3,BC=4,则线段CD 的长等于▲.三、解答题(本大题共10 小题,共84 分.请在答卷纸上指定区域内作答,解答时应写出文字说明、证明过程或演算步骤)19.(本题满分8 分,每小题4 分)(1)计算100 1()2cos60(3) 6π----(2)化简:11x⋅-212xx--+1+2x20.(本题满分8 分,每小题4 分)(1)解方程:1277xx x-=--(2)解不等式组:2105132xx x+≥⎧⎪+⎨-⎪⎩f21.(本题满分6 分)央视热播节目“朗读者”激发了学生的阅读兴趣.某校为满足学生的阅读需求,欲购进一批学生喜欢的图书,学校组织学生会成员随机抽取部分学生进行问卷调查,被调查学生须从“文史类、社科类、小说类、生活类”中选择自己喜欢的一类,根据调查结果绘制了统计图(未完成),图2图1请根据图中信息,解答下列问题:(1)将图1 的条形统计图补充完整;(2)图2 中“小说类”所在扇形的圆心角为▲度;(3)若该校共有学生2500 人,估计该校喜欢“社科类”书籍的学生人数.22.(本题满分8 分) 为弘扬中华传统文化,新吴区近期举办了中小学生“国学经典大赛”.比赛项目为:A.唐诗;B.宋词;C.论语;D.三字经.比赛形式分“单人组”和“双人组”.(1)小丽参加“单人组”,她从中随机抽取一个比赛项目,恰好抽中“三字经”的概率是多少?(2)小红和小明组成一个小组参加“双人组”比赛,比赛规则是:同一小组的两名队员的比赛项目不能相同,且每人只能随机抽取一次,则恰好小红抽中“唐诗”且小明抽中“宋词”的概率是多少?请用画树状图或列表的方法进行说明.如图,已知矩形ABCD,AB=6,AD=10,请用直尺和圆规按下列步骤作图(不要求写作法,但要保留作图痕迹);(1)在BC 边上作出点E,使得cos ∠BAE =3 5(2)在(1)作出的图形中①在CD 上作出一点F,使得点D、E 关于AF 对称;②四边形AEFD 的面积= ▲ .24.(本题满分8 分)如图,AB 是⊙O 的直径,AD 是⊙O 的弦,点F⊙O 的切线交DF 于点E,CE⊥DF.(1)求证:AC 平分∠F AB;(2)若AE=1,CE=2,求⊙O 的半径.25.(本题满分8 分)定义:在△ABC 中,∠C=30°,我们把∠A 的对边与∠C 的对边的比叫做∠A 的邻弦,记作thi A,即thi A=A BCC AB∠=∠的对边的对边.请解答下列问题:已知:在△ABC 中,∠C=30°.(1)若∠A=thi A 的值;(2)若thi A=3,则∠A=▲;(3)若∠A 是锐角,探究thi A 与sin A 的数量关系.甲,乙两人同时各接受了300 个零件的加工任务,甲比乙每小时加工的数量多,两人同时开工,其中一人因机器故障停止加工若干小时后又继续按原速加工,直到他们完成任务。

无锡省锡中2017~2018学年度初三中考三模数学试卷(含答案)

无锡省锡中2017~2018学年度初三中考三模数学试卷(含答案)

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B.5
C.﹣3
D.3
1
10.如图,有两个全等的△ABC 与△DEF,∠C=∠E=90°,AC=DE=3,BC=EF=4,点
D 是 AB 中点,点 E 在 DA 延长线上,将△DEF 绕点 D 顺时针旋转角度 (0°≤
≤180°),在此过程中,两个三角形的重叠部分为等腰三角形的时刻有
A.5 个
(1)解方程: x2 6x 3 0 ;
(2)解不等式组:
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21.(本题满分 8 分) 已知:如图,△ABC 中,O 是 AC 中点,AD∥BC 交 BO 的延长线于点 D.求证:AD
=BC.
22.(本题满分 8 分) 设中学生体质健康综合评定成绩为 x 分,满分为 100 分,规定:85≤x≤100 为 A 级,
A.a+b>0
B.a﹣b>0
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6.已知 A 样本的数据如下:72,73,76,76,77,78,78,78,B 样本的数据恰好是 A 样
本数据每个都加 2,则 A,B 两个样本的下列统计量对应相同的是
A.平均数
B.方差
C.中位数
D.众数
7.将一把直尺和一块含 30°和 60°角的三角板 ABC 按如图所示的位置放置,如果∠CDE
75≤x<85 为 B 级,60≤x<75 为 C 级,x<60 为 D 级.现随机抽取福海中学部分学生的综 合评定成绩,整理绘制成如下两幅不完整的统计图,请根据图中的信息,解答下列问题:
(1)在这次调圆心角
等于 ▲ ;
(2)补全条形统计图; (3)若该校共有 3000 名学生,请你估计该校等级为 D 的学生有多少名?

2018年无锡市重点中学初三第一次联合测评物理试卷

2018年无锡市重点中学初三第一次联合测评物理试卷

2018年无锡市重点中学初三第一次联合测评物理试卷学校:__________ 姓名:__________ 班级:__________ 考号:__________一、单选题1.小明同学参加身体素质测试,部分数据记录如下,其中错误的是()A.握力为40kg B.肺活量为266mLC.跑步速度为5m/s D.体重为500N2.60kg的人站在跷跷板某一位置时,跷跷板处于如图所示的平衡状态.由此可估测球的质量约为 .................................................................................................................................... ()A.20kgB.30kgC.60kgD.120kg3.如图所示,车厢顶上有一个小球自由落下,落在地板上A处,由此可以判断车厢在()A.向右匀速运动B.向左匀速运动C.向右减速运动D.向左减速运动4.某同学坐在行驶的列车内,若说他是静止的,则所选择的参照物是()A.铁轨B.在车内走动的乘务员C.车窗D.路边的树5.一个能够自由转动的矩形线圈,悬挂在磁场中,通电后线圈不动,这可能是:()A.线圈中的电流方向接反了; B.线圈中通的是交流电;C.线圈此时正好处在“平衡位置”; D.以上讲法都不对.6.在“安全用电与保护”讨论交流中,下列防止发生事故或处理事故的措施不正确...的是 ............................................................................................................................................ ()A.雷雨天,应避免在高大建筑物和大树下避雨B.发现有人触电,不能用手直接拉动触电的人体,应该先切断电源C.电器设备失火,应迅速用水灭火D.有金属外壳的电器用三孔插座7.两个导体并联后的总电阻()A.比每个导体的电阻都大B.比每个导体的电阻都小C.等于两个导体的电阻之和D.等于两个导体电阻的倒数之和.8.田甜同学在家发现客厅白炽灯的发光比房间白炽灯的发光亮,对这种现象判断正确的是()A.客厅白炽灯灯丝的电流大B.客厅白炽灯灯丝的电阻大C.客厅白炽灯两端的电压大D.以上判断都有可能9.在“探究串联电路中的电流”实验中,某同学用电流表分别测出图中a、b、c三处的电流大小,并初步得到它们之间关系的结论.为了进一步探究它们之间的关系,下一步他的操作是()A.将电源两极对调,再次测量a、b、c三处的电流B.改变开关S的位置,再次测量a、b、c三处的电流C.将图中两只灯泡位置对调,再次测量a、b、c三处的电流D.换用不同规格的灯泡,再次测量a、b、c三处的电流10.下面的几种现象中,属于液化现象的是()A.在寒冷的冬天,冰冻的湿衣服会慢慢变干B.擦在皮肤上的酒精很快变干C.深秋时节,早晨会看到树枝上挂满了霜D.烧水时从壶嘴喷出“白气”11.物体通过凸透镜可以在光屏上形成倒立放大的实像,下列哪个光学仪器应用了这种成像原理 ........................................................................................................................................... ()A.照相机B.放大镜C.幻灯机D.汽车后视镜12.下列现象能用光沿直线传播规律解释的是()A.观赏水中的鱼B.用冰凸透镜取火C.在树阴下躲太阳D.雨后天空出现彩虹13.超声波是人耳听不见的声音,它有着广泛的应用。

2017-2018学年无锡市初中中考英语模拟试卷及答案(word版)

2017-2018学年无锡市初中中考英语模拟试卷及答案(word版)

初三英语第一次模拟试卷2018. 4一、单项选择1.Life is like______ ocean. Only_______ strong--willed can reach the other side.A.a:/ B.the;a C.an; the D:/:a2.---__________is it from your home to the nearest supermarket?---Nearest?Let me see.About five minutes’ ride.A.How longB.How farC.How oftenD.How soon3.Put such dangerous things as medicine,knives and lights________the reach of children.A.inB.withinC.beyondD.over4.---Does your mother have any hobbies?---No,__________you call watching TV a hobby.A.ifB.unlessC.untilD.when5.You _____pay too much attention to your pronunciation, as it is so important in the oral test.A.shouldn’tB. mustn’tC.can’tD.needn’t6.----Do you drink much coffee as before?----No,_______ at all.My sleeping problem is getting worse.A.littleB.noneC.nothingD.anything7.---All right.I’ll take it.But I tell you,it is the last time I will_______this kind of work.----Come on,Buddy!Don’t be so serious.A.take offB.take onC.take outD.take up8.---There is something wrong with my new shower.I’ll return it to the shop tomorrow.---How come?Are you sure you put it in ________?A.carefullyB.peacefullyC.wiselyD.properly9.---What do you think of your school,Linda?---It’s a good place for us to ________ ourselves for the future.A.promiseB.prepareC.proveD.present10.You should go to see him since he is so seriously ill.__________, he is your brother.A.In allB.First of allC.Above allD.After all11.Over these years,I have had a new understanding of _______ people traditionally call a perfect person.A.howB.whatC.whoD.whom12.---The novel Gulliver’s Travels is very nice.---So it is.Could you tell me ________?A.how long can I borrow itB.that I can borrow itC.if I can keep it for another weekD.when should I return it13.---I may find a better job if I go abroad.---Don’t be silly.________,you know.A.Don’t put all eggs in one basketB.Don’t burn the candle at both endsC.Actions speak louder than wordsD.The grass is always greener on the other side14.---John,when will you pay a visit to that place of interest?---I can’t decide at present._____________A.It just depends.B.It’s up to you.C.What a good idea!D.Take your time.二、完型填空I looked the word “successful”in my dictionary and some of the words listed were:happy,fortunate,and hard-working.If that’s the definitionof “successful”,then I’m truly successful after____15______.I started dabbling(涉足)in the Internet marketing in October 2010.It didn’t take long for me to become a ______16____of the“become-a-millionaire-overnight”thought that twas so popular on the internet.I had supposed that selling things on the Internet was so easy that even beginners could start making money on the very ____17___ day.I spent most of my time advertising rather than learning _____18____to advertise.However,half a year’s hard work led to no money at all.In June,I found a programme that was___19___,and I began to learn from it.It wasn’t long before I gave___20___the “get-rich-quick” mind.Ibegan to ____21____that the Internet sale is a job like any other job and I would have to take it ___22____. I kept trying to cheer myself up, which I thought was the key to success in sales. I insisted on the excellent Internet marketing and then good _____23__ came. My dabbling became a hobby, and then passion (热情). Later passion ___24____ my business. I have really become a millionaire within a year.The more I learn, the more I realize I need to learn more. I’ve made a lot of mistakes, but I know that every mistake is just one more forward, as a song tells us “you’ve got to lose to know how to win.”15. A.failure B.danger C.course D.warning16. A.lover B.victim C.hater D.supporter17. A.next B. last C. first D. second18. A.how B.what C.when D.where19. A.helpless B.valuable fortable D. meaningless20. A. out B. away C. up D. in21. A. complain B. imagine C. wonder D. realize22. A. quietly B. seriously C. slightly D. heavily23. A. luck B. matter C. place D. event24. A. organized B. described C. corrected D. encouraged三、阅读理解A25.Which languages can Galia speak?a.Englishb.Frenchc.Chinesed.RussianA. a and bB.a,b and cC.a and cD.b,c and d26.Galia is probably ___________.A.confidentB.helplesszyD.kind-hearted27.How can Galia be contacted?A.By calling at 0111 168 12345B.By visiting her officeC.By sending emails to her teachersD.By sending a letter to her home28.How many traffic accidents did food deliverymen in Shanghai cause in the first half of 2017?A.38B.76C.153D.2,00029.The companies will fine them if a good delivery man__________.A.gets bad viewsB.obeys traffic rulesC.drives too slowlyD.delivers food on time30.What’s the main idea of the last paragraph?panies are improving their review systemsB.Some cities are working to improve the situationC.To drive safely,food deliverymen will obey more traffic rulesD.Food deliverymen cannot drive on important roads in the futureDMany people believe the glare from snow causes snow blindness. Yet, with dark glasses or not, they find themselves suffering from headaches and watering eyes, and even snow blindness when exposed to several hours of snow light.The United States army has now determined that glare from snow does not cause snow blindness in troops in a snow-covered country. Rather, a man’s eyes often find nothing to focus on in a broad space of snow-covered land. So his gaze continually moves and jumps back and forth over the entire landscape in search of something to look at. Finding something, hour after hour, the eyes never stop searching and the eyeballs become tired and the eye muscles ache. Nature makes up for this discomfort by producing more and more fluid (液体) which covers the eyeball. The fluid covers the eyeball in increasing quantity until it makes eyes difficult to see clearly, and the result is total, even though for a short time, snow blindness.Experiments led the army to a simple method of overcoming this problem. Scouts (侦察员) ahead of the troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-covered landscape. Even the scouts themselves throw lightweight, dark-colored objects ahead on which they can focus too. The men following can then see something. Their eyes focus on a bush and having found something to look at, stop searching the snow-blanketed landscape. By focusing their attention on one object at a time, the men can cross the snow without becoming hopelessly snow-blind or lost. In this way the problem of crossing a continuous white land is overcome.34.What is the first paragraph mainly about?A.The whiteness from snow.B.Snow light and snow blindnessC.The need for dark glassesD.Headaches and watering eyes35.Snow-blindness can be avoided___________.A.by covering the eyeballs withe more and more tearsB.by walking ahead and keep looking aroundC.by making up for the discomfort of one’s eyesD.by providing the eyes with something to focus on36. What is the best title for this passage?A.Snow-blindness:what it is and whom it influenceB.Snow-blindness:what it is and how nature helpsC.Snow-blindness:how it forms and how to solve itD.Snow-blindness:how it forms and whom it hurts37. Which of the following can be inferred from the passage?A.Solving the problem of snow-blindness is important in armyB.Snow-blindness was once a big problem but could be cured easilyC.The glare from snow is considered as the main cause of snow-blindnessD.Armies around the world pay attention to the problems ofsnow-blindness四、词汇运用1.More and more people use __________(电子的)instead of cash now.2.The government has done a lot to prevent this kind of disease frombeing ________(传播).3.The man of medium height was charged with __________(偷) a valuablenecklace the other day.4.I’m sorry you are _______(完全)wrong.You’ve mistaken Lucy for Lily.5.It won’t be easy to reach an ________(agree) with their company,butwe have to try our best.6.The fish will be much _________(taste) if you put some sugar in it.7.There is an old saying, “___________(proud) goes before a fall”.8.It was a great pity that the old man’s _________(serve) to themountain area were never known by people.五、动词填空1.He didn’t even mention the difficulty he had at thattime_________(control)the moving train.2.So far,not only the highways but also therailway___________(connect)the two cities.3.---How was your flight to Hainan?---Couldn’t be worse.We__________(keep) at the airport for five hours.4.If I ________(take) a rest when he comes,please ask him to wait fora while in my office.5.What a great pity it is_________(hear) that so many famous Brazilianfootballers died in the air crash on November 28,2016.6.Nothing else________(appear)on the screen until I click onit.Look,I’m clicking now.7.---Why were the whole family away from Wuxi last week?---Well,the mother,as well as her sons,__________(try)out for the singing program.8.I’m sure the bag my cousin bought in Shanghai__________(wash) easily.六、任务型阅读Some people believe that greed(贪婪) and selfishness has become the main theme of modern society and we should return to the old traditions of family and community in order to have a better life.In this fast-paced(快节奏的)world,many values are experiencing great changes.While people traditionally caring,sharing and generosity the most important things in life and work,modern people seem to be more self-centered.Modern people act selfishly to survive the highly competitive world.To survive,you have to fight with whatever ways you can think of.Obviously greed and selfishness go perfectly well with such ideas.In a company,workers do everything they can to get better pay and higher position,even if it means their workmates will lose a lot because of this.They are not born cold-blooded;it is just that people are pressured to act in a certain way because of outside influences.To be honest,it is hard to say that modern society is build on greedand selfishness,both of which are not newly invented vocabulary.In ancient times people also did greedy and selfish things that people in the past faced less pressure compared with the modern environment.Are we happier to share with others and be generous to them?There is no fixed answer either.Some people great pleasure helping and giving to others while others fell happy doing the opposite.But I personally think that people should not be too selfish.Caring for others can actually encourage the development of a win-win relationship.七、完成句子1.若干年后,他真后悔一开始没有采纳他爸爸的建议。

江苏省无锡市新安中学2017届九年级英语上学期第一次学业质量检测试题牛津译林版

江苏省无锡市新安中学2017届九年级英语上学期第一次学业质量检测试题牛津译林版

江苏省无锡市新安中学2017届九年级英语上学期第一次学业质量检测试题一、选择填空(16分)()1. ―The English test is rather hard.―Yes, it’s said tha t _____ of us two has passed it.A. bothB. eitherC. neitherD. each()2. ―Why did you _____ your last job?― Because I want to take on new challenges.A. eat upB. give upC. cheer upD. turn up()3. The speech contest I have devoted much time to ______ tomorrow.A. will holdB. will be heldC. holdingD. being held()4. ―What ______ your life and future? ―I do.A. depends onB. shapesC. dividesD. represents()5. I’m not sure _______ there’s a relationship between colours and moods.A. thatB. weatherC. whetherD. that if()6. These photos_____ me_____ the old days when I was young.A. let, thinkB. remind, ofC. make, thinkD. take, to ()7. ——It seems that Jimmy is feeling bad about the exam.——He needs to _______. A “C” is not the end of the world.A. cheer himself upB. calm himself downC. let himself downD. warm himself up ()8. ——Would you mind lending me your bike? ——_________.A. Certainly not, here you areB. Yes, OKC. Yes, my bike is brokenD. Yes, here you are.()9. She wears red today. Maybe she feels weak and _______ stressed.A. a little ofB. a little bit ofC. a bitD. abit little()10. _______ a GPS will make _______ easier for you to visit a strange place.A. Take; itB. To take; thatC. Taking; itD. Take; that ()11. Not only his parents but also his brother _______ to the Great Wall. They haven’t been back.A. have beenB. have goneC. has beenD. has gone()12. ——Mum, I think I’m _______ to get back to school.——Not really, my dear. You’d better stay at home for another day or two.A. so wellB. so goodC. well enoughD. ill enough()13. This pair of jeans looks nice _________ me because I look nice _______blue.A. on; inB. in; onC. for.; onD. to; in()14. ——Why not join them in their party?——Well, I am not invited. And I _______ to go to the cinema.A. preferB. discoverC. wishD. require()15. My parents want me to get further study to be ________ an engineer _______ a scientist, ________ I would like to be a famous surgeon doctor.A. neither; nor; andB. either; or; butC. not only; but; soD. both; and; or()16. The twins were born ______ the Year of Rabbit and ______ the same star sign.A. in, underB. in, onC. under, inD. under, on二、完形填空(10分)Tina was a seventeen-year-old girl who always wore a bright smile. She sufferedfrom a disease and had to use a walker most of the time. People didn’t speakto her very often. Maybe it was because she looked 1 and people didn’t knowhow to come near to her. Tina usually broke the ice with people she met witha big “ 2 .”In one class, I gave the students an assignment (作业) to recite(背诵) a poem. I only made the assignment worth a very small part of their total grade since I knew most of my students would not do it anyway. In the class, one by one each student 3 to correctly recite the poem. Finally, angry and half joking, I said that the next student who 4 recite the poem had to do three push-up (俯卧撑). To my surprise Tina was next. She used her walker to move to the front of the class. 5 she recited, she made a mistake. Before I could say a word, she 6 her walker and started doing push-ups. I wanted t o say, “Tina, I was just jok ing!”But she 7 , continued the poem and she finished the rest perfectly.When she finished, a student asked, “Tina, why did you do that? It’s not an important assignment!”“Because I want to be like you guys! To be 8 .” Tina said.Silence fell on the whole room when another student cried out, “Tina, we’re not normal! We are teenagers! We get in 9 all the time.”“I know,” Tina said as a big 10 spread across her face. The rest of th e students laughed, too.Tina got only a few points that day, but she got the love and respect of her classmates. To her, that was worth a lot more than a grade.( )1. A. different B. strong C. short D. young( )2. A. Sorry B. Bye C. Hi D. Thanks( )3. A. started B. planned C. continued D. failed( )4. A. shouldn’t B. couldn’t C. needn’t D. wouldn’t( )5. A. Because B. When C. After D. Though( )6. A. raised B. changed C. threw D. checked( )7. A. woke up B. gave up C. stood up D. made up( )8. A. happy B. social C. normal D. fair( )9. A. attentio n B. thought C. touch D. trouble( )10. A. cry B. smile C. sadness D. joy三、阅读理解(20分)AThree rich ladies met every day by the river. They sat there and talked the whole day. Once the three ladies quarreled(争吵). One of them said. “Look, how white and beautiful my hands are!” Another one said, “My hands are more beautiful.” The third one said, “Mine are the most beautiful ones.” An old beggar(乞丐)woman came up to them. “Beautiful ladies,” she said, “I’m hungry. Please give me something to eat.”But the three ladies gave her nothing. They only asked, “Tell me, old woman, which one of us has the most beautiful hands?”A peasant(农民)woman was also sitting by the river. She was poor and her hands were rough(粗糙的)because of hard work. The old woman came up to her and said, “I’m hungry. Please give me something to eat.” The peasant woman took out her only cake she had andgave her a half.The old woman ate it and drank some water. Then she took the peasant woman by the hand, brought her before the rich ladies and said, “Now, I shall tell you whose hands are the most beautiful. The hands of the poor peasant woman are rough because of work, but they give us food; they are far more beautiful than your hands which have done no thing.”( )1. The three ladies ___________.A. had a quarrel every dayB. were rich but unkindC. had a talk about their hands every dayD. lived by the side of the river ( )2. The old woman asked for something to eat, ___________.A. but none of the three rich ladies gave anything to herB. but only one of the three ladies gave her half a cakeC. because she wanted to know whose hands were beautifulD. because she wanted to know which lady was the richest( )3. The peasan t woman’s hands were not so white as the three ladies’ ___________.A. because of the hard work she had doneB. but she was stronger than any of themC. so she didn’t quarrel with the three ladiesD. but she was more beautiful than any of themBDo you enjoy visiting a museum? Did you ever make a plan before a visit? Every museum must have something that attracts you. And there are many possible ways to enjoy yourself in a museum.If you follow these steps below, you'll know what is worth seeing and doing, so that you can make the most of your time at the museum.Decide what museum you will visit. There are so many different kinds of museums and you first need to find one that you like. It's easy for you to choose one and start an enjoyable visit!Do some research online. Every museum now has a website which allows you to look through the information about it. On the website, you may look for such things as:*The exhibits(展品)–See what is on show at the museum at all times, and what special exhibitions are held for a short time.*The history of the museum –There will often be very interesting stories about the exhibits and the benefactors(捐赠者). That can make your visit more interesting.*Activities –See whether there are talks, tours our special activities on the day when you visit. Many museums hold some activities that meet the interests of all age groups. *Cost,food or shortage–It's important how much the visit will cost. You have to decide whether or not you can eat there. You might also need to find out transportation needs, as well as storage for coats, bags etc.Learn at least one thing on your visit.It is always good to take away something new from your visit.Plan breaks into your visit. When you walk around, standing here and studying exhibits there, you may become very tired. So it is important to take breaks. A break is a good opportunity for you to think of what you have seen and what else you might wan t to do in museum. Take a friend or two. Visiting museums is always a lot more fun when you are with someone else. You can talk over what you’re seeing. A friend also brings another way of thinking when you talk about the exhibit.( )4. To make our visit more interesting, we can__________.A. organize activities like special shows and talksB. read the stories about exhibits and benefactorsC. learn about the interests of all age groupsD. walk around the museum without breaks( )5.If we visit a museum with friends, we can__________.A. share the experience with themB. come up with strange ideasC. cut down the cost of the visitD. discuss the next visit plan( )6.What dose the massage mainly talk about?A. What to do in a museum.B. When to visit a museum.C. Where to find a museum.D. How to enjoy a museum.CLast year in the UK at least 45 pe ople died and 900 more were injured (受伤的) in car accidents where drivers were using their mobile phones.Yet many people continue to use them while driving even though it’s dangerous.Research has shown that it is difficult to concentrate on (专注于) driving and talking at the same time.It can even be more dangerous than driving after drinking too much. A recent study found that when drivers were talking on their mobile phones,their stopping times were 30 percent slower than when they had drunk too much—and nearly 50 percent slower than when they were driving normally. It also found that drivers talking on mobile phones were less able to control their cars than drunk drivers.And talking isn’t even the most serious problem, but texting is. Unbelievably, another recent study reported that 22% of adults admitted (承认) they had sent a text message while driving at least once in the past month. An average (平均的) text message takes 90 seconds to write and send. That means for one and a half minutes a driver is looking at their phone’s screen and not at the road. The arrival of new smart phones such as the iPhone will only make things worse as they will allow users to do more things than ever before.Using a mobile phone while driving puts others’ lives at risk. No matter how well we drive,if another driver is not careful,we are put in danger by their actions. Such drivers are selfish,careless and should have their driving licences (驾照) cancelled (撤销).There is no doubt that mobile phones can be fun and are useful,es pecially when you’re in trouble.But there is no need to use them while driving. Just wait until you stop or you will probably get into trouble of your own.( ) 7. The underlined word “them” in Paragraph 1 refers to _______.A. phone usersB. mobile phonesC. driversD. ears( )8. According to the passage,if a driver needs 10 seconds to stop when driving normally, they will need _______ seconds to stop when talking on a mobile phone.A. 12B. 13C.14D. 15( ) 9. According to the passage,in what order do the following activities influence driving?Dangerous→More dangerous→Most dangerousA. drinking→talking on phone→textingB. texting→talking on phone→drinkingC. talking on phone→drinking→textingD. drinking→texting→talking on phone ( ) 10. Why will new types of mobile phones make the driving problem worse?A. It will take longer to send text messages.B. People will want to talk on their phones more often.C. There will be more things for people to do with their phones.D. People think the new phones are easier and safer to use.四、根据句意和汉语注释,写出单词的正确形式。

江苏省无锡市2017-2018学年度 九年级数学期末模拟试卷

江苏省无锡市2017-2018学年度 九年级数学期末模拟试卷

九年级数学(上)期末模拟试卷一、选择题1. 如图,水平地面上有一面积为30πcm2的灰色扇形OAB,其中OA=6cm,且OA垂直于地面,将这个扇形向右滚动(无滑动)至点B刚好接触地面为止,则在这个滚动过程中,点O移动的距离是( )A.10πcm B.20πcm C.24πcm D.30πcm2. 如图,Rt△ABC中,∠C=90°,∠A=60°,AC=6,以斜边AB的中点D为旋转中心,把这个三角形按逆时针方向旋转90°得到Rt△A′B′C′,则旋转后两个直角三角形重叠部分的面积为( )A.6B.9C.6D.9二、填空题3. 如图,⊙O直径AB垂直于弦CD,垂足E是OB的中点,若AB=6,则CD= .4. 用一个半径为4cm,面积为12πcm2的扇形纸片围成一个圆锥的侧面,则这个圆锥的底面圆半径为 .5. 如图,△ABC中,∠AED=∠B,AD=2,DB=4,AE=3,则EC= .6. 如图,过x轴上一点A作平行于y轴的直线分别与抛物线y=x2及y=x2交于B、C两点,若正方形BCDE的一边DE与y轴重合,则此正方形BCDE的面积为 .7. 如图,△ABC中AB=AC=13,BC=10,点D在边AB上,以D为圆心作⊙D,当⊙D恰好同时与边AC、BC相切时,此时⊙D的半径长为 .三、解答题8. 如图,在坐标系的第一象限建立网格,网格中的每个小正方形边长都为1,格点△ABC 的顶点坐标分别为A(2,4)、B(0,2)、C(4,4).(1)若△ABC外接圆的圆心为P,则点P的坐标为 .(2)以点D为顶点,在网格中画一个格点△DEF,使△DEF∽△ABC,且相似比为1:2.(画出符合要求的一个三角形即可)9. 如图,△ABC中,∠BAC=45°,过A、B两点的⊙O交AC于点D,且OD∥BC,OD交AB 于点E.(1)求证:BC是⊙O的切线;(2)若∠OEB=60°,求AD:CD的值.10. 某网店销售一种成本价为每件60元的商品,规定销售期间销售单价不低于成本价,且每件获利不得高于成本价的45%.经测算,每天的销售量y(件)与销售单价x(元)的关系符合一次函数y=﹣x+120,设该网店每天销售该商品所获利润为W(元).(1)试写出利润W与销售单价x之间的函数关系式;(2)销售单价定为多少元时,该网店每天销售该商品可获得最大利润,最大利润是多少元?(3)若该网店每天销售该商品所获利润不低于500元,请直接写出销售单价x的范围.11. 如图,Rt△ABC中,AB=10,AC:BC=3:4,以斜边AB为直径作⊙O,动点P在直径下方的半圆AB上运动(不与A、B重合),过点C作CQ⊥CP,与PB的延长线交于点Q.(1)当CP⊥AB时,求CQ的长;(2)当点P运动到什么位置时,CQ取到最大值?求此时CQ的长.12. 如图,已知一次函数y=x+2的图象交y轴于点A,交x轴于点B,点E在x轴正半轴上,点F在射线BA上,且OE=OF=10.FH垂直x轴于点H.(1)点E坐标为 ,点F坐标为 .(2)操作:将一足够大的三角板的直角顶点Q放在射线AF或射线HF上,一直角边始终过点E,另一直角边与y轴相交于点P.问是否存在这样的点Q,使以点P,Q,E为顶点的三角形与△POE全等?若存在,求出点Q的坐标;若不存在,请说明理由.13. 如图,二次函数y=x2+m的图象经过点A(1,﹣),直线l经过抛物线的顶点B且与y轴垂直,设抛物线上有一动点P(a,b)从点A处出发沿抛物线向上运动,其纵坐标b随时间t(s)的变化关系为b=2t﹣,以线段OP为直径作⊙C.(1)求该二次函数的表达式;(2)当点P在起始位置点A处时,试判断直线l与⊙C的位置关系,并说明理由:在点P 移动的过程中,直线l与⊙C是否始终保持这种位置关系?请说明你的理由.(3)若在点P开始运动的同时,直线l也向上平行移动,移动速度为每秒3个单位长度,则当t在什么范围内变化时,直线l与⊙C相交?此时,若直线l被⊙C所截得的弦长为a,试求a2的最大值.。

江苏省无锡市2017-2018学年第一学期期末九年级数学试卷

江苏省无锡市2017-2018学年第一学期期末九年级数学试卷

江苏省无锡市2017-2018学年第一学期期末九年级数学试卷一、选择题(本大题共10小题,每小题3分,共30分.在每小题所给出的四个选项中,只有一项是正确的,请把正确的选项填在相应的括号内)1.已知tanA =1,则锐角A 的度数是( )A 、30°B 、45°C 、60°D 、75°2.关于x 的一元二次方程x 2+2x +k =0有两个相等的实数根,则k 的取值范围是( )A 、k =−1B 、k >−1C 、k =1D 、k >13.有一组数据:3,3,5,6,7.这组数据的众数为( )A 、3B 、5C 、6D 、74.抛物线y =(x −2)2+3的顶点坐标是( )A 、(2,3)B 、(−2,3)C 、(2,−3)D 、(−2,−3)5.以2和4为根的一元二次方程是( )A 、x 2+6x +8=0B 、x 2−6x +8=0C 、x 2+6x −8=0D 、x 2−6x −8=06.⊙O 的半径为5,圆心O 到直线l 的距离为6,则直线l 与⊙O 的位置关系是( )A 、相交B 、相切C 、相离D 、无法确定7.下列命题:①长度相等的弧是等弧 ②任意三点确定一个圆 ③相等的圆心角所对的弦相等 ④外心在三角形的一条边上的三角形是直角三角形,其中真命题有( )A 、0个B 、1个C 、2个D 、3个8.如图所示的扇形纸片半径为5cm ,用它围成一个圆锥的侧面,该圆锥的高是4cm ,则该圆锥的底面周长是( )(第8题图) (第9题图)A 、3πcmB 、4πcmC 、5πcmD 、6πcm9.如图,在平行四边形ABCD 中,点E 是边AD 的中点,EC 交对角线BD 于点F ,则 S △CDF :S 四边形ABFE 等于( )A 、1:3B 、2:5C 、3:5D 、4:910.如图,在△ABC 中,AB =10,AC =8,BC =6,以边AB 的中点O 为圆心,作半圆与AC 相切,点P ,Q 分别是边BC 和半圆上的动点,连接PQ ,则PQ 长的最大值与最小值的和是( )A 、9B 、10C 、213+1D 、332 二、填空题(本大题共8小题,每小题2分,本大题共16分.不需要写出解答过程,只需把答案直接填写在相应的横线上)11.若y x =23,则yy x 的值为_______.12.一个不透明的口袋中有5个完全相同的小球,分别标号为1,2,3,4,5,从中随机摸出一个小球,其标号是偶数的概率为_________.13.方程2x −4=0的解也是关于x 的方程x 2+mx +2=0的一个解,则m 的值为________.14.若点A (−2,y 1),点B (4,y 2)在二次函数y =x 2−2x +c 的图象上,则y 1,y 2的大小关系为_________.15.甲、乙两名同学参加“古诗词大赛”活动,五次比赛成绩的平均分都是85分,如果甲比赛成绩的方差为S 甲2=16.7,乙比赛成绩的方差为S 乙2=28.3,那么成绩比较稳定的是________(填“甲”或“乙”)16.如图,△ABC 的外接圆O 的半径为2,∠C =30°,则扇形AOB 的面积是________.(第16题图)(第17题图)17.如图,在扇形铁皮AOB 中,OA =10,∠AOB =36°,OB 在直线l 上.将此扇形沿l 按顺时针方向旋转(旋转过程中无滑动),当OA 第5次落在l 上时,停止旋转.则点O 所经过的路线长为________.18.如图,在正方形ABCD 中,P 是BC 的中点,把△PAB 沿着PA 翻折得到△PAE ,过C 作CF ⊥DE 于F ,若CF =2,则DF =__________.(第18题图)三、解答题(本大题共10小题,共84分.请在试卷相应的区域内作答,解答时应写出文字说明、证明过程或演算步骤)19.计算或求值:(1)12−2cos60°+(2018−π)0;(2)已知y x y x +-243=21,求yx 的值.20.解方程:(1)x2−4x−4=0;(2)x(x−2)=15.21.如今通过微信朋友圈发布自己每天行走的步数已成为一种时尚.“健身达人”小张为了了解他的微信朋友圈里大家的运动情况,随机抽取了部分好友进行调查,把他们1月29日那天每人行走的步数情况分为五个类别:A(0~4000步)(说明:0~4000表示大于或等于0,小于或等于4000,下同)、B(4001~8000步)、C(8001~12000步)、D(12001~16000步)、E(16000步以上),并将统计结果绘制了如图1和2两幅不完整的统计图.请你根据图中提供的信息解答下列问题:(1)小张随机抽取了________名微信朋友圈好友;(2)将图1的条形统计图补充完整;(3)已知小张的微信朋友圈里共300人,请根据本次抽查的结果,估计在它的微信朋友圈里1月29日那天行走不超过8000步的人数.22.在一个不透明的布袋中装有形状大小都相同的三个小球,每个小球上各标有一个数字,分别是1,2,3.现规定从布袋中任取一个小球,对应的数字作为一个两位数的十位数字;然后把小球放回袋中并搅匀,接着从袋中再任取一个小球,对应的数字作为这个两位数的个位数字.(1)请你用画树状图或列表法分析并写出按上述规定得到所有可能的两位数;(2)从这些两位数中任取一个,求其算术平方根大于4且小于5的概率.23.如图所示,在平面直角坐标系中有一格点三角形,该三角形的三个顶点为:A(1,1),B(−3,1),C(−3,−1).(1)若△ABC的外接圆的圆心为P,则点P的坐标为_______,⊙P的半径为_________;(2)如图所示,在11×8的网格图内,以坐标原点O点为位似中心,将△ABC按相似比2:1放大,A、B、C的对应点分别为A'、B'、C'.①画出△A'B'C';②将△A'B'C'沿x轴方向平移,需平移______个单位长度,能使得B'C'所在的直线与⊙P相切.24.图①为一种平板电脑保护套的支架效果图,AM固定于平板电脑背面,与可活动的MB、CB部分组成支架.平板电脑的下端N保持在保护套CB上.不考虑拐角处的弧度及平板电脑和保护套的厚度,绘制成图②.其中AN表示平板电脑,M为AN上的定点,AN=CB=20cm,AM=8cm,MB=MN.我们把∠ANB叫做倾斜角.(1)当倾斜角为45°时,求CN的长;(2)按设计要求,倾斜角能小于30°吗?请说明理由.25.如图,AB是⊙O的直径,∠BAC=90°,四边形EBOC是平行四边形,EB交⊙O于点D,连接CD并延长交AB的延长线于点F.(1)求证:CF是⊙O的切线;(2)若∠F=30°,EB=4,求图中阴影部分的面积(结果保留根号和π)26.近期江苏省各地均发布“雾霾”黄色预警,我市某口罩厂商生产一种新型口罩产品,每件制造成本为18元,试销过程中发现,每月销售量y (万件)与销售单价x (元)之间的关(1)请你从所学过的一次函数、二次函数和反比例函数三个模型中确定哪种函数能比较恰当地表示y 与x 的变化规律,并直接写出y 与x 之间的函数关系式为;(2)当销售单价为多少元时,厂商每月获得的利润为440万元?(3)如果厂商每月的制造成本不超过540万元,那么当销售单价为多少元时,厂商每月获得的利润最大?最大利润为多少万元?27.如图,已知△ABC 中,∠C =90°,点M 从点C 出发沿CB 方向以1cm/s 的速度匀速运动,到达点B 停止运动,在点M 的运动过程中,过点M 作直线MN 交AC 于点N ,且保持∠NMC =45°.再过点N 作AC 的垂线交AB 于点F ,连接MF ,将△MNF 关于直线NF 对称后得到△ENF .已知AC =8cm ,BC =4cm ,设点M 运动时间为t (s ),△ENF 与△ANF 重叠部分的面积为y (cm 2).(1)用含t 的代数式表示出NC 与NF ;(2)在点M 的运动过程中,能否使得四边形MNEF 为正方形?如果能,求出相应的t 值,如果不能,说明理由;(3)求y 与t 的函数关系式及相应t 的取值范围.28.如图,在平面直角坐标系xOy 中,抛物线y =ax 2−2ax −3a (a <0)与x 轴交于A 、B 两点(点A 在点B 的左侧),经过点A 的直线l :y =kx +b 与y 轴负半轴交于点C ,与抛物线的另一个交点为D ,且CD =4AC .(1)求出点A 的坐标和点D 的横坐标;(2)点E 是直线l 上方的抛物线上的动点,若△ACE 的面积的最大值为45,求a 的值; (3)设P 是抛物线的对称轴上的一点,点Q 在抛物线上,以点A 、D 、P 、Q 为顶点的四边形能否成为矩形?若能,直接写出点P 的坐标;若不能,请说明理由.。

【学期】江苏省无锡市2017届九年级物理上学期第一次学业质量检测试题苏科版

【学期】江苏省无锡市2017届九年级物理上学期第一次学业质量检测试题苏科版

【关键字】学期江苏省无锡市新安中学2017届九年级物理上学期第一次学业质量检测试题一、选择题(每题2分,共24分)1.如图所示的简单机械中,使用时一定费力的是()2.如图所示的四种情景中,人对物体做功的是()3.小刚家厨房里有一把多功能剪刀,右图中标注了该剪刀的相关用途,对于它的使用,以下分析正确的是()A.做启瓶器使用时:它是一个费力杠杆B.做剪刀使用时:物体越靠近O点越省力C.做削皮刀使用时:刀刃很锋利,是为了增大压力把果皮削掉D.做挤压钳使用时:挤压齿尖锐,是为了减小压强把果壳挤开4.小文同学采用如图所示的甲、乙两种不同的方式将同一货物从地面匀速搬运到同一辆汽车上,其中说法正确的是()A.甲种方法克服重力做功多B.乙种方法更省力C.两种方法机械效率相等D.两种情况下,货物机械能都增加5.小明做完课间操从底楼走到二楼教室,此过程小明克服重力做的功最接近于()A.150JB.150WC.1500JD.1500W6.如图所示,小球由A运动开始沿光滑的斜面下滑,经过B、C两位置时具有相同的()A.速度B.动能C.重力势能D.机械能7.下列说法中正确的是()A.机械效率越大,功率越大B.机械做功时,做的有用功越多,机械效率越大C.机械做功时,工作时间越短,功率一定越大D.利用机械做功时可以省力或省距离,但不能省功8.如图所示,甲、乙两物体做功和所需时间关系图像,由图可知()A.P甲>P乙B.P甲< P乙C.P甲= P乙D.无法确定9.为了探究杠杆的平衡条件,物理老师带来了一个自制杠杆AB,从其上找一点C用支架支起来,如图所示.当小强依次在杠杆上的A1、A2、A等各点施加一个竖直向下的力时,发现越来越容易提起水桶.根据这一实验现象大家提出的以下四个问题中,其中最有探究价值且易于探究的科学问题是()A.水桶重和位置不变,杠杆平衡时,为什么施力点离支点越远就越省力?B.水桶重和位置不变,杠杆平衡时,动力和动力作用点之间存在着怎样的关系?C.阻力和阻力臂不变,杠杆平衡时,动力和动力臂之间存在着怎样的关系?D.杠杆平衡时,动力和动力臂、阻力和阻力臂之间存在着怎样的关系?10.如图所示甲、乙两套装置所用滑轮质量均相等,用它们分别将所挂重物在相等时间内竖直向上匀速提升相同高度。

精选江苏省无锡市2017届九年级英语下学期第一次模拟试题

精选江苏省无锡市2017届九年级英语下学期第一次模拟试题

江苏省无锡市2017届九年级英语下学期第一次模拟试题第I卷(客观题共70分)一、听力测试(共20分,每小题1分)第一部分听对话回答问题,本部分共有10道小题,每小题你将听到一段对话,每段对话听2遍。

在听每段对话前你将有5秒钟的时间阅读题目,听完后,你还将有5秒钟的时间选择你认为最合适的备选答案,在听到“滴”的信号后,进入下一小题。

( )1. What are they talking about?A. B. C.( )2.Where is the man’s father?A. B. C.( ) 3. What is the man’s suggestion?A. B. C.( ) 4.What did the boy’s mum buy yesterday?A. B. C.( ) 5.Where is the woman from?A. Canada.B. America.C. Germany.( )6. What does the man mean?A. He did better than the woman.B. He was sure he did well.C. The girl got the first place.( )7. What kind of animals does Lisa like best?A. Monkeys.B. Dogs.C. Elephants.( )8. What month is it?A. January.B. February.C. December.( )9. What has the man done?A. He has done some washing.B. He has done some cleaning.C. He has done some cooking.( )10. What do we know about Bob?A. He’s a hard-working boy.B. He often does his homework with others’ help.C. He often forgets his homework.第二部分听对话和短文答题,你将听到一段对话和2篇短文,各听两遍。

2018年无锡市模拟中考化学17题训练专题.docx

2018年无锡市模拟中考化学17题训练专题.docx

2018无锡市中考化学一模17题专项训练17-1 (6分)现代循环经济要求综合考虑环境污染和经济效益。

高纯氧化铁可作现代电子 工业的材料,以下是用硫铁矿烧渣(主要成分为F3O3、FeO 、SiO 2)为原料制备高纯氧化 铁(FeQ3)的生产流程示意图:提示:(NHD2CO3溶液呈碱性,40笆以上时(NHD2CO3分解(1)实验室中,操作I 、操作II 用到的玻璃仪器有玻璃棒、烧杯、等。

(2) 滤液I 中主要的溶质是 o(3) 加适量氨水的1的是 o(4)根据题中信息,加入(NH4)2CC>3后,该反应必须控制的条件是。

(5) 滤液II 中可回收的产品是 (写化学式)。

(6) 写出在空气中嘏烧FeCO 3的化学反应方程式- 17-2 (6分)硫酸铜是一种应用极其广泛的化工原料,易溶于水而不易溶于酒精;铜离子 完全沉淀的pH 是5左右,铁离子完全沉淀的pH 是2左右。

以下是某工厂用含铁废铜为原料生产胆 矶(CuS04 • 5H=0)和副产物石膏(CaS04 • 2H 20)的生产流程示意图:胆矶和石膏在不同温度下的溶解度(g/100g 水)如表。

温度(°C )20 40 60 80 100 石膏0. 32 0. 26 0. 15 0. 11 0. 07 胆矶 32 44.6 61.8 83.8 114请回答下列问题:(1)红褐色滤渣的主要成分是; (2) 铜和稀硝酸反应的化学方程式3C U +8HN03= (3) 石灰浆调pH 大约要调节到—A. 2B. 5C. 7D. 10稀硝酸与稀疏 工土笙 酸的混合成 石茨笨废铜一!演出17- > Cu 2t Fe" (浸由液调节D H L 静置 取样 总囊__ 过瓣 操作I 樵作II 囊发、饿疆______ 、过潮| 产品红褐色 石晋 旎渣七曾 母液+2N0 t +4HQ ;(4)操作I最后温度应该控制在°C左右;(5)从溶液中分离出硫酸铜晶体的操作II应为蒸发浓缩、、过滤、洗涤、干燥;晶体用无水乙醇作洗涤液而不用蒸馅水的原因是o17-3(5分)孔雀石主要含C U2(OH)2CO3,还含少量Fe、Si的化合物。

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初三第一次适应性练习英语试卷2018.3一、单项选择1.---can you run without a stop?--- I have no idea. I’m never tired.A.How farB. How soonC. How muchD. How often2.The moving stories the Chinese great achievements show the people’s hard work and spirit in the film, Amazing China.A.behindB. ofC. aboutD. with3.What a big deal! The well-designed book shelf simply cost the marked price.A.25 percent as less asB. less than 25 percentC.25 percent much thanD. 25 percent as much4.The newspaper has picked out some events that mattered to the world last year andour world for years to come.A.influenceB. influencedC. will influenceD. have influenced5.--- Why is the game called Travel Frog(旅行青蛙)so popular?--- I guess it has something to do with .A.How did people feel like in the gameB.How lonely people are in their real lifeC.How much do people enjoy travellingD.Whether people’s love for travelling with frogs6.What a heavy snow! Some unexpected problems may be in the following days.A.appearedB. hitC. inventedD. created7.---We can’t really change this crazy world we live in, can we?---Yes. We most can.A.certainlyB. neverC. almostD. otherwise8.His talent of different styles of music has caught the attention of many musicians.A.setting upB. building upC. making upD. taking up9.The photo which has won the first prize has a great of color, content and feelings.A.advantageB. backgroundC. balanceD. landscape10.I thought the new iPhone8 was user-friendly, but it just work. There is something wrong with it.A.couldn’tB. won’tC. mustn’t needn’t11.This training program can give you a rise at work, increase your pay by 40%, so you’d better put some efforts into it.A.as soon asB. so much asC. as well asD. as possible as12.He was just as as Mary was to hear the poor result announced by the host.A.amazedB. amazingC. satisfiedD. satisfying13.---He was nearly chosen as the chairperson. What a pity a small mistake cost him the great chance.---.A.Practice makes perfectB. A miss is as good as a mileB.Never say bad words about others behind D. No pains, no gains14.---Shall I help you with your heavy bag, lady?---Thanks a lot. .A.If you likeB. Of course you canC.That couldn’t be betterD. It depends二、完形填空Ibby Piracha is one of many common customers at his local Starbucks in a small town in Virginia, US. However, Ibby isn’t like the other regulars(老顾客)---he’s 15 .Krystal Payne, a new waitress, wanted to do something to make Ibby feel more 16 .So she spoke with other waiters about Ibby, learning that they always did what they could to give him excellent service.But Payne wanted to take it a step further.She went home and spent her night learning American Sign Language so she could better communicate with Ibby. The next day, she wrote him a small note saying:”I’ve been learning ASL, just so you can have the same 17 as everyone else.”Ibby was so moved by Payne’s action that he posted(贴) it on Facebook to share with his friends.His 18 was then reposted by many other people---a result that he did not 19 . But he is happy that Payne is getting what she deserves(应得).The next morning, Payne heard about the post when her manger 20 her and mentioned that there were many requests (请求) from reporters to interview her. A Starbucks spokeswoman heard about her 21 action and said the company was “very proud” of Payne’s actions.“My job is to 22 people have the experience they expect and that’s what I gave him,” said Payne.Ibby sees Payne’s act of kindness as special encouragement. “ It shows that she respects deaf people,” he said.Payne now knows enough ASL to take Ibby’s 23 , which makes Ibby’s life much easier. In the past, Ibby would have to order through text messages that he would show to the waiters.Ibby still loves to visit the coffee shop, saying it is something that “gave me true 24 even now, I’m still smiling.”15.A. quiet B. famous C. deaf D. blind16.A. welcome B. cheerful C. different D. confident17.A. right B. experience C. chance D. mood18.A. story B. note C. post D. picture19.A. expect B. care C. want D. notice20.A. praised B. celebrated plained D. warned21.A. strange B. important C. kind D. brave22.A. protect B. promise C. allow D. make sure23.A. step B. rule C. order D. advice24.A. surprise B. pride C. challenge D. happiness三、阅读理解AThis is a tourist guide to Sunset IslandHere is some information of three tourists who are travelling on the sunset island. Which of the things will they enjoy most?25.Peter enjoys hiking in the countryside, may be most suitable for him.26.Sally likes to go out at night and enjoys meeting people and dancing, may be her best choice.27.Dave is interested in history and learning about the past, will probably be what he enjoys most.BThe same morning.Grandpa,Nat,Robbie,and Alexandra are talking on the patio(露台).Nat:There is a way,Malcolm.We get our friends to roll their sleeves up and get to work.Grandpa:It's certainly a good idea.If I could take a look at the place,I could probably tell what it requires to fix it up. How much paint,how many hours of work…Nat:That's what I came to ask you to do,Malcolm.If you would supervise the refurbishing,I'll find the people to help do it.Robbie:I'll help too,Mr.Baker.I can get some of my friends to go around the neighborhood and collect the furniture we need.Alexandra:I'll help.Grandpa:Tomorrow.Yes.We'll meet tomorrow morning,right here.Robbie:Can we help?Alexandra:I'd really like to.Nat:We might need you to come through with your friends,Robbie.Not just to go around the neighbor asking for furniture,but to help with the paint job.That's backbreaking work and maybe too much for us.Robbie:I'll do it.I'll talk to them.Alexandra:And tomorrow morning we'll all meet here to discuss the plan?Grandpa:Tomorrow morning it is.The next morning.Grandpa is in the kitchen.He is waiting for Nat's and Robbie's friends to arrive.28.How many characters are there in this play?A.fourB. fiveC. less than fourD. more than five29.The underlined word “backbreaking” means .A.amazingB.tiringC.meaningfulD. trying30.Who is most likely to take the lead in the project?A.GrandpaB. RobbieC. MalcolmD. NatCFlights are often canceled for many different reasons, including snow, clouds, or even a bird getting caught in an airplane’s engine(发动机). But you’d never think that too muchsunshine would stop a plane from taking off.Unluckily for passengers in Phoenix, US this summer, their travel plans went dead when more than 40 flights in and out of the local airport were canceled after temperatures went as high as 48℃. This is the highest temperature that many smaller planes are allowed to fly at.So what is it that makes flight in great heat so dangerous? The answer lies in how”thick”, the air is.“ As air warms up, it expands(膨胀), and there’s fewer molecules(分子) under your wings,” Lou McNally, a professor at Embry-Riddle Aeronautical University in the US, told the Associated Press(AP).When the temperature is high and the air becomes thin, “you need more of everything. You need more thrust(推力)to take off. You need more distance to take distance to take off. You need more distance to land. It gets to a point for some aircraft that it gets just too much,”McNally explained.The US’ Southwest, where Phoenix is located, is experiencing an unexpectedly hot summer.This June was its third-hottest on record. According to The Guardian, up to 10 people arethought to have died as a result of the hot weather.The unexpected heat attacked airlines(航空公司)too, causing them to cancel all flights running on smaller planes for the safety of their passengers.But what about cities whose temperatures are high every summer?Many airplanes in hot Gulf countries such as the United Arab Emirates make many flights at night or in the early morning to avoid the problem of thin air, according to AP. They also mainly use larger planes, which are able to fly in greater heat than smaller planes.After the temperature in Phoenix continued to climb over 40℃all through the rest of the summer, maybe now would be a good time for airlines to buy bigger planes in time for next year’s heat wave.31.When the weather is too hot, .A.planes are more likely to break downB.planes need more power and distance to take offC.there is much more air under the wings of a planeD.it takes less time for planes to take off and land32.How do airplanes in Gulf countries deal with high temperatures?A.They make many flights at midday.B.They mainly use small planes.C.They build long runways for planes.D.They make fewer flights at midday.33.What’s the article mainly about?A.Flight accidents caused by great heat.B.Perfect flying conditions for aircraft.C.How dangerous the flights are in hot weather.D.How hot weather influences flights.DThe most awful words in the English language are, “Our computer is down.” You hear it more and more when you are on business. The other day I was at the airport waiting for a ticket to Washington and the girl in the ticket office said, “I’m sorry, I can’t sell you a ticket. Our computer is down.”“If your computer is down, just write me out a ticket.”“I can’t write you out a ticket. The computer is the only one allowed to do so.”I looked down on the computer and every passenger was just standing there drinking coffee andstaring at the black screen. Then I asked her, “What do all you people do?”“We give the computer the information about your trip, and then it tells us whether you can fly with us or not.”“So when it goes down, you go down with it.”“That’s good, sir.”“How long will the computer be down?” I wanted to know.“I have no idea. Sometimes it’s down for 10 minutes, sometimes for two hours. There’s no way we can find out without asking the computer, and since it’s down it won’t answer us.”After the girl told me they had no backup(备用) computer, I said. “Let’s forget the computer. What about your planes? They’re still flying, aren’t they?”“I couldn’t tell without asking the computer.”“Maybe I could just go to the gate and ask the pilot if he’s flying to Washington, ” I suggested.“I wouldn’t know what gate to send you to. Even if the pilot was going to Washington, he couldn’t take you if you didn’t have a ticket.”“Is there any other airline(航空公司)flying to Washington within the next few hours?”“I wouldn’t know, ” she said, pointing at the dark screen. “Only ‘IT’ knows. ‘It’ can’t tell me.”By this time there were quite a few people standing in lines. The word soon spread to other travelers that the computer was down. Some people went white, some people started to cry and still others kicked their luggage.34.The best title for the article is _______.A.The Most Awful Words B.When the Computer Is DownC.The Computer of the Airport D.Asking the Computer35. What could the girl in the ticket office do for the passengers without asking the computer?A.She could sell a ticket.B.She could write out a ticket.C.She could answer the passengers’ questions.D.She could do nothing.36. Why do you think they had not a backup computer?A.Because it was easy downB.Because it was very expensive.C.Because it was not advanced enough.D.Because it was not as big as the main computer.37. The last paragraph suggests that _______.A.a modern computer won’t be down.B.computers can take the place of humansC.sometimes a computer may bring suffering to peopleD.there will be great changes in computers四、词汇运用38. The naught boy threw a stone into a pool to change the (表面) of the water.39. The concerts (今晚) are supposed to attract large numbers of fans of the pianist.40. After learning safety tips, I know (逗留) where one gets hurt is the first thing to do.41. A growing number of gun accidents call for much (严厉的) laws to control guns.42. Stephen Hawking, passed away on March 14, 2018. His death is thought of the great(lose) to the whole world.43.When getting older and older, groups of people seem rather (forget).44.The (usual) high winter temperature have sent a warning to us that our world is in danger.45.Over the past five years, Hua Chenyu has risen from a(n) (know) singer to one of the pop music’s biggest rising stars.五、动词填空46.Some laws need to be made because some bike-sharing companies have failed(return) the deposition(押金) to users.47.What Lily has to remember, however, (be) that every person on this planet is only here for a short time.48.These papers (lay) on the desk when I left the office, but nobody has seen them ever since.49.Stella, you always (regret) what you said and did! President Donald Trump has already made many decisions that (surprise) the US and the world since he took office.51.Books of different kinds in different languages are the key to (spread) cultures around the world.52.If you want your parents to respect you, (show) your parents that you have grown up by doing well in school and in your daily life. That is the wise choice.53.The article is written with the left hand. As a result, it (not read) comfortably.六、阅读填空These days, the environment is a huge topic. It seems like we’re always being reminded to recycle, or to ride a bike instead of taking a taxi.However, it isn’t just rubbish and traffic that can cause harm to the environment.According to a recent study by the University of California, published by the journal Science Advances, fertilizer(化肥) in farm soils is a major contribution to smog in nearby cities. According to the research, agricultural soils make up of 25 to 41 percent of nitrogen oxide emissions(氮氧化物排放) in California. Nitrogen oxide, or NOx, is a major cause in smog formation.“Emissions of NOx from agricultural areas are much higher than we used to believe and could be a major source(来源) of NOx statewide,” the researchers wrote in the study.Just like fertilized farmland, there are many other things that we wouldn’t expect to have a huge influence on the environment. Take clothes for example. Data(数据) published by the World Wildlife Foundation says that every kilogram of cotton takes around 10,000 liters of water to produce.This means that it takes around 6,000-8,000 liters of water just to create a single pair of jeans, not to mention the carbon produced when they’re made in the factory and then transported to a store.And even what we choose to eat could be bad for the planet.In a 2014 study carried out by a professor in New York, US, it was found that beef farming could be causing more harm to the environment than all of the planet’s cars.So does this mean that we should all stop buying jeans and eating beef? That would certainly help, although it’s not a practical goal.Instead, a few simple changes could be made. For example, there’s no need to buy new jeans every year when a good pair can last much longer than that.And when it comes to food, taking the place of the beef in our dishes with chicken or pork every now and then will still mean they taste as delicious.Indeed, small actions could make a huge difference to our planet.七、完成句子59.当被发现这个机器人质量不合格,它被退回了商店。

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