2018年杭州市七年级下期末模拟测试卷含答案
∥3套精选试卷∥2018年浙江省名校七年级下学期数学期末学业质量检查模拟试题

七年级下学期期末数学试卷一、选择题(每题只有一个答案正确)1.下列长度的三条线段,能组成三角形的是( )A.4,5,9 B.8,8,15 C.5,5,10 D.6,7,14【答案】B【解析】结合“三角形中较短的两边之和大于第三边”,分别套入四个选项中得三边长,即可得出结论.【详解】A、∵5+4=9,9=9,∴该三边不能组成三角形,故此选项错误;B、8+8=16,16>15,∴该三边能组成三角形,故此选项正确;C、5+5=10,10=10,∴该三边不能组成三角形,故此选项错误;D、6+7=13,13<14,∴该三边不能组成三角形,故此选项错误;故选:B.【点睛】此题考查三角形三边的关系,难度不大2.如图,将三角形纸板ABC沿直线AB向右平行移动,使∠A到达∠B的位置,若∠CAB=45°,∠ABC=100°,则∠CBE的度数为( )A.25°B.30°C.35°D.40°【答案】C【解析】∵将△ABC沿直线AB向右平移后到达△BDE的位置,∴AC∥BE,∴∠EBD=∠CAB=45°,∵∠ABC=100°,∴∠CBE的度数为:180°-45°-100°=35°.故选C.3.在数轴上表示不等式x<2的解集,正确的是()A.B.C.D.【答案】A【解析】把不等式x<2的解集在数轴上表示出来可知答案.【详解】在数轴上表示不等式x<2的解集故选:A.【点睛】本题运用了不等式的解集在数轴上的表示方法,体现了数形结合的数学思想.4.不等式的解集在数轴上表示正确的是()A.B.C.D.【答案】D【解析】求出不等式的解集,再根据“大于向右,小于向左,不包括端点用空心,包括端点用实心”的原则将解集在数轴上表示出来.【详解】解:解不等式,得:x≥2,表示在数轴上如图:故选:D.【点睛】本题主要考查解不等式得基本能力及在数轴上表示不等式的解集,不等式的解集在数轴上表示的方法:把每个不等式的解集在数轴上表示出来(>,≥向右画;<,≤向左画),在表示解集时“≥”,“≤”要用实心圆点表示;“<”,“>”要用空心圆点表示.5.某校为了了解七年级学生的体能情况,随机抽查了其中的30名学生,测试了1分钟仰卧起座的次数,并绘制成如图所示的频数分布直方图,请根据图示计算,仰卧起座次数在15-20次之间的频率是().A .0.4B .0.33C .0.17D .0.1【答案】D 【解析】根据图像观察出仰卧起座次数在15-20次之间的人数即可求解.【详解】由图可知,仰卧起座次数在15-20次之间的人数为30-12-10-5=3 ∴频率为3=0.130 故选D.【点睛】本题考查的是频率,熟练掌握图像是解题的关键.6.对于实数x ,我们规定[x]表示不大于x 的最大整数,例如[1.2]=1,[3]=3,[-2.5]=-3,若[1-12x -]=5,则x 的取值范围是( )A .-7<x ≤-5B .-7≤x <-5C .-9≤x <-7D .-9<x ≤-7 【答案】D【解析】根据新定义得出不等式组,求出不等式组的解集即可.【详解】∵[1-12x -]=5, ∴5≤1-12x -<6, 解得:-9<x≤-7,故选D .【点睛】本题考查了解一元一次不等式组,根据新定义得出关于x 的不等式组是解此题的关键.7.为了了解2019年北京市乘坐地铁的每个人的月均花费情况,相关部门随机调查了1000人乘坐地铁的月均花费(单位:元),绘制了如下频数分布直方图,根据图中信息,下面三个推断中,合理的是( )①小明乘坐地铁的月均花费是75元,那么在所调查的1000人中一定有超过一半的人月均花费超过小明;②估计平均每人乘坐地铁的月均花费的不低于60元;③如果规定消费达到一定数额可以享受折扣优惠,并且享受折扣优惠的人数控制在20%左右,那么乘坐地铁的月均花费达到120元的人可享受折扣.A.①②B.①③C.②③D.①②③【答案】D【解析】①求出80元以上的人数,能确定可以判断此结论;②根据图中信息,可得大多数人乘坐地铁的月均花费在60−120之间,据此可得平均每人乘坐地铁的月均花费的范围;③该市1000人中,30%左右的人有300人,根据图形可得乘坐地铁的月均花费达到100元的人有300人可以享受折扣.【详解】解:①超过月均花费80元的人数为:200+100+80+50+25+25+15+5=500,小明乘坐地铁的月均花费是75元,所调查的1000人中至少有一半以上的人月均花费超过小明;故①正确;②根据图中信息,可得大多数人乘坐地铁的月均花费在60~120之间,估计平均每人乘坐地铁的月均花费的范围是60~120,所以估计平均每人乘坐地铁的月均花费的不低于60元,此结论正确;③∵1000×20%=200,而80+50+25+25+15+5=200,∴乘坐地铁的月均花费达到120元的人可以享受折扣.此结论正确;综上,正确的结论为①②③,故选:D.【点睛】本题主要考查了频数分布直方图及用样本估计总体,一般来说,用样本去估计总体时,样本越具有代表性、容量越大,这时对总体的估计也就越精确.抽样调查具有花费少、省时的特点,但抽取的样本是否具有代表性,直接关系到对总体估计的准确程度.8.下列命题中,属于真命题的是()A.互补的角是邻补角B.在同一平面内,如果a⊥b,b⊥c,则a⊥c.C.同位角相等D.在同一平面内,如果a∥b,b∥c,则a∥c.【答案】D【解析】A. ∵互补的角是补角,不一定是邻补角,故不正确;B. ∵在同一平面内,如果a⊥b,b⊥c,则a∥c,故不正确;C. ∵两直线平行,同位角相等,故不正确;D. 在同一平面内,如果a∥b,b∥c,则a∥c故正确;故选D.9.下列调查方式中,适合采用全面调查的是()A.调查市场上一批节能灯的使用寿命B.了解你所在班级同学的身高C.环保部门调查某段水域的水质情况D.了解某个水塘中鱼的数量【答案】B【解析】由全面调查得到的调查结果比较准确,但所费人力、物力和时间较多,而抽样调查得到的调查结果比较近似.【详解】解:A、要了解一批节能灯的使用寿命,由于具有破坏性,应当使用抽样调查,故A不合题意;B、调查你所在班级的同学的身高,人数少,范围小,应当采用全面调查的方式,故B正确;C、环保部门调查某段水域的水质情况,范围广,工作量大,不宜采用普查,而且只需要大概知道水质情况就可以了,应当采用抽样调查,,故C不合题意;D、了解某个水塘中鱼的数量,不便于检测而且不需要准确数量,采用抽样调查,故D不合题意;故选B.【点睛】本题考查了抽样调查和全面调查的区别,选择普查还是抽样调查要根据所要考查的对象的特征灵活选用,一般来说,对于具有破坏性的调查、无法进行普查、普查的意义或价值不大,应选择抽样调查,对于精确度要求高的调查,事关重大的调查往往选用普查.10.下列命题:①对顶角相等;②内错角相等;③两条平行线之间的距离处处相等;④有且只有一条直线垂直于已知直线.其中是假命题的有()A.①②B.②④C.②③D.③④【答案】B【解析】利用对顶角的性质、平行线的性质等知识分别判断后即可确定正确的选项.【详解】①对顶角相等,正确,是真命题;②两直线平行,内错角相等,故错误,是假命题;③两条平行线之间的距离处处相等,正确,是真命题;④过一点有且只有一条直线垂直于已知直线,故错误,是假命题,故选:B .【点睛】本题考查了命题与定理的知识,解题的关键是了解对顶角的性质、平行线的性质等知识,难度不大.二、填空题题11.计算:1216+=_________.【答案】6【解析】根据分类指数幂的意义以及二次根式的性质逐一进行化简,然后再进行计算即可.【详解】1216+=4+2=6,故答案为:6.【点睛】本题考查了实数的运算,涉及了分数指数幂、二次根式的化简,熟练掌握相关的运算法则是解题的关键. 12.已知点(),P x y 在y 轴右侧,且点P 到x 轴的距离为3,到y 轴的距离为2,则点P 的坐标为__________.【答案】()2,3或()2,3-【解析】根据点到坐标轴的距离公式(点(),P x y 到x 轴的距离为y ,到y 轴的距离为x )计算出,x y 的值,再由题意取合适的坐标即可.【详解】解: 点P 到x 轴的距离为3,到y 轴的距离为2 3,2y x ∴==解得3,2y x =±=± 点(),P x y 在y 轴右侧0x ∴>2x ∴=所以点P 的坐标为()2,3或()2,3-故答案为:()2,3或()2,3-【点睛】本题主要考查了点到坐标轴的距离,熟练掌握点到坐标轴的距离公式是解题的关键.13.不等式()231a x -<的解集是123x a >-,则a 的取值范围是_______________________. 【答案】32a < 【解析】据已知不等式的解集,结合x 的系数确定出2a-3为负数,求出a 的范围即可. 【详解】解:∵不等式(2a-3)x <1的解集是123x a >-, ∴2a-3<0,∴32a <, 即a 的取值范围是32a <, 故答案为:32a <. 【点睛】 本题考查了解一元一次不等式和不等式的性质,能根据不等式的性质得出关于a 的不等式是解此题的关键.14.因式分解221215x y xy -=______【答案】()345xy x y -【解析】直接利用提取公因式法进行因式分解即可.【详解】解:221215x y xy -=()345xy x y -.故答案为:()345xy x y -.【点睛】本题主要考查因式分解,解此题的关键在于准确找到公因式.15.如图(甲)是四边形纸片 ABCD ,其中∠B =130°,∠D =50°.若将其右下角向内折出△PCR ,恰使CP ∥AB ,RC ∥AD ,如图(乙)所示,则∠C =_____.【答案】90°【解析】根据两直线平行,同旁内角互补求出∠BPC 和∠DRC ,再根据翻折的性质求出∠CPR 和∠CRP ,然后利用三角形的内角和定理列式计算即可得解.【详解】∵CP ∥AB ,RC ∥AD ,∴∠BPC=180°-∠B=180°-130°=50°,∠DRC=180°-∠C=180°-50°=130°,由翻折的性质,∠CPR=12(180°-∠BPC )=12(180°-50°)=65°, ∠CRP=12(180°-∠DRC )=12(180°-130°)=25°, 在△CPR 中,∠C=180°-∠CPR-∠CRP=180°-65°-25°=90°. 故答案为90°.【点睛】本题考查了平行线的性质,翻折变换的性质,以及三角形的内角和定理,熟记性质并准确识图是解题的关键.16.如图,在△ABC 中,已知点D 、E 、F 分别为BC 、AD 、CE 的中点,且S △ABC =4cm 2,则S △BEF =_________【答案】1【解析】由三角形的中线把三角形分成两个面积相等的三角形解答.【详解】∵点E 是AD 的中点,∴S △ABE =12S △ABD ,S △ACE =12S △ADC , ∴S △ABE +S △ACE =12S △ABC =12×4=1cm 1, ∴S △BCE =12S △ABC =12×4=1cm 1, ∵点F 是CE 的中点,∴S △BEF =12S △BCE =12×1=1cm 1. 故答案是:1cm 1.【点睛】考查了三角形的面积,主要利用了三角形的中线把三角形分成两个面积相等的三角形,原理为等底等高的三角形的面积相等.17.点(2,9)P -与点Q 关于x 轴对称,则点Q 的坐标是__________.【答案】(2,9)--【解析】已知点()2,9P -,根据两点关于x 轴的对称,横坐标不变,纵坐标互为相反数,即可得出Q 的坐标.【详解】∵点(2,9P -)与点Q 关于x 轴对称,∴点Q 的坐标是:()2,9--.故答案为()2,9--【点睛】考查关于x 轴对称的点的坐标特征,横坐标不变,纵坐标互为相反数.三、解答题18.(1)计算:26-(2)解方程组231x y x y -=⎧⎨-=⎩;(3)解不等式组:2(1)1112x x x x --⎧⎪⎨+>-⎪⎩ 【答案】(1)8;(2)21x y =⎧⎨=⎩;(3)1x 【解析】(1)根据实数的混合运算顺序和运算法则计算可得;(2)利用加减消元法求解可得;(3)分别求出每一个不等式的解集,根据口诀:同大取大、同小取小、大小小大中间找、大大小小无解了确定不等式组的解集.【详解】解:(1)原式11226122282=--⨯=--=; (2)2x y 3x y 1-=⎧⎨-=⎩①②, ①-②,得:x 2=,将x 2=代入②,得:2y 1-=,解得y 1=,则方程组的解为21x y =⎧⎨=⎩; (3)解不等式()x 2x 11--,得:x 1, 解不等式1x x 12+>-,得:x 3<, 则不等式组的解集为x 1.【点睛】本题考查的是解一元一次不等式组,正确求出每一个不等式解集是基础,熟知“同大取大;同小取小;大小小大中间找;大大小小找不到”的原则是解答此题的关键.19.如图,ABC ∆的顶点都在方格纸的格点上.(1)画出ABC ∆关于直线MN 的对称图形111A B C ∆;(2)画出ABC ∆绕点B 逆时针旋转90后并下移2个单位得到的图形222A B C ∆.【答案】答案见解析.【解析】(1)根据轴对称的性质分别画出A ,B ,C 点关于MN 的对称点A 1,B 1,C 1,再将三点依次连接起来即可;(2)利用网格特点和旋转的性质先把ABC 绕点B 逆时针旋转90°,然后利用平移的性质画出222A B C △.【详解】解:(1)111A B C △即为所求;(2)222A B C △即为所求.【点睛】本题考查了作图——轴对称变换和旋转变换. 根据旋转的性质可知,对应角都相等,对应边都相等,由此可以通过作相等的角,在角的边上截取相等的线段的方法,找到对应点,顺次连接得到旋转后的图. 20.在△ABC 中,∠ACB=90° AD 是它的角平分线,EB ⊥AB 于点 B 且交 AD 的延长线于点 E. (1)如图 1,求证:BD=BE(2)如图 2,过点 E 作 EF ⊥BC 于点 F, CF:BF=5:3, BE=10,求 DF 的长.图1图 2【答案】(1)证明见解析.(2)DF=4【解析】分析:(1)过点B作BG⊥DE于G, 根据AD是△ABC的角平分线, EB⊥AB得∠ADC=∠E,再证∠BGD=∠BGE,最后根据BG=BG可证△BDG≌△BEG,从而可得BD=BE.(2)过点D作DH⊥AB于H,先证△BHD≌△EBF,得到DH=BF,从而CD=BF.设CF=5x,BF=3x,根据BD=BF+DF 可求出x的值,可求出DF的值.详解:(1)证明:过点B作BG⊥DE于G∵AD是△ABC的角平分线∴∠BAD=∠CAD∵EB⊥AB∴∠ABE=90°在Rt△ABE中∠BAE+∠E=90°在Rt△ACD中∠CAD+∠ADC=90°∴∠ADC=∠E∵∠ADC=∠BDE∴∠BDE=∠E∴∠BGD=∠BGE∵BG=BG∴△BDG≌△BEG(AAS)∴BD=BE(2)过点D作DH⊥AB于H,∵∠ACB=90°∴ CD⊥AC∴ CD=DH∵∠ABE=90°∴∠ABC+∠FBE=90∵ EF⊥BD∴∠BFE=90°∴∠FEB+∠FBE=90°∴∠HBD=∠FEB∵ DH⊥AB∴∠BHD=90°∴△BHD≌△EBF(AAS)∴ DH=BF∴ CD=BF∵ CF:BF=5:3∵设CF=5x,BF=3x,则CD=3x, DF=CF-CD=5x-3x=2xBD=BF+DF=3x+2x==5x∵ BE=10∴ DF=2×2=4点睛: 本题考查了角平分线的性质的运用,三角形全等的判定及性质的运用,解答时证明三角形全等是关键.21.已知2a ﹣3x +1=0,3b ﹣2x ﹣16=0.(1)用含x 的代数式分别表示a ,b ;(2)当a ≤4<b 时,求x 的取值范围.【答案】(1)312x a -=,2163x b +=;(2)﹣2<x ≤1. 【解析】(1)直接利用已知将原式变形求出答案;(2)利用a ≤4<b 得出关于x 的不等式求出答案.【详解】解:(1)由2a ﹣1x +1=0,得312x a -=, 由1b ﹣2x ﹣16=0,得2163x b +=; (2)∵a ≤4<b , ∴312x a -=≤4,2163x b +=>4, 解得:﹣2<x ≤1.【点睛】此题主要考查了不等式的性质,直接将原式变形是解题关键.22.先化简,再求值:2310x x --=,求代数式 22(3)()()x x y x y y -++-+ 的值.【答案】11.【解析】先将代数式()()()223x x y x y y -++-+化简,再由2310x x --=得到231x x -=代入化简所得的式子计算即可.【详解】解:()()()223x x y x y y -+-++ 222269x x x y y =-++-+2269x x =-+∵ 2310x x --=,∴ 231x x -=,∴原式()2239x x =-+ 29=+=11.【点睛】本题的解题要点有以下两点:(1)熟记“完全平方公式:222()2a b a ab b ±=±+和平方差公式:22()()a b a b a b +-=-”;(2)由2310x x --=得到231x x -=,再采用整体代入化简所得式子的方式进行计算.23.为了了解某校七年级男生的体能情况,体育老师随即抽取部分男生进行引体向上测试,并对成绩进行了统计,绘制成图1和图2尚不完整的统计图.(1)本次抽测的男生有 人;(2)请你将图1的统计图补充完整;(3)若规定引体向上5次以上(含5次)为体能达标,则该校350名九年级男生中,估计有多少人体能达标?【答案】(1)50;(2)5次的人数有16人(3)252【解析】(1)由引体向上的次数为4次的人数除以所占的百分比即可求出抽测的男生数;(2)求出次数为5次的人数,补全统计图即可;(3)求出5次以上(含5次)人数占的百分比,乘以350即可得到结果.【详解】(1)根据题意得:10÷20%=50(人),则本次抽测的男生有50人;故答案为50人;(2)5次的人数为50-(4+10+14+6)=16(人),补全条形统计图,如图所示:(3)根据题意得:3635025250⨯=人, 则该校350名九年级男生中估计有252人体能达标.【点睛】此题考查了条形统计图,扇形统计图,以及用样本估计总体,弄清题意是解本题的关键.24.已知:在△ABC和△DEF中,∠A=40°,∠E+∠F=100°,将△DEF如图摆放,使得∠D的两条边分别经过点B和点C.(1)当将△DEF如图1摆放时,则∠ABD+∠ACD= 度;(2)当将△DEF如图2摆放时,请求出∠ABD+∠ACD的度数,并说明理由.(3)能否将△DE摆放到某个位置时,使得BD、CD同时平分∠ABC和∠ACB?直接写出结论(填“能”或“不能”)【答案】(1)1;(2)30°;(3)不能.【解析】(1)要求∠ABD+∠ACD的度数,只要求出∠ABC+∠CBD+∠ACB+∠BCD,利用三角形内角和定理得出∠ABC+∠ACB=180°-∠A=180°-40°=140°;根据三角形内角和定理,∠CBD+∠BCD=∠E+∠F=100°,得出∠ABD+∠ACD=∠ABC+∠CBD+∠ACB+∠BCD=140°+100°=1°;(2)要求∠ABD+∠ACD的度数,只要求出∠ABC+∠ACB-(∠BCD+∠CBD)的度数.根据三角形内角和定理,∠CBD+∠BCD=∠E+∠F=100°;根据三角形内角和定理得,∠ABC+∠ACB=180°-∠A=140°,得出∠ABD+∠ACD=∠ABC+∠ACB-(∠BCD+∠CBD)=140°-100°=40°;(3)不能.假设能将△DEF摆放到某个位置时,使得BD、CD同时平分∠ABC和∠ACB.则∠CBD+∠BCD=∠ABD+∠ACD=100°,那么∠ABC+∠ACB=200°,与三角形内角和定理矛盾,所以不能.【详解】(1)在△ABC中,∠A+∠ABC+∠ACB=180°,∠A=40°∴∠ABC+∠ACB=180°-∠A=180°-40°=140°在△BCD中,∠D+∠BCD+∠CBD=180°∴∠BCD+∠CBD=180°-∠D在△DEF中,∠D+∠E+∠F=180°∴∠E+∠F=180°-∠D∴∠CBD+∠BCD=∠E+∠F=100°∴∠ABD+∠ACD=∠ABC+∠CBD+∠ACB+∠BCD=140°+100°=1°,故答案为1.(2)∠ABD+∠ACD=30°;理由如下:∵∠E+∠F=100°∴∠D=180°-(∠E+∠F )=80°∴∠ABD+∠ACD=180°-∠A-∠DBC-∠DCB=180°-50°-(180°-80°)=30°;(3)不能.假设能将△DEF 摆放到某个位置时,使得BD 、CD 同时平分∠ABC 和∠ACB .则∠CBD+∠BCD=∠ABD+∠ACD=100°,那么∠ABC+∠ACB=200°,与三角形内角和定理矛盾,故答案为不能.【点睛】此题考查三角形内角和定理,外角性质.熟练掌握这些性质是解题的关键.25.如图,方格纸中的每个小方格都是边长为1个单位长度的正方形,每个小正方形的顶点叫格点,ABC ∆的顶点均在格点上,O ,M 也在格点上.(1)画出ABC ∆先向右平移5个单位长度,再向下平移5个单位长度得到的'''A B C ∆;(2)画出ABC ∆关于直线OM 对称的111A B C ∆;(3)画出ABC ∆绕点O 按顺时针方向旋转90后所得的222A B C ∆;(4)111A B C ∆与222A B C ∆组成的图形是轴对称图形吗?如果是轴对称图形,请画出对称轴.【答案】(1)见解析;(1)见解析;(3)见解析;(4)是,见解析.【解析】(1)利用网格特点和平移的性质画出A 、B 、C 的对应点A′、B′、C′即可;(1)利用网格特点和轴对称的性质画出A 、B 、C 的对应点A 1、B 1、C 1即可;(3)利用网格特点和旋转的性质画出A 、B 、C 的对应点A 1、B 1、C 1即可;(4)利用轴对称图形的定义可判断△A 1B 1C 1与△A 1B 1C 1组成的图形是轴对称图形,其中对称轴为直线CC′和直线A 1A 1.【详解】解:(1)如图,△A′B′C′为所作;(1)如图,△A 1B 1C 1为所作;(3)如图,△A 1B 1C 1为所作;(4)△A1B1C1与△A1B1C1组成的图形是轴对称图形,如图,对称轴为直线CC′和直线A1A1.【点睛】本题考查了作图-旋转变换:根据旋转的性质可知,对应角都相等都等于旋转角,对应线段也相等,由此可以通过作相等的角,在角的边上截取相等的线段的方法,找到对应点,顺次连接得出旋转后的图形.七年级下学期期末数学试卷一、选择题(每题只有一个答案正确)1.以下列数据为长度的三条线段,能组成三角形的是()A.2 cm、3cm、5cm B.2 cm、3 cm、4 cmC.3 cm、5 cm、9 cm D.8 cm、4 cm、4 cm【答案】B【解析】三角形的任何一边大于其他两边之差,小于两边之和,满足此关系的可组成三角形,其实只要最小两边的和大于最大边就可判断前面的三边关系成立.【详解】A、2+3=5,故本选项错误.B、2+3>4,故本选项正确.C、3+5<9,故本选项错误.D、4+4=8,故本选项错误.故选B.【点睛】本题考查三角形的三边关系,根据三角形的任何一边大于其他两边之差,小于两边之和,满足此关系的可组成三角形.2.如图,AB∥EF,则∠A、∠C、∠D、∠E满足的数量关系是( )A.∠A+∠C+∠D+∠E=360°B.∠A-∠C+∠D+∠E=180°C.∠E-∠C+∠D-∠A=90°D.∠A+∠D=∠C+∠E【答案】B【解析】过点C作CG∥AB,过点D作DH∥EF,根据两直线平行,内错角相等可得∠A=∠ACG,∠CDH=∠DCG,两直线平行,同旁内角互补可得∠EDH=180°-∠E,然后表示出∠C,整理即可得答案.【详解】解:如图,过点C作CG∥AB,过点D作DH∥EF,∴∠A=∠ACG,∠EDH=180°-∠E,∵AB∥EF,∴CG∥DH,∴∠CDH=∠DCG,∴∠C=∠ACG+∠CDH=∠A+∠D-(180°-∠E),∴∠A-∠C+∠D+∠E=180°.故选B.【点睛】本题考查了平行线的性质,难点在于过拐点作平行线.熟练掌握平行线的性质是即可根据.3.点M在x轴的上方,距离x轴3个单位长度,距离y轴2个单位长度,则M点的坐标为()A.(3,2)B.(-2,3)C.(3,2)或(-3,2)D.(2,3)或(-2,3)【答案】D【解析】分析:要根据两个条件解答:①M到y轴的距离为2,即横坐标为±2;②点M距离x轴1个单位长度,x轴上方,即M点纵坐标为1.详解:∵点距离x轴1个单位长度,∴点M的纵坐标是±1,又∵这点在x轴上方,∴点M的纵坐标是1;∵点距离y轴2个单位长度即横坐标是±2,∴M点的坐标为(-2,1)或(2,1).故选:D.点睛:本题主要考查了点的坐标的几何意义,横坐标的绝对值就是到y轴的距离,纵坐标的绝对值就是到x轴的距离.4.不等式组10840xx->⎧⎨-≤⎩的解集在数轴上表示为( )A.B.C.D.【答案】A【解析】分析:先对不等式组进行化简,找出它们的公共部分,然后在数轴上分别表示出x的取值范围.详解:不等式组由①得,x>1,由②得,x⩾2,故不等式组的解集为:x⩾2,在数轴上可表示为:故选A.点睛:本题考查了解一元一次不等式组和在数轴上表示不等式组的解集,注意在数轴上表示解集时,空心圈和实心圈的区别.5.解方程组1235x y x y =+⎧⎨-=⎩时,较为简单的方法是( ) A .代入法B .加减法C .特殊值法D .无法确定【答案】A【解析】方程组利用代入消元法求出解即可. 【详解】解:解方程组1235x y x y =+⎧⎨-=⎩①②时,直接将①代入②得x 的值,进而得到y 的值. 因此较为简单的方法是代入法故选:A .【点睛】此题考查解二元一次方程组,利用了消元的思想,消元的方法有:代入消元法与加减消元法. 616( )A .4B .8C .4±D .8± 【答案】A【解析】依据算术平方根的定义求解即可. 16故选A【点睛】此题考查算术平方根,掌握运算法则是解题关键7.下列运算中正确的是( )A .224a a 2a +=B .()628x (x)x -⋅-=C .2353(2a b)4a 2ab -÷=-D .222(a b)a b -=-【答案】C【解析】各项计算得到结果,即可作出判断.【详解】解:A 、原式=2a 2,不符合题意;B 、原式=-x 6•x 2=-x 8,不符合题意;C、原式=-8a6b3÷4a5=-2ab3,符合题意;D、原式=a2-2ab+b2,不符合题意,故选C.【点睛】此题考查了整式的混合运算,熟练掌握运算法则是解本题的关键.8.如图是一个运算程序的示意图,若开始输入x的值为81,则第2019次输出的结果为()A.3 B.27 C.9 D.1【答案】A【解析】根据运算程序进行计算,然后得到规律从第4次开始,偶数次运算输出的结果是1,奇数次运算输出的结果是3,然后解答即可.【详解】第1次,12×81=27,第2次,12×27=9,第3次,12×9=3,第4次,12×3=1,第5次,1+2=3,第6次,12×3=1,…,依此类推,偶数次运算输出的结果是1,奇数次运算输出的结果是3,∵2019是奇数,∴第2019次输出的结果为3,故选:A.【点睛】本题考查了代数式求值,根据运算程序计算出从第4次开始,偶数次运算输出的结果是1,奇数次运算输出的结果是3是解题的关键.9.为调查学生对国家“一带一路”战略的知晓率,某市一所中学初中部准备调查60名学生,以下样本具有代表性的是()A.全校男生中随机抽取60名B.七年级学生中随机抽取60名C.全校少先队员中随机抽取60名D.七、八、九年级分别随机抽取20名学生【答案】D【解析】抽取样本注意事项就是要考虑样本具有广泛性与代表性,所谓代表性,就是抽取的样本必须是随机的,即各个方面,各个层次的对象都要有所体现.【详解】解:A、全校男生中随机抽取60名,抽查不具有代表性,对抽取的对象划定了范围,因而不具有代表性;B、七年级学生中随机抽取60名,抽查不具有代表性,对抽取的对象划定了范围,因而不具有代表性;C、全校少先队员中随机抽取60名,抽查不具有代表性,对抽取的对象划定了范围,因而不具有代表性;D、七、八、九年级分别随机抽取20名学生进行调查具有代表性,故此选项正确.故选D.【点睛】此题主要考查了抽样调查的可靠性,正确理解抽样调查的意义是解题关键.10.下列语句中正确的是()A.的平方根是B.的平方根是C.的算术平方根是D.的算术平方根是【答案】D【解析】A选项:-9没有平方根,故是错误的;B选项:9的平方根有3和-3,故是错误的;C选项:9的算术平方根是3,故是错误的;D选项:9的算术平方根是3,故是正确的;故选D.二、填空题题11.小明设计了如下的一组数:2,1,3,x,7,y,23,z,……,满足“从第三个数起,前两个数依次为a,b,紧随其后的数就是2a﹣b”,例如这组数中的第三个数“3”是由“2×2﹣1”得到的,那么这组数中z的值为_____.【答案】﹣1【解析】试题分析:根据“从第三个数起,前两个数依次为a、b,紧随其后的数就是2a﹣b”,首先建立方程2×3﹣x=7,求得x,进一步利用此规定求得y即可.解:解法一:常规解法∵从第三个数起,前两个数依次为a、b,紧随其后的数就是2a﹣b∴2×3﹣x=7∴x=﹣1则2×(﹣1)﹣7=y解得y=﹣1.解法二:技巧型∵从第三个数起,前两个数依次为a 、b ,紧随其后的数就是2a ﹣b∴7×2﹣y=23∴y=﹣1故答案为﹣1.点评:此题考查数字的变化规律,注意利用定义新运算方法列方程解决问题.12.在原有运算法则中,我们补充新运算法则“*”如下:当a≥b 时,a*b =(﹣b )2;当a <b 时,a*b =﹣(a 2)1.则当x =2时,(x*1)x ﹣(x*1)=_____.【答案】2【解析】首先认真分析找出规律,再将x=2代入进行计算即可.【详解】解:∵当a≥b 时,a*b =(﹣b )2;当a <b 时,a*b =﹣(a 2)1,当x =2时,(x*1)x ﹣(x*1)=(2*1)×2﹣(2*1)=(﹣1)2×2﹣[﹣(22)1]=1×2﹣(﹣64)=2+64=2,故答案为:2.【点睛】此题考查有理数的混合运算,解题关键在于根据a,b 的大小进行计算.13.化简()()2-3-34-2x y x y 结果为__________________.【答案】103x y -+【解析】先将括号去掉,然后进一步化简合并即可.【详解】原式=23126103x y x y x y --+=-+,故答案为:103x y -+.【点睛】本题主要考查了整式的混合运算,熟练掌握相关方法是解题关键.14.已知关于x 的不等式3x - m+1>0的最小整数解为2,则实数m 的取值范围是___________.【答案】4<7m ≤【解析】先用含m 的代数式表示出不等式的解集,再根据最小整数解为2即可求出实数m 的取值范围.【详解】∵3x - m+1>0,∴3x> m -1,∴x>-13m , ∵不等式3x - m+1>0的最小整数解为2, ∴1≤-13m <3, 解之得4<7m ≤.故答案为:4<7m ≤.【点睛】本题考查了一元一次不等式的解法,根据最小整数解为2列出关于m 的不等式是解答本题的关键. 15.据统计,2018年上海市常住人口数量约为24237800人,用科学计数法表示上海市常住人口数是__________.(保留4个有效数字)【答案】72.42410⨯【解析】根据科学记数法的表示形式为10n a ⨯的形式,其中110a ≤<,n 为整数,结合有效数字的计算方法是:从左边第一个不是0的数字起,后面所有的数字都是有效数字,即可求出结果.【详解】解:将24237800用科学记数法表示为72.4237810⨯,∴772.4237810 2.42410≈⨯⨯(保留4个有效数字),故答案为:72.42410⨯.【点睛】此题考查科学记数法的表示方法.科学记数法的表示形式为10n a ⨯的形式,其中110a ≤<,n 为整数,表示时关键要正确确定a 的值以及n 的值.16.比较大小:π (填“>”,“=”,“<”).【答案】<【解析】求出π2的平方的值比较即可.【详解】解:∵π2<10,∴π故答案为:<.【点睛】本题考查了实数的大小比较的应用,能正确比较无理数的大小是解此题的关键.17.为了了解全校九年级1000名同学的身高情况,随机抽查了160名同学的身高情况,在这个问题中,样本的容量是__________【答案】160【解析】样本容量是指样本中个体的数目,根据定义即可解答.【详解】根据定义,样本容量是指样本中个体的数目,随机抽查了160名同学的身高情况,所以样本容量为160,故答案为160.【点睛】此题考查了样本容量的定义,属于基础题,难度低,熟练掌握样本容量的定义是解题关键.三、解答题18.今年春季我县大旱,导致大量农作物减产,下图是一对农民父子的对话内容,请根据对话内容分别求出该农户今年两块农田的产量分别是多少千克?【答案】该农户今年第一块田的花生产量是20千克,第二块田的花生产量是37千克.【解析】试题分析:.解:设去年第一块田的花生产量为x 千克,第二块田的花生产量为y 千克,根据题意,得470(180%)(190%)57x y x y +=⎧⎨-+-=⎩ 解得 100370x y =⎧⎨=⎩100(180%)20⨯-=,370(190%)37⨯-=答:该农户今年第一块田的花生产量是20千克,第二块田的花生产量是37千克.考点:二元一次方程组应用点评:本题难度较低,主要考查学生对二元一次方程组应用知识点的掌握.为中考常考题型,要求学生牢固掌握解题技巧.19.如图,已知AB CD ∕∕,,130110A C ∠=∠=︒︒,求APC ∠的度数.。
浙江省杭州市上城区2018学年第二学期七年级数学期末卷及详细解答

上城区2018学年第二学期期末教学质量监测七年级数学考生须知:1. 本试卷分试题卷和答题卷两部分。
满分为120分,考试时间为120分钟。
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试题卷一、选择题:本大题有10个小题,每小题3分,共30分.在每小题给出的四个选项中,只有一项是符合题目要求的.1. 将0.000617用科学记数法表示,正确的是( )A.6.17×10-6B.6.17×10-4C.6.17×10-5D.6.17×10-2 2. 要了解一所中学七年级学生的每周课外阅读情况,以下方法中比较合理的是( )A. 调查七年级全体学生的每周课外阅读情况B. 调查其中一个班的学生每周课外阅读情况C. 调查七年级全体男生的每周课外阅读情况D. 调查七年级每班学号为3的倍数的学生的每周课外阅读情况 3. 下列四个方程中是二元一次方程的为( ) A.x x =-14 B.21=+xx C.132=-y x D.8=xy 4.下列现象属于数学中平移变换的是( )A.把打开的书本合上B.电梯从底楼升到顶楼C.碟片在光驱中运行D.闹钟钟摆的运动 5.下列各式由左边到右边的变形中,是因式分解的是( ) A.()223y x x xy x -=- B.()22112+-=---x x xC.()44442-+=-+x x x xD.()222224y x y xy x +=++6.下列计算中,正确的是( )A.()23x xy y x =÷B.632x x x =⋅C.()222y x y x +=+ D.()642x x =7. 如图,用数字表示的各角中,∠1的同位角为( )A.∠2B.∠3C.∠4D.∠58.若关于x 的分式方程62312-=--x m x x 有增根,则m 的值是( ) A.m =3 B.m =2 C.m =2± D.m =3± 9.如果多项式6x 2- kx -2因式分解后有一个因式为3x -2,则k =( ) A.1 B.-1 C.-4 D.710. 已知关于x ,y 的方程组⎩⎨⎧+=-=+m y mx my x 27,将此方程组的两个方程左右两边分别对应相加,得到一个新的方程,当m 每取一个值时,就有一个方程,这些方程有一个公共解,这个公共解为( )⎩⎨⎧-==14y x B.⎩⎨⎧-==41y x C.⎩⎨⎧-==45y x D.⎩⎨⎧=-=45y x 二、填空题:本大题有6个小题,每小题4分,共24分 11、化简: =______12、已知 ,用含 的代数式表示 为________ 13、要使分式有意义, 的取值应满足__________ 14、若 则15、沙滩上有一群小朋友在玩沙子,女孩戴着红色小帽,男孩戴着黄色小帽,如果每位男孩看到的红色小帽比黄色小帽多6个,而每位女孩看到的红色小帽比黄色小帽多两倍,设女孩 人,男孩 人,根据题意可列出二元一次方程组_______________16、两块含30°角的三角尺叠放如图所示,现固定三角尺ABC 不动,将三角尺DEC 绕顶点C 顺时针转动,使两块三角尺至少有一组边互相平行,且点D 在直线BC 的上方,则∠BCD 所有可能符合条件的度数为_______________三、解答题:本大题有7个小题,共66分.解答应写出文字说明、证明过程或推演步骤.17、(本题6分)因式分解:(1)(2)18、(本题8分)(1)计算:(2)先化简再求值:,其中a=-1,b=-219、(本题8分)端午节到了,某商场出售A,B两种粽子礼盒,其中B种礼盒单价是A种礼盒的1.5倍.已知用2000元购买A种礼盒的数量,比用2400元购买B种礼盒的数量多5盒.求A、B两种粽子礼盒的单价分别是多少元?20、(本题10分)某大学举行了百科知识竞赛,为了解此次竞赛成绩的情况,随机抽取部分参赛学生的成绩,整理并制作出如下不完整的统计表和统计图,请根据图表信息解答以下问题:(1)表中a=_______;(2)补全频数分布直方图;(3)计算扇形统计图中“C”对应的圆心角度数;(4)该大学共有240人参加竞赛,若成绩在80分以上(包括80分)的为“优”等,根据抽样结果,估计该校参赛学生成绩达到“优”等的人数?21、(本题10分)我国南宋数学家杨辉用三角形解释二项和的乘方规律,称之为“杨辉三角”.这个三角形给出了(n=1,2,3,4...)的展开式的系数规律(按a的次数由大到小的顺序):1 11 2 11 3 3 11 4 6 4 1............(1)请依据上述规律,写出的展开式.(2)求展开式中含的项的系数.22、(本题12分)工厂接到订单生产如图所示的巧克力包装盒子,每个盒子由3个长方形侧面和2个正三角形底面组成,仓库有甲、乙两种规格对的纸板共2600张,其中甲种规格的纸板刚好可以裁出4个侧面(如图①),乙种规格的纸板可以裁出3个底面和2个侧面(如图②),裁剪后边角料不再利用.(1)若裁剪出的侧面和底面恰好全部用完,问两种规格的纸板各有多少张?(2)一共能生产多少个巧克力包装盒?23.(本题12分)已知,如图①,点D,E,F,G是△ABC三边上的点,且FG//AC, (1)若∠EDC=∠FGC,试判断DE与BC是否平行,并说明理由.(2)如图②,点M、N分别在边AC、BC上,且MN//AB,连结GM.若∠A=60°,∠C=55°,∠FGM=4∠MGC,求∠GMN的度数.(3)若点M、N分别在射线AC、BC上,且MN//AB,连结GM.若∠A=α,∠ACB=β,∠FGM=n∠MGC,直接写出∠GMN的度数(用含α,β,n的代数式表示).上城区2018学年第二学期期末教学质量监测七年级 数学二、选择题:本大题有10个小题,每小题3分,共30分.在每小题给出的四个选项中,只有一项是符合题目要求的.4. 将0.000617用科学记数法表示,正确的是( )A.6.17×10-6B.6.17×10-4C.6.17×10-5D.6.17×10-2 【考点】:科学计数法 故选:B5. 要了解一所中学七年级学生的每周课外阅读情况,以下方法中比较合理的是( ) E. 调查七年级全体学生的每周课外阅读情况 F. 调查其中一个班的学生每周课外阅读情况 G. 调查七年级全体男生的每周课外阅读情况H. 调查七年级每班学号为3的倍数的学生的每周课外阅读情况 【考点】:调查方法 故选:D6. 下列四个方程中是二元一次方程的为( )A. x x =-14B.21=+xx C.132=-y x D.8=xy 【考点】:二元一次方程的定义 故选:C4.下列现象属于数学中平移变换的是( )A.把打开的书本合上B.电梯从底楼升到顶楼C.碟片在光驱中运行D.闹钟钟摆的运动 【考点】:平移 故选:B5.下列各式由左边到右边的变形中,是因式分解的是( )A.()223y x x xy x -=- B.()22112+-=---x x xC.()44442-+=-+x x x x D.()222224y x y xy x +=++【考点】:因式分解故选:B6.下列计算中,正确的是( )A.()23x xy y x =÷ B.632x x x =⋅ C.()222y x y x +=+ D.()642x x =【考点】:整式乘除A 、2x B 、5x C 、222y xy x ++ D 、8x故选:A8. 如图,用数字表示的各角中,∠1的同位角为( )A.∠2B.∠3C.∠4D.∠5 【考点】:三线八角 故选:B8.若关于x 的分式方程62312-=--x m x x 有增根,则m 的值是( ) A.m =3 B.m =2 C.m =2± D.m =3± 【考点】:分式方程的增根问题 故选:C9.如果多项式6x 2-kx -2因式分解后有一个因式为3x -2,则k =( ) A.1 B.-1 C.-4 D.7 【考点】:因式分解 故选:A11. 已知关于x ,y 的方程组⎩⎨⎧+=-=+m y mx my x 27,将此方程组的两个方程左右两边分别对应相加,得到一个新的方程,当m 每取一个值时,就有一个方程,这些方程有一个公共解,这个公共解为( )⎩⎨⎧-==14y x B.⎩⎨⎧-==41y x C.⎩⎨⎧-==45y x D.⎩⎨⎧=-=45y x 【考点】:二元一次方程组【解析】①+②得:x+my+mx-y-m-9=0∵m 每取一个值,就有一个方程,这些方程有公共解。
2018年杭州市xx中学七年级下期末模拟测试卷含答案

2018年杭州市XX中学七年级下册期末模拟测试卷第一部分听力(共两节,15题,满分30分)第二部分阅读理解(共两节,满分50分)第一节(共20小题,每小题2分,满分40分)阅读下列短文,从每题所给的四个选项(A.B.C和D)中选出最佳选项。
AJack is the name of a game. It is quite popular with children. To play jacks, you will need a small ball and ten small metal objects (物体) called jacks.The rules for this game are quite easy. To begin with, put the ten jacks on the floor or ground in front of you. Toss the ball high, pick up one jack and then catch the ball. Keep the jack in your hand and go on to pick up the other jack one at a time. You lose your turn if you do not catch the ball, or if you do not pick up a jack, or if you drop (掉) any of the jacks from your hand.When you finish all the ten jacks, you now try to do the same thing again but with two jacks at one time. This is more difficult, of course. You lose your turn if you make any of the above three mistakes (错误) or if you do not pick up two jacks each time.16.To play jacks is ___________.A. difficult for boysB. interesting for childrenC. difficult for girlsD. interesting for old people17.The word “toss” here means __________.A. dropB. catchC. throwD. pick18.If you want to finish the first and second parts of the game, you have to pick up jacks __________.A. ten timesB. fifteen timesC. twenty timesD. thirty times19.The jacks are made of _________.A. paperB. glassC. metalD. water20.After you pick up the first ten jacks, the game becomes more difficult because you must pick up _________ at a time.A. two jacksB. four jacksC. three jacksD. only oneBThere are many different kinds of disasters around the world. As an adult you know what to do during a disaster, but what about the children? Some adults think it would probably never happen to them, so they don’t teach their children what to do. Before it’s too late, here are ways to help you prepare your child for a disaster:Educate: It is always good to let your child know about possible disasters. This doesn’t mean children have to live in fear. When teaching them about disasters, keep the conversation positive(积极的)by telling them there is a solution(解决办法)to the disaster. Keep the conversations short, allow for questions and answer honestly.Prepare: Always be prepared, that is the best advice for children. For example, when preparing for bad weather, get the tools you need, like candles, radios, food, water and medicine. Teach your child what is needed in certain disasters so that they know what is available for them, if ever needed.Plan: You should always have a plan for you and your child for any dangerous situation. Write out a simple list that they can read. The plan could start with “listen to an adult’s advice and/or call 119”.Practice: Once you have got the correct safety tools and worked out the right plan, practice every few months. Practicing what to do during a disaster with your child will help them if the time comes.Disasters can’t be avoided but they can be lessened(减轻)once you are prepared and ready for one.21. What does the word ‘disaster’ mean?A. 命运B. 灾难C. 演习D. 倾销22. What should adults teach children?A. When disasters will happen.B. Why disasters are dangerous.C. What to do for a disaster.D. How to avoid a disaster.23. What is the correct thing to do for adults?A. Have positive conversations with children.B. Try not to talk about disasters with children.C. Make the children scared of disasters.D. Ask children lots of questions.24. What’s the most important thing for children?A. Always ask adults for help.B. Always be prepared for a disaster.C. Always listen to an adult’s advice.D. Always remember w here the tools are.25. What is NOT suggested doing?A. Remembering what is needed in certain disasters.B. Getting the children to know the plan well.C. Helping people in disaster areas.D. Getting radios for bad weather.CNowadays, cell phones are part of our lives. Many people have cell phones. They can help us easily find people anywhere at any time. However, using cell phones too often may cause cancer(癌症). It’s reported that people who use a cell phone for 10 years or more may get brain cancer.The suggestions below may help you reduce(减少) the risk of cancer:When using your cell phone, try to keep it away from your body as much as possible. Don’t put it on the bedside table when you go to sleep.When you’re on the cell phone, use the speaker(扬声器). In this way, you have just1/100th of the contact(接触) with radiation you have when you hold it to your ear. An earphone is also a good idea.Try to keep your conversations short. If you need to talk longer, use an ordinary phone instead.Change ears w hen you’re using your cell phone. Before putting it to your ear, wait until the person you are calling picks up the phone.Your phone gives out radiation when you talk or send messages, but not when you’re listening or getting messages. Listening more and talking less can lower the risk of cancer.Do not use your cell phone when the signal(信号) is weak or when moving at a high speed, for example in a car or on a train. At high speeds your phone is trying to pick up signals, and this increases the radiation it gives out.26. According to the text, using cell phones too much may cause ___________.A. toothacheB. cancerC. heart diseaseD.stomachache27. The underlined word “radiation” in Paragraph 4 probably means “______” in Chinese.A. 辐射B. 电池C. 网络D. 手机28. You’d better______________.A. use your cell phone when the signal is weakB. use your cell phone on a high-speed trainC. change ears when you’re using your cell phoneD. never use your cell phones.29. Which of the following is TRUE according to the textA. Using an earphone is a good way to reduce the radiation.B. You can put your cell phone on the bedside table when you go to sleep.C. Listening less and talking more can lower the risk of cancer.D. Using an earphone is a bad way to reduce the radiation.30. The purpose of the text is to tell us how to properly ____________.A. buy a cell phoneB. use a cell phoneC. repair a cell phoneD. sell a cell phoneDWhat should we do if one of our classmates suddenly falls ill or gets hurt?Here are some steps you should follow.But always remember to look for medical care after first aid(急救)if the wound is serious.Broken bones(骨头):Take away clothing from the wound.Use an ice pack.Don't move the hurt body part while waiting for the doctor to arrive.Animal bites(咬伤):Wash the bite area with soap and water.Pack the wound with a clean cloth if it is bleeding.If the bleeding has stopped,cover the area with a bandage and take the person to the hospital.Make sure you remember what kind of animal it is so the doctor can find the right way to treat him or her at once.Fainting(昏厥):Have him or her lie with feet lifted a little.Don't move the body if you think there might be wounds from the fall.Make sure he or she can breathe and let in fresh air.Clean the person's face with a cool cloth.Nosebleeds:Have the person sit up with his or her head tilted(倾斜)forward a little.Do not have the person tilt his or her head back because this may cause heavy breathing or coughing.Pinch(捏) the lower part of the nose for at least 10minutes.31.What should we do first when an animal bite happens?A.Put an ice pack on the wound.B.Wash the bite area with soap and water.C.Try to stop the bleeding with a clean cloth.D.Take the hurt person to the hospital.32.When dealing with the problems of _______,we shouldn't move the hurt.A.broken bones and animal bites B.animal bites and nosebleedsC.broken bones and fainting D.fainting and nosebleeds33.Which of the following is not right when a boy's nose bleeds?A.Let his head not tilt back. B.Let his head tilt forward a little.C.Let him sit up. D.Pinch his nose for less than 10minutes.34.Which part of a magazine may the passage come from?A.Lifestyle.B.Health. C.Sports. D.Education.35.What's the main idea of the passage?A.First aid for some accidental wounds.B.Steps of looking for medical care.C.Advice on ways not to get hurt. D.Ways to ask for help in getting hurt.第二节(共 5 小题,每小题 2 分,满分 10 分)请根据的小标题,从下面的描述中找出与其相匹配的选项。
浙江省杭州市余杭区2018-2019学年第二学期期末七年级语文试卷答案

2018学年第二学期期末教学质量调研七年级语文参考答案及评分标准一、积累(23分)1.①琐②稠③嵌④躁(4分,各1分)2.示例一:“善于”作重音处理比较好。
“善于”是指在某方面具有特长的意思,在句中有强调作用。
示例二:“撒娇”作重音处理比较好。
“撒娇”在这里是拟人的说法,强调春的活泼可爱。
(4分,从词的特点及作用角度回答,意对即可)3.B(3分)4.(1)明月来相照(2)凭君传语报平安(3)黄梅时节家家雨(4)落红不是无情物(5)草色入帘青往来无白丁(5)花之隐逸者也花之君子者也(8分,每空1分,有错则该空不得分)5.①蝶②泉③苔④藻(4分,各1分)二、阅读(57分)(一)名著阅读6.示例:曹先生,待人宽和,被祥子认为是“圣人”,是祥子的雇主;刘四爷,人和车行的老板,为人苛刻,是祥子的雇主;虎妞,车厂老板刘四爷的女儿,粗俗凶悍,是祥子的妻子。
(6分,各2分)(二)现代文阅读7.两座雕像和五年前相比都改变了姿势,女雕像两膝微屈,一只手伸向脚边,男雕像则向前跨了一步,仿佛在庇护女雕像。
(4分)8. (1)“呼吸急促,呆若木鸡”等词,写出了他初见雕像眼睛时的震惊;(2)“两眼闪闪发光”“泛着淡淡的红晕”,反映了他发现雕像变化时的激动和兴奋。
(6分,各3分)9.示例:费多罗夫因为雕像脚上采集回来的标本引起爆炸而“罹难”,表明了雕像材料的特殊性,为下文雕像会改变姿势作了铺垫。
(4分)10. 第⑧节在结构上起到承上启下的作用,是对“五年前”插叙内容的归结,又很自然地将叙述拉回到“现在”,使情节继续向前发展。
(3分,意思符合即可)11.小说结尾对太阳余晖中沙漠风光的描写,画面感十足;最终没有交代两尊雕像的命运,给读者留下了悬念,又点出了“时间”的永恒,引人深思。
(4分)12.略。
(10分,围绕关键词,从感受和表达两个角度评分;可分等级评分,一等9-10分,二等6-8分,三等3-5分,四等1-2分。
)(三)古诗文阅读13.紧张忙碌(2分)14.“也”字把农村儿童从小热爱劳动,天真烂漫的形象刻画了出来,富有生活情趣,也给全诗增添了活泼轻松的气氛。
2018学年第二学期七年级杭州市科学期末试卷

七年级下《科学》期末质量检测卷• 第1页(共6页)2018学年第二学期七年级期末教学质量调研科学试题卷考试须知:1.本科目试卷分试题卷和答题卷两部分。
满分120分,考试时间90分钟。
2.答题前,必须在答题卷的密封区内填写姓名、考号。
3.所有答案都必须做在答题卷标定的位置上,务必注意试题序号和答题序号相对应。
4.考试结束后,只需上交答题卷。
(g=10N/kg)试题卷一、选择题(每小题只有一个选项符合题意,每题2分,共50分)1.下列说法中正确的是( )A .卫星能够拍摄到地球,是因为地球是光源B .站在岸边看到水中的鱼,是光的反射现象C .光在真空中的传播速度为340m/sD .以地球为参照物,月球是绕地运动的2.如图所示,关于下列实验说法不正确的是( )A .将发声的音叉与面颊接触,有被振“麻”的感觉,说明声音是由物体振动产生的B .放在真空罩里手机只见指示灯闪烁,听不见铃声说明声音只能通过空气传播C .拿一张硬纸片,让它在木梳齿上划过,快和慢会使声音的音调不同D .周围的击掌声会惊动鱼缸中的金鱼,说明声音可以在空气和水中传播3.关于力的概念,下列说法正确的是( )A .只有一个物体也能产生力的作用B .物体受到一个力的作用,一定有一个施力物体的存在C .彼此不接触的物体之间不可能有力的作用D .彼此接触的物体之间一定有力的作用4.如图所示,用力击打一摞棋子中的一个,该棋子飞出而上面的棋子落下。
以下说法正确的是( )A .棋子被击打出去是因为力可以改变物体的形状B .击打出去的棋子能飞得很远是因为受到惯性力作用C .击打前,最上面的一枚棋子静止时所受的重力和支持力是一对平衡力D .击打前,最下面的棋子所受的压力和支持力是一对相互作用力5.下列属于匀速直线运动的是( )A .钟表指针匀速转动B .某段时间内火车在平直的轨道上做快慢不变地运动C .百米赛跑运动员在整个比赛过程中的运动D .早上走路去学校时学生的运动七年级下《科学》期末质量检测卷• 第2页(共6页)6.在同一水平桌面上,放着底面积相同的量筒和量杯,现分别注入质量相同的水(水未溢出),水对量筒、量杯底部的压强分别为P 1、P 2,则( )A .P 1>P 2B .P 1=P 2C .P 1<P 2D .无法判断7.视觉的形成分为两步骤,下面正确的是( )A .光通过晶状体等折射后在视网膜成像;在大脑皮层视觉中枢形成视觉B .光通过晶状体等折射后在视网膜成像,在感光细胞上形成视觉C .光通过晶状体、玻璃体折射后;在视神经上成像并形成视觉D .光通过晶状体等折射后在大脑皮层上成像并形成视觉8.下列关于光现象及应用的说法中正确的是( )A .用手机扫二维码拍照时,应使二维码位于手机镜头的2倍焦距以内B .投影仪在屏幕上的像相对于物体是正立、放大的实像,光在屏幕上发生了镜面反射C .岸边的人在水中所成的“倒影”是光的折射形成的D .近视眼睛需要戴凹透镜来纠正9.如图所示,一束光线由介质Ⅰ射入介质Ⅱ,下列说法中正确的是( )A .α为入射角,γ为折射角B .α为入射角,β 为折射角C .如果角δ增大5o ,则角β也一定增大5oD .入射光线AO 与折射光线OB 一定在同一平面内10.杭州市区哈啰共享单车几乎遍布了每个公交站点,极大方便了市民的出行。
2018年杭州市七年级下期末模拟测试卷含答案

2018-2019年七年级下册期末模拟测试卷第一部分听力(共两节,15题,满分30分)第二部分阅读理解(共两节,满分50分)第一节(共20小题,每小题2分,满分40分)阅读下列短文,从每题所给的四个选项(A.B.C和D)中选出最佳选项。
AJack is the name of a game. It is quite popular with children. To play jacks, you will need a small ball and ten small metal objects (物体) called jacks.The rules for this game are quite easy. To begin with, put the ten jacks on the floor or ground in front of you. Toss the ball high, pick up one jack and then catch the ball. Keep the jack in your hand and go on to pick up the other jack one at a time. You lose your turn if you do not catch the ball, or if you do not pick up a jack, or if you drop (掉) any of the jacks from your hand.When you finish all the ten jacks, you now try to do the same thing again but with two jacks at one time. This is more difficult, of course. You lose your turn if you make any of the above three mistakes (错误) or if you do not pick up two jacks each time.16.To play jacks is ___________.A. difficult for boysB. interesting for childrenC. difficult for girlsD. interesting for old people17.The word “toss” here means __________.A. dropB. catchC. throwD. pick18.If you want to finish the first and second parts of the game, you have to pick up jacks __________.A. ten timesB. fifteen timesC. twenty timesD. thirty times19.The jacks are made of _________.A. paperB. glassC. metalD. water20.After you pick up the first ten jacks, the game becomes more difficult because you must pick up _________ at a time.A. two jacksB. four jacksC. three jacksD. only oneBThere are many different kinds of disasters around the world. As an adult you know what to do during a disaster, but what about the children? Some adults think it would probably never happen to them, so they don’t teach their children what to do. Before it’s too late, here are ways to help you prepare your child for a disaster:Educate: It is always good to let your child know about possible disasters. This doesn’t mean children have to live in fear. When teaching them about disasters, keep the conversation positive(积极的)by telling them there is a solution(解决办法)to the disaster. Keep the conversations short, allow for questions and answer honestly.Prepare: Always be prepared, that is the best advice for children. For example, when preparing for bad weather, get the tools you need, like candles, radios, food, water and medicine. Teach your child what is needed in certain disasters so that they know what is available for them, if ever needed.Plan: You should always have a plan for you and your child for any dangerous situation. Write out a simple list that they can read. The plan could start with “listen to an adult’s advice and/or call 119”.Practice: Once you have got the correct safety tools and worked out the right plan, practice every few months. Practicing what to do during a disaster with your child will help them if the time comes.Disasters can’t be avoided but they can be lessened(减轻)once you are prepared and ready for one.21. What does the word ‘disaster’ mean?A. 命运B. 灾难C. 演习D. 倾销22. What should adults teach children?A. When disasters will happen.B. Why disasters are dangerous.C. What to do for a disaster.D. How to avoid a disaster.23. What is the correct thing to do for adults?A. Have positive conversations with children.B. Try not to talk about disasters with children.C. Make the children scared of disasters.D. Ask children lots of questions.24. What’s the most important thing for children?A. Always ask adults for help.B. Always be prepared for a disaster.C. Always listen to an adult’s advice.D. Always remember where the tools are.25. What is NOT suggested doing?A. Remembering what is needed in certain disasters.B. Getting the children to know the plan well.C. Helping people in disaster areas.D. Getting radios for bad weather.CNowadays, cell phones are part of our lives. Many people have cell phones. They can help us easily find people anywhere at any time. However, using cell phones too often may cause cancer(癌症). It’s reported that people who use a cell phone for 10 years or more may get brain cancer.The suggestions below may help you reduce(减少) the risk of cancer:When using your cell phone, try to keep it away from your body as much as possible. Don’t put it on the bedside table when you go to sleep.When you’re on the cell phone, use the speaker(扬声器). In this way, you have just 1/100th of the contact(接触) with radiation you have when you hold it to your ear. An earphone is also a good idea.Try to keep your conversations short. If you need to talk longer, use an ordinary phone instead.Change ears when you’re using your cell phone. Before putting it to your ear, wait until the person you are calling picks up the phone.Your phone gives out radiation when you talk or send messages, but not when you’re listening or getting messages. Listening more and talking less can lower the risk of cancer.Do not use your cell phone when the signal(信号) is weak or when moving at a high speed, for example in a car or on a train. At high speeds your phone is trying to pick up signals, and this increases the radiation it gives out.26. According to the text, using cell phones too much may cause ___________.A. toothacheB. cancerC. heart diseaseD.stomachache27. The underlined word “radiation” in Paragraph 4 probably means “______” in Chinese.A. 辐射B. 电池C. 网络D. 手机28. You’d better______________.A. use your cell phone when the signal is weakB. use your cell phone on a high-speed trainC. change ears when you’re using your cell phoneD. never use your cell phones.29. Which of the following is TRUE according to the textA. Using an earphone is a good way to reduce the radiation.B. You can put your cell phone on the bedside table when you go to sleep.C. Listening less and talking more can lower the risk of cancer.D. Using an earphone is a bad way to reduce the radiation.30. The purpose of the text is to tell us how to properly ____________.A. buy a cell phoneB. use a cell phoneC. repair a cell phoneD. sell a cell phoneDWhat should we do if one of our classmates suddenly falls ill or gets hurt?Here are some steps you should follow.But always remember to look for medical care after first aid(急救)if the wound is serious.Broken bones(骨头):Take away clothing from the wound.Use an ice pack.Don't move the hurt body part while waiting for the doctor to arrive.Animal bites(咬伤):Wash the bite area with soap and water.Pack the wound with a clean cloth if it is bleeding.If the bleeding has stopped,cover the area with a bandage and take the person to the hospital.Make sure you remember what kind of animal it is so the doctor can find the right way to treat him or her at once.Fainting(昏厥):Have him or her lie with feet lifted a little.Don't move the body if you think there might be wounds from the fall.Make sure he or she can breathe and let in fresh air.Clean the person's face with a cool cloth.Nosebleeds:Have the person sit up with his or her head tilted(倾斜)forward a little.Do not have the person tilt his or her head back because this may cause heavy breathing or coughing.Pinch(捏) the lower part of the nose for atleast 10minutes.31.What should we do first when an animal bite happens?A.Put an ice pack on the wound.B.Wash the bite area with soap and water.C.Try to stop the bleeding with a clean cloth.D.Take the hurt person to the hospital.32.When dealing with the problems of _______,we shouldn't move the hurt.A.broken bones and animal bites B.animal bites and nosebleedsC.broken bones and fainting D.fainting and nosebleeds33.Which of the following is not right when a boy's nose bleeds?A.Let his head not tilt back. B.Let his head tilt forward a little.C.Let him sit up. D.Pinch his nose for less than10minutes.34.Which part of a magazine may the passage come from?A.Lifestyle.B.Health. C.Sports. D.Education.35.What's the main idea of the passage?A.First aid for some accidental wounds.B.Steps of looking for medical care.C.Advice on ways not to get hurt. D.Ways to ask for help in getting hurt.第二节(共 5 小题,每小题 2 分,满分 10 分)请根据的小标题,从下面的描述中找出与其相匹配的选项。
【期末真题_2018】浙江省杭州地区2017-2018学年七年级下学期教学质量检测英语试题

2017-2018学年第二学期七年级英语教学质量检测(二)第一部分听力(共两节, 满分3分)第一节(共5小题, 每小题2分, 满分10分)听下面 5 段对话, 每段对话后有一个小题, 从题中所给的A、B、 C 三个选项中选出最佳选项, 并标在试题的相应位置。
听完每段对话后, 你都有10 秒钟的时间来回答有关小题和阅读下一小题。
每段对话仅读一遍。
1. Which place is across from the library?A. The park.B. The post office.C. The Sixth Avenue.2. What is Uncle Joe doing?A. Playing basketball.B. Reading a newspaper.C. Cleaning the room.3. Where is the big bookstore?A. Near the school.B. Next to the cinema.C. Across from the cinema.4. How far is it from her home to school?A. About 4 kilometers.B. About 14 kilometers.C. About 40 kilometers.5. What does Lucy look like?D. Short with short black hair.E. Tall with long brown hair.F. Of medium height with curly blond hair.第二节(共10 小题, 每小题2 分, 满分20分)听下面 2 段对话和1 段独白。
每段对话或独白后有几个小题, 从题中所给的A、B、C 三个选项中选出最佳选项, 并标在试卷的相应位置。
听每段对话或独白前, 你将有时间阅读各个小题, 每小题 5 秒钟;听完后,各小题给出 5 秒钟的做答时间。
2018学年浙江省杭州市下城区第二学期期末七年级数学考试试卷及详解

2018学年下城区第二学期期末七年级考试试卷数 学各位同学:1.本试卷满分120分,考试时间为100分钟。
2.答题前,必须在答题纸指定位置填写学校、姓名、座位号和准考证号。
3.必须在答题纸的对应答题位置上答题,写在其他地方无效,答题方式详见答题纸上的说明。
4.不能使用计算器;考试结束后,上交答题纸。
试题卷一、选择题(本大题有10个小题,每小题3分,共30分)。
在每小题给出的选项中,只有一项是符合题目要求的。
1.若2x 6333⨯=,则x=( ) (A )4 (B )5(C )6 (D )7 【答案】A【解析】同底数幂相乘,底数不变,指数相加 2+x=6 x=4 故选:A2.下列是二元一次方程的是( ) (A )1+2x y= (B )2xy = (C )2x y += (D )222x y += 【答案】C【解析】二元一次方程要有两个未知数,未知数最高次数为1。
故选C.3. 在“生命安全”主题教育活动中,为了解甲、乙、丙、丁四所学校学生对生命安全知识掌握情况,小丽制定了如下方案,你认为最合理的是( ) (A )抽取甲校初二年级学生进行调查 (B )在乙校随机抽取200名学生进行调查 (C )随机抽取甲乙两校100名老师进行调查 (D )在甲乙学校各随机抽取100名学生进行调査 【答案】D4、下列因式分解正确的是( )(A ))3)(3(92-+=+x x x (B )()()3262+-=-+x x x x(C )()y x y x 23363-=+-(D )22)1(12-=-+x x x (解答)B 5. 若分式6210-+x x 有意义,则x 的取值范围是( ) (A )x ≠3 (B )x =3 (C )x ≠-10 (D )x=-10 【答案】A.(解答)分母不能为0,则2x -6≠0,解得:x ≠3.6. 如图,说法正确的是 ( ) (A )∠A =∠1 是同位角 (B )∠A =∠2 是内错角(C )∠A =∠3 是同旁内角 (D )∠A =∠B 是同旁内角【答案】D 【解析】(A )∠A =∠1 是内错角,不对 (B )∠A =∠2 但不是内错角,不对(C )∠A =∠3 是同位角,不对 (D )∠A =∠B 是同旁内角7. 在义卖活动中,小华负责卖一种圆珠笔,第一天小华卖得60元,第二天多卖了10支,卖得75元,设小华第一天卖了x 支这种圆珠笔,则下列方程正确的是( ) (A )60x=75x−10(B ) 60x=75x+10(C )75x=60x−10(D )75x=60x+10【答案】B【解析】根据题目可得第一天圆珠笔的单价为60x ,第二天圆珠笔的单价为75x+10,由此构成等量关系.8.用四个长和宽是a ,b (a >b )的长方形拼成面积64的大正方形,中间小正方形的面积是S ,( )(A)若S=4,则ab=8(B)若S=16,则ab=10(C)若ab=12,则S=16(D)若ab=14,则S=4【答案】C(解答)S=64-4ab∴C对9.多项式(2a+1)x2+bx,其中a,b为常数()(A)若公因式为3x,则a=1(B)若公因式为5x,则a=2(C)若公因式为3x,则a=3k+1(k为整数)(D)若公因式为5x,则a=5k+1(k为整数)【答案】C【解析】公因式为3x,a=3k+1代入得,2a+1=6a+3,∴A错,B错,C对同理D错10.如图,a∥b,设∠1=(3m+10)°,∠4=(7m-30)°,()(A)若∠2=∠3,则∠2=(3m-10)°(B)若∠1=∠4,则∠3=(m+30)°(C)若∠1=2∠2=2∠3,则∠2=(3m)°(D)若∠1=∠2=∠3,∠2=(5m-10)°【答案】D ∵a ∥b∴∠1+∠3=∠2+∠4 若∠2=∠3,则∠1=∠4, ∴m =10,得不出∠2和∠3的度数 B ,C 同理若∠1=∠2=∠3,则∠1=∠2=∠3=∠4 ∴m =10∠1=∠2=∠3=∠4=40° ∴D 对二.填空题(本大题共6小题,每题4分,共24分)11.一次射击训练中,李磊共射击10发,射中8环的频率是0.4,则射中8环的频数是 . 【答案】412、计算:.___________331-=÷ (解答)9113. 分解因式:a a 43- = . 【答案】)2)(2(-+a a a(解答)a a 43-)2)(2()4(423-+=-=-a a a a a a a .14 如图,点E 在AD 的延长线上,下列四个条件:1. ∠1=∠2 2. ∠C +∠ABC =180° 3. ∠C +∠CDE 4. ∠4=∠3. 能判断AB ∥CD 的是 (填序号)【答案】1,2 【解析】1. ∠1=∠2是内错角,内错角 相等,两直线平行2. ∠C +∠ABC =180°是同旁内角,同旁内角相加等于180°,则两直线平行15 关于x 的分式方程ax−3=13的解是x=b,若a=b+1,则x= 【答案】x =−3 【解析】∵a x−3−13=0.∴3a−(x−3)3(x−3)=0. ∵x =b .∴3a−(b−3)3(b−3)=0. ∵a =b +1 . ∴3(b+1)−(b−3)3(b−3)=0. 2b+6=0 x =b =−3.16. 记a ❈b =(a +b )2-(a -b )2,若A ❈22y 1641-x =y2y2+-x x ,则A =___________(用含有x ,y 的代数式表示) 【答案】(x -2y )2 (解答)a ❈b =4ab ∴A =y 2y 2+-x x ÷22y1644-x =(x -2y )2 三、解答题(本大题有7个,共66分)。
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2018年杭州市XX中学七年级下册期末模拟测试卷第一部分听力(共两节,15题,满分30分)第二部分阅读理解(共两节,满分50分)第一节(共20小题,每小题2分,满分40分)阅读下列短文,从每题所给的四个选项(A.B.C和D)中选出最佳选项。
AJack is the name of a game. It is quite popular with children. To play jacks, you will need a small ball and ten small metal objects (物体) called jacks.The rules for this game are quite easy. To begin with, put the ten jacks on the floor or ground in front of you. Toss the ball high, pick up one jack and then catch the ball. Keep the jack in your hand and go on to pick up the other jack one at a time. You lose your turn if you do not catch the ball, or if you do not pick up a jack, or if you drop (掉) any of the jacks from your hand.When you finish all the ten jacks, you now try to do the same thing again but with two jacks at one time. This is more difficult, of course. You lose your turn if you make any of the above three mistakes (错误) or if you do not pick up two jacks each time.16.To play jacks is ___________.A. difficult for boysB. interesting for childrenC. difficult for girlsD. interesting for old people17.The word “toss” here means __________.A. dropB. catchC. throwD. pick18.If you want to finish the first and second parts of the game, you have to pick up jacks __________.A. ten timesB. fifteen timesC. twenty timesD. thirty times19.The jacks are made of _________.1A. paperB. glassC. metalD. water20.After you pick up the first ten jacks, the game becomes more difficult because you must pick up _________ at a time.A. two jacksB. four jacksC. three jacksD. only oneBThere are many different kinds of disasters around the world. As an adult you know what to do during a disaster, but what about the children? Some adults think it would probably never happen to them, so they don’t teach their children what to do. Before it’s too late, here are ways to help you prepare your child for a disaster:Educate: It is always good to let your child know about possible disasters. This doesn’t mean children have to live in fear. When teaching them about disasters, keep the conversation positive(积极的)by telling them there is a solution(解决办法)to the disaster. Keep the conversations short, allow for questions and answer honestly.Prepare: Always be prepared, that is the best advice for children. For example, when preparing for bad weather, get the tools you need, like candles, radios, food, water and medicine. Teach your child what is needed in certain disasters so that they know what is available for them, if ever needed.Plan: You should always have a plan for you and your child for any dangerous situation. Write out a simple list that they can read. The plan could start with “listen to an adult’s advice and/or call 119”.Practice: Once you have got the correct safety tools and worked out the right plan, practice every few months. Practicing what to do during a disaster with your child will help them if the time comes.Disasters can’t be avoided but they can be lessened(减轻)once you are prepared and ready for one.21. What does the word ‘disaster’ mean?A. 命运B. 灾难C. 演习D. 倾销222. What should adults teach children?A. When disasters will happen.B. Why disasters are dangerous.C. What to do for a disaster.D. How to avoid a disaster.23. What is the correct thing to do for adults?A. Have positive conversations with children.B. Try not to talk about disasters with children.C. Make the children scared of disasters.D. Ask children lots of questions.24. What’s the most important thing for children?A. Always ask adults for help.B. Always be prepared for a disaster.C. Always listen to an adult’s advice.D. Always remember where the tools are.25. What is NOT suggested doing?A. Remembering what is needed in certain disasters.B. Getting the children to know the plan well.C. Helping people in disaster areas.D. Getting radios for bad weather.CNowadays, cell phones are part of our lives. Many people have cell phones. They can help us easily find people anywhere at any time. However, using cell phones too often may cause cancer(癌症). It’s reported that people who use a cell phone for 10 years or more may get brain cancer.The suggestions below may help you reduce(减少) the risk of cancer:When using your cell phone, try to keep it away from your body as much as possible. Don’t put it on the bedside table when you go to sleep.3When you’re on the cell phone, use the speaker(扬声器). In this way, you have just1/100th of the contact(接触) with radiation you have when you hold it to your ear. An earphone is also a good idea.Try to keep your conversations short. If you need to talk longer, use an ordinary phone instead.Change ears when you’re using your cell phone. Before putting it to your ear, wait until the person you are calling picks up the phone.Your phone gives out radiation when you talk or send messages, but not when you’re listening or getting messages. Listening more and talking less can lower the risk of cancer.Do not use your cell phone when the signal(信号) is weak or when moving at a high speed, for example in a car or on a train. At high speeds your phone is trying to pick up signals, and this increases the radiation it gives out.26. According to the text, using cell phones too much may cause ___________.A. toothacheB. cancerC. heart diseaseD.stomachache27. The underlined word “radiation” in Paragraph 4 probably means “______” in Chinese.A. 辐射B. 电池C. 网络D. 手机28. You’d better______________.A. use your cell phone when the signal is weakB. use your cell phone on a high-speed trainC. change ears when you’re using your cell phoneD. never use your cell phones.29. Which of the following is TRUE according to the textA. Using an earphone is a good way to reduce the radiation.B. You can put your cell phone on the bedside table when you go to sleep.4C. Listening less and talking more can lower the risk of cancer.D. Using an earphone is a bad way to reduce the radiation.30. The purpose of the text is to tell us how to properly ____________.A. buy a cell phoneB. use a cell phoneC. repair a cell phoneD. sell a cell phoneDWhat should we do if one of our classmates suddenly falls ill or gets hurt?Here are some steps you should follow.But always remember to look for medical care after first aid(急救)if the wound is serious.Broken bones(骨头):Take away clothing from the wound.Use an ice pack.Don't move the hurt body part while waiting for the doctor to arrive.Animal bites(咬伤):Wash the bite area with soap and water.Pack the wound with a clean cloth if it is bleeding.If the bleeding has stopped,cover the area with a bandage and take the person to the hospital.Make sure you remember what kind of animal it is so the doctor can find the right way to treat him or her at once.Fainting(昏厥):Have him or her lie with feet lifted a little.Don't move the body if you think there might be wounds from the fall.Make sure he or she can breathe and let in fresh air.Clean the person's face with a cool cloth.Nosebleeds:Have the person sit up with his or her head tilted(倾斜)forward a little.Do not have the person tilt his or her head back because this may cause heavy breathing or coughing.Pinch(捏) the lower part of the nose for at least 10minutes.31.What should we do first when an animal bite happens?A.Put an ice pack on the wound.B.Wash the bite area with soap and water.5C.Try to stop the bleeding with a clean cloth.D.Take the hurt person to the hospital.32.When dealing with the problems of _______,we shouldn't move the hurt.A.broken bones and animal bites B.animal bites and nosebleedsC.broken bones and fainting D.fainting and nosebleeds33.Which of the following is not right when a boy's nose bleeds?A.Let his head not tilt back. B.Let his head tilt forward a little.C.Let him sit up. D.Pinch his nose for less than 10minutes.34.Which part of a magazine may the passage come from?A.Lifestyle.B.Health. C.Sports. D.Education.35.What's the main idea of the passage?A.First aid for some accidental wounds.B.Steps of looking for medical care.C.Advice on ways not to get hurt. D.Ways to ask for help in getting hurt.第二节(共 5 小题,每小题 2 分,满分 10 分)请根据的小标题,从下面的描述中找出与其相匹配的选项。