2020-2021学年第一学期山东省滕州市张汪中心学校期末复习综合练习题九年级英语
山东省滕州市张汪二中2020-2021学年度第一学期周末提优卷九年级数学试题
山东省滕州市张汪二中2020-2021学年度第一学期周末提优卷九年级数学试题(2020年10月17日)
一、单选题
1.下列各组线段中,长度成比例的是()
A.2cm、3cm、4cm、1cm B.1.5cm、2.5cm、4.5cm、6.5cm
C.1.1cm、2.2cm、3.3cm、4.4cm D.1cm、2cm、2cm、4cm
2.如图,AD∥BE∥CF,点B,E分别在AC,DF上,DE=2,EF=AB=3,则BC长为()
A.B.2 C.D.4
3.已知2x=3y(y≠0),则下面结论成立的是()
A.B.
C.D.
4.若x:(x+y)=3:5,则x:y=()
A.B.C.D.
5.如图,在正方形网格上,与△ABC相似的三角形是()
A.△AFD B.△FED C.△AED D.不能确定
6.如果实数m¹n,且,则m+n=()
A.6 B.7 C.8 D.9
7.在一张比例尺为的地图上,量得、两地的距离是5,那么、两地的实际距
离是()
A.B.
C.D.
8.如图,DE∥FG∥BC,若DB=4FB,则EG与GC的关系是()
A.EG=4GC B.EG=3GC C.EG=GC D.EG=2GC
9.如图,在△ABC中,DE∥AB,且=,则的值为()
A.B.C.D.
10.如图,在中,点在边上,,连接交于点,则为()
A .B.C.D.
11.要制作两个形状相同的三角形框架,其中一个三角形的三边长分别为,和,另一个三
角形的最短边长为2.5 cm,则它的最长边为()
A.3cm B.4cm C.4.5cm D.5cm。
山东省滕州市张汪中学2020-2021学年度第一学期单元检测九年级物理第十三章:内能(无答案)
山东省滕州市张汪中学2020-2021学年度第一学期单元检测九年级物理第十三章:内能一、单选题1.用分子的知识解释生活中的现象,其中合理的是()A.酒精挥发说明酒精分子的体积增大了B.水结成冰,是因为温度降低,分子运动停止了C.今年我国出现的新冠肺炎之所以传播的这么快,是因为分子运动的快造成的D.香水香说明分子总是在不断地做无规则运动2.将50mL的水与50mL的酒精混合,所得液体体积小于100mL.下列对此现象的解释合理的是()A.分子间是有空隙的B.分子是由原子构成的C.分子的质量和体积都很小D.分子总是在不断运动3.5月31日是“世界无烟日”,吸烟有害健康已成为同学们的共识,会议室里贴了如图的标志,这主要是考虑到在空气不流通的房间里,只要有一个人吸烟,整个房间就会充满烟味,这是因为()A.分子在不停地运动B.分子间有引力C.分子间有斥力D.物质是由分子组成的4.学习了分子动理论之后,小明总结了很多生活中与分子动理论有关的现象,下列总结中不正确的是A.“花气袭人知骤暖”说明分子的热运动与温度有关B.人造木板黏结剂中的甲醛扩散到空气中造成环境污染C.用透明胶带揭下纸上写错的字,是因为胶带与纸之间有相互的斥力D.“破镜不能重圆”是分子间的距离太大,作用力变得十分微弱5.关于温度、热量和内能,下列说法正确的是A.物体的温度越高,所含热量越多B.物体内能增大,可能是吸收了热量C.0℃的冰块,内能一定为零D.物体吸收热量,温度一定升高.6.在结婚仪式上,人们常用到礼花筒,它利用筒内的高压空气膨胀,将彩带喷向空中,产生喜庆效果。
则高压空气膨胀过程中()A.内能转化为机械能B.机械能转化为内能C.对外做功内能增加D.高压空气温度升高7.下列说法中,能反映物体放出热量的多少跟物体质量有关的是A.不同质量的同种物质,降低相同的温度,放出的热量不同B.相同质量的同种物质,降低不同的温度,放出的热量不同C.相同质量的不同物质,降低相同的温度,放出的热量一般不同D.不同质量的同种物质,降低不同的温度,放出的热量一般不同8.质量相等的铜块和铁块(c铜<c铁),在吸收了相等的热量后相互接触,那么()A.热由铜块传给铁块B.热由铁块传给铜块C.铜块和铁块之间不发生热传递D.以上情况都有可能9.下列说法中,能反映物体放出的热量多少与物体降低的温度有关的是A.相同质量的同种物质,降低不同的温度,放出的热量不同B.相同质量的不同物质,降低相同的温度,放出的热量一般不同C.不同质量的同种物质,降低相同的温度,放出的热量不同D.不同质量的同种物质,降低不同的温度,放出的热量一般不同10.有三种液体分别用相同的热得快加热,如图所示的是加热时液体温度随时间变化的图象.下列分析不正确的是A.如果b、c质量相同,b的比热容小于c的比热容B.如果a、b是同种物质,a的质量大于b的质量C.b的沸点高于c的沸点D.如果a、b是不同种物质,它们的沸点相同11.A、B两物体质量相等,温度均为10℃,甲乙两杯水质量相等,温度均为50℃.现将A放入甲杯,B 放入乙杯。
山东省滕州市张汪二中2020-2021学年度第一学期周末提优卷九年级数学试题(2020年9月18日)(无答案)
山东省滕州市张汪二中2020-2021学年度第一学期周末提优卷九年级数学试题(2020年9月18日)一、单选题1.关于的二次方程的一个根是0,则a的值是()A.1 B.-1 C.1或-1 D.0.52.制造一种产品,原来每件成本是100元,由于连续两次降低成本,现在的成本是81元,则平均每次降低的百分率是()A.8.5% B.9% C.9.5% D.10%3.若a,b,c满足则关于x的方程的解是( )A.1,0 B.-1,0 C.1,-1 D.无实数根4.一元二次方程配方后可化为()A.B.C.D.5.若(b≠0),则=()A.0 B.C.0或D.1或 26.方程的根是()A.5和B.2和C.8和D.3和7.如图,某小区规划在一个长、宽的长方形场地上修建三条同样宽的通道,使其中两条与平行,另一条与平行,其余部分种花草.要使每一块草坪的面积都为,那么通道的宽应该满足的方程为()A.B.C.D.8.已知x=3是关于x的一元二次方程x2﹣2x﹣m=0的根,则该方程的另一个根是()A.3 B.﹣3 C.1 D.﹣19.已知关于x的一元二次方程,它的两根之积为-4.则k的值为().A.-1 B.4 C.-4 D.-510.若一元二次方程的两个根分别为,则的值为()A.-4 B.-2 C.0 D.111.如果关于的一元二次方程有下列说法:①若,则;②若方程两根为-1和2,则;③若方程有两个不相等的实根,则方程必有两个不相等的实根;④若,则方程有两个不相等的实根,其中结论正确的是有()个。
A.1 B.2 C.3 D.412.定义新运算:a*b=a(m﹣b).若方程x2﹣mx+4=0有两个相等正实数根,且b*b=a*a(其中a≠b),则a+b的值为()A.﹣4 B.4 C.﹣2 D.2二、填空题13.设a,b是方程x2+x﹣2018=0的两个实数根,则(a﹣1)(b﹣1)的值为_____.14.如果关于x的方程4mx2-mx+1=0有两个相等实数根,那么它的根是_________.15.对于实数a,b,定义运算“”,例如,因为,所以.若是一元二次方程的两个根,则_________.16.a是方程的一个根,则代数式的值是_______.17.关于x的方程(m﹣2)﹣x+3=0是一元二次方程,则m=_____.18.若M=,N=,则M、N的大小关系为M ____N.(填“>”、“<”、“”或“”)三、解答题19.先化简,再求值:,其中x为方程的根.20.小张2019年末开了一家商店,受疫情影响,2020年4月份才开始盈利,4月份盈利6000元,6月份盈利达到7260元,且从4月份到6月份,每月盈利的平均增长率都相同.(1)求每月盈利的平均增长率.(2)按照这个平均增长率,预计2020年7月份这家商店的盈利将达到多少元?21.已知关于x的一元二次方程.(1)求证:不论k为何值,方程总有两不相等实数根;(2)设x1,x2是方程的根,且x12-2kx1+2x1x2=2,求k的值.22.在2020年新冠肺炎疫情期间,某中学响应政府有“停课不停学”的号召,充分利用网络资源进行网上学习,九年级1班的全体同学在自主完成学习任务的同时,彼此关怀,全班每两个同学都通过一次电话,互相勉励,共同提高,如果该班共有48名同学,若每两名同学之间仅通过一次电话,那么全同学共通过多少次电话呢?我们可以用下面的方式来解决问题.用点分表示第1名同学、第2名同学、第3名同学…第48名同学,把该班级人数x与通电话次数y之间的关系用如图模型表示:(1)填写上图中第四个图中y的值为_______,第五个图中y的值为_______.(2)通过探索发现,通电话次数y与该班级人数x之间的关系式为________,当时,对应的________.(3)若九年级1班全体女生相互之间共通话190次,问:该班共有多少名女生?。
山东省滕州市张汪中学2020-2021学年度第一学期九年级数学期末复习综合练习题(无答案)
2020-2021学年度第一学期山东省滕州市张汪中学期末复习综合练习题九年级数学一、单选题1.已知方程3x2-2x-4=0的两根分别为x1和x2,则x1+x2的值为()A.-B.C.-D.2.在反比例函数图像上有两点,,,,则的取值范围是().A.B.C.D.3.如图,在平面直角坐标系中,已知与是位似图形,原点是位似中心,位似比,若,则的长为().A.5 B.6 C.9 D.124.如果关于x的一元二次方程x2﹣4x﹣k=0有两个不相等的实数根,那么k的取值范围是()A.k<﹣4 B.k<4 且k≠0C.k>﹣4 D.k>﹣4且k≠0 5.在中,,,,则的长为()A.2 B.3 C.D.6.如图,边长为4的正方形OABC的两边在坐标轴上,反比例函数的图象与正方形两边相交于点D、E,点D是BC的中点,过点D作DF⊥OA于点F,交OE于点G,则()A.3 B.2 C.4 D.87.布袋里有几百个乒乓球,想要估计球的数量,可以先从口袋中拿出一百个球,做上标记后放回布袋中混合均匀,若再从中任意摸出30个球,统计发现有标记的球有10个,则布袋中乒乓球数可能有()A.200个B.300个C.400个D.500个8.如图是某几何体的三视图,这个几何体是()A.三棱柱B.三棱锥C.长方体D.正方体9.如图所示,反比例函数(,)的图象经过矩形OABC的对角线AC的中点D.若矩形OABC的面积为等于8,则k的值等于()A.1 B.2C.3 D.410.如图,以点O为支点的杠杆,在A端用竖直向上的拉力将重为G的物体匀速拉起,当杠杆OA水平时,拉力为F;当杠杆被拉至OA1时,拉力为F1,过点B1作B1C⊥OA,过点A1作A1D⊥OA,垂足分别为点C、D.在下列结论中:①;②OA•OC=OB•OD;③OC•G=OD•F1;④F=F1,正确的是()A.①②④B.②③④C.①②③D.①②③④11.如图是二次函数y=a+bx+c(a,b,c是常数,a)图象的一部分,与x轴的交点A在点(2,0)和(3,0)之间,对称轴是x=1,对于下列说法:①ab,②2a+b=0,③3a+c,④a+b m(am+b)(m为实数)⑤当-1,y其中正确的是()A.②③④B.①②⑤C.①②④D.③④⑤12.如图,正方形ABCD中,BE=EF=FC,CG=2GD,BG分别交AE、AF于M、N,下列结论:①AF ⊥BG;②;③;④,其中正确的有()A.①②③B.②③④C.①②④D.①③④二、填空题13.如图,在△ABC中,点D、E分别在边AB、AC上,DE∥BC,如果AB=12,BC=9,AC=6,四边形BCED的周长为21,那么DE的长为____.14.如图,在△ABC中,点D、E分别在边AB、AC上,∠AED=∠B,如果AD=2,AE=3,CE=1,那么BD长为____.15.如图,在菱形ABCD中,对角线AC,BD相交于点O,H为BC中点,AC=6,BD=8,则线段OH 的长为_____.16.若实数,满足,,则的值为________.17.如图,四边形ABCD是正方形,AB=1,以AB为对角线作第二个正方形AEBF,以EB为对角线作第三个正方形EGBH,以此类推,则第n个正方形的面积是_______ .18.如图,将矩形ABCD沿DE折叠,使A点落在BC上的F处,若∠EFB=60°,则∠CFD=_____.19.如图1,在中,,点以每秒的速度从点出发,沿折线运动,到点停止.过点作于点,的长与点的运动时间(秒)的函数图象如图2所示.当点运动秒时,的长是_____.20.河北省赵县的赵州桥的桥拱是近似的抛物线,建立如图所示的平面直角坐标系,其函数表达式为y=-,当水面离桥拱的高度DO是4m时,这时水面宽度AB为______m三、解答题21.钟南山院士谈到防护新型冠状病毒肺炎时说:“我们需要重视防护,尽量呆在家,勤洗手,多运动,多看书,少熬夜.”重庆实验外国语学校为鼓励学生抗疫期间在家阅读,组织八年级全体同学参加了疫期居家海量读书活动,随机抽查了部分同学读书本数的情况统计如图所示.(1)本次共抽查学生______人,并将条形统计图补充完整;(2)读书本数的众数是______本,中位数是_______本.(3)在八年级2000名学生中,读书15本及以上(含15本)的学生估计有多少人?(4)在八年级六班共有50名学生,其中读书达到25本的有两位男生和两位女生,老师要从这四位同学中随机邀请两位同学分享读书心得,试通过画树状图或列表的方法求恰好是两位男生分享心得的概率.22.如图所示,已知A(-4,1),B(1,n)是一次函数y=kx+b的图象和反比例函数y=的图象的两个交点(1)求反比例函数和反比例函数的解析式(2)根据图象直接写出的解集23.疫情复学后学校为每个班级买了免洗抑菌洗手液,当购买量不超过100瓶时,洗手液的单价为8元;超过100瓶时,每增加10瓶,每瓶单价就降低0.2元,但最低价格不低于每瓶5元,设学校共买了x瓶洗手液(1)当x=80时,每瓶洗手液的价格是____元;当x=150时,每瓶洗手液的价格是___元;当x=____时,每瓶洗手液的价格恰好降为5元(2)若学校共花费1200元,请问一共购买了多少瓶洗手液?24.如图,在ACB中,AB=AC,点E在边BC上移动(点E不与点B,C重合),满足∠DEF=∠B,且点D,F分别在边AB,AC上.(1)求证:BDE∽CEF;(2)当点E移动到BC的中点时,且BD=3,CF=2,则的值为.25.如图,在Rt△ABC中,∠BAC=90°,AD是边BC上的中线,过点A作AE BC,过点D作DE AB,DE与AC,AE分别交于点O,E,连接EC.(1)求证:四边形ADCE是菱形;(2)若AB=AO,OD=1,则菱形ADCE的周长为.26.数学实践课上,同学们分组测量教学楼前国旗杆的高度.小明同学所在的组先设计了测量方案,然后开始测量了.他们全组分成两个测量队,分别负责室内测量和室外测量(如图).室内测量组来到教室内窗台旁,在点处测得旗杆顶部的仰角为45°,旗杆底部的俯角为60°.室外测量组测得的长度为5米,求旗杆的高度.27.综合与探究如图,已知点B(3,0),C(0,-3),经过B.C两点的抛物线y=x2-bx+c与x轴的另一个交点为A.(1)求抛物线的解析式;(2)点D在抛物线的对称轴上,当△ACD的周长最小时,求点D的坐标;(3)已知点E在第四象限的抛物线上,过点E作EF//y轴交线段BC于点F,连结EC,若点E(2,-3),请直接写出△FEC的面积;(4)在(3)的条件下,在坐标平面内是否存在点P,使以点A,B,E,P为顶点的四边形是平行四边形?若存在,请直接写出点P的坐标;若不存在,请说明理由.。
山东省滕州市张汪二中2020-2021学年度第一学期周末提优卷九年级数学试题(12月11日)
山东省滕州市张汪二中2020-2021学年度第一学期周末提优卷九年级数学试题(2020年12月11日)一、单选题1.已知△ABC中,角A,B,C所对的边分别为a,b,c,若∠C=90°,则a:b:c为( ) A.B.C.D.1:2:32.的倒数为()A.2 B.C.D.3.如图,四边形中,,,,分别为,的中点,则()A.B.2 C.D.4.小明在某个斜坡上,看到对面某高楼上方有一块宜传“中国国际进口博览会”的竖直标语牌.小明在点测得标语牌顶端D处的仰角为,并且测得斜坡的坡度为(在同一条直线上),已知斜坡长米,高楼高米(即米),则标语牌的长是()米.(结果保留小数点后一位)(参考数据:,,,)A.B.C.D.5.如图,港口在观测站的正东方向,,某船西东从港口出发,沿北偏东方向航行一段距离后到达处,此时从观测站处测得该船位于北偏东的方向,则该船航行的距离(即的长)为()A.B.C.D.6.如图,在四边形,分别是中点,若,则()A.B.C.D.7.如图,在中,,点的坐标是将绕点顺时针旋转,得到则点的对应点的坐标是()A.B.C.D.8.如图,△ABC中,∠C=90°,BC=2AC,则cos A=()A.B.C.D.9.如图,在菱形ABCD中,DE⊥AB,cos A=,则cos∠DBE的值是()A.B.C.D.10.如图,一艘轮船从位于灯塔C的北偏东方向,距离灯塔60海里的小岛A出发,沿正南方向航行一段时间后,到达位于灯塔C的南偏东方向上的B处,这时轮船B与小岛A的距离是( )A.海里B.海里C.120海里D.60海里11.在△ABC中,若,则∠C的度数是()A.45°B.60°C.75°D.105°12.周末小李带妹妹游览校园,如图所示,在学校门口点观察到刻有校名的牌坊底部的仰角为24°,牌坊顶部的仰角为39°,测得斜坡的坡面距离,斜坡的坡度.则牌坊的高度是()米.(参考数据,,;,;结果保留到0.1)A.11.7 B.12.8 C.15.6 D.24.0二、填空题13.在Rt△ABC中,若∠C=90°,cosA=,则sinA=________.14.在直角三角形ABC中,角C为直角,锐角A的余弦函数定义为_____,写出sin70º、cos40º、cos50º的大小关系__________.15.小明在热气球上看到正前方横跨河流两岸的大桥,并测得、两点的俯角分别为45°、35°.已知大桥与地面在同一水平面上,其长度为,求热气球离地面的高度_________.(结果保留整数)(参考数据:,,)16.如图,中,,将绕点顺时针旋转得到,若点正好在的延长线上,则的值为___________.17.如图,赵爽弦图是由四个全等的直角三角形与中间的小正方形拼成的一个大正方形,若S正方形ABCD∶S正方形EFGH=9∶1,则=____________.18.如图,矩形ABCD中,点E在边AB上.将矩形ABCD沿直线DE折叠,点A恰好落在边BC的点F 处.若AE=10,BF=6,则tan∠ADE=_____.三、解答题19.计算:2cos60°+﹣(π﹣3.14)0+(﹣1)2020.20.甲、乙两位同学要测量某铜像的高度.他们分别在A,B两处用高度为1.8m的测角仪测得铜像顶部C的仰角分别为30º,60º,两人间的水平距离AB为10m,求该铜像的高度CF(结果保留根号).21.良好的坐姿习惯有利于青少年骨骼生长,有利于身体健康,那么首先要有正确的写字坐姿,身体上半部坐直,头部端正、目视前方,两手放在桌面上,两腿平放,胸膛挺起,理想状态下,如图①,将图①中的眼睛记为点,腹部记为点,笔尖记为点,且与桌面沿的交点记为点,已知,点到的距离为23cm,.(1)求的度数(2)老师发现小亮同学写字姿势不正确,眼睛倾斜到图2的点,点恰好在的垂直平分线上,且,于是要求其纠正为正确的姿势,求眼睛所在的位置上升的距离(结果精确到1cm)22.如图,矩形中,,,点在边上,与点、不重合,过点作的垂线与的延长线相交于点,连结,交于点.(1)当为的中点时,求的长;(2)当是以为腰的等腰三角形时,求.。
山东省枣庄滕州市2020-2021学年人教版九年级(上)期末物理复习试卷(word版有答案)
2020-2021学年人教版九年级(上)期末物理复习试卷(word版有答案)一、单选题(本大题共14小题,共28分)1.中华美食文化博大精深,如图,通过煎、炒、蒸、拌烹调的四种美食中所包含的物理知识,认识正确的是()A. 煎:煎锅一般用铁制造,主要是利用了铁的比热容大B. 炒:主要是通过做功的方式使辣椒和肉片的内能增加C. 蒸:通过热传递和高温水蒸气液化放热,将饺子蒸熟D. 香菜和豆腐要拌着才能入味,说明分子没有做无规则运动2.如图所示,甲、乙是两个演示实验的示意图,丙、丁是四冲程汽油机工作过程中的两个冲程示意图.下列说法正确的是()A. 丙图所示的是做功冲程,其工作原理如甲图所示的实验B. 丙图所示的是压缩冲程,其工作原理如乙图所示的实验C. 丁图所示的是压缩冲程,其工作原理如甲图所示的实验D. 丁图所示的是做功冲程,其工作原理如乙图所示的实验3.下列说法正确的是()A. 拿一根玻璃棒与丝绸摩擦,则玻璃棒带上负电B. 电热水壶的电热丝可以用超导材料制成C. 加在导体两端的电压越大,则导体的电阻也越大D. 秋天用塑料梳子梳理干燥的头发时,头发会随着梳子飘起,这是摩擦起电现象4.关于温度、热量、内能,下列说法正确的是()A. 物体内能减小时,不一定是物体放出了热量B. 物体吸收了热量,它的温度一定升高C. 质量相同时,温度升高较多的物体吸收的热量一定多D. 相互接触的两个物体,热量总是从内能多的物体传向内能少的物体第1页,共34页5.A、B两物体质量相等,温度均为10℃;甲、乙两杯水质量相等,温度均为50℃.现将A放入甲杯,B放入乙杯,热平衡后甲杯水温降低了4℃,乙杯水温降低了8℃,不考虑热量的损耗,则A、B两物体的比热容之比为()A. 4:9B. 3:5C. 2:3D. 1:26.如图所示,电源电压保持不变,开关S闭合或者断开时,有一种状态是灯L1、L2刚好都能正常发光,甲、乙两个电表的示数之比是2:3,此时灯L1、L2的电阻之比是()A. 1:2B. 2:1C. 2:3D. 3:27.如图所示是探究电流与电阻的关系”的实验电路图,当A.B间的电阻由10Ω换成15Ω后,闭合开关,接下来正确的实验操作应该是()A. 观察电流表,向右移动滑片,让电流表示数保持不变读取电压数据B. 观察电流表,向左移动滑片,让电流表示数保持不变读取电压数据C. 观察电压表,向左移动滑片,让电压表示数保持不变读取电流数据D. 观察电压表,向右移动滑片,让电压表示数保持不变读取电流数据8.在如图所示的电路中,电源电压保持不变,闭合开关S,滑动变阻器的滑片P向左滑动时,下列判断正确的是()A. 电流表的示数减小,电压表的示数增大B. 电流表的示数增大,电压表的示数减小C. 定值电阻R消耗的功率增大D. 电路消耗的总功率不变9.中国的传统节日与美食相对应,在下列美食制作、烹饪或食用中,解释不正确的是()A. 春节--包饺子时力的作用使饺子皮发生了形变B. 端午节--粽子飘香是分子无规则运动的结果C. 中秋节--月饼吃掉一半后质量和密度都减半D. 元宵节--漂浮在水面的汤圆所受的重力与浮力是一对平衡力10.如图甲所示,电源电压保持不变,闭合开关时,滑动变阻器的滑片P从b端滑到a端,电压表示数U与电流表示数I的变化关系如图乙所示,下列说法正确的是()A. 电源电压是12VB. 定值电阻R的阻值是6ΩC. 滑动变阻器的阻值范围是0~18ΩD. 若定值电阻R断路时,电流表示数为0,电压表示数为0V11.如图所示,在探究并联电路中的电流关系时,小明同学用电流表测出A、B、C三处的电流分别为I A=0.4A、I B=0.2A、I C=0.2A,在表格中记录数据后,下一步应该做的是()A. 整理器材,结束实验B. 分析数据,得出结论C. 换用不同规格的小灯泡,再测出几组电流值D. 换用电流表的另一量程,再测出一组电流值12.用电压表测L1、L2小灯泡两端电压,如图所示的四种电路中,正确的是()A. B.C. D.第3页,共34页13.用“伏安法测电阻”的实验中,小雪和晓彤分别选用定值电阻和小灯泡为测量对象,在处理实验数据时,分别画出了U−I的图象,如图甲、乙所示。
2020-2021学年山东省枣庄市滕州市九年级(上)期末物理试卷(Word+答案)
2020-2021学年山东省枣庄市滕州市九年级(上)期末物理试卷一、选择题(每小题只有一个选项正确,每小题3分,共48分;答案填涂在答题卡中相应位置)1.(3分)物理与生活密切相关,下列数据符合实际的是()A.人体的安全电压是36VB.一节5号干电池的电压是1.5VC.家用微波炉的功率约为80WD.人体感觉舒适的环境温度约为37℃2.(3分)关于如图所示的情景,下列说法正确的是()A.甲图是内燃机做功冲程的示意图,做功冲程能为汽车提供动力B.乙图中抽出玻璃板,下面的瓶中出现二氧化氮气体,表明气体间可以发生扩散C.丙图中钩码不能把两块铅块分开,说明分子间只存在引力D.丁图中瓶塞被推开,说明内能可转化为机械能,与热机压缩冲程工作原理相同3.(3分)教室里,一个开关控制两盏电灯,若一盏灯出现断路,不影响另一盏灯的工作。
在图所示的四个电路中,正确反映电路连接关系的是()A.B.C.D.4.(3分)甲、乙为两个条形磁铁的两个磁极,根据图所示的小磁针静止时的指向,可以判断()A.甲是N极,乙是S极B.甲、乙都是N极C.甲、乙都是S极D.甲是S极,乙是N极5.(3分)有一种电动烤地瓜机,将地瓜放在托盘上,盖上锅盖相当于闭合开关S1,托盘旋转,再将温控开关S2闭合,开始加热;若只闭合开关S2,则不能加热。
下图中是托盘电动机,R是加热电阻,对其内部电路设计合理的是?()A.B.C.D.6.(3分)小明、小李和小红按各自设计的电路图进行实验,并将实验数据记录在表格中,如图所示。
其中电路图与实验数据对应的是)A.小明和小李B.小李和小红C.小明和小红D.都不对应7.(3分)如图所示,把由同种材料制成的长度相同,粗细不同的电阻丝并联接入电路中,其两端的电压、电流的关系是()A.U AB>U CD,I AB>I CD B.U AB=U CD,I AB<I CDC.U AB=U CD,I AB>I CD D.U AB=U CD,I AB=I CD8.(3分)如图甲所示是身高体重测量仪,当体检者站在台面上时,能自动显示身高和体重,电路原理如图乙所示,电压表、电流表分别显示身高和体重的大小,压敏电阻R的阻值随压力增大而增大,滑片P随身高增大而上滑。
2020-2021学年山东省滕州市 九年级第一学期数学期末模拟试题
九年级数学上期末模拟试题一、选择题1、将方程(x ﹣1)2=6化成一元二次方程的一般形式,正确的是( ) A .x 2﹣2x +5=0 B .x 2﹣2x ﹣5=0C .x 2+2x ﹣5=0D .x 2+2x +5=02.反比例函数y=的图象,当x >0时,y 随x 的增大而增大,则k 的取值范围是( )A. k <3B. k≤3C. k >3D. k≥3 3.如果3a =2b (ab ≠0),那么比例式中正确的是( ) A .=B .=C .=D .=4.有x 支球队参加篮球比赛,共比赛了21场,每两队之间都比赛一场,则下列方程中符合题意的是( ) A .x (x ﹣1)=21B .x (x +1)=21C .x (x ﹣1)=42D .x (x +1)=425、如图,在等边△ABC 中,D 为BC 边上一点,E 为AC 边上一点,且 ∠ADE=60°,BD=4,CE=43,则△ABC 的面积 为( ) A .83B .15C .93D .1236. 将抛物线y=3向上平移3个单位,再向左平移2个单位,那么得到的抛物线的解析式为( ) A. y=3B. y=3+3 C. y=3D. y=3-37.在Rt ABC ∆中,∠C=90,若3tan 4A =,则sin A 等于( ) A .43 B .34 C . 53 D .358、如图,等边△OAB 的边OB 在x 轴的负半轴上,双曲线过OA 的中点,已知等边三角形的边长是4,则该双曲线的表达式为( ) A .B .C .D .9.如图,阳光透过窗户洒落在地面上,已知窗户AB 高1.5m ,光亮区的顶端距离墙角3m ,光亮区的底端距离墙角1.2m ,则窗户的底端距离地面的高度(BC )为( ) A.1m B.1.2m C.1.5m D.2.4m第9题第10题第11题10. 如图是二次函数y=a +bx+c(a, b, c 是常数,a )图象的一部分,与x 轴的交点A 在点(2, 0)和(3,0)之间,对称轴是x=1, 对于下列说法:①ab②2a+b=0 ③3a+c④a+bm(m 为实数)⑤当-1, y其中正确的是( )A. ②③④B. ①②⑤C. ①②④D. ③④⑤ 11.如图,在第一象限内,(2,3)P ,(,2)M a 是双曲线ky x=(0k ≠)上的两点,过点P 作PA x ⊥轴于点A ,连接OM交PA 于点C ,则点C 的坐标为( )A.(2,1)B.32,4⎛⎫ ⎪⎝⎭C.22,3⎛⎫ ⎪⎝⎭ D.42,3⎛⎫⎪⎝⎭12.如图,已知边长为2 的正方形ABCD ,E 是AB 的中点,F 是BC 的中点,AF 与DE 相交于I ,BD 和AF 相交于H .则四边形BEIH 的面积为(A )45 (B )35(C )715 (D )815二、填空题13.已知点D 是线段AB 的黄金分割点,且线段AD 的长为18厘米,则最短线段BD 的长是 厘米. 14、如图,在平面直角坐标系中,点 A 在抛物线 y=x 2﹣2x+2 上运动.过点 A 作 AC ⊥x 轴 于点 C ,以 AC 为对角线作矩形 ABCD ,连结 BD ,则对角线 BD 的最小值为 .15.已知关于x 的一元二次方程2410kx x -+=有两个不相等的实数根,则k 的取值范围是__________. 16.如图,在菱形ABCD 中,AB =2,∠BAD =60°,将菱形ABCD 绕点A 按逆时针方向旋转,对应得到菱形AEFG ,点E 在AC 上,EF 与CD 交于点P ,则DP 的长是 . 17.抛物线y =ax 2+bx +c 上部分点的横坐标x 、纵坐标y 的对应值如下表:x … -2 -1 0 1 2 … y…4664…从上表可知,下列说法中正确的是_______________ (填写序号).(1)抛物线与x 轴的一个交点为(3,0);(2)函数y =ax 2+bx +c 的最大值为6;(3)抛物线的对称轴是x =0.5;(4)在对称轴左侧,y 随x 的增大而增大. 18.如图,已知直线y =﹣x +3分别交x 轴、y 轴于点A 、B ,P 是抛物线y =﹣x 2+2x +5上的一个动点,其横坐标为a ,过点P 且平行于y 轴的直线交直线y =﹣x +3于点Q ,则当PQ =BQ 时,a 的值是 .ABCDE F I H 第12题第14题第16题第18题三、解答题19.计算:20.已知一元二次方程mx2-2mx+m-2=0.(1)若方程有两个不等实数根,求m的取值范围;(2)若方程的两实数根为x1,x2,且|x1-x2|=1,求m的值.21.如图,有两个可以自由转动的转盘A、B,转盘A被均匀分成4等份,每份标上数字1、2、3、4四个数字;转盘B被均匀地分成6等份,每份分别标上1,2,3,4,5,6六个数字.有人为甲乙两人设计了一个游戏,其规则如下:(1)同时转动转盘A与B;(2)转盘停止后,指针各指向一个数字(如果指针恰好指在分割线上,那么重转一次,直到指针指向一个数字为止),用所指的两个数字作乘积,如果所得的积是偶数,那么甲胜,如果所得的积是奇数,那么乙胜.你认为这样的规则是否公平?请你说明理由;如果不公平,请你设计一个公平的规则,并说明理由.22.在矩形AOBC中,OB=6,OA=4,分别以OB,OA所在直线为x轴和y轴,建立如图所示的平面直角坐标系.F是边BC上一点(不与B,C两点重合),过点F的反比例函数y=kx(k>0)图象与AC边交于点E.(1)请用含k的代数式表示点E,F的坐标;(2)若△OEF的面积为9,求反比例函数的解析式.23.如图1是小志同学书桌上的一个电子相框,将其侧面抽象为如图2所示的几何图形,已知BC=BD=15cm, ∠CBD=40º, 则点B到CD的距离为多少cm? (参考数据:0.342,0.940,0.643,0.766,精确到0.1cm)24.如图,在锐角三角形ABC中,点D,E分别在边AC,AB上,AG⊥BC于点G,AF⊥DE于点F,∠EAF =∠GAC.(1)求证:△ADE∽△ABC;(2)若AD=3,AB=5,求的值.25.如图,抛物线经过A(﹣1,0),B(5,0),C(0,﹣)三点.(1)求抛物线的解析式;(2)在抛物线的对称轴上有一点P,使PA+PC的值最小,求点P的坐标.(3)点M为x轴上一动点,在抛物线上是否存在一点N,使以A,C,M,N四点构成的四边形为平行四边形?若存在,求点N的坐标;若不存在,请说明理由.备用图。
山东省枣庄市滕州市张汪中学九年级物理上学期期末试卷(含解析)
山东省枣庄市滕州市张汪中学九年级物理上学期期末试卷一、单选题1.关于内能、能量转化和守恒,下列说法不正确的是()A.做功改变物体的内能是不同形式的能的相互转化B.热传递改变物体的内能是不同形式的能的相互转化C.各种形式的能在一定条件下都可以相互转化D.能量在转移和转化过程中总会有损耗,但总量保持不变2.一箱汽油用掉一半后,剩下一半的哪个量也是原来的一半?()A.密度B.比热容C.热值D.质量3.如图所示,把热水壶放在煤气灶上烧水的过程中,下列说法正确的是()A.煤气的燃烧过程是内能转化为化学能B.壶口喷出来的白气是水蒸气C.水的温度越高,水分子运动的越剧烈D.烧水的过程是通过做功的方式改变水的内能4.在图所示电路中,电源电压保持不变,当开关S1闭合,S2断开时,电压表的读数是3V;当开关S1断开,S2闭合时,电压表的示数是5V,则S2断开时,灯L1和L2两端的电压分别为()A.2V和3V B.3V和2V C.2V和8V D.2V和5V5.在图(a)所示电路中,当闭合开关后,两个电压表指针偏转均为图(b)所示,则电阻R1和R2两端的电压分别为()A.4.8V,1.2V B.6V,1.2V C.1.2V,6V D.1.2V,4.8V 6.如图所示,要使开关S闭合后小灯泡能够发光,在金属夹A、B间应接入下列物品中的()A.橡皮B.钢直尺C.塑料尺D.干燥的小木棍7.如图所示,当开关S闭合后,两灯不亮,电压表有较大示数。
则下列说法中正确的是()A.灯L1的灯丝断了B.灯L1被短路了C.灯L2的灯丝断了D.灯L2被短路了8.如图所示电路,电源电压不变,R0为定值电阻,R为滑动变阻器。
闭合开关S,当滑片P 从a点滑到b点过程中,电流表的示数从I a变为I b.下列各图中,能表示这一过程中电压表示数U与电流表示数I之间关系的是()。
山东省滕州市张汪中学2020-2021学年度第一学期期中复习练习题九年级数学(无答案)
山东省滕州市张汪中学2020-2021学年度第一学期期中复习练习题九年级数学一、单选题1.方程的解是A.B.C.或D.或2.若2-是方程x2-4x+c=0的一个根,则c的值是()A.1 B.3-C.1+D.2+3.一元二次方程(x﹣1)(x+5)=3x+2的根的情况是()A.方程没有实数根B.方程有两个相等的实数根C.方程有两个不相等的实数根D.方程的根是1、﹣5和4.如图,△ABE和△CDE是以点E为位似中心的位似图形,已知点A(2,2)、B(3,1)、D(5,2),则点A的对应点C的坐标是()A.(2,3)B.(2,4)C.(3,3)D.(3,4)5.如图.AB∥CD∥EF,AF、BE交于点G,下列比例式错误的是()A.B.C.D.6.如图,点,,以原点O为位似中心,把线段AB缩短为原来的一半,得到线段CD,其中点C与点A对应,点D与点B对应,则点D的横坐标为()A.2 B.2或-2C.D.或-7.如图,,,以下结论成立的是()A.B.C.D.以上结论都不对8.若,则的值为()A.B.-1 C.1 D.9.在矩形中,点在上,,,垂足为,且,,则的值是()A.2 B.C.D.10.如图,在菱形中,,,为对角线的中点,过点作,垂足为.则下列说法错误的是()A.点为菱形的对称中心B.C.为等边三角形D.11.如图,已知正方形的边长为4,点分别在,上,,与相交于点,点为的中点,连接,则的长为()A.2 B.2.5 C.3 D.3.512.如图,已知正方形ABCD的边长为4,P是对角线BD上一点,于点E,于点F,连接AP,给出下列结论:①;②四边形PECF的周长为8;③一定是等腰三角形;④;⑤的最小值为其中正确结论的序号为( )A.①②④⑤B.①③④⑤C.②④⑤D.②③⑤二、填空题13.如图,在矩形中,,交于点,、分别为、的中点.若,则的长为______.14.如图,在Rt△ABC中,∠ACB=90°,点D、E、F分別为AB,AC,BC的中点,若CD=5,则EF的长为_____.15.已知,则_________.16.设,是方程的两个实数根,则的值为______.17.如图,在矩形中,点是边上一点,连结,将沿对折,点落在边上点处,与对角线交于点,连结.若,.则______.18.如图,平行于BC的直线DE把△ABC分成的两部分面积相等.则= .三、解答题19.解下列方程:(1);(2).20.已知关于的一元二次方程的两个根分别为,,利用一元二次方程的求根公式可得:,,利用上述结论来解答下列问题:(1)已知的两个根为,,则______,______;(2)已知关于的一元二次方程有两个实数根,,若,求的值.21.某商店将进价为8元的商品按每件10元售出,每天可售出200件,如果这种商品每件的销售价每提高0.5元其销售量就减少10件,问:(1)应将每件售价定为多少元时,才能使每天利润为640元?(2)店主想要获得每天800元的利润,小红同学认为不可能.如果你同意小红同学的说法吗?(说明理由)22.如图,、为的高,且与交于点.(1)求证:;(2)若,求的度数23.如图,,DB平分∠ADC,过点B作交AD于M.连接CM交DB于N.(1)求证:;(2)若,求MN的长.24.如图,O为∠BAC内一点,E、F、G、H分别为AB,AC,OC,OB的中点.(1)求证:四边形EFGH为平行四边形;(2)当AB=AC,AO平分∠BAC时,求证:四边形EFGH为矩形.25.如图,在中,、分别平分与它的邻补角,于点,于点,直线分别交、于点、.(1)求证:四边形为矩形.(2)试猜想与的关系,并证明你的猜想.(3)如果四边形是正方形,试判断的形状(直接写出结果,不用说明理由).。
2020-2021学年山东省滕州市张汪二中第一学期期末复习诊断性练习九年级英语
一、完型填空The world we live in is becoming a "village". Every day, thousands of people go to _______ countries. They are going sightseeing, studying, working or doing volunteer jobs. Perhaps in the _______ future, you will also be one of these people.Living in a foreign country is _______. You can see beautiful scenery, taste many kinds of food and meet people from other backgrounds. Most importantly of all, you can live a new lifestyle and maybe even _______ a part of the local culture.Your thoughts change. You might find French people are not _______ "romantic". Besides, you can find _______ don't eat McDonald's all the time. And you _______ illness if you are bitten by a mosquito (蚊子)in Africa. Also, culture shock might hit you. Not _______ thinks like you or does things the way you do. Their tea doesn't taste like yours. They don't talk excitedly in restaurants. It is not better or _______. It is just not the same. What you can do is to open up your mind, take in the differences and respect them.It's better ________ open to new experiences. That's why we go to new places.1.A.difference B.different C.differently D.differences2.A.near B.nearly C.far D.farther3.A.excited B.excitement C.exciting D.excitedly4.A.becoming B.became C.become D.becomes5.A.always B.seldom C.hardly ever D.never6.A.America B.American C.Americans' D.Americans7.A.didn't get B.haven't gotten C.won't get D.aren't getting8.A.anybody B.everybody C.somebody D.nobody9.A.bad B.badly C.worse D.worst10.A.to be B.being C.is D.are二、阅读单选Clothes are traditionally made of natural materials, such as cotton, leather and wool. They are all from plants or animals, but that doesn't mean they're friendly to the earth. For example, farmers have to use a lot of chemicals to grow cotton plants.Scientists are now looking for new ways to make clothing materials. They hope the new materials are both comfortable and good for the earth. Scientists have worked out how to make materials out of corn husks(玉米皮), chicken feathers and rice straws."They used to be useless things. We always have a problem of how to deal with them," Yang, a scientist says, "Now, we can turn them into beautiful materials. Chicken feathers are better than other things. They have small air pockets like honeycombs. That means it will be very warm if you use them to make a jacket or sweater, and I think more and more people will like to buy these kinds of clothes."11.Clothes are traditionally made of _________.A.natural materials B.chicken feather C.rice straws D.corn husks12.What are the things that the scientists are using to make new clothing materials?A.Leather and corn husks. B.Leather and rice straws.C.Corn husks and rice straws. D.Rice and chicken feathers.13.What does the underlined word "honeycomb" in Paragraph 3 mean in Chinese?A.鸟巢B.蜂窝C.渔网D.梳子14.According to the passage, chicken feathers are better than other materials because they are ________.A.light B.cheap C.clean D.warm15.What's the best title of this passage?A.New Clothing Materials B.New Clothes C.Natural Materials D.Clothes Beijing Opera appeared in the Qing Dynasty(朝代). In 1790, many opera troupes(戏班)went to Beijing for performances to celebrate the birthday of Qianlong. This kind of unusual performance touched the hearts of the people deeply. While in Beijing, the troupes created a new kind of opera called Beijing Opera. It was on the basis(基础)of Anhui Opera by taking in the advantages of other operas.Beijing Opera is quite unique(唯一的)in role shaping because it divides the roles into different kinds. They are sheng, dan, jing and chou which are quite different in many ways.A popular song goes like this, “Foreigners call Jingxi Beijing Opera.”In fact, Beijing Opera is different from opera. Opera tells the story and expresses the thoughts by singing instead of speaking. But Beijjing Opera stresses(强调)chang, nian, zuo and da. Chang means singing; nian means musical spoken parts; zuo means dance movements and da means martial(武打)skills.Mei Lanfang is an excellent performing artist of Beijing Opera in China. In 1930, he led an opera troupe to America and presented Beijing Opera before western people. Today, Beijing Opera has become the sign of Chinese culture. It is changing with the development of different musical styles.16.Beijing Opera appeared in the ________Dynasty.A.Song B.Yuan C.Ming D.Qing17.Beijing Opera was created by ________.A.performing in Beijing B.touching the hearts of the peopleC.celebrating Qialong’s birthday D.taking in the advantages of other operas18.There are four important kinds of ________in Beijing Opera.A.roles B.styles C.shapes D.signs19.In Beijing Opera, _________means dance movements.A.nian B.zuo C.da D.chang20.Which of the following is RIGHT?A.Beijing Opera is the same as opera.B.Opera expresses the thoughts by speaking.C.Beijing Opera has never changed until now.D.Mei Lanfang thought Beijing Opera to the world.Devon Gallagher, a college graduate from Philadelphia, wants the world to know exactly where she’s been during her worldwide vacation in a special way.The traveler, who was born with a congenital bone disease(先天性骨病), lost her right leg at the age of four. Although she had a hard time at first, she now thinks that nothing can stop her living her best life.To spread that message, Gallagher shares photos of her travels around the world online, and writes her location across her artificial leg(假肢)before taking a picture. Now she has been taking pictures across Europe, all with the well-known locations written on her artificial leg.“I get a new leg every two years and I can choose the design(设计)on it. One day I had a sudden thought to get a chalkboard,”Gallagher said. “My mum and grandmother didn’t like the idea, but my friends liked it and told me to go for it, so I did.”Gallagher said people often stared when she was writing on her leg. But once she shared the photos, she received only positive feedback(正面反馈). “My leg hasn’t stopped me from doing anything I’ve wanted to do,and I’ve been able to keep up with my peers(同龄人)and lead a pretty great life.”Gallagher shows us that you should never let anything stand in the way of your dreams. And if you run into difficulties, get creative with it because if life gives you an artificial leg, make art.21.Gallagher has only one leg because she________A.was born with one leg B.got hurt at collegeC.had a car accident at the age of 4 D.had a congenital bone disease22.A (n) ________is written on Gallagher’s artificial leg each time she takes a pictures.A.disease B.location C.message D.idea23.Gallagher has been sharing pictures to________.A.help her friends to spread the messageB.make her mum and grandmother happyC.tell the world how wonderful her vacation isD.show that nothing can stop her living her best life24.When people saw Gallagher’s pictures, they________A.didn’t like her idea B.gave her positive feedbackC.laughed at her dream D.helped her choose the design of her leg25.The best title of the passage is________A.The secret to success B.Face difficulties with a smileC.Wonderful photos D.A vacation to remember三、补全短文7选5It was a fine day. Sherlock Holmes invited his best friend Doctor Watson to go camping with him. They found a nice hill and put up their tent. Then they went fishing and climbed the hill. 26.They began to chat happily.“Watson, look up into the sky and tell me what you can see.”said Holmes.“27.”Watson replied.Holmes asked again, “What does that tell you?”Watson thought for a while. “It tells me that there are tons of galaxies(星系)and planets.”Holmes continued asking, “28.”Watson smiled. “It tells me that God is great and powerful. At the same time, 29.”“Oh, I think so. Is that all?”asked Holmes.“No, as for the weather, 30.What does it tell you?”Watson said.Holmes laughed. “Someone has stolen our tent.”A.They went to sleep early.B.humans are tiny.C.At the end of the day, the two friends lay down on the grass for night.D.it will be a sunny day tomorrow.E.What else does it tell you?F.It was raining hard when they got to the top of the hill.G.I can see millions of stars in the sky.四、单词填空Pushing myself to the limit makes me feel greatLots of junior high school students enjoy sports. My classmates and I had a lot of fun at our school's annual (一年一度的)sports meeting last week.It was pretty special for me because I participated(参加)in the 800-meter race for the first time. 31.(尽管)I ran hard every day, I was still 32.(担忧的)on the day of the meeting.五、完成句子41.这个电脑公司向研究中心捐赠了五百万元。
2020-2021学年山东省枣庄市滕州市张汪中学九年级(上)期末化学模拟试卷含解析
2020-2021学年山东省枣庄市滕州市张汪中学九年级(上)期末化学复习模拟试卷一、选择题(共12小题,每小题3分,满分36分)1. 生活中有太多的变化,下列“变”中涉及化学变化的是()A.树根“变”根雕B.葡萄“变”美酒C.玉石“变”印章D.玩具机器人“变”形2. 下列物质由分子构成的是()A.蒸馏水B.氯化钠C.氦气D.锌3. 下列事实的结论或解释中错误的是()A.水烧开后易把壶盖冲起--说明温度升高分子会变大B.公园的桂花开放时满园飘香--说明分子在不断运动C.酸碱中和反应都能生成水--实质是与结合生成了D.加碘食盐和铁强化酱油--都可以补充人体必需的微量元素4. 下列有关原子结构的说法中正确的是()A.氯原子的结构示意图为,在反应中若得到一个电子即变成氯离子B.“毒大米”中含有金属铬,铬的原子序数为,则中子数和质子数都为C.氢、碳、氧的原子核都由质子和中子构成D.质子和中子的相对质量都约等于,每个质子、中子都带个单位正电荷5. 蒸馏水不能养鱼的原因是因为缺少()A.氢元素B.氧元素C.氧原子D.氧分子6. 甲醛的化学式是,某甲醛水溶液里甲醛分子中所含的氢原子数与水分子中所含的氢原子数目相等,则该溶液中溶质的质量分数为()A. B. C. D.7. 年月日,“嫦娥一号”卫星发射成功。
发射前小时开始向运载火箭加注液氧和液氢。
其中液氧是()A.助燃剂B.燃料C.冷却剂D.催化剂8. 常用于在接触法制硫酸过程中产生,其化学方程式为:,则的化学式为()A. B. C. D.9. 在一个密闭容器中放入甲、乙、丙、丁四种物质,在一定条件下发生化学反应,一段时间后,测得有关数据如表:物质甲乙丙丁反应前质量反应后质量(未知)下列说法中,不正确的是()A.反应后物质甲的质量为B.反应中乙、丁的质量比为C.乙是反应物D.物质丙可能是该反应的催化剂10. 在的反应中,和恰好安全反应生成,同时得到的质量是()A. B. C. D.11. 为了探究二氧化碳的性质,小明同学进行如图所示的实验.你认为该实验能说明的是()A.二氧化碳的密度比空气大B.二氧化碳能支持燃烧C.二氧化碳能供呼吸D.二氧化碳能燃烧12. 雅安地震发生后,为确保大灾之后无大疫,灾区使用了大量的消毒剂.工业上制取的原理之一是:.下列有关说法正确的是()A.上述反应属于复分解反应B.中氯元素和氧元素的质量比为C.的化学式为D.上述反应的生成物都是由分子构成的二、非选择题:如图是种粒子的结构示意图.请按要求回答问题.(1)写出下列粒子的化学符号::________,:________;(2)易失电子的粒子是________(填序号,下同);化学性质相似的一组原子是________.(3)写出形成物质的名称:________.氮气、氧气、二氧化碳、二氧化硫、氢气等五种气体中,按要求将相应物质的化学式填写在题中的空白处:(1)属于空气污染物的气体是________.(2)能做燃料的气体是________.(3)焊接金属时常用作保护气的是________.(4)绿色植物光合作用吸收的气体是________.(5)用作医疗救护的气体是________.多彩的“碳”,多姿的生活,让我们一起走进“碳”的世界(1)根据如表提供的信息,填写有关含碳物质的对应特性.物质用途石墨作电极金刚石切割玻璃对应性质(2)液态二氧化碳灭火器可用于扑救档案资料室发生的火灾,下列说法正确的有________ (填字母).A.液态二氧化碳气化时吸热,降低了周围的温度B.二氧化碳不能燃烧,也不能支持燃烧C.液态二氧化碳气化后不会污染档案资料(3)天然气的主要成分是甲烷,它是一种“清洁能源”.甲烷在空气中燃烧生成二氧化碳和水,写出甲烷燃烧的文字或符号表达式________,过多的二氧化碳会引起________ 效应,为了减缓大气中二氧化碳含量的增加,以下建议合理的是________ (填序号).①开发太阳能、水能、风能、地热等能源;②减少化石燃料的使用;③大量植树种草,禁止乱砍滥伐.柠檬酸亚铁是重要的含铁试剂,兴趣小组制取柠檬酸亚铁溶液的实验流程如图:(1)写出反应的化学方程式:________,该反应属于基本反应类型中的________反应;(2)操作的名称为________;(3)写出反应的化学方程式:________;(4)反应中会有气体生成,该气体是________;(5)柠檬酸亚铁的化学式为,柠檬酸亚铁中铁元素和碳元素质量比为________.、、、、已学过的五种常见物质,其中有四种气体,、是空气的主要成分,将物质通直流电可得到和、和常温能发生化合反应,由此可以判断:(1)写出物质化学式:________、________.(2)和混合点燃可能发生爆炸,该反应用化学式表示为________.(3)用一种物质将、、三种物质区别开来,你选用的物质是________.、、、、、、、八种物质,有如图所示关系,“”表示可以向箭头所指方向转化,通常情况下是一种无色液体,是一种黑色固体,是一种能使澄清石灰水变浑浊的气体,在②的反应前后的质量和化学性质都不改变.试推断:(1)写出物质的名称:________;(2)写出反应①、②、③的符号表达式:①________;②________;③________.(3)上述反应中属于分解反应的是________ (填序号).根据下图所示装置回答问题(装置图用序号表示):(1)双氧水是一种无色液体,可发生如下反应:.在实验室利用此反应制取氧气时,应选用的气体发生装置是________.(2)实验室用大理石和盐酸反应制取二氧化碳,在生成的气体中常混有少量氯化氢和水蒸气.装置用于除掉水蒸气,可选用________做干燥剂(填名称).利用装置除掉氯化氢时,选择的试剂是饱和溶液,已知与反应生成、、.请写出该反应的化学方程式________.(3)将制取二氧化碳的装置按发生、净化和收集的顺序进行连接,生成的气体通过净化装置导管口的先后顺序是________(填导管接口序号).实验室有一瓶含有硫酸的废液,老师请小红同学设计方案测定该废液中硫酸的溶质质量分数.小红同学先取一洁净小烧杯,称其质量为,然后往其中倒入少量硫酸废液后称量,总质量为,之后,将一枚质量为的铁钉(已用砂纸打磨去掉铁锈)放入该小烧杯中反应,待铁钉表面不再有气泡产生后,再次称量,总质量为.请回答下列问题:(1)写出上述反应的化学方程式:________.(2)反应中产生的气体的质量是________ .(3)计算该废液中硫酸的质量分数.(4)如果铁钉的铁锈未除净,对计算结果的影响是________ (选填“偏大”、“偏小”、“无影响”),原因是________.参考答案与试题解析一、选择题(共12小题,每小题3分,满分36分)1.【答案】B【考点】化学变化和物理变化的判别【解答】、树根“变”根雕过程中只是形状发生改变,没有新物质生成,属于物理变化。
山东省滕州市2020-2021学年度张汪中学第一学期期中复习九年级unit1过关英语试题
【市级联考】山东省滕州市2020-2021学年度张汪中学第一学期期中复习九年级unit1过关英语试题学校:___________姓名:___________班级:___________考号:___________一、单选题1.We often do lots of experiments in our ________ classes.A.chemical B.history C.Chinese D.physics 2.You should be ________.Improving your English needs time.A.lazy B.careful C.patient D.active3.I found ________ very easy to learn English well if you put your heart into it.A.that B.what C.it D.this4.It's important ________ English well.A.of us to learn B.for us to learn C.of us learning D.for us learning 5.I love reading books because I can have much ________ from them.A.food B.knowledge C.money D.grammar 6.—________ did you achieve your dream?—By working hard,of course.A.When B.Why C.How D.What7.My English teacher gives me some advice on how to improve my listening _______. A.course B.preparation C.ability D.choice8.My brother often makes mistakes ________ grammar.A.of B.by C.at D.in 9.Please tell me ________.A.how to do B.what to do C.where to do D.do what 10.It’s ______ to watch ________movies.A.fun, funny B.fun, fun C.funny, funny D.funny, fun二、完型填空I was tired. I had been studying English for 8 years, but my spoken English was terrible. I went to English school every night. I 11 different textbooks and learned the grammar rules 12 them every day. But during the eight years, I hadn’t got any13 at all!Being tired of school, I searched the Internet for “Learn English” one night. Then I found a14 English learning system.Seven days later I started using the system to learn English. My life 15 from then on. I used the system every day. I was 16 to find that learning English in this way was so easy and interesting. No boring grammar rules. The articles were interesting and the stories were funny.Then something amazing happened. One day I 17 an American man named James in a coffee shop. Without thinking, I started to 18 him. My English words came out automatically(无意识地).It was hard for me to believe it. I could speak English so easily. I didn’t feel any19 or worry. James understood my ideas and feelings. We talked for two hours without 20 .Then we exchanged e-mails and Skype IDs. We decided to talk to each other on the Internet every week.My English has improved greatly now. I think there are many ways of learning English for us to use. You should stop using a way that doesn’t workand find out what is helpful to you.11.A.met B.saw C.read D.looked12.A.by B.in C.for D.about13.A.message B.mistake C.progress D.challenge14.A.boring B.common C.disappointing D.perfect 15.A.changed B.started C.solved D.impressed16.A.afraid B.angry C.crazy D.surprised17.A.met B.beat C.helped D.forgot18.A.wait for B.talk with C.laugh at D.think of19.A.interest B.hobby C.stress D.idea20.A.saying B.predicting C.stopping D.understanding三、阅读单选Reading is a good habit, but the problem is, there’s too much to read these days, and t oo little time to read every word of it. There are hundreds of skills to help you read more in less time. Here are two skills that I think are especially good.Preview—if it’s long and hard. Previewing is especially useful for getting a general idea of heavy reading like long magazine articles and business reports.Here’s how to preview.◆Read the first two paragraphs and the last two paragraphs carefully.◆Then read only the first sentence of the other paragraphs.Previewing doesn’t give you all the det ails. It keeps you from spending time on things you don’t really want or need to read.Skim—if it’s short and simple. Skimming is a good way to get a general idea of light reading like popular magazines or the sports and entertainment of your daily paper.Here’s how to skim.◆Get your eyes to move fast. Sweep them across each line.◆Pick up only a few key words in each line.Everybody skims differently. You and I may not pick up the same words when we skim the same piece, but we’ll get a similar idea of what it’s all about.21.How many skills are given in this passage?A.One., B.Two., C.Three., D.Four.22.What does the underlined word “preview” mean in Chinese?A.精读, B.默读, C.朗读, D.略读23.What should we NOT do when we read sports news in a daily paper according to the passage?A.Read the last two paragraphs carefully.B.Get our eyes to move fast.C.Sweep our eyes across each line.D.Pick up only a few key words in each line.24.Which of the following is WRONG?A.Skim means reading quickly. I t’s a good way to read.B.There are a lot of ways for you to read more in less time.C.By previewing you can get all the details of the passage.D.People can spend less time doing more reading.25.What is the best title for this passage?A.How to read faster, B.What to readC.When to read, D.Why we should readA good reader is much like a driver. He can change his reading speed to fit his purpose and the material(材料) he is reading, just like a driver does to fit the road situation. Agood reader may read a thousand words per minute (WPM), but he won't keep that speed for everything he reads. A good reader doing research in the library may read at the speed of 1000 words per minute when he looks for materials for a report.But once he finds something that is useful to him, he will slow down the speed to 100 WPM.A good reader may read newspapers and magazine articles at 600 WPM, but at 150 WPM when he reads science or maths texts. 26.According to the passage, good readers can ______.A.go to libraries B.read at 100 WPMC.spend more time reading D.change his reading speed as needed 27.Reading speed depends on (依赖于)______ according to the passage.A.the time when you are reading B.the place where you are reading C.the material and purpose of reading D.the number of books28.A good reader may read at the highest speed when ______ according to the passage. A.he is trying to find the material for his report B.he is trying to work out a maths problem C.he reads the material most useful to him D.he reads newspapers and magazines 29.The passage suggests (暗示) that a good driver should ______.A.drive at a high speed B.drive in all kinds of situations fast C.be good at changing driving speed D.be good at driving on a country road 30.The passage is mainly about ______.A.different reading speeds B.the relationship (关系) between reading and drivingC.the difference between driving and reading D.the best way of fast readingMany students felt it difficult to remember new words when they begin to study English. Now I will give you some advice.(1)Do not waste time in learning a list of English words. It is the hardest way to remember English words. How do you learn to speak Chinese? You did it by listening carefully to the people talking to each other. You can find radio programs, TV programs and records, and listen to them carefully. The best way to learn all new words is through ear. As you listen to more and more dialogues, you will learn how English is pronounced in phrases and sentences. Of course, it is not enough to learn new words, you must learn how words are put together, and why some words in English are emphasized(重读).(2)Some people have found that they can learn the names of everyday objects such as box, bottle, cup, desk and so on, in the following way. They write the names subjects, they say the words. Try this and see if this way works for you. If it does not, then go on to practice your dialogues.31.Who gave the advice? Perhaps it was given by____________A.Karl Marx, B.a teacher from EnglandC.American parents, D.a teacher of English32.The advice the writer gave us is mainly about____________A.how to learn EnglishB.how to put words togetherC.how to learn new wordsD.how to write the names of the objects on paper and put the paper on them.33.The writer gave us two pieces of advice. He seems to enjoy_____________A.the first one, B.the second oneC.both of them, D.neither of them34.The writer thinks that the best way to learn new words is____________A.to do more readingB.to do more writingC.to do more listeningD.to learn which word is emphasized35.The way to write the names of the objects on paper and put the paper on them________ A.works for everyone, B.does not work for anyoneC.works only for some people, D.works only for the Chinese students四、补全对话7选5根据对话内容,从所给的选项中选出能填入空白处的最佳选项。
山东省滕州市张汪镇中心中学2020-2021学年度第一学期12月份月考九年级数学模拟试题
12月份九年级数学月考模拟试题一、选择题1、在反比例函数y=的图象的任一支上,y 都随x 的增大而增大,则k 的值可以是( ) A .﹣1 B .0C .1D .2 2.在Rt ABC ∆中,90C ∠=︒,43B ∠=︒,若BC m =,则AB 的长为( ).A .cos 43mB .cos 43m •C .sin 43m •D .tan 43m •3.如图,正比例函数y 1=k 1x 的图象与反比例函数y 2=k 2x的图象相交于A ,B 两点,其中点A 的横坐标为2,当y 1>y 2时,x 的取值范围是( )A .x <-2或x >2B .x <-2或0<x <2C .-2<x <0或0<x <2D .-2<x <0或x >2 4、盒子中有白色乒乓球8个和黄色乒乓球若干个,为求得盒中黄色乒乓球的个数,某同学进行了如下实验:每次摸出一个乒乓球记下它的颜色,如此重复360次,摸出白色乒乓球90次,则黄色乒乓球的个数估计为( )A. 90个B. 24个C. 70个D. 32个5、在同一直角坐标系中,函数y =-a x 与y =ax +1(a ≠0)的图象可能是( )6、在函数的图象上有三个点,,,则函数值,,的大小为( )A. B. C. D.7.如图,大楼AB 的右侧有一障碍物,在障碍物的旁边有一幢小楼DE ,在小楼的顶端D 处测得障碍物边缘点C 的俯角为30°,测得大楼顶端A 的仰角为45°(点B ,C ,E 在同一水平直线上).已知AB =80m ,DE =10m ,则障碍物B ,C 两点间的距离是( )A .50mB .(70-103)mC .(70+103)mD .10370-⎛⎫ ⎪ ⎪⎝⎭m 8、在矩形ABCD 中,DE ⊥AC 于点E ,设∠ADE =α,且cos α=35,AB =2,则AC 的长为( C )A.32B.85C.103D.839、三名同学同一天生日,她们做了一个游戏:买来张相同的贺卡,各自在其中一张内写上祝福的话,然后放在一起,每人随机拿一张,则她们拿到的贺卡是自己所写的概率是( )A. B. C. D.10、如图,在△ABC 中,∠BAC =90°,AB =AC ,点D 为边AC 的中点,DE ⊥BC 于点E ,连结BD ,则tan ∠DBC 的值为( ) A.13 B.2-1 C .2- 3 D.1411、把一块含45°角的直角三角板ODE 放在如图所示的直角坐标系中,已知动点P 在斜边OD 上运动,点A 的坐标为(0,2),当线段AP 最短时,点P 的坐标为( )A.(0,0)B.⎝⎛⎭⎫22,22C.⎝⎛⎭⎫12,12D.⎝⎛⎭⎫12,22 12.如图,在Rt △ABC 中,∠BAC =60°,点A 的坐标为(﹣1,0),点B 的坐标为(2,4),将△ABC 绕点A 顺时针旋转α(0°<α<90°),得到△AB 1C 1,若AC 1⊥x 轴,则点B 1的坐标为( )A .5325,22⎛⎫-- ⎪⎝⎭B .5532,22⎛⎫-- ⎪ ⎪⎝⎭C .553,22⎛⎫ ⎪ ⎪⎝⎭D .535,22⎛⎫- ⎪⎝⎭ 二、填空题13、从长度分别为2,4,6,7的四条线段中随机取三条,能构成三角形的概率是________.14、已知α,β均为锐角,且满足⎪⎪⎪⎪sin α-12+(tan β-1)2=0,则α+β=________ 15、一个不透明的口袋里装有若干除颜色外其他完全相同的小球,其中有6个黄球,将口袋中的球摇匀,从中任意摸出一个球记下颜色后再放回,通过大量重复上述实验后发现,摸到黄球的频率稳定在30%,由此估计口袋中共有小球________个.16.如图,在△ABC 中,∠B=30°,点P 是AB 上一点,AP=2BP ,PQ ⊥BC 于Q ,连接AQ ,则cos ∠AQC 的值为_________.17. 如图,直线=交轴于点,交轴于点,以为边的正方形的顶点在双曲线上,点在双曲线上,则的值为________.形 18. 如图,在平面直角坐标系中,矩在轴上,的顶点为坐标原点,在轴上,点的坐标为,反比例函数与、交于、两点,将沿着翻折,点恰好落在上的处,则反比例函数的解析式为________.三、解答题19、计算:2cos30°-tan45°-o 2o 1-2tan60+tan 6020.如图,一次函数y=kx+b 的图象与反比例函数y=的图象相交于点A (﹣1,2)、点B (﹣4,n )(1)求此一次函数和反比例函数的解析式;(2)求△AOB 的面积.21.如图,直线y =12x +2与双曲线y =k x相交于点A (m ,3),与x 轴交于点C . (1)求双曲线的解析式;(2)点P 在x 轴上,如果△ACP 的面积为3,求点P 的坐标.22、如图,电路图上有四个开关、、、和一个小灯泡,任意闭合、、、中的两个开关,如果能将灯泡与电源形成一个闭合电路,则小灯泡发光,请用列表或画树状图的方式求“任意闭合两个开关使小灯泡发光“的概率.23、如图①为放置在水平桌面l 上的台灯,底座的高AB 为5 cm ,长度均为20 cm 的连杆BC ,CD 与AB 始终在同一平面上.(1)转动连杆BC ,CD ,使∠BCD 成平角,∠ABC =150°,如图②,求连杆端点D 离桌面l 的高度DE ;(2)将(1)中的连杆CD 再绕点C 逆时针旋转,使∠BCD =165°,如图③,问此时连杆端点D 离桌面l 的高度是增加还是减少?增加或减少了多少?(精确到0.1 cm ,参考数据:2≈1.41,3≈1.73)24、小红将笔记本电脑水平放置在桌子上,显示屏OB 与底板OA 所在的水平线的夹角为120°时,感觉最舒适(如图1),侧面示意图为图2;使用时为了散热,她在底板下垫入散热架'ACO 后,电脑转到''AO B 位置(如图3),侧面示意图为图4.已知OA =OB =24cm ,' O C OA ⊥于点C ,' O C =12cm.(1)求'CAO ∠的度数;(2)显示屏的顶部'B 比原来升高了多少?(3)如图4,垫入散热架后,要使显示屏''O B 与水平线的夹角仍保持120°,则显示屏''O B 应绕点'O 按顺时针方向旋转多少度?25.如图,直线y=kx+2与x轴、y轴分别交于点A、B,点C(1,a)是直线与双曲线y=的一个交点,过点C作CD⊥y轴,垂足为D,且△BCD的面积为1.(1)求双曲线的解析式;(2)若在y轴上有一点E,使得以E、A、B为顶点的三角形与△BCD相似,求点E的坐标.26、如图,在平面直角坐标系中,、是矩形的两个顶点.定义:如果双曲线经过的中点,那么双曲线为矩形的中点双曲线.(1)若,,请判断是否为矩形的中点曲线?并说明理由.(2)若是矩形的中点双曲线,点是矩形与中点双曲线的另一个交点,连结、,四边形的面积,试求出的值.。
2021年山东滕州九上语文期末试卷答案
2020~2021学年度第一学期期末考试九年级语文参考答案一、(共27分)1.(1)jié; jué;黠;涉。
(共4分)(2)读书的态度与方法。
(共2分)(3)示例:天生才干犹如未琢之璞,读书然后成稀世之珍。
(与例句句式相似、修辞手法相同即可,2分)2.B(2分)3.A(2分)4.B(2分)5.(1)豪兴徜徉;(2)我是你雪被下古莲的胚芽;(3)斫去桂婆娑;(4)二者不可得兼,舍生而取义者也;八年风味徒思浙。
(共6分)6.(1)示例一:在渭州,鲁智深三拳打死镇关西。
示例二:鲁智深大闹五台山。
示例三:鲁智深单打二龙山。
示例四:鲁智深坐化六和寺。
(2 分)(2)示例一:“鲁智深和李逵”。
相同点:嫉恶如仇,侠肝义胆,脾气火爆(1分)。
不同点:鲁智深粗中有细,豁达明理(1分);李逵头脑简单,直爽率真(1 分)。
(共3分)示例二:“林冲和武松”。
相同点:刚烈正直,有勇有谋(1分)。
不同点:林冲安分守己,循规蹈矩(1分);武松崇尚的是义,有仇必复,有恩必报,是英雄好汉中最富有血性的(1分)。
(共3分)(3)我们应该用一分为二的观点来看待这类行为。
既看到这类英雄疾恶如仇.侠肝义胆的“义”的一面,值得弘扬(1分);同时也要看到他们冲动、鲁莽造成不良后果的一面,是不足取的(1分)。
(言之有理即可,共2分)二、(共43分)(一)(4分)7.示例:太守率领众多随从纵马飞奔,像狂风一样越过小山冈。
(2 分)8.D(2分)(二)(14分)9.(1)只,仅仅;(2)出使; (3)告诉; (4)固执。
(共4分)10.A(2分)11.(1)而安陵国却凭借方圆五十里的土地幸存下来,是因为我把安陵君看作忠厚长者,所以不打他的主意。
(2)不久 ,最终让昌蒙正推荐的人出使辽国,果然出色地完成了使命。
(共4分)12.(1)乎,表责问语气(1分);唐雎大义凛然,不惧强暴 ,据理力争,质问秦王(1分)。
(2)尔,表示非常肯定的语气(1分),吕蒙正面对君王据理力争,果敢坚定(1分)。
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2020-2021学年度第一学期山东省滕州市张汪中学期末复习综合练习题九年级英语一、完型填空When I was a boy, every holiday that I had seemed wonderful. My parents took me by train or by car to a hotel by the _______. All day, I seem to remember, I was playing on the sands with strange _______ children. We made houses and gardens, and _______ the tide (潮汐) wash them away. When the tide went out, we climbed over the rocks and looked _______ at the fish in the rock-pools.In those days, it seemed to shine always shone _______ and the water was always warm. Sometimes we left beach and walked in the country, exploring (搜寻) broken houses and dark woods, or climbing trees. There were sweets in one's pockets or good places where one could _______ ice creams. Each day seemed a life-time.Although I am now thirty-five years old, my idea of a good holiday is the same as it was many years ago. I_______ like the sun, warm sand and the sound of waves beating the rocks. It's true that I no longer wish to build any sand house or sand garden, and I dislike sweets any longer. _______, I love the sea just like before and often feel sand running through my fingers.Sometimes I _______ what my dream holiday will be like when I am old. All I want to do then, perhaps, will be to lie in bed, reading books about children who make houses and gardens with sands, who watch the coming tide,who make ________ sick because of too much ice cream.1.A.sea B.market C.palace D.mountain2.A.bored B.excited C.embarrassed D.nervous3.A.carried B.brought C.watched D.got4.A.down B.up C.over D.off5.A.brightly B.wisely C.exactly D.lastly6.A.double B.sell C.buy D.clean7.A.hardly B.almost C.still D.perhaps8.A.But B.However C.Or D.So9.A.wonder B.feel C.understand D.believe10.A.their B.they C.theirs D.themselves二、阅读单选Technology is forever changing the way we get our news. Many people now get a lot of their news on electronic devices, instead of traditional media, such as newspapers, television or radio. An increasing number of people also report turning to social media for information.Now, there is a new technology that could greatly change the way we get the news: computer-created news readers. The news readers-created by machine learning technology, are based on two real-life Chinese newsmen. One is able to present(播出) newscasts in English, the other, in Chinese.In Xinhua's report, it said machine learning was used to examine video looks and sounds of the two newsmen. The system then created the AI robotic presenters, which look and sound like real people. The AI presenters will be a great improvement to the news team because they "can work 24 hours a day tirelessly" on its website and on social media. And they were able to read the news "as naturally as" a human presenter.On social media, many Chinese noted that the AI presenters did not seem real. People criticized them for not being more lifelike. On China's Twitter-like service micro-blog, several users wrote that the news readers have "no soul(灵魂)." One user joked, "What if we had an AI leader(of China)?"Some wondered if AI robots might take the workers' place. "It all depends on production costs, which will determine if we lose jobs?" one micro-blog user wrote. Some people argued that only low-level jobs requiring heavy labor will be replaced by AI robots. Others praised the technology as a way for companies to make money from low-cost labor machines.Recently Britain's BBC used machine learning to make an AI presenter. It looked like one of its news readers who were speaking different languages. Also, developers working on Amazon's Alexa(a smart speaker system) have worked to create a special news reader voice for the electronic assistant(助理). Such a system could be further developed to provide other kinds of speaking voices for different situations in the near future.11.Paragraph 1 mainly tells us ______ has greatly changed our way of getting news.A.newspapers B.technology C.television D.radio12.The following EXCEPT ______ are the AI presenters' advantage.A.To examine the looks and sound. B.To read news as naturally as human.C.To work 24 hours a day tirelessly. D.To be like real people's look and sound.13.What does the underlined word "criticized" most probably mean in Chinese?A.支持B.赞扬C.指责D.驳回14.According to the passage, which is NOT true about the AI presenters?A.The AI presenters have no soul and lifelikeness. B.Micro-blog users all praised the AI presenters.C.The AI presenters can speak different languages. D.The AI presenters are based on real-life news readers.15.The passage most probably taken from ________.A.a news report B.a news poster C.a history book D.a music magazineDo you have a smart speaker to play your favorite song? Have you ever had a chat with Siri? I'm sure your answer must be yes. Voice assistants are programs on digital devices. They listen and respond to verbal (口头的) orders.Today's voice assistants can help you with many things. They can do almost anything you can think of. They can answer questions, make calls as well as provide weather, traffic, sports and other realtime information. They can even control smart devices (装置) in your home, such as the highlights and air conditioner.So how do they understand us?It all starts with a signal word. Users say the names of their voice assistants to get their attention. For example, they might say, "Hey, Siri!" The signal word wakes up the device and tells it to begin paying attention.After it hears the signal word, the voice assistant starts recording. The device waits for a pause to know you've finished your request. It then sends your recorded request over the Internet to its database (数据库).Once in the database, your request is compared to other requests. It's divided into separate orders that your voice assistant can understand. The database then sends these separate orders back to the device. When it receives the orders, the voice assistant will carry out the task you asked for.Voice assistants are improving all the time. If you say to a smart speaker, "Play rock music", and it plays country music, you'll tell it to stop. This teaches the device that the orders it received from its database were wrong. It will tell the database about the mistake and try to do better next time.Sometimes a voice assistant might ask a question after it receives your request to make sure it understands what you want.16.What is Siri?A.A computer. B.A radio. C.A phone. D.A program.17.How do the voice assistants begin to work?A.Users say their names. B.They hear the users' voices.C.Users have a chat with them. D.They answer the questions.18.Which of the following is TRUE according to the passage?A.The smart speaker can receive written words.B.Any orders can be understood by the voice assistants.C.We can use voice assistants to control the smart refrigerator.D.As soon as the voice assistant hears the signal word, it sends requests.19.What's the main idea of the last paragraph?A.Users can teach voice assistants to understand.B.Voice assistants make mistakes but can be improved.C.A smart speaker can do almost anything you can request.D.Users should stop the voice assistant when it carries out the wrong task.20.What's the best title of the passage?A.What Are Voice Assistants B.How Do Voice Assistants WorkC.What Can Voice Assistants Do D.How Do Voice Assistants UnderstandHave you ever heard of e-waste, which can be produced every day? How do you deal with your computers, Mp4 players and mobile phone when they’re broken or you want a new one?Most people just throw them away. With the development of the electric industry, e-waste pollution has become a serious problem. According to the United Nations, in 2014, people around the world produced 41. 8 million tons of e-waste and only recycled 6. 5 million tons. The US was the biggest waster, producing 7. 1 million tons. China came second, with 6 million tons.It’s important to pay attention to e-waste. It can either be valuable or harmful(有害的), depending on how we deal with it. E-waste is a valuable urban mine (城市矿藏) .The value of the metals, like gold and silver in the waste around the world, is amazing. And the metals can be reused. But if people throw them away, the toxic chemicals (有毒化学物质) can get into the earth or air, affecting the environment and people’s health.Apple Inc, for example, now recycles people’s used products in China when they are buying new ones. The company will test and repair the used ones and sell them at lower prices. To help reduce (减少) e-waste, we can also take computers and phones to see if companies offer recycling programs.21.The following can become e-waste EXCEPT ________ .A.computers B.mobile phones C.plastic bags D.MP4 players22.Which country produced most e-waste in 2014 according to the United Nations?A.America. B.China. C.Japan. D.The UK.23.What does the underline word “affecting”mean in this passage?A.保护B.影响C.改善D.改变24.From Paragraph 4, we learn that ________ .A.the recycled Apple products will be sold at higher pricesB.we should improve the sense of reducing e-wasteC.It’s better to keep the unwanted electronics in your bedroomD.used electric products can’t be recycled25.The main purpose of this passage is to ________ .A.prove that e-waste is uselessB.talk about the value of e-wasteC.encourage people to buy more electronic productsD.advise people to deal with e-waste properly to reduce pollution三、补全短文7选5My son Kelvin was swimming in the pool. He reminded me of my first swimming lesson. I saw my classmatesKelvin’s words brought me back from memory. “27. Try to swim to me, OK?”he said in a teaching way. Ilooked at my son. Although there was only ten meters between us, I was afraid I couldn’t reach him.I stood back and wanted to leave. At that time, I remembered my son’s first swimming lesson. He was afraid of the water, too. 28. My son could face the problem. Why couldn’t I? Then I closed my eyes and made my way in the water. 29.“Good job!”I heard Kelvin saying when I stopped. I turned around and looked at the pool. I couldn’t believe I swam so far at last. I found swimming wasn’t as difficult as I thought. 30. Thanks to Kelvin, I became more opento new things.A.Look at how I swim, Mom.B.I was also interested in swimming.C.My son gave me an important lesson.D.I was so afraid of it.E.I swam past him and kept going.F.My son learned swimming from his father.G.However, he didn’t run away from the pool.四、语法填空Once, there were two men who wanted to marry the same beautiful lady. One of these men was五、完成句子41.不管我们感受如何,我们都应该努力为自己的所作所为负责任。