四川省成都市实验外国语学校八年级上学期期末考试题

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成都市实验外国语学校初中英语八年级上册 Unit 7经典习题(含答案)

成都市实验外国语学校初中英语八年级上册 Unit 7经典习题(含答案)

一、选择题1.The students in our school learn English _________computers .A.at B.in C.on D.to C解析:C【解析】【详解】句意:我们学校的学生在计算机上学习英语。

at在,in在……里,on在……上面,to向。

on computers在电脑上,故选C。

2.I __ __ think there __ __ more pollution.A./, won’t be B.don’t, will be C./, won’t have B解析:B【详解】句意:我认为将不会有更多的污染。

don’t不;won’t be不会有;will be将会有;won’t have将会有。

根据句子结构可知,这句话中think后跟了宾语从句,从句中是否定的意思时,应将否定形式前移到主句中,故第一个空用否定的形式,第二个空用肯定的形式。

且从句中使用的是there be句型的将来时态there will be“将会有”,故应选B。

3.I’m going to be a doctor __ __ five years.A.after B.during C.in C解析:C【详解】句意:五年后我想要成为一名医生。

after在…...之后;during在...…期间;in在...…里面;在一段时间之后。

句中be going to表示将来,in在将来时态中,后面跟一段时间,可以表示“在...…之后”,故应选C。

4.— __ __ will the bus come?— It will come in ten minutes.A.How many B.How much C.How soon C解析:C【详解】句意:-公交车多久能来?-它将在十分钟之后来。

How many多少,提问数量,修饰可数名词;How much多少,提问数量,修饰不可数名词;多少钱,提问价格;How soon多久,多快,常与一般将来时态搭配使用,答语中用in后跟一段时间。

四川省成都市嘉祥外国语学校锦江校区2020-2021学年八年级上学期期末英语试题

四川省成都市嘉祥外国语学校锦江校区2020-2021学年八年级上学期期末英语试题

四川省成都市嘉祥外国语学校锦江校区2020-2021学年八年级上学期期末英语试题学校:___________姓名:___________班级:___________考号:___________一、单项选择1.— Mom, to make the dish, I need ________ onion. Could you pass one to me?— Sure, but remember to cook it for half an hour.A.an B.the C.a2.If you don’t know ________ next, you can ask your parents or teachers for help. A.how to do B.what to do C.where to go3.My best friend Jack can’t stop ________ at me when knowing my silly mistake in the math test.A.laugh B.laughing C.to laugh4.—What do you think of the English dictionary?—Not bad. You can’t find ________ in the bookstore.A.a good one B.a better one C.the best one 5.—The air pollution in Chengdu is getting worse and worse in winter.—It will be even worse ________ we pay more attention to producing less waste.A.if B.until C.unless6.Dad, I’m studying for my final exam. Could you please ________ the radio a little? A.turn off B.turn down C.turn up7.— If it ________ this Sunday, let’s go to the countryside.— OK! But nobody knows if it will rain in three days.A.won’t rain B.rains C.doesn’t rain8.On the eve of Spring Festival, we have nothing special to do but ________ the Spring Festival Gala.A.watch B.to watch C.watching 9.—Mom, must I prepare for the New Year’s party right now?—No, you ________. But you have to get everything ready before all the guests arrive. A.needn’t B.can’t C.mustn’t10.—What do you think of the movie, Sheep Without a Shepherd?—________. I feel very excited when watching it in the cinema.A.I don’t mind it.B.I like it very much.C.I can’t stand it.二、补全对话5选5A: Gina, we are coming to the end of this term. ____11____.B: Me, neither. ____12____.A: I am going to take a trip to Shenzhen with my parents. The weather there is really good. I can’t stand the cold winter in Chengdu. How about you?B: Sounds great! ____13____. They have a big farm in the countryside.A: It’s great. ____14____.B: Not often. They are in Nanchong. It’s a little far from Chengdu. I just go back when I have a long vacation.A: I see. Let’s go to the movies together this weekend.B: ____15____. I have to study for the tests. I want to get good grades in the final exam.A: Good luck to you!A.What’s your vacation plan?B.I want to visit my grandparents.C.Do you often go back to visit them?D.I can’t wait to enjoy the coming vacation.E.I’d love to, but I’m afraid I won’t have time.三、完形填空Dear Linda,I’m really happy to hear that you’re interested in foods that are ____16____ eaten during holidays in China. I’m writing to you now to introduce some of the most well-known foods in my hometown.During the Lantern Festival, people typically eat sweet dumplings ____17____ round shape and sweet stuffing. They think they are a symbol of a happy year. ____18____ similar kind of food is served during the Dragon Boat Festival. It is called zongzi, and eaten in a green wrapping made from a spring plant. These traditional foods are made from special ingredients and to symbolize ____19____ for well-being and happiness.My favorite is noodles served in sweet sauce. The noodles have a fresh ____20____. For people in Beijing, there is no better choice of food to eat on a warm summer day.I hope this information can be of some help to you.Yours,Chen Hui 16.A.sometimes B.hardly C.traditionally 17.A.for B.with C.of18.A.Other B.Another C.The other 19.A.wish B.luck C.plan20.A.look B.color C.tasteA rich man had a son with bad habits. On day, he took his son to an old scholar (学者) to ask for ____21____.The scholar took the boy for a walk ____22____ a garden. Stopping suddenly he asked the boy to ____23____ out a small plant growing there, The boy held the plant between his thumb (拇指) and forefinger and pulled it out. The old man then asked him to pull out a little ____24____ plant. The boy pulled hard and the plant came out, roots and all.“Now pull out that one,” said the old man, pointing to a bush (灌木丛). ____25____, the boy tried his best and pulled it out.“Now take this one out,” said the old man, pointing to an apple tree. The boy held the tree and tried to pull it out. ____26____ it would not move. “It’s ____27____ to pull it out,” said the boy.“So it is with bad habits,” said the scholar. “When ____28____ are young, it is easy to pull them out. But when they grow bigger, they cannot be pulled out easily.”The lesson with the old man changed the boy’s life. He gave up his bad ____29____ and became an excellent man.Don’t ____30____ for bad habits to grow in you, drop them while you have control over them, or they will get control over you.21.A.question B.class C.help 22.A.through B.across C.on23.A.put B.cut C.pull24.A.older B.bigger C.smaller25.A.At first B.At the beginning of C.At last26.A.So B.But C.Or27.A.easy B.possible C.impossible 28.A.we B.you C.they 29.A.mistakes B.habits C.hobbies 30.A.hope B.wait C.leave四、阅读判断根据内容判断句子的正误。

2021-2022学年四川省成都外国语学校八年级(上)期中数学试卷

2021-2022学年四川省成都外国语学校八年级(上)期中数学试卷

2021-2022学年四川省成都外国语学校八年级(上)期中数学试卷一、选择题(本大题共10小题,每小题3分,共30分)1.(3分)下列各数中,无理数的个数为()3.14,,π,,0.1010010001…(相邻两个1之间0的个数逐次加1)A.1个B.2个C.3个D.4个2.(3分)下列各组数据分别是线段a,b,c的长,能组成直角三角形的是()A.7,2,9B.4,5,6C.3,4,5D.5,10,13 3.(3分)下列关于的说法中,错误的是()A.是无理数B.C.D.5的平方根是4.(3分)下列各式是最简二次根式的是()A.B.C.D.5.(3分)如果点P(﹣2,﹣3)和点Q(a,3)关于x轴对称,则a的值是()A.﹣2B.3C.﹣3D.26.(3分)变量x与y之间的关系是y=2x+3,当自变量x=6时,因变量y的值是()A.1.5B.3C.4.5D.157.(3分)下列说法错误的是()A.一个正数有两个平方根B.一个负数的立方根是负数C.0的算术平方根是0D.平方根等于本身的数是0,18.(3分)下列各曲线中表示y是x的函数的是()A.B.C.D.9.(3分)我国古代数学著作《九章算术》中有这样一个问题:“今有方池一丈,葭(jiā)生其中央,出水一尺,引葭赴岸,适与岸齐.问水深几何?”(注:丈、尺是长度单位,1丈=10尺)意思为:如图,有一个边长为1丈的正方形水池,在水池正中央有一根芦苇,它高出水面1尺,如果把这根芦苇拉向水池一边的中点,它的顶端恰好碰到池边的水面.则水池里水的深度是()A.5尺B.10尺C.12尺D.13尺10.(3分)如图,将正方形OABC放在平面直角坐标系中,O是原点,点A的坐标为(1,),则点C的坐标为()A.(﹣1,﹣)B.(,﹣1)C.(﹣1,)D.(﹣,1)二、填空题(每小题4分,共16分)11.(4分)16的算术平方根是;﹣27的立方根是.12.(4分)在平面直角坐标系中,点P(﹣3,x2+2)在第象限.13.(4分)如图1,数轴上点A所表示的数为1,点B,C,D是4×4的正方形网格上的格点,以点A为圆心,AD长为半径画圆交数轴于P,Q两点,则P点所表示的数为.(可以用含根号的式子表示)14.(4分)如图,用每张长6cm的纸片,重叠1cm粘贴成一条纸带,纸带的长度y(cm)与纸片的张数x之间的关系式是.三、解答题(本大题共6个小题,共54分)15.(12分)计算:(1);(2);(3);(4).16.(8分)设一个三角形的三边分别为a,b,c,p=(a+b+c),则有下列面积公式:S =(海伦公式);S=(秦九韶公式).(1)一个三角形的三边长依次为3,5,6,任选以上一个公式求这个三角形的面积;(2)一个三角形的三边长依次为,,,任选以上一个公式求这个三角形的面积.17.(8分)在如图所示的正方形网格中,每个小正方形的边长都为1,△ABC的顶点都在格点上(网格线的交点).(1)请在如图所示的网格平面内建立适当的平面直角坐标系,使点A坐标为(﹣1,2),点B的坐标为(﹣5,2);(画出直角坐标系)(2)点C的坐标为(,)(直接写出结果)(3)把△ABC先向下平移6个单位后得到对应的△A1B1C1,再将△A1B1C1沿y轴翻折至△A2B2C2;①请在坐标系中画出△A2B2C2;②若点P(m,n)是△ABC边上任意一点,P2是△A2B2C2边上与P对应的点,写出点P2的坐标为(,);(直接写出结果)③试在y轴上找一点Q,使得点Q到A2,C2两点的距离之和最小,此时,QA2+QC2的长度之和最小值为.(在图中画出点Q的位置,并直接写出最小值答案)18.(8分)某电信公司手机的A类收费标准如下:不管通话时间多长,每部手机每月必须交月租费12元,另外,通话费按0.2元/min计.(1)写出每月应缴费用y(元)与通话时间x(min)之间的关系式;(2)某手机用户这个月通话时间为120min,他应缴费多少元?19.(8分)如图,小明家A和地铁口B两地恰好处在东西方向上,且相距3km,学校C在他家正北方向的4km处,公园D与地铁口和学校的距离分别5km和5km.(1)求地铁口、公园和学校三地组成的∠BDC的大小;(2)计算公园与小明家的距离.20.(10分)在Rt△ABC中,∠ACB=90°,AC=BC,∠CAB=∠CBA=45°,D为BC 上一点,连接AD,过点C作CE⊥AD于点E.(1)如图1,过点B作BF⊥BC交CE的延长线于点F,求证:△ACD≌△CBF;(2)如图2,若D为BC的中点,CE的延长线交AB于点M,连接DM.求证:∠BDM =∠ADC.一、填空题(每小题4分,共20分)21.(4分)如图,所有的四边形都是正方形,所有的三角形都是直角三角形,其中最大的正方形的边长为3cm,则图中所有正方形的面积之和为cm2.22.(4分)在直线y=﹣2x+5上到x轴的距离等于3的点的坐标是.23.(4分)已知b为正数,a为b的小数部分,且a2+b2=27,求a+b的值是.24.(4分)如图,点A1在直线l1:y=x上,过点A1作x轴的平行线交直线l2:y=x于点B1,过点B1作l2的垂线交l1于点A2,过点A2作x轴的平行线交直线l2于点B2,过点B2作l2的垂线交l1于点A3,过点A3作x轴的平行线交直线l2于点B3,…,过点B1,B2,B3,…,分别作l1的平行线交A2B2于点C1,交A3B3于点C2,交A4B4于点C3,…,按此规律继续下去,若OA1=1,则点C2021的坐标.25.(4分)如图,在平面直角坐标系xOy中,A(1,0),B(3,0),点P为y轴正半轴上的一个动点,以线段P A为边在P A的右上方作等边△APQ,连接QB,在点P运动的过程中,线段QB长度的最小值为.二、解答题(本大题共3小题,共30分)26.(8分)将一块a×b×c的长方体铁块(如图1所示,单位:cm)放入一长方体水槽(如图2所示)中,并以速度v(单位:cm3/s)匀速向水槽注水,直至注满为止.已知铁块中棱长b为10cm,水槽的底面积为200cm2.若将铁块b×c面放至水槽的底面,则注水全过程中水槽的水深y(cm)与注水时间t(s)的函数图象如图3所示(水槽各面的厚度忽略不计).(1)铁块中棱长a=cm,水槽的深度为cm.(2)求注水速度v及铁块中棱长c的值.27.(10分)如图,△ABC是等腰直角三角形,∠ACB=90°,AC=BC=3,D在线段BC上,E是线段AD上一点.现以CE为直角边,C为直角顶点,在CE的下方作等腰直角△ECF,连接BF.(1)如图1,求证:∠CAE=∠CBF;(2)当A、E、F三点共线时,如图2,若BF=2,求AF的长;(3)如图3,若∠BAD=15°,连接DF,当E运动到使得∠ACE=30°时,求△DEF 的面积.28.(12分)在平面直角坐标系中,点A、B分别在x轴、y轴上,OA=3,∠BAO=60°.(1)如图1,将△ABO绕点O逆时针旋转得到△CDO,点A、B的对应点分别是点C、D,当点C刚好落在线段AB上时,求点D的坐标.(2)将△COD继续逆时针旋转至图2位置,使点C、D分别落在第二、三象限,连接BC、AD,求证:S△BCO=S△AOD.( 3 )将△COD继续逆时针旋转至图3位置,使点C、D分别落在第三、四象限,且∠AOD=30°,试在y轴上找一点P,使△COP的面积与△AOD的面积相等,请直接写出点P的坐标以及△COP中CP边上的高的长度.。

2020-2021学年四川省成都外国语学校八年级(上)期中数学试卷(解析版)

2020-2021学年四川省成都外国语学校八年级(上)期中数学试卷(解析版)

2020-2021学年四川省成都外国语学校八年级第一学期期中数学试卷一、选择题(共10小题,每小题3分,共30分)1.下列各数中的无理数是()A.B.3.14C.D.π2.下列三条长度的线段不能组成直角三角形的是()A.,,B.12,5,13C.7,24,25D.9,40,41 3.函数y=中,自变量x的取值范围是()A.x>3B.x≤3C.x≠3D.x<34.下列说法中,正确的是()A.任意数的算术平方根都是正数B.只有正数才有算术平方根C.因为3的平方根是9,所以9的平方根是3D.﹣1是1的平方根5.下列计算正确的是()A.﹣=B.2×3=12C.=3D.4+3=14 6.若点P(m,2)与点Q(3,n)关于原点对称,则m,n的值分别为()A.﹣3,2B.3,﹣2C.﹣3,﹣2D.3,27.在平面直角坐标系中,有两点坐标分别为(2,0)和(0,3),则这两点之间的距离是()A.B.C.13D.58.对于一次函数y=﹣2x+4,下列结论错误的是()A.函数的图象不经过第三象限B.函数的图象与x轴的交点坐标是(2,0)C.函数的图象向下平移4个单位长度得y=﹣2x的图象D.若两点A(1,y1),B(3,y2)在该函数图象上,则y1<y29.如图,小巷左右两侧是竖直的墙,一架梯子斜靠在左墙时,梯子底端到左墙角的距离为0.7米,顶端距离地面2.4米,如果保持梯子底端位置不动,将梯子斜靠在右墙时,顶端距离地面2米,则小巷的宽度为()A.2.2米B.2.3米C.2.4米D.2.5米10.如图,在△ABC和△ADE中,∠BAC=∠DAE=90°,AB=AC,AD=AE,点C,D,E在同一条直角形上,连接B、D和B,E,下列四个结论:①BD=CE;②BD⊥CE;③∠ACE+∠DBC=30°④BE2=2(AD2+AB2)其中,正确的个数是()A.1B.2C.3D.4二、填空题(本大题共4小题,每小题4分,共16分)11.比较大小:6.12.已知直角三角形的两条直角边长分别为6cm和8cm,则这个直角三角形的外接圆的半径为cm.13.已知a、b分别是的整数部分和小数部分,那么2a﹣b的值为.14.已知A、B、C在数轴上的位置如图,AB=AC,A、B两点对应的实数分别是1和﹣,则点C对应的实数是.三、解答题(本大题共6小题,共54分)15.计算.(1).(2)(2﹣3)2﹣(4+3)(4﹣3).16.若实数y的立方根是2,且实数x、y、z满足+y+(x﹣z+4)2=8,(1)求x+y﹣2z的值;(2)若x、y、z是△ABC的三边长,试判断△ABC的形状.17.如图,△ABC在正方形网格中,若A(0,3),按要求回答下列问题(1)在图中建立正确的平面直角坐标系;(2)根据所建立的坐标系,写出B和C的坐标;(3)计算△ABC的面积.18.为了普及“新冠病毒”的防疫知识,某市镇政府采用了移动宣讲的形式进行宣传动员.如图,笔直公路MN的一侧点A处有一村庄,村庄A到公路MN的距离为800米,假使宣讲车P周围1000米以内能听到广播宣传,宣讲车P在公路MN上沿PN方向行驶时:(1)请问村庄能否听到宣传,并说明理由.(2)如果能听到,已知宣讲车的速度是每分钟300米,那么村庄总共能听到多长时间的宣传?19.如图,在边长为6的正方形ABCD中,E是边CD的中点,将△ADE沿AE对折至△AFE,延长EF交边BC于点G,连接AG.(1)求证:△ABG≌△AFG;(2)求BG的长.20.如图(1),在平面直角坐标系中,AB⊥x轴于B,AC⊥y轴于C,点C(0,4),A(4,4),过C点作∠ECF分别交线段AB、OB于E、F两点(1)若OF+BE=AB,求证:CF=CE.(2)如图(2),且∠ECF=45°,S△ECF=6,求S△BEF的值.四、填空题(本大题共5小题,每小题4分,共20分)21.已知y=+8x,则的算术平方根为.22.在平面直角坐标系中,点A(1,2a+3)到x轴的距离与到y轴的距离相等,则a =.23.如图,在平面直角坐标系中,将△ABO绕点A顺时针旋转到△AB1C1的位置,点B、O 分别落在点B1、C1处,点B1在x轴上,再将△AB1C1绕点B1顺时针旋转到△A1B1C2的位置,点C2在x轴上,将△A1B1C2绕点C2顺时针旋转到△A2B2C2的位置,点A2在x轴上,依次进行下去….若点A(,0),B(0,2),则点B2016的坐标为.24.如图,直线AB的解析式为y=﹣x+b分别与x,y轴交于A,B两点,点A的坐标为(3,0),过点B的直线交x轴负半轴于点C,且OB:OC=3:1.在x轴上方存在点D,使以点A,B,D为顶点的三角形与△ABC全等,则点D的坐标为.25.定理:直角三角形斜边上的中线等于斜边的一半,即:如图1,在Rt△ABC中,∠ACB =90°,若点D是斜边AB的中点,则CD=AB,运用:如图2,△ABC中,∠BAC=90°,AB=2,AC=3,点D是BC的中点,将△ABD沿AD翻折得到△AED连接BE,CE,DE,则CE的长为.五、解答题(本大题共3小题,共30分)26.解决如下问题:(1)分母有理化:.(2)计算:.(3)若a=,求2a2﹣8a+1的值.27.如图1,在△ABC中,AD⊥BC于D,CE⊥AB于E,AD与CE交于点F,∠ACE=45°.(1)求证:△AEF≌△CEB.(2)若G在BC的延长线上,连接GA,若GA=GB,求证:AC平分∠DAG.(3)如图2,在(2)的条件下,H为AG的中点,连接DH交AC于M,连接EM、ED,若S△EMC=4,∠BAD=15°,求AM的长.28.如图1,等腰直角△ABC中,∠ACB=90°,CB=CA,直线DE经过点C,过A作AD ⊥DE于点D,过B作BE⊥DE于点E,则△BEC≌△CDA,我们称这种全等模型为“K 型全等”.(不需要证明)[模型应用]若一次函数y=kx+4(h≠0)的图象与x轴、y轴分别交于A、B两点.(1)如图2,当k=﹣1时,若B到经过原点的直线l的距离BE的长为3,求A到直线l的距离AD的长.(2)如图3,当k=﹣时,点M在第一象限内,若△ABM是等腰直角三角形,求点M 的坐标.(3)当k的取值变化时,点A随之在x轴上运动,将线段BA绕点B逆时针旋转90°得到BQ,当Q在第一象限落在直线y=0.5x+1上时,在x轴上求一点H,使HQ+HB的值最小,请求出H的坐标.参考答案一、选择题(本大题共10小题,每小题3分,共30分)1.下列各数中的无理数是()A.B.3.14C.D.π【分析】根据无限不循环小数叫无理数,可得答案.解:A.,是整数,属于有理数;B.3.14是有限小数,属于有理数;C.是分数,属于有理数;D.π是无理数.故选:D.2.下列三条长度的线段不能组成直角三角形的是()A.,,B.12,5,13C.7,24,25D.9,40,41【分析】只要验证两小边的平方和等于最长边的平方即可判断是直角三角形.解:A、()2+()2≠()2,故选项A中的三条线段不能构成直角三角形;B、52+122=132,故选项B中的三条线段能构成直角三角形;C、72+242=252,故选项C中的三条线段能构成直角三角形;D、92+402=412,故选项D中的三条线段能构成直角三角形;故选:A.3.函数y=中,自变量x的取值范围是()A.x>3B.x≤3C.x≠3D.x<3【分析】根据二次根式的被开方数是非负数、分母不为0列出不等式,解不等式得到答案.解:由题意得:3﹣x>0,解得:x<3,故选:D.4.下列说法中,正确的是()A.任意数的算术平方根都是正数B.只有正数才有算术平方根C.因为3的平方根是9,所以9的平方根是3D.﹣1是1的平方根【分析】根据算术平方根以及平方根的定义对各选项分析判断后利用排除法.解:A、正数的算术平方根是正数,0的算术平方根是0,故A选项错误;B、0也有算术平方根,是0,故B选项错误;C、应为3是9的平方根,所以9的平方根是±3,故C选项错误;D、﹣1是1的平方根,故D选项正确.故选:D.5.下列计算正确的是()A.﹣=B.2×3=12C.=3D.4+3=14【分析】根据各个选项中的式子,可以计算出正确的结果,从而可以解答本题.解:∵不能合并,故选项A错误;∵=12,故选项B正确;∵=,故选项C错误;∵4+3=7,故选项D错误;故选:B.6.若点P(m,2)与点Q(3,n)关于原点对称,则m,n的值分别为()A.﹣3,2B.3,﹣2C.﹣3,﹣2D.3,2【分析】根据关于原点对称的点的横坐标互为相反数,纵坐标互为相反数,可得答案.解:点P(m,2)与点Q(3,n)关于原点对称,得m=﹣3,n=﹣2,故选:C.7.在平面直角坐标系中,有两点坐标分别为(2,0)和(0,3),则这两点之间的距离是()A.B.C.13D.5【分析】先根据A、B两点的坐标求出OA及OB的长,再根据勾股定理即可得出结论.解:∵A(2,0)和B(0,3),∴OA=2,OB=3,∴AB=.故选:A.8.对于一次函数y=﹣2x+4,下列结论错误的是()A.函数的图象不经过第三象限B.函数的图象与x轴的交点坐标是(2,0)C.函数的图象向下平移4个单位长度得y=﹣2x的图象D.若两点A(1,y1),B(3,y2)在该函数图象上,则y1<y2【分析】根据一次函数的性质,以及函数图象与坐标轴的交点的求法即可判断.解:A、函数经过一、二、四象限,不经过第三象限,故A选项正确.B、当y=0时,x=2,则函数图象与x轴交点坐标是(2,0),故B选项正确;C、函数的图象向下平移4个单位长度得y=﹣2x+4﹣4=﹣2x,故C选项正确;D、一次项系数小于0,则函数值随自变量的增大而减小,∵1<3,∴y1>y2,故D选项错误;故选:D.9.如图,小巷左右两侧是竖直的墙,一架梯子斜靠在左墙时,梯子底端到左墙角的距离为0.7米,顶端距离地面2.4米,如果保持梯子底端位置不动,将梯子斜靠在右墙时,顶端距离地面2米,则小巷的宽度为()A.2.2米B.2.3米C.2.4米D.2.5米【分析】先根据勾股定理求出AB的长,同理可得出BD的长,进而可得出结论.解:在Rt△ACB中,∵∠ACB=90°,BC=0.7米,AC=2.4米,∴AB2=0.72+2.42=6.25.在Rt△A′BD中,∵∠A′DB=90°,A′D=2米,BD2+A′D2=A′B2,∴BD2+22=6.25,∴BD2=2.25,∵BD>0,∴BD=1.5米,∴CD=BC+BD=0.7+1.5=2.2米.故选:A.10.如图,在△ABC和△ADE中,∠BAC=∠DAE=90°,AB=AC,AD=AE,点C,D,E在同一条直角形上,连接B、D和B,E,下列四个结论:①BD=CE;②BD⊥CE;③∠ACE+∠DBC=30°④BE2=2(AD2+AB2)其中,正确的个数是()A.1B.2C.3D.4【分析】①由条件证明△ABD≌△ACE,就可以得到结论;②由△ABD≌△ACE就可以得出∠ABD=∠ACE,就可以得出∠BDC=90°而得出结论;③由条件知∠ABC=∠ABD+∠DBC=45°,由∠DBC+∠ACE=90°,就可以得出结论;④△BDE为直角三角形就可以得出BE2=BD2+DE2,由△DAE和△BAC是等腰直角三角形就有DE2=2AD2,BC2=2AB2,就有BC2=BD2+CD2≠BD2就可以得出结论.解:①∵∠BAC=∠DAE,∴∠BAC+∠DAC=∠DAE+∠DAC,即∠BAD=∠CAE.在△ABD和△ACE中,∵,∴△ABD≌△ACE(SAS),∴BD=CE.故①正确;∵△ABD≌△ACE,∴∠ABD=∠ACE.∵∠CAB=90°,∴∠ABD+∠DBC+∠ACB=90°,∴∠DBC+∠ACE+∠ACB=90°,∴∠BDC=180°﹣90°=90°.∴BD⊥CE;故②正确;③∵∠BAC=90°,AB=AC,∴∠ABC=45°,∴∠ABD+∠DBC=45°.∴∠ACE+∠DBC=45°,故③错误;④∵BD⊥CE,∴BE2=BD2+DE2.∵∠BAC=∠DAE=90°,AB=AC,AD=AE,∴DE2=2AD2,BC2=2AB2.∵BC2=BD2+CD2≠BD2,∴2AB2=BD2+CD2≠BD2,∴BE2≠2(AD2+AB2).故④错误,故选:B.二、填空题(本大题共4小题,每小题4分,共16分)11.比较大小:<6.【分析】先运用二次根式的性质把根号外的移到根号内,然后只需根据条件分析被开方数即可.解:∵6=,∴<,即<6.故答案为:<.12.已知直角三角形的两条直角边长分别为6cm和8cm,则这个直角三角形的外接圆的半径为5cm.【分析】首先根据勾股定理,得斜边是10cm,再根据其外接圆的半径是斜边的一半,得出其外接圆的半径.解:∵直角边长分别为6cm和8cm,∴斜边是10cm,∴这个直角三角形的外接圆的半径为5cm.13.已知a、b分别是的整数部分和小数部分,那么2a﹣b的值为.【分析】先估算的取值范围,进而可求6﹣的取值范围,从而可求a,进而求b,最后把a、b的值代入计算即可.解:∵<<,∴3<<4,∴2<6﹣<3,∴a=2,∴b=6﹣﹣2=4﹣,∴2a﹣b=2×2﹣(4﹣)=.故答案是.14.已知A、B、C在数轴上的位置如图,AB=AC,A、B两点对应的实数分别是1和﹣,则点C对应的实数是2+.【分析】设出点C所表示的数为x,根据点B、C到点A的距离相等列出方程,即可求出x的值.解:设点C所表示的数为x,∵点B与点C到点A的距离相等,∴AC=AB,即x﹣1=1+,解得:x=2+.故答案为:2+.三、解答题(本大题共6小题,共54分)15.计算.(1).(2)(2﹣3)2﹣(4+3)(4﹣3).【分析】(1)先去绝对值,再把二次根式化为最简二次根式,然后合并即可;(2)利用完全平分公式和平方差公式计算.解:(1)原式=2﹣+2﹣=2;(2)原式=20﹣12+27﹣(16﹣18)=47﹣12+2=49﹣12.16.若实数y的立方根是2,且实数x、y、z满足+y+(x﹣z+4)2=8,(1)求x+y﹣2z的值;(2)若x、y、z是△ABC的三边长,试判断△ABC的形状.【分析】(1)根据非负性进行解答;(2)根据勾股定理的逆定理解答即可.解:(1)∵实数y的立方根是2,∴y=8∵+y+(x﹣z+4)2=8,∴x=6,z=10∴x+y﹣2z=6+8﹣20=﹣6(2)∵x2+y2=36+64=100,z2=100∴x2+y2=z2.∴△ABC是直角三角形.17.如图,△ABC在正方形网格中,若A(0,3),按要求回答下列问题(1)在图中建立正确的平面直角坐标系;(2)根据所建立的坐标系,写出B和C的坐标;(3)计算△ABC的面积.【分析】(1)根据点A的坐标为(0,4),进而得出原点的位置,进而建立正确的平面直角坐标系;(2)根据坐标系直接得出点B和点C的坐标;(3)△ABC的面积等于长为4,宽为4的正方形的面积减去直角边长为4,2的直角三角形的面积,减去直角边长为3,4的直角三角形面积,减去直角边长为1,2的直角三角形的面积.解:(1)如图所示:建立平面直角坐标系;(2)根据坐标系可得出:B(﹣3,﹣1)C(1,1);(3)S△ABC=4×4﹣4×2﹣×3×4﹣×1×2=5.18.为了普及“新冠病毒”的防疫知识,某市镇政府采用了移动宣讲的形式进行宣传动员.如图,笔直公路MN的一侧点A处有一村庄,村庄A到公路MN的距离为800米,假使宣讲车P周围1000米以内能听到广播宣传,宣讲车P在公路MN上沿PN方向行驶时:(1)请问村庄能否听到宣传,并说明理由.(2)如果能听到,已知宣讲车的速度是每分钟300米,那么村庄总共能听到多长时间的宣传?【分析】(1)根据村庄A到公路MN的距离为800米<1000米,于是得到结论;(2)根据勾股定理得到BP=BQ==600米,求得PQ=1200米,于是得到结论.解:(1)村庄能听到宣传,理由:∵村庄A到公路MN的距离为800米<1000米,∴村庄能听到宣传;(2)如图:假设当宣讲车行驶到P点开始影响村庄,行驶QD点结束对村庄的影响,则AP=AQ=1000米,AB=800米,∴BP=BQ==600米,∴PQ=1200米,∴影响村庄的时间为:1200÷300=4分钟,∴村庄总共能听到4分钟的宣传.19.如图,在边长为6的正方形ABCD中,E是边CD的中点,将△ADE沿AE对折至△AFE,延长EF交边BC于点G,连接AG.(1)求证:△ABG≌△AFG;(2)求BG的长.【分析】(1)利用翻折变换对应边关系得出AB=AF,∠B=∠AFG=90°,利用HL定理得出△ABG≌△AFG即可;(2)利用勾股定理得出GE2=CG2+CE2,进而求出BG即可;解:(1)在正方形ABCD中,AD=AB=BC=CD,∠D=∠B=∠BCD=90°,∵将△ADE沿AE对折至△AFE,∴AD=AF,DE=EF,∠D=∠AFE=90°,∴AB=AF,∠B=∠AFG=90°,又∵AG=AG,在Rt△ABG和Rt△AFG中,,∴△ABG≌△AFG(HL);(2)∵△ABG≌△AFG,∴BG=FG,设BG=FG=x,则GC=6﹣x,∵E为CD的中点,∴CE=EF=DE=3,∴EG=3+x,∴在Rt△CEG中,32+(6﹣x)2=(3+x)2,解得x=2,∴BG=2.20.如图(1),在平面直角坐标系中,AB⊥x轴于B,AC⊥y轴于C,点C(0,4),A(4,4),过C点作∠ECF分别交线段AB、OB于E、F两点(1)若OF+BE=AB,求证:CF=CE.(2)如图(2),且∠ECF=45°,S△ECF=6,求S△BEF的值.【分析】(1)以SAS判定△COF≌△CAE,即可得结论;(2)将△ACE绕点C顺时针旋转90°,再证明△GCF≌△ECF(SAS),从而S△BEF=S﹣S△ECF﹣S△ECA﹣S△OCF,将相关三角形和正方形的面积代入即可求得答案四边形OBAC解:(1)证明:∵AB⊥x轴,AC⊥y轴∴∠ABO=∠ACO=90°∵∠BOC=90°∴∠A=360°﹣∠ABO﹣∠ACO﹣∠BOC=90°∴∠A=∠BOC∵C(0,4),A(4,4)∴OC=AC=AB=4∵OF+BE=AB,AB=AE+BE∴OF=AE在△COF和△CAE中∴△COF≌△CAE(SAS)∴CF=CE.(2)将△ACE绕点C顺时针旋转90°,则FG=AE+OF,CG=CE,∠ACE=∠GCO∵∠ECF=45°,∴∠ACE+∠FCO=∠ACO﹣∠ECF=90°﹣45°=45°∴∠GCF=∠GCO+∠FCO=∠ACE+∠FCO=45°∴∠GCF=∠ECF在△GCF和△ECF中∴△GCF≌△ECF(SAS)∵S△ECF=6∴S△GCF=6∴S△ECA+S△OCF=6∵由(1)知四边形OBAC为边长为4的正方形∴S四边形OBAC=4×4=16∴S△BEF=S四边形OBAC﹣S△ECF﹣S△ECA﹣S△OCF=16﹣6﹣6=4∴S△BEF的值为4.四、填空题(本大题共5小题,每小题4分,共20分)21.已知y=+8x,则的算术平方根为2.【分析】根据被开方数大于等于0列式求出x的值,再求出y的值,然后代入代数式求出的值,再根据算术平方根的定义解答.解:由题意得,2x﹣1≥0且1﹣2x≥0,解得x≥且x≤,∴x=,∴y=+8x=0+0+8×=4,∴==4,∴的算术平方根是2.故答案为:2.22.在平面直角坐标系中,点A(1,2a+3)到x轴的距离与到y轴的距离相等,则a=﹣1或﹣2.【分析】根据点A到x轴的距离与到y轴的距离相等可得2a+3=1或2a+3=﹣1,据此解出a的值.解:∵A到x轴的距离与到y轴的距离相等,∴2a+3=1或2a+3=﹣1,解得a=﹣1或a=﹣2.故答案为:﹣1或﹣2.23.如图,在平面直角坐标系中,将△ABO绕点A顺时针旋转到△AB1C1的位置,点B、O 分别落在点B1、C1处,点B1在x轴上,再将△AB1C1绕点B1顺时针旋转到△A1B1C2的位置,点C2在x轴上,将△A1B1C2绕点C2顺时针旋转到△A2B2C2的位置,点A2在x轴上,依次进行下去….若点A(,0),B(0,2),则点B2016的坐标为(6048,2).【分析】首先根据已知求出三角形三边长度,然后通过旋转发现,B、B2、B4…,即可得每偶数之间的B相差6个单位长度,根据这个规律可以求得B2016的坐标.解:∵AO=,BO=2,∴AB==,∴OA+AB1+B1C2=6,∴B2的横坐标为:6,且B2C2=2,∴B4的横坐标为:2×6=12,∴点B2016的横坐标为:2016÷2×6=6048.∴点B2016的纵坐标为:2.∴点B2016的坐标为:(6048,2).故答案为:(6048,2).24.如图,直线AB的解析式为y=﹣x+b分别与x,y轴交于A,B两点,点A的坐标为(3,0),过点B的直线交x轴负半轴于点C,且OB:OC=3:1.在x轴上方存在点D,使以点A,B,D为顶点的三角形与△ABC全等,则点D的坐标为(4,3)或(3,4).【分析】求出B(0,3)、点C(﹣1,0),分当BD平行x轴、BD不平行x轴两种情况,分别求解即可.解:将点A的坐标代入函数表达式得:0=﹣3+b,解得:b=3,故直线AB的表达式为:y=﹣x+3,则点B(0,3),OB:OC=3:1,则OC=1,即点C(﹣1,0);①如图,当BD平行x轴时,点A,B,D为顶点的三角形与△ABC全等,则四边形BDAC为平行四边形,则BD=AC=1+3=4,则点D(4,3),②当BD不平行x轴时,则S△ABD=S△ABD′,则点D、D′到AB的距离相等,则直线DD′∥AB,设:直线DD′的表达式为:y=﹣x+n,将点D的坐标代入上式并解得:n=7,直线DD′的表达式为:y=﹣x+7,设点D′(n,7﹣n),A,B,D为顶点的三角形与△ABC全等,则BD′=BC==,解得:n=3,故点D′(3,4);故答案为:(4,3)或(3,4).25.定理:直角三角形斜边上的中线等于斜边的一半,即:如图1,在Rt△ABC中,∠ACB =90°,若点D是斜边AB的中点,则CD=AB,运用:如图2,△ABC中,∠BAC=90°,AB=2,AC=3,点D是BC的中点,将△ABD沿AD翻折得到△AED连接BE,CE,DE,则CE的长为.【分析】根据•BC•AH=•AB•AC,可得AH=,根据垂直平分线的性质可得AD•BO=BD•AH,得OB=,再根据BE=2OB=,运用勾股定理可得EC===.解:如图,连接BE交AD于O,作AH⊥BC于H.在Rt△ABC中,∠BAC=90°,AB=2,AC=3,由勾股定理得BC=,由题可得AD=DC=DB=,∵•BC•AH=•AB•AC,∴×=∴AH=,∵AE=AB,DE=DB,∴点A在BE的垂直平分线上,点D在BE的垂直平分线上,∴AD垂直平分线段BE,∵AD•BO=BD•AH,∴OB=,∴BE=2OB=,在Rt△BCE中,EC===.故答案为.五、解答题(本大题共3小题,共30分)26.解决如下问题:(1)分母有理化:.(2)计算:.(3)若a=,求2a2﹣8a+1的值.【分析】(1)根据分母有理化计算;(2)根据(1)中结论计算即可;(3)根据分母有理化把a化简,根据完全平方公式把原式变形,把a的值代入计算即可.解:(1)==﹣1;(2)原式=﹣1+﹣+﹣+…+﹣=﹣1=45﹣1=44;(3)a===+2,则2a2﹣8a+1=2(a2﹣4a+4)﹣7=2(a﹣2)2﹣7=2(+2﹣2)2﹣7=10﹣7=3.27.如图1,在△ABC中,AD⊥BC于D,CE⊥AB于E,AD与CE交于点F,∠ACE=45°.(1)求证:△AEF≌△CEB.(2)若G在BC的延长线上,连接GA,若GA=GB,求证:AC平分∠DAG.(3)如图2,在(2)的条件下,H为AG的中点,连接DH交AC于M,连接EM、ED,若S△EMC=4,∠BAD=15°,求AM的长.【分析】(1)先判断出AE=CE,再利用等角的余角相等判断出∠EAF=∠ECB,进而判断出△AEF≌△CEB,即可得出结论;(2)先利用三角形外角的性质得出∠AEF=45°+∠CAD,进而得出∠B=45°+∠CAD,而∠B=∠BAG,得出∠BAG=45°+∠CAD,而∠BAG=45°+∠CAG,即可得出结论;(3)先判断出△ADH是等边三角形,进而利用含30度角的直角三角形的性质判断出AM =3CM,进而求出△ACM的面积,即可求出AE,进而求出AC,即可得出结论.【解答】(1)证明:∵CE⊥AB,∴∠AEC=∠BEC=90°,∵∠ACE=45°,∴∠CAE=45°=∠ACE,∴AE=CE,∵AD⊥BC,∴∠ADC=90°,∴∠ECB+∠CFD=90°,∵∠CFD=∠AFE,∴∠ECB+∠AFE=90°,∵∠EAF+∠AFE=90°,∴∠EAF=∠ECB,在△AEF和△CEB中,,∴△AEF≌△CEB(ASA);(2)证明;∵△AEF≌△CEB,∴∠AFE=∠B,∵∠AFE=∠ACE+∠CAD=45°+∠CAD,∴∠B=45°+∠CAD,∵AG=BG,∴∠B=∠BAG,∴∠BAG=45°+∠CAD,∵∠BAG=∠CAE+∠CAG=45°+∠CAG,∴∠CAD=∠CAG,∴AC平分∠DAG;(3)解:∵∠BAD=15°,∠CAE=45°,∴∠CAD=∠CAE﹣∠BAD=30°,∵∠CAD=∠CAG,∴∠DAG=2∠CAD=60°,在Rt△ADG中,点H是AG的中点,∴DH=AH,∴△ADH是等边三角形,∴∠ADH=60°,AD=AH,∵∠CAD=∠CAG,∴AC⊥DH,即:∠AMD=∠DMC=90°∵∠ADC=90°,∴∠CDM=30°,在Rt△DMC中,DM=CM,在Rt△AMD中,AM=DM=×CM=3CM,∴S△AEM=3S△CEM=3×4=12,∴S△ACE=S△CEM+S△AEM=16,∵∠AEC=90°,AE=CE,∴S△ACE=AE2=16,∴AE=4,∴AC=AE=8,∴AM+CM=8,∵AM=3CM,∴3CM+CM=8,∴CM=2,∴AM=3CM=6.28.如图1,等腰直角△ABC中,∠ACB=90°,CB=CA,直线DE经过点C,过A作AD ⊥DE于点D,过B作BE⊥DE于点E,则△BEC≌△CDA,我们称这种全等模型为“K 型全等”.(不需要证明)[模型应用]若一次函数y=kx+4(h≠0)的图象与x轴、y轴分别交于A、B两点.(1)如图2,当k=﹣1时,若B到经过原点的直线l的距离BE的长为3,求A到直线l的距离AD的长.(2)如图3,当k=﹣时,点M在第一象限内,若△ABM是等腰直角三角形,求点M 的坐标.(3)当k的取值变化时,点A随之在x轴上运动,将线段BA绕点B逆时针旋转90°得到BQ,当Q在第一象限落在直线y=0.5x+1上时,在x轴上求一点H,使HQ+HB的值最小,请求出H的坐标.【分析】(1)由题意可知△BEO≌△AOD(K型全等),OE=AD,B(0,4),OE=,AD=;(2)k=﹣时,A(3,0),分三种情况讨论,①当BM⊥AB,且BM=AB时,过点M 作MN⊥y轴,由“AAS”可证△BMN≌△ABO,所以MN=OB,BN=OA;②当AB⊥AM,且AM=AB时,过点M作x轴垂线MK,可知△ABO≌△AMK(AAS),所以OB=AK,OA=MK;③当AM⊥BM,且AM=BM时,过点M作MH⊥x轴,MG⊥y轴,由“AAS”可证△BMG ≌△AHM,所以BG=AH,GM=MH,GM=MH,则有4﹣MH=MH﹣3;(3)由“AAS”可证△MAB≌△NBQ,可得BN=AM=4,NQ=MB=|﹣|=||,可求点Q坐标,作点Q关于x轴的对称点Q'(4,﹣3),连接BQ',交x轴于H,此时HB+HQ 最小,求出BQ'的解析式,联立方程组,可求解.解:(1)由题意可知:△BEO≌△AOD(K型全等),∴OE=AD,∵k=﹣1,∴y=﹣x+4,∴B(0,4),∴OB=4,∵BE=3,∴OE=,∴AD=;(2)k=﹣时,y=﹣x+4,∴A(3,0),①当BM⊥AB,且BM=AB时,如图3﹣1,过点M作MN⊥y轴,∴∠MNB=∠AOB=∠ABM=90°,∵∠ABO+∠MBN=90°=∠ABO+∠BAO,∴∠BAO=∠MBN,又∵AB=BM,∴△BMN≌△ABO(AAS),∴MN=OB,BN=OA,∴MN=4,BN=3,∴M(4,7);②如图3﹣2,当AB⊥AM,且AM=AB时,过点M作x轴垂线MK,同理可证:△ABO≌△AMK(AAS),∴OB=AK,OA=MK,∴AK=4,MK=3,∴M(7,3);③当AM⊥BM,且AM=BM时,如图3﹣3,过点M作MH⊥x轴,MG⊥y轴,同理可证:△BMG≌△AHM(AAS),∴BG=AH,GM=MH,∴GM=MH,∴4﹣MH=MH﹣3,∴MH=,∴M(,);综上所述:M(7,3)或M(4,7)或M(,);(3)设AB的解析式为y=kx+4,∴点A(﹣,0),点B(0,4),如图4,过点B作MN∥AO,过点A作AM⊥MN于M,过点Q作QN⊥MN于N,∵将线段BA绕点B逆时针旋转90°得到BQ,∴AB=BQ,∠ABQ=90°,∴∠ABM+∠MAB=90°,∠MBA+∠NBQ=90°,∴∠MAB=∠NBQ,在△MAB与△NBQ中,,∴△MAB≌△NBQ(AAS),∴BN=AM=4,NQ=MB=|﹣|=||,∴点Q(4,||),∴||=0.5×4+1,∴点Q(4,3),作点Q关于x轴的对称点Q'(4,﹣3),连接BQ',交x轴于H,此时HB+HQ最小,设直线BQ'解析式为y=mx+n,由题意可得:,解得:,∴直线BQ'解析式为y=﹣x+4,当y=0时,﹣x+4=0,∴x=,∴点H坐标为(,0).。

2023-2024学年四川省成都实验外国语学校八年级上学期期中英语试卷

2023-2024学年四川省成都实验外国语学校八年级上学期期中英语试卷

2023-2024学年四川省成都实验外国语学校八年级上学期期中英语试卷1. Hearing such ________ exciting news, Sally can’t help jumping up and down in excitement!A.a B.an C./2. —How is Helen in the new school?—She is doing well. There is ________ to worry about.A.something B.everything C.nothing3. —________ do you have a sports meeting?—Every year there’s a sports meeting in our school.A.How long B.How often C.How many4. Just be ________. You can’t make such great progress in a day. It takes time.A.comfortable B.meaningful C.patient5. —I think Anna sang ________ than Julie.—You’re right, but Julie danced ________ than Anna.A.more clearly; better B.more loudly; beautifully C.the most clearly; better 6. At first, I found the story very ________, but when I read on, I became ________.A.boring; more interested B.interesting; less bored C.excited; more boring 7. — Why do you ________ wear this pair of shoes?—Because they’re the most comfortable of all my s hoes.A.always B.hardly ever C.sometimes8. —Have you ever been to Beijing?—Of course. Actually, I ________ there for six years but now I live in Zhenjiang.A.worked B.work C.am working9. —I ________ with my family last weekend. We all had a great time.—That’s nice. Doing outdoor sports makes us healthy.A.took some photos B.rode bicycles C.went to the cinema 10. —Shall we go to the movies or stay at home?—Either is OK. ________.A.Come on B.It’s up to you C.No problemPeople with pets at home often think they know a lot about their pets. _______, that is not the fact.A new study finds that dogs are nervous when they hear _______. And many pet owners don’t even notice this.“Ginny was a very _______ dog. But one day she began to act very strangely. She looked nervous, and even _______ eating for days,” says Emma Grigg. “Later, I found it was because of the noises from a smoke detector (烟雾报警器) in another part of the house. When the sound stopped, Ginny became _______ soon.”Scientists found that high-frequency (频率) noises like the noises from a smoke detector can make dogs nervous more easily than low-frequency noises like the noises from a vacuum.11.A.So B.And C.However12.A.music B.noises C.sounds13.A.friendly B.strong C.noisy14.A.kept B.stopped C.liked15.A.normal B.happy C.excitedReaders is a popular TV show in China. It invites different people to _______ aloud on the stage. The show also _______ the moving stories behind those people. They can read everything, like poems, books, and _______ .By reading aloud, the words on the paper come to life. Many people are fans of the _______. They begin to enjoy reading aloud at home. Now, the show gives people a _______ place to read across China. It is a reading pavilion (朗读亭). It _______ in cities including Shanghai, Hangzhou and Xi’an.Let’s have a look! The pavilion is not very _______ . Only one person can come into it each time. There is a microphone (麦克风) in it and it records people’s _______ . Everyone can read for three minutes in it. You can read _______ you like. The show will pick some of the ________ and invite them to read on TV.People of all ages read in the pavilion. “Reading should be just like singing and talking,” said Dong Qing, the host and producer of the show. “We can express our true feelings by reading aloud.”16.A.sing B.read C.speak17.A.tells B.talks C.introduces18.A.movies B.letters C.games19.A.film B.song C.show20.A.sad B.special C.usual21.A.brought out B.went past C.showed up22.A.big B.small C.interesting23.A.voices B.faces C.smiles24.A.anything B.something C.everything25.A.singers B.readers C.speakersRead the passage and judge the statements true or false. If it’s true, please choose “A”; if it’s false, please choose “B”.Every year, in late March or early April, a boat race takes place on the Thames River, England. This boat race is an event between the two most famous and also the oldest universities in Britain—the Oxford and the Cambridge.The idea for the boat race between the universities came from two friends—Charles Merivale, a student at Cambridge, and his friend Charles Wordsworth who was at Oxford. They decided to setup a boat race between the two universities. On March 12, 1829, Cambridge sent a challenge to Oxford first.When the first boat race took place in a small town by Thames, eight students from each university became the competitors. Crowds of twenty thousand traveled to watch. It was so exciting. And the Oxford was clear winners. Later on, not only did the students from the two universities take part, but also some social groups attended the event. By 1845, with the small town becoming too crowded, the boat race had moved six miles up to the village-Putney. From 1856 on, the race has been held every year except war years. This boat race is considered to be “the world’s oldest sporting challenge”.The race is four and a quarter miles in just 20 minutes and the competitors often face difficulties. It usually takes six months for the two teams to prepare for the big days. In the past, the Oxford was mostly the winners. But things have changed from 1993 on. The Cambridge has won more.26. The boat race takes place between the Oxford and the Cambridge.27. On March 12, 1829, Oxford sent a challenge to Cambridge first.28. There were twenty students competing in the first boat race.29. From 1856 on, the boat race has been held every year with no stop.30. It usually takes six months for the two teams to prepare for the boat race.Reading comprehensionMany people don’t think that TV shows are educational. It is true that lots of shows are meaningless. However, some shows are good and we can learn many things from them. Here are a few of my favorite shows.The Great British Bake OffFrozen Planet31. The writer watched Blue Peter ________ when he was a child.A.three times a week B.twice a week C.three times a month 32. ________ might be most interested in the show The Great British Bake Off.A.Someone who is interested in British cultureB.Someone who is trying to save animalsC.Someone who is interested in cooking33. If Sarah likes animals, she can watch ________.A.Blue Peter B.The Great British BakeOfC.Frozen Planet34. According to the passage, we can know ________.A.Pointless is a knowledge quiz only about sportsB.Blue Peter tells about different countries around the worldC.the writer always watches The Great British Bake Off online35. The passage is mainly written for ________.A.children B.teachers C.TV loversThe weather is getting hotter. You are thirsty after playing basketball or riding home from school. A cold drink maybe just the thing. But be careful about what you are drinking. Something that looks cool may not be good for your health.There are plenty of “energy drinks” on the market. Most of them have beautiful colors and cool names. The lists on them tell you they are helpful to your health. Sounds great! But after a careful check, you may find that most energy drinks have lots of caffeine (咖啡因) in them. These drinks are especially aimed at young people, students, busy people and sports players. Makers sometimes say their drinks make you better at sports and can keep you awake. But be careful not to drink too much.Caffeine makes your heartbeat fast. Because of this, the International Olympic Committee has limited its use. Caffeine in most energy drinks is at least as strong as that in a cup of coffee or tea.Possible health dangers have something to do with energy drinks. Just one box of energy drink can make you nervous, have difficulty sleeping and can even cause heart problems. Scientists say that teenagers should be stopped from taking drinks with a lot of caffeine in them.So we should stay away from the energy drinks to keep healthy.36. Many people like drinking energy drinks because ________.①they have beautiful colors and cool names②they have lots of caffeine③they can keep them awake and better at sports④they are said to be helpful to healthA.①③④B.①②③C.②③④37. The underlined word “limited” means ________.A.disliked B.helped C.stopped38. From the passage we can know that ________.A.energy drinks are helpful to teenagers’ studyB.energy drinks are especially aimed at teenagersC.sports players need to drink a lot of energy drinks39. What is the structure of the passage?A.B.C.40. Which of the following can be the best title of the passage?A.Energy Drinks—Sportsmen’s best choiceB.Energy Drinks—Good for HealthC.Energy Drinks—Be careful41. This is t________ English weather—one minute it’s raining and the next minute the sun is shining.42. People in Beijing don’t like this famous and expensive dish, but it is especially popular ins________ China.43. No one can dance as b________ as she does. The audiences are all amazed by her movement, thinking she may be a real butterfly.44. After his volunteer work in the hospital, he c________ to be a doctor and his mum felt very proud of him.45. My red balloon,Flies up, up, to the sky.I jumped up high,To r________ the sky.Fill in the blanks according to the texts we’ve learnt.We want to know how the students think of their friends. So we interviewed two students. Here are their opinions. According to Huang Lei, he thinks it’s not n 46 to be the same as his friends. He takes his friend Larry as an example. Although Larry is quite d 47 from him, he is still his best friend. He thinks Larry often b 48 out the best in him. Since Larry is l 49 hard-working, Huang Lei thinks he should help him get better g 50 . Mary Smith doesn’t c 51 if her friends are the same or different. Her best friend Carol is not only kind but also the f 52 person she ever knew. She remembered that she broke her leg but Carol made her l 53 . One of Mary’s favourite s 54 is that, “ A true friend reaches for your hand and t 55 your heart.” So she thinks Carol is a true friend to her, no matter how different they are.A: Hi, Mary. I hear that you are in a new school this term(学期). I 56 how your school life is this term. Can you tell me about it?B: Well, I have to say that this term is quite 57 for me. We’re busy with all the subjects on weekdays, you know. I can 58 spend any time relaxing myself.A: Oh, it seems that you’re having a hard time.B: Not really. Although I’m busy every day, I still feel quite happy in the new school. During the past two months, my classmates 59 me in many ways. Because of them, I even made great progress in English. And you know that I wasn’t very 60 before, but now I quite enjoy talking with people, even strangers.A: Wow! I’m so happy for you. How do you spend your weekends then?B: At the weekend, my family usually have some outdoor 61 , like hiking, cycling or rock climbing. We like getting close to nature to enjoy the blue sky and fresh air. Last week my family went 62 in the west of Sichuan. Although it was a bit cold to sleep in the tent at night, we had fun watching the stars.A: You’re really lucky! Last time we went there, the weather was terrible. The next morning, it started to rain. On the way home, we saw landfalls(山体滑坡)in many places. Actually, we were a bit 63 at that time. It was really dangerous to drive through the mountains in summer.B: Yeah. I still remember the landfall in a small village in Maoxian last year. More than 100 people lost their lives in that 64 . No one could expect such a thing to happen in that beautiful place.A: Yeah, so if we want to go somewhere to have fun, we must 65 a safe place carefully.Choose 10 from the 12 words in the box to complete the passage with their proper forms.Each word can be used only oncebeginning big complete decision hobby I ill notice one stop volunteer wonderWhen I signed up (报名) 66 at a hospital last year, I didn’t have any expectations (期望). I 67 to do it mainly because my friends were doing it.On my 68 day, I was given a tour of the hospital. I was then told to stand next to an information sign and answer every question that came my way.On the third day, I 69 a wheelchair speeding (加速) in my direction. A young boy of about six with one of the 70 smiles that I had ever seen was sitting in it. The boy 71 in front of me and said, “Who are you? You’re in my hospital and I don’t even know you!” This boy’s smile 72 made me relaxed. I introduced 73 and explained that I was new. Then, he 74 to tell me about his medical history, his favourite football player and other things about his life. From our talk, I knew he was there for his weekly check-up. He wasn’t afraid of being in hospital because he believed the doctor would cure his legs at last. Our talk changed my view of young children, 75 and hospitals.It was this experience that made me decide to be a volunteer there, and also led me to study medicine at university. Volunteering might not do the same thing for everyone, but it was a life-changer for me.Reading Choose five of the sentences from the box and put them back to complete the passage.Your body needs many things to stay healthy. 76 And there are many kinds of exercise. You probably get exercise without even thinking about it. You might go for a walk or a run. Or you might dance. Dancing is a great way to exercise with your family. 77 And you might swim, climb mountains or play tennis. You might ride a bike or go skating. All of these activities are good for your body.Exercise helps your body keep working in the right ways. It makes your heart and other muscles (肌肉) grow stronger. 78 This helps you stay at a healthy weight. Exercise even helps your brain get more oxygen (氧气), so you can think better. If you exercise each day, it can help you feel yourself best.79 The experts say children should exercise for 60 minutes each day. You don’t have to do it all at one time, however. You can do push-ups in the morning, play hide-and-seek at breaks, and then ride your bike with your friends after school. It all adds up! 80完成图表。

四川省成都市2020-2021学年八年级上学期期末考试英语试题分类汇编:补全短文(部分答案)

四川省成都市2020-2021学年八年级上学期期末考试英语试题分类汇编:补全短文(部分答案)

四川省成都市2020-2021学年八年级上学期期末考试英语试题分类汇编补全短文成都市金牛区八年级2020-2021学年上学期期末英语试卷四、阅读表达。

(共10小题;计10分)A.补全短文。

根据短文内容,从短文后的A~F选项中选出适当的选项补全短文。

(共5小题,每小题1分;计5分)Art can show humans' creative mind. But these years, you may read news about AI(人工智能)creating its own art, such as painting or writing articles. 1 But this worry seems to be unnecessary, at least for now. AI is bringing artists more possibilities, not taking the place of artists. 2These days, a piece of music created by AI became hot online. AI turns the novel coronavirus (新冠病毒)into a piece of two-hour long music on its protein structure(蛋白质结构). An American musician and expert of engineering matched each note with amino acid (氨基酸).___3___ . Listeners found this music made them see the virus from a new point of view.4 AI truly helps artists create things that they ever thought impossible before._____ 5 For example, AI now can help to color in black-and-white lines in making cartoons so that it could help artists save much time.We hope that AI can become a useful helper to make a difference to the art world if it's welcomed and trusted.1-5 DBAEC四川省成都市龙泉驿区2020-2021学年八年级上学期期末考试英语试题A. 补全短文根据短文内容,从短文后的A~F中选出5个适当的选项补全短文,答题卡上只需填涂选项的编号字母。

四川省成都市2020-2021学年八年级上学期期末考试英语试题分类汇编:补全图表(部分答案)

四川省成都市2020-2021学年八年级上学期期末考试英语试题分类汇编补全图表成都市金牛区八年级2020-2021学年上学期期末英语试卷B.完成图表。

阅读下面短文,根据其内容,完成图表中所缺的信息。

(共5小题,每小题1分;计5分)The COVID-19 makes people stay at home. Though some peoplecan improve their cooking skills, others are missing delicious food thatthey often have in restaurants. No other food can appear more often thanhotpot on Chinese dinner table. Because hotpot can show how muchChinese like to get together to enjoy happiness.As one of the famous meals in China, hotpot is being popular for ages, because of its special ways to cook. From vegetables to meat, from noodles to seafood, eaters can add any ingredients they like to the hotpot. Unlike other cooking ways,boiling(煮沸)food can make their nutrients (营养)get into the soup. This way can maximize(最大利用)all the ingredients.Hotpot can bring warmth to our body in winter, and help cool the body in summer.But eating hotpot is much more than an enjoyment for our taste or health. People usually celebrate life and friendship by eating hotpot. For most Chinese people, eating hotpot is usually an important social(社会的)event. A survey showed that 54.6% of Chinese usually eat hotpot with friends,and 42% choose hotpot for a family get-together. When a group of people sit around a table to eat, talk and drink, it's a good time. "As the food keeps boiling in the soup, we keep drinking and talking with each other. This makes the time warm," said Yu Jiaqing, a 28-year-old saleswoman from Beijing.As a popular saying goes, "There's nothing to worry about after having a hotpot. If you are still worried,then go for it twice." So if you feel empty or lonely(孤独),why not cook a hotpot to fill your stomach(胃)and make your heart comfortable as well?1. 2. 3. 4. 5.答案:1. most common/popular2. different kinds of3. keep warm; keep cool/ cool the body4. celebration5. comfort四川省成都市龙泉驿区2020-2021学年八年级上学期期末考试英语试题B. 完成表格。

2022-2023学年四川省成都实验外国语学校八年级(上)期中数学试卷

2022-2023学年四川省成都实验外国语学校八年级(上)期中数学试卷一、选择题(本大题共8个小题,每小题4分,共32分,每小题只有一项符合题目要求)1.(4分)在0,﹣,π,这四个数中,是无理数的是()A.πB.C.0D.2.(4分)下列各点中,在第四象限的点是()A.(5,3)B.(5,﹣3)C.(﹣5,﹣3)D.(﹣5,3)3.(4分)已知三条线段的长度分别为如下数据,那么以这三条线段为边不能构成直角三角形的是()A.1,1,B.,,C.6,8,10D.5,12,134.(4分)下列运算正确的是()A.B.C.D.5.(4分)下列二次根式中,最简二次根式是()A.B.C.D.6.(4分)估算的运算结果应在哪两个整数之间()A.3和4B.4和5C.5和6D.6和77.(4分)将点P(m+2,3)向右平移3个单位长度到P′,且P′在y轴上,那么m的值是()A.﹣3B.1C.﹣1D.﹣58.(4分)如图,△ABC中,AB=AC=10,BC=12,D是BC的中点,DE⊥AB于点E,则DE的长为()A.B.8C.D.二、填空题(本大题共5小题,每小题4分,共20分)9.(4分)16的算术平方根是;﹣27的立方根是.10.(4分)平面内点A(﹣1,4)到y轴的距离是.11.(4分)若在实数范围内有意义,则x的取值范围是.12.(4分)已知x+4的平方根是±3,3x+y﹣1的立方根是3,求y2﹣x2的算术平方根为.13.(4分)如图,把直角△ABC沿AD折叠后,使点B落在AC边上点E处,若AB=6,AC=10,则S△DEC=.三、解答题(本大题共6个小题,共48分)14.(18分)(1)计算:﹣;(2)计算:;(3)计算:(﹣1)(+1)﹣()﹣2﹣(π﹣2)0;(4)计算:﹣6﹣2x;(5)解方程:(2x﹣1)3﹣27=0;(6)解方程:﹣4=0.15.(6分)已知:x=+1,y=﹣1,求下列代数式的值:(1)x2﹣y2(2)x2﹣3xy+y2.16.(6分)如图,△ABC三个顶点的坐标分别为A(1,1),B(4,2),C(3,4).(1)画出△ABC关于x轴对称的△A1B1C1;(2)请求出三角形ABC的面积.17.(8分)如图,在离水面高度为8米的岸上,有人用绳子拉船靠岸,开始时绳子BC的长为17米,几分钟后船到达点D的位置,此时绳子CD的长为10米,问船向岸边移动了多少米.18.(10分)已知A(a,0),B(b,0),C(0,c).且满足|a+1|+=0,(c﹣2)2≤0,平面内有一点D(m,2)(其中m是常数),请回答下列问题:(1)求A、B、C三点的坐标;(2)若点D在第二象限,连接BC,请用含m的代数式表示四边形ADCB的面积S四边形ADCB,并求出当S四边形ADCB=4S△ABC时,m的值;(3)若点D是由点C沿x轴正方向平移AB距离得到的,连接CD、BD,请问在四边形ACDB边上是否存在点P使得△APC为等腰三角形,若存在,直接写出点P的坐标,若不存在,请说明理由.一、填空题(本大题共5小题,每小题4分,共20分),19.(4分)若a=+1,则a2﹣2a+10的值为.20.(4分)已知a+b=﹣4,ab=2,则=.21.(4分)如图,已知一块四边形草地ABCD,其中∠A=45°,∠B=∠D=90°,AB=10m,CD=5m,则这块土地的面积为.22.(4分)如图,在Rt△ABC中,∠B=90°,AB=3,BC=4,现将线段CA绕点B逆时针旋转得到A′C′,若A′C′恰好与BC平行,与AB交于点D,则点C′到AB的距离为;若点A恰好在A′C′上,则点C′到AB的距离为.23.(4分)在平面直角坐标系xOy中,经过点M(0,m)且平行于x轴的直线可以记作直线y=m,平行于y轴的直线可以记作直线x=m,我们给出如下的定义:点P(x,y)先关于x轴对称得到点P1,再将点P1关于直线y=m对称得点P′,则称点P′为点P关于x轴和直线y=m的二次反射点.已知点P(2,3),Q(2,2)关于x轴和直线y=m的二次反射点分别为P1,Q1,点M(2,3)关于直线x=m对称的点为M1,则当三角形P1Q1M1的面积为1时,则m=.二、解答题(本大题共3个小题,共30分)24.(8分)细心观察如图,认真分析各式,然后解答下列问题:OA22=()2+1=2,S1=(S1是Rt△OA1A2的面积);OA32=()2+1=3,S2=(S2是Rt△OA2A3的面积);OA42=()2+1=4,S3=(S3是Rt△OA3A4的面积);……(1)请用含有n(n为正整数)的式子填空:OA n2=,S n=;(2)求+++?+的值.25.(10分)在矩形ABCD中,AB=4,BC=3,点E是射线AB上一个动点,连接DE并延长交射线CB于点F,将△ADE沿直线DE翻折到△A′DE,延长DA′与直线BC交于点M.(1)求证:DM=MF;(2)当点E是边AB的中点时,求CM的长;(3)当BF=2时,直接写出BM的长.26.(12分)如图1,在平面直角坐标系中,点A的坐标为(0,8),点B在第一象限,△OAB为等边三角形.(1)直接写出点B的纵坐标;(2)如图2,OC⊥AB于点C,点C关于x轴的对称点为点D,则点D的纵坐标为;连接AD交OB于E,则OE的长为.(3)若点P为x轴上的一个动点,连接P A,以P A为边作等边△P AQ,当OQ最短时,求Q点的纵坐标.(请先在答题纸的备用图中画出示意图,再进行求解)。

2020-2021学年四川省成都实验外国语学校西区八年级(上)入学数学试卷

2020-2021学年四川省成都实验外国语学校西区八年级(上)入学数学试卷一、选抨题(每小题3分、共30分)1.(3分)下列计算正确的是()A.a2+a3=a5B.a6÷a3=a2C.5x﹣3x=2D.(﹣2a2b)3=﹣8a6b32.(3分)2015年4月,生物学家发现一种病毒的长度约为0.0000043米,利用科学记数法表示为()A.4.3×106米B.4.3×10﹣5米C.4.3×10﹣6米D.43×107米3.(3分)随着生活水平的不断提高,汽车越来越普及,在下面的汽车标志图中,不属于轴对称的图形是()A.B.C.D.4.(3分)计算结果为a2﹣5a﹣6的是()A.(a﹣6)(a+1)B.(a﹣2)(a+3)C.(a+6)(a﹣1)D.(a+2)(a﹣3)5.(3分)已知三角形的三边长分别为4,5,x,则x不可能是()A.3B.5C.7D.96.(3分)如图,在下列条件中,能判断AB∥CD的是()A.∠DAC=∠ACB B.∠DCB+∠ADC=180°C.∠ABD=∠BDC D.∠BAC=∠ADC7.(3分)下列算式不能用平方差公式计算的是()A.(2x+y)(2y﹣x)B.(3x﹣y)(3x+y)C.(x+1)(﹣x+1)D.(x﹣y)(y+x)8.(3分)如图,已知∠BAC=∠DAC,那么添加下列一个条件后,仍无法判定△ABC≌△ADC的是()A.CB=CD B.AB=AD C.∠BCA=∠DCA D.∠B=∠D9.(3分)某学习小组做“用频率估计概率的试验时,统计了某一结果出现的频率,绘制了如图所示折线统计图,则符合这一结果的试验最有可能的是()A.掷一枚正六面体的骰子,出现1点朝上B.任意写一个整数,它能被2整除C.不透明袋中装有大小和质地都相同的1个红球和2个黄球,从中随机取一个,取到红球D.先后两次掷一枚质地均匀的硬币,两次都出现反面10.(3分)如图,AD是△ABC的角平分线,DF⊥AB,垂足为F,DE=DM,△ADM和△AED的面积分别为58和40,则△EDF的面积为()A.11B.10C.9D.8二、填空题(本大题共4个小题,每小题4分,共16分)11.(4分)已知5a=2,5b=3,则52a+b=.12.(4分)若(2a﹣1)2=4a2+ma+1,则m的值是.13.(4分)如图,以△ABC的顶点A为圆心,以BC长为半径作弧,再以顶点C为圆心,以AB长为半径作弧,两弧交于点D;连接AD、CD,若∠B=56°,则∠ADC的大小为度.14.(4分)如图,射线OA、BA分别表示甲、乙两人骑自行车运动过程的一次函数的图象,图中s、t分别表示行驶距离和时间,则这两人骑自行车的速度相差km/h.三、解答题(共54分)15.(15分)化简或计算(1)|﹣2|+(﹣)﹣1﹣(π﹣3)0+(﹣1)2020;(2)(﹣2xy2)3•3x2y÷(xy)5;(3)2ab+2a(3a﹣b)﹣(a﹣b)(a+b).16.(7分)先化简,再求值:(2x+1)(2x﹣1)﹣(x+2)2,其中x=﹣.四、解答题17.(6分)如图,方格子的边长为1,△ABC的顶点在格点上.(1)画出△ABC关于直线l对称的△A1B1C1;(2)求△ABC的面积.18.(8分)如图,在△ABC中,CA=CB,D为边AB的中点,E,F分别为边CA,CB上的一点,且∠CED =∠CFD.(1)△AED与△BFD全等吗?请说明理由.(2)当∠C=110°,BD=BF时,求∠EDF的度数.19.(8分)“六一”儿童节小明上班开展娱乐活动,在不透明的盒子中装有除颜色外完全相同的小球若干个,其中红球2个,绿球3个,黑球5个.(1)混合均匀后从盒子中随机摸出一个小球,恰好摸到红色小球的概率为多少?(2)若小明又放入若干个黑球(除颜色外与盒中其他小球完全相同),与原来的小球均匀混合在一起,使从盒中随机摸出一个黑色小球的概率是,求后来小明又放入多少个黑色小球?20.(10分)已知:在四边形ABCD中,AC,BD相交于点E,且点E是AC的中点,AC⊥BD,过点B作BF⊥CD,垂足为点F,BF与AC交于点G.(1)如图1,求证:∠BGE=∠ADE;(2)如图2,若∠ABC=90°;①求证:DE=EG;②若AC=8,△BCG的面积为4,求四边形ABCD的面积.一、填空题(本大题共5个小题,每小题4分,共20分)B卷(共50分)21.(4分)若关于x的二次三项式9x2+2(a﹣4)x+16是一个完全平方式,则a的值为.22.(4分)若多项式x2+2mx﹣1与x2﹣2x+n的乘积中不含x2和x3项,则m2﹣mn+n2=.23.(4分)有7张正面分别标有数字1,0,﹣1,﹣2,﹣3,﹣4,﹣5的卡片,它们除数字不同外其余全部相同.现将它们背面朝上,洗匀后从中随机抽取一张,记卡片上的数字为m,则使(m+4)m+1=1成立的概率是.24.(4分)如图,∠ABC=30°,点D是∠ABC内的一点,且DB=9,若点E,F分别是射线BA,BC上异于点B的动点,则△DEF的周长的最小值是.25.(4分)如图,已知四边形ABCD中,AB=12厘米,BC=8厘米,CD=14厘米,∠B=∠C,点E为线段AB的中点.如果点P在线段BC上以3厘米/秒的速度由B点向C点运动,同时,点Q在线段CD上由C点向D点运动.当点Q的运动速度为厘米/秒时,能够使△BPE与以C、P、Q三点所构成的三角形全等.二.解答题(本大题共3个小题,共30分)26.(8分)对于一个图形,通过两种不同的方法计算它的面积,可以得到一个数学等式,例如图1可以得到(a+b)2=a2+2ab+b2,请解答下列问题:(1)图2所表示的数学等式为;(2)利用(1)得到的结论,解决问题:若a+b+c=12,a2+b2+c2=60,求ab+ac+bc的值;(3)如图3,将两个边长分别为a和b的正方形拼在一起,B,C,D三点在同一直线上,连接AE,EG,若两正方形的边长满足a+b=15,ab=35,求阴影部分面积.27.(10分)某公司开发出一款新的节能产品,成本价为6元/件,该产品在正式投放市场前通过代销点进行了为期一个月(30天)的试销售,销售价为8元/件,工作人员对销售情况进行了跟踪记录,并将记录情况绘制成如图的图象,图中的折线ODE表示日销售量y(件)与销售时间第x(天)之间的函数关系,已知线段DE表示的关系中,时间每增加1天,日销售量减少5件.(1)第20天的日销售量是件,日销售利润是元.(2)求y与x之间的函数关系式;(3)日销售利润不低于640元的天数共有多少天?28.(12分)已知,如图AD为△ABC的中线,分别以AB和AC为一边在△ABC的外部作等腰三角形ABE 和等腰三角形ACF,且AE=AB,AF=AC,连接EF,∠EAF+∠BAC=180°(1)如图1,若∠ABE=63°,∠BAC=45°,求∠F AC的度数;(2)如图1,请探究线段EF和线段AD有何数量关系?并证明你的结论;(3)如图2,设EF交AB于点G,交AC于点R,延长FC,EB交于点M,若点G为线段EF的中点,且∠BAE=70°,请探究∠ACB和∠CAF的数量关系,并证明你的结论.参考答案一、选抨题(每小题3分、共30分)1.D;2.C;3.D;4.A;5.D;6.C;7.A;8.A;9.C;10.C;二、填空题(本大题共4个小题,每小题4分,共16分)11.12;12.﹣4;13.56;14.;三、解答题(共54分)15.(1)﹣1;(2)﹣24y2;(3)5a2+b2.;16.;四、解答题17.;18.;19.;20.(1)证明过程请看解答;(2)①证明过程请看解答;②24.;一、填空题(本大题共5个小题,每小题4分,共20分)B卷(共50分)21.16或﹣8;22.;23.;24.9;25.3或;二.解答题(本大题共3个小题,共30分)26.(a+b+c)2=a2+b2+c2+2ab+2bc+2ac;27.350;700。

四川成都实验外国语学校初中英语八年级上册 Unit 10阶段测试(含解析)

一、选择题1.The little boy is too young to look after ________.A.himself B.he C.his D.she A解析:A【详解】句意:这个小男孩太小了,不能照顾自己。

A.himself 他自己,反身代词;B. he他,主格代词;C. his他的,形容词性的物主代词;D. she她,主格代词。

主语小男孩和后面的他自己是同一人,look after后接反身代词做宾语。

故选A。

2.--Why are you going to be a reporter when you grow up?--Because I enjoy ______people.A.talk with B.talk about C.talking with D.talking about C解析:C【解析】【详解】句意:——为什么你长大后想成为一名记者?——因为我喜欢与人交谈。

考查动词短语及动词的固定搭配。

enjoy doing sth.喜欢做某事,enjoy后跟动词的ing形式,所以排除A、B 选项;talk with sb.与某人交谈,talk about sth.谈论某事;根据后面的people可知此处应是与人交谈,所以排除D选项;故答案选C。

3.She'll be late unless she ________ up early.A.got B.gets C.to get D.getting B解析:B【解析】【详解】句意:除非她起床早,她会迟到。

A. got一般过去时态;B. gets一般现在时态;C. to get动词不定式;D. getting现在进行时。

unless引导的时间状语从句,遵循主句用一般将来时,从句用一般现在时态。

根据题意,故选B。

4.Problems and ________ are normal ________ life. Don't be upset.A.worries; in B.worried; inC.worrying; at D.worry; at A解析:A【详解】句意:在我们日常生活中问题和担心是正常的,不要沮丧。

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成都外国学校上初二期末考试英语笔试试卷注意事项:1. 全卷分A卷和B卷,A卷满分75分,B卷满75分;考试时间120分钟。

2. 答题前,考生务必先认真核对条形码上的姓名、学籍号和座位号,无误后将本人姓名、学籍号和座位号填写在答题卡相应位置。

3. 保持答题卡面清洁,不得折叠、污染、破损等。

A卷(共75分)一、Multiple choice.(30 ')1. They baby's parents are out. Now his sister is looking after him.A」ooki ng for him B.looki ng at himC.keep ing an eye on himD.tak ing care him2. Most old people walk in the park after supper for fun.A. SomeB.The majority ofC.MajorityD.The majority3. Three quarters of thee students in the class are girls.A. 75 percent of the studentsB.45 percent of the studentsC.65 perce nt of the stude ntsD.Most of the stude nts4. People can buy textilescomi ng from In dia.A. fabricsB.clothesC.towelsD.sheetsA. the centerB.the center ofC.center ofD.the center of the6. The classroom is _____ for 60 students _____ .A. enough big, to sit inB.big enough,to sit inB. enough big, to sit D.big enough,to sit7. --Can you come to our Christmas Party this year?--Of course I can.It is _____ Sunday.A. /B.anC.theD.a8. -- ___________________________ ?--She is quite thin and she is got long blond hair.A. What does your sister look?B.How does your sister look like?B. What does your sister look like? D.How is your sister?9. The famous actor and his wife ______ for many years ___ three children.A. are married,withB.are married,haveC. married,withD.are married with,have10. The successful writer goes to India and helps the poor people three __ .A. In the twentiesB.in his twentiesC. in his twentiethD.in the twentieth11. There are about 14 __ people in Chengdu. ____ of them are suffering because of the smog.A. millions, Millionlion,Millionlion,Millionslions,Millions12. It usually takes me ____ to get to the business center form my home.A.one and a half hourB.one and half hoursC.one hour and a halfD.one hour and half13. When I was a college student,I always sat ______ the classroom so that I could listen to theteacher more clearly.A.in front ofB.in the front ofC.at the frontD.at the back of14. Johnson bought a new house for his __ daughter.A. eight years oldB.eight-year oldC.eight year oldD.eight-year-old15. My partner is interested _____ c ooking at home because she is bored ______ the food in therestaurant.A.in...aboutB.about...inC.with...inD.in...with16. __ will your son go back to the dance club?A.How oftenB.How longC.HowD.How soon17. The first meeting room can _________ one hundred people and second meeting room iseven _________A.have,much more largerB.hold,more largerC.hold,largerD.have,much larger18. After ______ t hat morning,he finds the small dog is _____ .A.having the breakfast,lostB.having breakfast,missedC.having a breakfast,lostD.having breakfast,missing19. --Jenny, ____ f ive people enough for the work?--Oh,I ' m afraid I need __ two.--OK,I ' ll find two for you.A. Is;anotherB.Are;anotherC.Is;otherD.Are;the other20. --My sister has got a new baby!It is a lovely girl!--Congratulations!You ' ve got a ____ now.A. cousinB.nephewC.nieceD.sister-in-law21. The evening classes are ___ .Do you finish ___ your all your homework today?A. finish...to doB.finished...doingC.finishing..to doD.finished..to do22. I am so hungry now. But I can ' t buy anything because the food shop___now andIt always ______ at 8:00 in the morning.A. is close;openB.is closed;is openC.is closed;opensD.is shut;open23. --Would you like___more coffee?--Yes,please.There isn ' t ___ in the cup.24. Mr.Green will call his wife as soon as he ___ London.A. arrives inB.arrivesC.getsD.get to25. It is more and more difficult ______ many parents ___ know and understand theirchildren.26. If you don' t tell me ____ you want,how can I know the things___you need andGet then for you?29. --The train will leave at twenty to four.--You mean ___ ?--Yes,please do'nt be late.30 The artist and writer,wearing tight jeans, ___ with the journalists happily.A. are talkingB.is talkC.is talkingD.talk二. Cloze.(15 ')AOne day, a father and his little son were heading___31___.At that age,the boy was interested__32___all kinds of things and was always asking questions.This time he asked: "Dad,what does the word 'runk '喝醉的)mean?" Well,my son, "his father___33___,”look,two policemen are standing in front of the bank.If I think the two policemen - ___ 34___four policemen,then that means I am probably drunk. "A.any;much B.some;a lot C.some;a lot of D.any;a lot ofA. of,toB.for,/C.of,/D.for,toA. that;thatB.that;what27. ____ exports are coming tomorrow and _A. The number of;the number ofB.The number of;a number of28. You can buy fruit and vegetables at ___ .A. the baker' sB.the butcher ' sC. what;thatD.what;what therooms we need is 10.C.A number of; a number ofD.A number of;the number ofC.the newsagentD.the greengrocer' sA.4:02B.3:40C.4:20D.3:20But,Dad, ”the boy said,”there is ONE policeman!It was at noon.It was shining brightly. Patrick finished his ___ 36___in the supermarket. Hewalked slowly into the car park behind the shopping center to __37__ his bags in the back of his car. As he moved to his car he saw two teenagers,dresses__38___red jackets and wearingRed baseball hats,struggling with the lock of a white Nissan car.Patrick__39__them for a few minutes before speaking. ”You two seem to be having trouble, ”he said.“Oh,it is all right, ”replied__40___loudly, ”the key sometimes gets stuck in the lock. ” “Perhaps you would like to try __41___key. ”suggested Patrick helpfully.“Why on earth would we want to do that? ”said the other youth in a sarcastic ( 讽刺的,挖苦的 ) voice.“ ___ 42 __ it is my car, ”Patrick answered.What happened next. They__43___and Patrick telephoned the police.Ten minutes __44__ the boys were caught in the local club.They were __ 45 ___ wearing their brightly coloured jackets and hats. 36. A. school B.homework C.study D.shopping 37.A. takeB.putC.bringD,send38. A. on B.in C.with D.for 39. A. met B.saw C.watched D.found 40. A. one girl B.one boy C.one man D.one woman 41. A. hisB.yourC.myD.her31. A .to home 32. A .about 33. A .asked34. A .looks like35. A .onlyB. at homeB. in B. shoutedB. likeB. stillC. in home C. withC. answer edC. is likeC. aboutBD. home D.onD. told D.look likeD. perha ps42. A. Because B.Though C.When D.If43. A. took away B.ra n away C.gave away D.got away44. te ter C.after D.before45. A. still B.eve n C.be D.thenReading Comprehension. (30 '46.The film lasts ______ .A. 66 minutesB.86 minutesC.126 minutesD.less than an hour47.The alie ns special weap on can ______A.kill huma n beingsB. make huma ns become alie nsC. make adults do what the alie ns wantD. make people on earth do what they want48.Stuart Pears on and his wife have _____ child/childre n.A.o nly oneB.twoC.at least threeD.at least four49. ____ fin d(s) the alie ns secret?A.StuartB.RickyC.Betha nyD.Stua rt's sons50. Which of the follow ing may be the end of the film?A. The alie ns have to lear n the earth.B. The brothers are have to kill Ricky.C. The aliens are beaten by the children' s parents.D. The aliens control all the members of Stuart ' s family.BOne day the mouse was surprised to see farmer and his wife took a mousetrap(捕鼠夹)from a bag.He ran to the farm yard and said, "There is a mousetrap in the house!”The chicke n said, "Mr.Mouse,it is your bus in ess.But to us,it does not matter. ”Then the mouse told the pig.The pig said, "lam so sorry,but there is nothing I can do about it but pray for you. ”The mouse told the cow. The cow said, "Wow.Mr.Mouse,l am sorry for you. ”So the mouse retur ned to the house.That very night a sound was heard throughout the house.The farmer' s wife ran to see what was caught.I n the dark ness,she did n't see a sn ake in the mousetrap and it bit(咬)her.When she retur ned home from the hospital,she still had a fever.Some one told the farmer the chicke n soup is good for fever,so the farmer killed the chicke n.But she was n't well. Frie nds and n eighbors came to sit with her around the clock.To feed them,the farmer killed the pig.But she died at last. So many people came. The farmer had to kill the cow for all of them to eat.And the mouse looked at it all with great sadness.51. The farmer and his wife put a mousetrap in the house to kill _____ .A. the mouseB.the chickenC.The snakeD.the cow52. _______________________ The mousetrap was .A.in the caseB.in the houseC.in the yardD.in the hospital53. _______________________ The pig prayed for .A.himselfB.the cowC.the chickenD.the mouse54. ____________________________________________ The underlined phrase ”around the clock ”means ___________________________________ in Chinese.A.夜以继日B.接近钟点C.在早上D.午夜55. _______________________ From the story,we know .A. We should learn from each other.B. The mouse is very kind.C. When one of us is dangerous,we are all in danger.D. When one of us need help,we should help him/her.CYou can keep cold away as short as two days.For seventy percent of people,when they catch a cold(得了感冒),they feel better in a week.But it is not usually to have the common cold for as long as two weeks.Why does your cold seen to be staying longer than it should? Here are some possible reasons.It is important for you to sleep well.In fact,a study showed that people can could easily if they got less than seven hours of sleep every night. So people shouldSleep for eight hours or more at night.Water plays an important part in our body.If your cold won ' t go away,you should drink morehot water.In fact,taking too much medicine(药)can make things worse.The common cold can easily mixed with other illnesses(病).Often,people believe they' ve had a cold for a few weeks and may not know they are not getting better because they ' ve been treating the wrong illness.People ask “Should I exercise when I have a cold? ”all the time.The answer is usually yes.But you should exercise less and listen to your body.For example,try taking a walk,instead of running five miles.If you exercise more,it is bad for your body.Of course,it ' ll make the cold stay longer.56. It takes most of the people who catch a cold ____ t o feel better.A.two daysB.less than one weekC.more than one weekD.two weeks57. If you sleep ___ a nigh,you can catch a cold more easily.A.less than seven hoursB.More than eight hoursC.nine hoursD.ten hours58. How many reasons are there about your cold staying longer than it should?A.ThreeB.FourC.FiveD.Six59. ________ can not make your cold staying longer than it should?A.Not getting enough restB.Taking too much medicineC.Exercising too hardD.Taking a walk60. According to the passage,which one is not right?A.Talking too much medicine does not help us get well soon.B. D rinking more cold water is good for the cold.C. To get well,we should tell other illnesses from the common coldD. Exercise is always good for you.B 卷(共75 分)一、Fill in the blanks according to the correct forms of the given words.(1*15 ')(一)The reason why I often go to that restaurant is that I like the wonderful__1__ there.And thebeef___2 __ with the sauce is really nice.(serve)(二)In China,It was ___3 __ f or one family to have more than one child.But now moreAnd more families have two children.(usual)(三) Michael can play many kinds of musical instruments, __ 4___(include)the piano,thesaxophone and so on.(四) Just keep quiet.Anything that you say now will make her even __ 5__.(angry)(五) One of the ___6___(active)students in my class __ 7___(be) Alex.(六) Thank you so much for __ 8___(give)her great help.But I still think she finish the taskby __ 9___(she)(七) --Would you and Rosie like ___ 10___(visit)my new home,James?--we' d love to.(八) James is talking a course on ___11___because he wants to be one of theexcellent__12 ____ in his company.(photograph)(九) Tom has started his own business which gets involved in ___13___(import)goods from foreigncountries.(十) The couple choose __ 14___(leave)the city because they both enjoy ___15_(live)in the openair.二、Pattern shift.(1 '*10)16. Walking along the river,you can see trees on both banks.=Walking along the river,you can see trees _____ ______ ________ .17. It' s 25 minutes' walk from my home to the cinema.=It' s _____ ______ ______ from my home to the cinema.18. Flora feels very tried these days and I feel very tired,too.=Flora feels very tried these days and ____ ____ ______ .19. The singer and actress,with the fans,is playing a game happily, ___ ____ ?20. I can see some butter and bread in the cupboard.(Change it into a negative sentence)Ask questi ons accord ing to the un derl ined part.21. We buy three packets of flour for the party.22. Sixty-five percent of the students do not know how to arrange their time.23. Mrs.Smith goes to the cinema with her husband once a week.24. We all think the food made by uncle Wang is nasty.25. My cousin Betty is interested in fixing things.三、Find and correct the only mistake in each sentence(1 '26. What does the idea sound?It sounds simple butuseful.A BCD27. How manybunch of bananas would the old woman with gray hair like to buy?A B C D28. You' d better say Can I have the bill,please? ”f you want to pay for the billAB C Din the restaura nt.29. T he man's job is make sure that all the equipmentwork wellA B C D30. What about the App?I find it ' sa great fun to talk to foreigners with it.A B C D三、Fill in the blanks according to the texts and the first letters given.Different people choose different places to live in Britain.Rosie ' s friend Maria lives in a stude nt h 31 ,with is called Eldo n House .It's in c__32__Bright on and has good f__33 ,Maria lives in a big bedroom.Although there ' no p 34 bathroom,there ' s a public one o ____________ 35 ___ her room.Rosie's brother James thinks there are some p _______________________ 36 ___ ,with the hotel he lives in .For example,there isn't a car park of a f __________ 37 __ center.We also know ac __ 38 _ who live on a boat called Castle Ede n. They thi nk the boat is big e __ 39__for them andthe a ___ 40 _ .There is also an e__41__room on the boat to provide hot water.However,most people in Brita in live in their own house.A t ___ 42 __ B ritish house has two f 43 ____ and it is for a family of two to four people.Richard Gere is a s ___ 44 __ f ilm star in Hollywood.With gray hair and brow n eyes.he looks really h__45 _ .He is popular with many people,e ___ 46 ____ w ith f__47__ a ___ 48 __ .His wife is a m __ 49 ___ ,actress and TV p ___ 50 _ .Both of them live in the USA.四、Choose the right sentence to complete the conversation.A:Excuse me.What can I do for you?B: _____ 51 __ -A:Yes, ____ 52 ____B:A poun d,please.A:OK.A pound of French cheese.A nything else?B: _____ 53 ______A:sorry,we have not got any oil toda y.It is all sold out.B:OK,That ' s all. ______ 54 __A:Let me see.That' s 坯.20.B:Here you are.A:Tha nk you. _ 55 ____B:Tha nk you.五、Choose 10 from the 12 words in the box to complete with their proper forms.Each word can be used only on ce.You probably think you will never be a top student. In fact,__56__can become a better student if he or she __57__to.If you can use your time well,you may improve your study 58 much work.Here is how:Find a good place to study. _ 59 ___ f or a good place to study in the house .It can be a desk or just a corner of your room.No games,radio or television.When you sit down to work,try 60__only about the subject.Make good use of your time in class.Liste n __ 61 ___ to what the teacher says. The more carefully you listen.the _______ 62 _work is needed later. You also need to take notes inclass.because it can ____ 63 __ it easier for you to lear n well.Pla n your time well.You should make a list of things that you have to do. First,write dow n the time foe eat ing ________ 64 _ ,dress in g,etc.There decide on a good time for study in g.Of course,study ing should not ___ 65 _all of your time.D on ' t forget to leave yourself eno ugh time for hobbies.六、Writing(IO)You have stayed in our school for more than one year.What do you think of your schoollife?Please write a composition about it with 80-120 words.The following points should be in cluded:1. Is it good for you to study in our school?2. Give at least two reasons to support your opinion(支持你的观点)3. Give at least two suggesti ons(建议)to the school.。

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