2018年从化区初中毕业生综合测试试卷和答案

2018 年初中毕业班综合测试（一）数学本试卷分选择题和非选择题两部分，共三大题25 小题，满分150 分．考试用时120 分钟．注意事项：1.答卷前，考生务必在答题卡第1 面、第3 面、第5 面上用黑色字迹的钢笔或签字笔填写自己的考生号、姓名；填写考场试室号、座位号，再用2B 铅笔把对应的标号涂黑。

2.选择题每小题选出答案后，用2B 铅笔把答题卡上对应题目的答案标号涂黑；如需改动，用橡皮擦干净后，再选涂其他答案标号；不能答在试卷上．3.非选择题必须用黑色字迹的钢笔或签字笔作答，涉及作图的题目，用2B 铅笔画图．答案必须写在答题卡各题指定区域内的相应位置上；如需改动，先划掉原来的答案，然后再写上新的答案；改动的答案也不能超出指定的区域．不准使用铅笔、圆珠笔和涂改液．不按以上要求作答的答案无效。

4.考生必须保持答题卡的整洁，考试结束后，将本试卷和答题卡一并交回。

第一部分选择题（共30分）一、选择题（每小题3分，共30分，每小题给出的四个选项中，只有一项符合题意）1.比0 小的数是( ※ ) 。

A．-1 B．0 C．1D．1 22.下列事件中，属于必然事件的是( ※ ) 。

A．明天太阳从北边升起B．实心铅球投入水中会下沉C．篮球队员在罚球线投篮一次，投中D．抛出一枚硬币，落地后正面向上3.下列计算正确的是( ※ ) 。

A．4a2 - 3a2 =1 B．a8 ÷a4 =a2C．(-2x2 y)3 =-8x6 y3 D．a2 +a3 =a55 3 2 105 4. 下列图形中，既是轴对称图形又是中心对称图形的是 ( ※ ) 。

A. B ． C ． D ．5. 若 a < 1 ，A. - a -1＝（ ※ ）。

B. a C ．2 - aD ． a - 26. 在平面直角坐标系中，若直线 y = kx + b 经过第一、二、四象限，则直线 y = bx + k 不经过的象限是 ( ※ ) 。

最大最全最精的教育资源网2018 年从化区初中毕业生综合测试数学参照答案与评分标准明： 1．本解答出了一种解法供参照，假如考生的解法与本解答不一样，各学校可依据的主要考内容对比分准制相的分．2．解答中的算，当考生的解答在某一步出，假如后部分的解答未改的内容和度，可影响的程度决定后部分的得分，但所分数不得超部分正确解答得分数的一半；假如后部分的解答有重的，就不再分．3．解答右端所注分数，表示考生正确做到一步得的累加分数．4．只整数分数，和填空不中分．一、：（本大考基本知和基本运算．共10 小，每小 3 分，共 30 分）号12345678910答案B A C D D C B B C A 二、填空：（本大基本知和基本运算．共 6 小，每小 3 分，共 18 分）号111213141516答案1500x( x y)x 1x＞35①③⑤22三、解答（本大共9 小，分102 分．解答写出文字明、明程或演算步）17．（本小分9 分）解：解不等式2x17 ，解得： x3⋯⋯⋯⋯⋯⋯ 2 分由不等式 x 1 0 ，解得： x1⋯⋯⋯⋯⋯⋯ 4 分∴原不等式的解集是： 1 x3⋯⋯⋯⋯⋯⋯ 7 分∴ 个不等式的解集在数上表示以下：⋯⋯⋯⋯⋯⋯9 分18. （本小分9 分）（方法一）明：∵四形ABCD 是平行四形∴∠ A= ∠ C， AD=CB⋯⋯⋯⋯⋯⋯3分又∵ AE=CF∴△ ADE ≌△ CBF⋯⋯⋯⋯⋯⋯6分∴ DE=BF ．⋯⋯⋯⋯⋯⋯9 分（方法二）明：∵四形ABCD 是平行四形∴ DF∥BE， CD= AB⋯⋯⋯⋯⋯⋯ 3 分∴ DF=BE⋯⋯⋯⋯⋯⋯ 6 分∴四形DEBF 是平行四形∴ DE=BF ．⋯⋯⋯⋯⋯⋯9 分19.（本小分 10 分）a b=a2b2a2b2解：（ 1）Ab)a( a b)ab(a b) ab(a b)b(a b) ab( a( a b)( a b)a b ．⋯⋯⋯⋯⋯⋯ 5 分ab(a b)ab（ 2）解方程x24x120 ，得x1 2 ， x2 6 ，即a 2 ， b6．⋯⋯9分因此 A a b41⋯⋯⋯⋯⋯⋯ 10 分ab123（明：用达定理获得即a b4, ab12 相分．）20.（本小分 10 分）解：（ 1）∵抽的人数：20÷40%=50 人，⋯⋯⋯⋯⋯⋯2分∴C 人数 =50 20 5 15=10 人，全条形以下：学生用各样品人数条形⋯⋯⋯⋯⋯⋯ 4 分（ 2）“碳酸料”所在的扇形的心角度数：10 503600= 72 0⋯⋯6分（ 3）列表得：女女女男男女﹣﹣﹣（女，女）（女，女）（男，女）（男，女）女（女，女）﹣﹣﹣（女，女）（男，女）（男，女）女（女，女）（女，女）﹣﹣﹣（男，女）（男，女）男（女，男）（女，男）（女，男）﹣﹣﹣（男，男）男（女，男）（女，男）（女，男）（男，男）﹣﹣﹣⋯⋯⋯⋯⋯⋯ 8 分或画状得：⋯⋯8分全部等可能的状况数有20 种，此中一男一女的有12 种，因此 P（恰巧抽到一男一女）= 12=3．⋯⋯⋯⋯⋯⋯10 分20 521.（本小分 12 分）解：（ 1）尺作如所示；⋯⋯⋯⋯⋯⋯ 4 分（2）∵ AB=AC ，∴∠ ABC= ∠ C，⋯⋯⋯⋯⋯⋯6分∵∠ A=36°，∴∠ ABC= ∠ ACB= （ 180° 36°）÷2=72°，⋯⋯⋯⋯⋯⋯8 分∵BD 均分∠ ABC ，∴∠ABD= ∠ DBC=36°，∴∠ BDC=36° +36°=72°，⋯⋯⋯⋯⋯⋯10 分∴BD=BC ，∴△ DBC 是等腰三角形．⋯⋯⋯⋯⋯⋯12分22.（本小分 12 分）解：（1）小明同学成x 分，平成y 分，依意得：x y18580%x 20% y91⋯⋯⋯⋯⋯⋯ 3 分解得： x90 ， y 95答：小明同学成位90 分，平成95 分；⋯⋯⋯⋯ 6 分（ 2）由意可得：80-70 ×80%=24 ，⋯⋯⋯⋯7分24÷20%=120>100 ，故不行能．⋯⋯⋯⋯8分（ 3）平成分，即100 分，合成100×20%=20，成m 分，依据意可得：20+80% m80，⋯⋯⋯⋯ 10 分解得： m75答：他的成起码75 分．⋯⋯⋯12分23. （本小分12 分）（ 1）接 CB， CD ，⋯⋯⋯⋯⋯⋯ 1 分∵⊙ C 与 x ， y 相切于点D， B ，且半径2∴∠ CBO= ∠ CDO=90° =∠ BOD ， BC=CD ，∴四形BODC 是正方形，⋯⋯⋯⋯⋯⋯2分∴BO=OD=DC=CB=2 ，∴ B （0,2），点 C（ 2,2）⋯⋯⋯⋯⋯⋯3分把点 C（ 2,2）代入反比率函数y k2中，x解得：k2=4，∴反比率函数分析式：y 4⋯⋯⋯⋯⋯⋯ 4 分x∵点 A(4, m) 在反比率函数4上，把 A ( 4, m)代入y4y中，4x x = 1，∴A (4,1)⋯⋯⋯⋯⋯⋯ 5 分m4把点 B（ 0,2）和 A (4,1) 分代入一次函数y k1x b中，得出：4k1 b1，⋯⋯⋯⋯⋯⋯ 6 分b 2k13解得： 4 ，⋯⋯⋯⋯⋯⋯ 7 分b 2最大最全最精的教育资源网∴一次函数的表达式：y 3 x2⋯⋯⋯⋯⋯⋯ 8 分4（ 2）接 OA ，∵ OB=2 ，点 A 的横坐 -4，∴△ AOB 的面：2 41=4⋯⋯⋯⋯⋯⋯ 10 分2（ 3）当x 0，k1x b k20的解集： 4 x 0⋯⋯⋯⋯⋯⋯12分x24.（本小分 14 分）解：（ 1）∵ A （﹣ 1，0），C（0，﹣ 3）在 y x 2bx c 上，1 b c0∴，c3解得：b2 ，c3⋯⋯⋯⋯⋯⋯ 1 分∴二次函数的分析式为y x22x 3 ；⋯⋯⋯⋯⋯⋯ 2 分（ 2）在y x 22x3中，令y=0可得0x22x 3，解得x =3或x =﹣，1∴B（3，0），⋯⋯⋯⋯⋯⋯ 3 分BC 所在的直方程y kx b(k0) ，把B（3，0）、C（0，3）代入得：3k b 0，解得：k1b3b3∴ B、 C 两点的直方程： y= x 3，⋯⋯⋯⋯⋯⋯⋯⋯ 4 分如图，过点 P 作 PD⊥ x 轴，垂足为 D，与直线 BC 交于点 E，设点 P 的坐标为（ x ，x22x3），则E（x，x﹣3），∴ EP=(x 3) (x2 2x 3)=3x x2⋯⋯⋯⋯⋯⋯⋯⋯ 5 分∵AB=4 ， OC=3， OB=3∵ S 四边形ABPC =S△ABC +S△BCP= × 4× 3+（3 x ﹣ x 2）× 3= 3 x29x 6 =3(x3)275 ，⋯⋯⋯⋯⋯⋯⋯⋯ 6 分22228∴当 x 3时，四边形 ABPC 的面积最大，此时 P 点坐标为（，﹣），⋯7 分275 ；∴四边形 ABPC 的最大面积为⋯⋯⋯⋯⋯⋯⋯⋯ 8 分8（3）∵ y= x 2﹣2 x ﹣3=（ x ﹣1）2﹣4，∴对称轴为 x =1，∴可设 Q 点坐标为（ 1，t），∵ B（ 3， 0），C（ 0，﹣ 3），∴BQ2=（1﹣3）2+t2=t2+4，CQ2=12+（t+3）2=t2+6t+10，BC2=18，⋯⋯⋯⋯⋯9分∵△ QBC 为直角三角形，∴有∠ BQC=90°、∠ CBQ=90°和∠ BCQ=90°三种状况，①当∠ BQC=90°时，则有BQ2+CQ2=BC2，即t2+4+t2+6t+10=18，解得t=或t=，此时 Q 点坐标为（ 1，）或（1，）；⋯⋯⋯⋯⋯11分②当∠ CBQ=90°时，则有BC2+BQ2=CQ2，即t2+4+18=t2+6t+10，解得t=2，此时Q 点坐标为（ 1，2）；⋯⋯⋯⋯⋯12分③当∠ BCQ=90°时，则有BC2+CQ2=BQ2，即18+t2+6t+10=t2+4，解得t=﹣4，此时 Q 点坐标为（ 1，﹣ 4）；综上知 Q 点的坐标为（ 1，）或（ 1，）或（1，2）或（1，﹣ 4）．⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯14 分25．（本小分14 分）（ 1）∵ AB 是⊙ O 的直径∴∠ ACB=90°，∵∠ ACB= ∠ BCD+∠ACD当 m=2 时，即∠ BCD=2∠ACD∴∠ ACB=2 ∠ACD+ ∠ACD=3 ∠ ACD=90°则∠ ACD=30°，∠ BCD=60°⋯⋯⋯⋯⋯ 1 分⋯⋯⋯⋯⋯ 2 分（2）如图 2，连接 OD．∵，AB=4，∴，则，⋯⋯⋯ 3 分解得∴⋯⋯⋯⋯⋯ 4 分要使 CD 最短，则 CD⊥AB 于 P∴，∴∠ POD=30°∴∠ ACD=15°，∠ BCD=75°⋯⋯⋯⋯⋯ 5 分∴∠ BCD=5∠ACD∴m=5，故存在这样的 m 值，且 m=5⋯⋯⋯⋯⋯6分（ 3）如图 3，连接 AD 、 BD．由（ 1）可得∠ ABD= ∠ ACD=30°，AB=4∴AD=2，，∵，∴，，⋯⋯⋯⋯⋯8分∵∠ APC=∠ DPB，∠ ACD= ∠ ABD∴△ APC∽△ DPB∴，∴①，⋯⋯⋯⋯⋯9分②⋯⋯⋯⋯⋯ 10 分同理△ CPB∽△ APD∴，∴③，⋯⋯⋯⋯⋯11分由①得，由③得∴，∴，∴ DP=⋯⋯⋯⋯⋯12分由② PC?DP=PC?=，得PC=，⋯⋯⋯⋯⋯13分∴ DC=CP+PD=．⋯⋯⋯⋯⋯14分。

秘密★启用前2018年从化市初中毕业生综合测试数 学本试卷分选择题和非选择题两部分，共三大题25小题，共4页，满分150分．考试时间120分钟．第一部分 选择题 (共30分)一、选择题(本大题共5小题，每小题3分，共15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、下列图形中，既是轴对称图形又是中心对称图形的是 （ * ）2、下列运算正确的是（ * ）A 、1)1-21)(2(=+B 、C 、D 、3、下列函数中，图象经过点（－1，2）的反比例函数解析式是（ * ）A 、1y x =B 、1y x -=C 、2y x =D 、2y x-=4、下列一元二次方程中，有两个不相等的实数根的是（ * ） A 、0122=++x x B 、022=+x C 、032=-x D 、0322=++x x5、如图4，这是中央电视台“曲苑杂谈”中的一副图案，它是一扇形图形，其中AOB ∠为120，OC 长为8cm ，CA 长为12cm ，则阴影部分的面积为（ * ）A 、2112πcm B 、2144πcmC 、2152πcmD 、264πcm第二部分 非选择题 (共120分)二、填空题（本大题共11题，每题3分，满分33分）6、a 是3的倒数，那么a 的值等于（ * ）7、如图1，已知△ABC 为直角三角形，∠C =90°，若沿图中虚线剪去∠C ，则∠1+∠2等于 ( * )8、如果两圆半径分别为3和4，圆心距为6，那么这两圆的位置关系是 （ * ）yAC OB图4图1xy1-11P M N O 18题图图39、已知一次函数2)1(++=x m y 的图象如图2所示，那么m 的取值范围是（ * ）10、如图3，小王同学从A 地沿北偏西60º方向走100m 到B 地，再从B 地向正南方向走200m 到C 地，此时小王同学距离A 地 （ * ）11、随着中国综合国力的提升，近年来全球学习汉语的人数不断增加．据报道，2018年海外学习汉语的学生人数已达38200 000人，用科学记数法表示为 * 人；12、要使二次根式6-x 有意义，x 应满足的条件是 * ． 13、如图5，若□ABCD 与□EBCF 关于BC 所在直线对称，∠ABE ＝90°，则∠F 的 度数为 * 。

2017-2018学年广东省广州市从化区初中毕业班综合测试英语试卷一、语法选择1.When I was twelve years old, my family lived next to a forest. Every evening, mockingbird （知更鸟）would come and rest in the trees and sing. I enjoyed（1）______ singing so much that I decided to catch a young bird. In this way, I（2）______ hear it sing for me every day.I finally succeeded in catching（3）______ and put it in a cage. At first, the bird was very frightened, so it fluttered（扑腾）in（4）______ new home all the time. Several days later, it was used to（5）______ in this new home.The next day, the little bird's mother flew to the cage with some（6）______ in her mouth. The baby bird looked very happy and ate everything（7）______ the mother brought to it. I was so happy to see this,（8）______ the mother knew how to take care of her baby well.But（9）______ the third morning, I found it died. I was terribly surprised and cried at once. I didn't know（10）______ happened.Arthur Wayne, my father's friend, was a famous ornithologist（鸟类学家）. She（11）______ my father at that time.（12）______ she knew the whole thing, she explained to me. If a mother mockingbird finds her baby（13）______ in a cage, she will bring it poison berries （毒莓）. She thinks it's（14）______ for her baby to die than to lose freedom.Since then I（15）______ any living animal and put it in a cage. All living things have a right to live free.（1）A aB anC theD /（2）A couldB had toC mustD should（3）A itB oneC otherD another（4）A it'sB itsC itD its'（5）A liveB livesC livedD living（6）A foodsB foodC foodesD feed（7）A thatB whatC whoD where（8）A certainB uncertainC certainlyD uncertainly（9）A inB forC atD on（10）A whatB howC whyD where（11）A visitedB have visitedC is visitingD was visiting（12）A IfB WhenC BecauseD Although（13）A keepB must keepC is keepingD is kept（14）A goodB wellC betterD best（15）A haven't caughtB won't catchC don't catchD didn't catch二、完形填空2.The story goes that some time ago a man had a very lovely little daughter. One day the man （1）______ his 3-year-old daughter for wasting a roll of wrapping paper because they were short of money. The man became（2）______ when the child tried to decorate（装饰）a（3）______ to put under the Christmas tree. However, the little girl brought the gift to her fatherthe next morning and said, "This is for you, Daddy."The man was（4）______ by what he did earlier, but his anger came out again when he found out the box was（5）______. He shouted at her, "Don't you know, when you give someone a （6）______, there is supposed to be something inside?" The little girl looked up at him with tears in her eyes and cried, "Oh, Daddy, it's not empty at all. I（7）______ kisses into the box. They are all for you, Daddy."The father was greatly moved. He put his（8）______ around his little girl, and he begged for her forgiveness.In a very real sense, each one of us, as human beings, has been given a gold box（9）______ with love and kisses—from our children, family members and friends. There is simply no other（10）______, anyone could hold, more valuable than this.（1）A askedB beggedC praisedD punished（2）A upsetB sadC angryD amazed（3）A boxB ballC hallD room（4）A angryB satisfiedC ashamedD proud（5）A heavyB fullC emptyD good（6）A presentB treeC dayD paper（7）A ranB blewC paidD played（8）A legsB eyesC armsD heart（9）A pleasedB sharedC crowdedD filled（10）A possessionB loveC feelingD world三、阅读理解3.Lin Xiao, 21, a student at Guangdong University, has a big family—her parents, a younger brother and two younger sisters. Lin takes her role as the "big sister" seriously. When her first sister was born, Lin took turns with her mom holding the baby late into the night. "I almost did everything that was supposed to be a parent's job, but I felt proud of myself," she said.Not all of Lin's classmates shared her experiences because of the family planning policy（政策）. The one-child policy has been carried out in China for about forty years. But the situation has changed. A new policy made on October 29 said all couples can now have two children.The new policy is expected to help raise the population of China. Recently, China has been facing an aging population and working-people shortages because of the low birth rate（比率）. The two-child policy may also be the gift for every only child. Researchers found thatgrowing up with a brother or sister can have good influence on one's mental（心理）health. "Brothers and sisters do matter in unique ways. They give kids something that their parents don't," Laura Walker, a professor from Beijing University, told China Daily. She noted that having a brother or a sister protects teenagers against loneliness, fear and so on.Liu Fang, 20, from Shenzhen University, has a 2-year-younger sister. When her sister disagreed with parents over choosing a college major, she helped her to communicate with her parents. "If necessary, I would always support her," said Liu. "The best part of having a sister is that you have a partner, friend and supporter throughout your life.""But children with brothers or sisters also have to learn to understand and look after each other," said Laura.（1）There are ______ children in Lin Xiao's family.A threeB fourC fiveD six（2）The one-child policy caused some problems except ______.A the aging populationB working-people shortageC the populationgrowth D the low birth rate（3）What does the underlined word "unique" in paragraph 4 possibly means ______ in Chinese.A 独特的B 相同的C 对立的D 相反的（4）We can infer from the article that ______.A Lin Xiao doesn't like her sisterB Liu Fang has a 2-year-old sisterC Laura is against the two-child policyD The one-child policy is out of date now（5）What is the passage mainly about?A Brothers and sisters are good for us.B The family planning policy is bad.C The two-child policy helps raise the population.D China has been facing an aging population.4.The following are some people's opinions on using cell phones.I believe that cell phones are not to be used while driving. One site said that talking on a cell phone while driving had the same results of drunk driving accidents! Also I think it is very impolite to use your phone in a public place! Once I was in a doctor's office, and people were very quiet. A woman's cell phone started ringing. After what seemed a million rings, she started to talk on her little "toy", annoying everyone.—Chelsea from the USThe cell phone would be a great thing if we used it in the right way. Unfortunately most of us don't use it in the right way because we talk with our friends for hours and hours, and that's something we can do better if we have a coffee together. The use of the cell phone in this way is dangerous for the development of good communication. We need to think twice about how we are using cell phones.—Graciela Flores form MexicoOnce when I was studying in the library, I was reading my book. Suddenly, a cell phone rang. Iwas so annoyed because those students didn't have good manners in public. I looked at them in anger, but they didn't pay attention. Nowadays, many young students use cell phones everywhere in my country just for talking to their friends. It keeps students from studying. —Seung-Hye Lee from KoreaI think cell phones should be banned（禁止）in cars and airplanes. It is very clear that people's attention is diverted if they talk on cell phones while they are driving. The numberof car accidents caused by drivers, using cell phones has risen, so people should not use them when they are driving. Also, it is dangerous to use them in airplanes because the phone signals can interrupt the airplane's signal system.—Yian Ma from China（1）What does Chelsea probably agree with?A Cell phones shouldn't be used in public.B The woman is suffering from a bad disease.C Having a drink is exactly like using a cell phone.D The rings of the cell phones are wonderful.（2）Who holds that it is harmful to talk on the cell phone for a long time?A Yian Ma.B Chelsea.C Graciela Flores.D Seung-Hye Lee.（3）According to Seung-Hye Lee, what's the bad effect of young students' using cell phones?A It is dangerous for the development of good communication.B They are kept away from their studies.C They can't read books in the library.D They can't talk to their friends as they like.（4）People that think using cell phones while driving may lead to accidents are from ______.A Korea and the USB Mexico and ChinaC the US and MexicoD China and the US（5）What is the passage mainly about?A Cell phones can be used in different ways.B How to use cell phones whiledriving. C Cell phones should be used properly. D People quarreled over using cell phones.5.Roald Dahl was one of the most successful writers of children's books. He sold millions of books all over the world. Many of his books have been made into films and videos. He is so famous that there is even a Roald Dahl Museum you can visit.Roald Dahl was born in 1916 in Wales, Britain. His father was rich but he died when Roald was very young. Roald and his mother lived a hard life. He had to leave school and went to Africa where he worked for an oil company.In 1939, Roald became a pilot, but he had a bad accident. It made him limp（瘸的）for the rest of his life. After this, Roald went to America where he wrote a story about his experience as a pilot. It was so good that it was put in a magazine.Roald married an American film star. They bought a house in England and had five children. From 1960 to 1965, ______: Theo, one of his children, was hit by a taxi and was seriously hurt. Olivia, one of Roald's daughters, died of a strange illness. Soon after this, his wife also had aserious illness. It took her years to get completely better.Gradually Roald became more and more successful. He always did his writing in an old shed （棚）at the back of his house. He always sat in the same old armchair with a wooden board on his lap."One of the nice things about being a writer," he once said, "is that all you need is what you've got in your head and a pencil and a bit of paper."In 1983, Roald won a big prize for his book The BFG. During his life, Roald wrote many famous books, such as Charlie and the Chocolate Factory, Matilda, Fantastic Mr. Fox.After he died in 1990, Roald left money to help people with serious illnesses and those with problems in reading and writing.（1）Roald Dahl was famous as a(n) ______.A doctorB teacherC actorD writer（2）After Roald went to America, he ______.A lost his parents in a plane accidentB wrote a story about his pilotexperience C got married with an English film star D won a big prize for his book Matilda（3）Which of the following is the best for the blank（空格）in Paragraph 4?A they lived a happy lifeB three terrible things happenedC he went on writing booksD he created some unlucky characters（4）Which of the following is right?A Roald became a pilot before he went to Africa.B His daughter Olivia was hit by a taxi.C Roald was 74 years old when he died.D Roald lived a rich life all his life.（5）In which order did the events take place?a. Roald got married with a film star.b. Roald had to work for an oil company in Africa.c. Roald wrote a story about his experience as a pilot.d. Roald won a big prize for his book The BFG.e. Roald's wife had a serious illness.A c-b-a-d-eB c-b-a-e-dC b-c-a-e-dD b-c-e-d-a6.School activities for kids and teensJuly is a month of fun-filled activities for kids and teens as long as you know where to find them. When you want some fun activities for July, consider these ideas happening in this month.Bookings: Phone the booking office: 34032578Address: Brisbane Botanic Gardens Note: Secret of the Dragon is a magical story about two children who are taken on a dragon ride to explore the universe. Bookings: Phone the booking office: 34037689Address: Brisbane Botanic Gardens Note: Are we truly alone in space? Is there any life out there? These are the questions asked in this show.Magic ClassTime: Friday, July 12, 2013, 10:00am Cost: FreeBookings: Please call 34038470 to book your place.Address: Centenary Community hub, 171 Dandenong RdNote: Would you like to be a magician? Then join David, the magician, to learn about real magic with playing cards, coins, ring ropes and DIY projects and be able to become the life of the party. Science with Me: Making your own guitar Time: Saturday, July 20, 2013, 3:00pm Cost: FreeBookings: Please phone 34031226 to book your place.Address: 10, Egginton CloseNote: Do you want to make a guitar with Katy and her mom? Science with Me is going to be with you. Please remember to bring a piece of wood, a hammer, some rubber bands and some nails with you.（1）Alec is strongly interested in space life. He may go to ______.A Magic ClassB Science with MeC Secret of the DragonD The Search for Life（2）John and his 10-year-old son want to watch Secret of the Dragon.How much should they pay?A ＄7.40.B ＄11.10.C ＄14.80.D ＄23.20.（3）Rita plans to join Magic Class. She may learn about ______.A real magicB making coinsC magic storiesD holding parties（4）According to the text, making a guitar needs the things except ______.A a piece of woodB a hammerC some nailsD ring ropes（5）What do the four activities have in common?A They are all free.B They happen in the same place.C They are all weekend activiti es.D They can all be booked by phone.四、阅读填空7.根据短文内容，从下面五个选项中选出能填入文中空缺处的最佳选项，使短文意思通顺，内容完整。

2018年从化市初中毕业生综合测试数学试题参考答案说明：1．参考答案与评分标准指出了每道题要考查的主要知识和能力，并给出了一种或几种解法供参考，如果考生的解法与参考答案不同，可根据试题主要考查的知识点和能力比照评分标准给以相应的分数．2．对解答题中的计算题，当考生的解答在某一步出现错误时，如果后继部分的解答未改变该题的内容和难度，可视影响的程度决定后继部分的得分，但所给分数不得超过该部分正确解答应得分数的一半；如果后继部分的解答有较严重的错误，就不再给分．3．解答右端所注分数，表示考生正确做到这一步应得的累加分数．4．只给整数分数，选择题和填空题不给中间分．一、选择题：本题考查基本知识和基本运算，每小题3分，满分30分．三、解答题：本题考查基本知识和基本运算，及数学能力，满分102分． 17、（本题满分9分）本小题主要考查分式方程等基础知识，考查运算求解能力 解：移项得：2321+=-x x ……………………………………1分 方程两边同乘以)2)(2(+-x x ，得)2(32-=+x x ……4分 解这个方程，得4=x ………………………………………7分 检验：将4=x 代入原方程，得左边===6321右边…………8分 所以，4=x 是原方程的根………………………………9分 18、（本题满分9分）本小题主要考查平移和正比例函数等基础知识，考查运算求解能力 解：（1）如图所示图正确……………………………………4分 （2）由已知设直线OP 的函数解析式为：y=kx ……… 6分 因为点P 的坐标为（－2，3），代入，得3＝－2k ……7分32k ∴=- …………………………………………8分即直线OP 的函数解析式为：32y x =-………………9分19、（本题满分12分）本小题主要考查统计等有关知识，考查看图表与识图表能力解：（1）1－28%－34%=38% ················································································ 2分（没有计算过程扣1分）（2）A=1－0.35－0.32－0.18=0.25 ······························································ 4分768÷0.32=2400 ················································································· 5分 B=2400－768－600－192=840 ································································ 7分 ∴A 的值为0.25，B 的值840 ································································· 8分 （没有计算过程扣2分） （3）408341200÷=％ ·········································································· 10分240012002÷= ············································································· 11分 ∴该校学生平均每人读2本课外书． ························································ 12分 （没有计算过程扣1分）20、（本题满分10分）本小题主要考查概率等基础知识，考查运算求解能力解：由已知得：共组成4组边，即2,3,5；3,3,5；3,4,5；3,5,5，……………………2分 （1）依题意，3,3,5；3,4,5；3,5,5，有3组能构成三角形, ···························· 4分∴43)(=构成三角形P ········································································· 6分 （2）依题意,3,3,5和5,3,5两组能构成等腰三角形 ······································· 8分∴2142)(==构成等腰三角形P ······························································· 10分 21、（本题满分12分）本小题主要考查直角三角形、全等三角形和近似计算等基础知识，考查综合运用知识分析问题和解决问题的能力 解：(1)∵AB 切⊙O 于点B,∴0B ⊥AB,即∠B=90° ··········································································· 1分 ∵CD ⊥OA, OA 交⊙O 于C 点, ∴CD 是⊙O 的切线, ∠ODC=90° ···························································· 3分 在Rt △COD 与Rt △B 0D 中, ∵OD=OD,OB=OC∴Rt △CO D≌ Rt △B 0D ············································································ 6分(2) ∵∠A=32°, AD=8, ADCDA =sin ∴832sin CD =,则CD=832sin ··························································· 8分 ∵∠A=32°, ∴∠ADC=58°则∠CDB=122° 由(1)知Rt △CO D≌ Rt △B 0D, ∴∠CDO=∠BDO=21×122°=61° ····················· 10分 ∴tan 61°=CDOC, ∴OC=tan 61°×CD=8×32sin ×tan 61°≈7.65㎝则⊙O 的半径约为7.65㎝ …………………………………………………………12分22、（本题满分12分）本小题主要考查二元一次方程组的应用等基础知识，考查数学推理论证能力、运算求解能力解：（1）∵100×13＝1300<1392 …………………………………………………………3分∴乙团的人数不少于50人，不超过100人…………………………………………4分 （2）设甲、乙两旅行团分别有x 人、y 人…………………………………………5分则⎩⎨⎧=+=+1080)(913921113y x y x ……………………………………………………………………9分解得：⎩⎨⎧==8436y x …………………………………………………………………………11分答:所以甲、乙两旅行团分别有36人、84人 。

2018-2019学年广州市从化区九年级（上）期末考试化学试卷一、单选题1.空气中体积分数最大的气体是（）A. 氧气B. 氮气C. 二氧化碳D. 稀有气体2.地壳中含量最多的元素是（）A. HB. OC. SiD. Al3.化学变化前后发生改变的是（）A. 元素种类B. 原子个数C. 分子种类D. 原子质量4.下列物质的用途中，利用了其化学性质的是（）A. 氧气用于医疗急救B. 干冰用于人工降雨C. 铜用作制导线D. 黄金用作制首饰5.紫薯富含淀粉、蛋白质、维生素、钾、铁、钙、硒等，具有特殊的保健功能。

其中的押、铁、钙、硒指的是（）A. 单质B. 原子C. 分子D. 元素6.下列物质中属于氧化物的是（）A. Al2O3B. O2C. NaClD. Mg(OH)27.下列物质中，由原子直接构成的是（）A. 氮气B. 金刚石C. 水D. 氯化钠8.下列物质中，含有氧分子的是（）A. H2OB. O2C. CO2D. H2O29.关于化学反应C+O2CO2，下列说法错误的是（）A. 该反应条件是点燃B. 该反应为化合反应C. 该反应为吸热反应D. 参加反应的碳和氧气的质量比为3：810.下列图标中,表示“禁止烟火”的是( )A. B. C. D.11.卫星运载火箭的动力由高氯酸铵（NH4ClO4）发生反应提供，化学方程式为：2NH4ClO4N2↑+Cl2↑+2O2↑+4X．则X的化学式是（）A. H2B. H2OC. H2O2D. HCl12.下列实验操作一定能达到实验目的是（）A. AB. BC. CD. DA. AB. BC. CD. D二、填空题14.化学用语是简明、信息丰富、国际通用的语言，请用化学用语填空：（1）氢氧根离子________；（2）石墨________；（3）氟化钙________；（4）五氧化二磷中磷元素的化合价________；（5）根据铝离子的结构示意图写出铝离子的符号________；（6）写出由原子形成化合物的化学式________。

2018年从化区初三综合测试英语试题答案一、语法选择1-5 BDBCA 6-10 ACBCB 11-15 CBDAD二、完形填空16-20 DCCAC 21-25 ACBCA三、阅读第一节阅读理解(A) BCA BC (B) CADBA (C) BDADC (D) DCAAB 第二节阅读填空 C EABD四、写作第一节单词拼写总原则：写出词根，但形式错误扣半分。

大小写错误扣0.5分。

51. healthy 52. perfect 53. Although 54. without 55. underground 56. afford第二节：完成句子总原则：写出词根，但形式错误扣半分。

大小写错误扣0.5分。

57.How long, it take58.so that he can59.What useful60.was built61. neither, nor62. In my opinion / view63. if / whether I could buy第三节：书面表达参考范文：NOTICE June 25 In order to enrich the life of the residents (居民)，the Community Union is going to organize a special activity for next Saturday.We have organized a bus trip to Happy Farm for foreigners, where we plan to pick lychees (1分). We will gather at the North Gate at 8 a.m. and return at 4:30 p.m. next Saturday (1分). During the trip, we can appreciate the natural beauty in the countryside and have fun in farming work (1分). Of course, you can take an umbrella so as not to get sunburnt. Besides, your safety should be taken into consideration (2分).Sign your name in our office before 6:00 p.m. next Thursday if you are interested. (1分) Wish you have a wonderful time !The Community Union1。

机密★启用前2018年广东省初中毕业生学业考试语文说明：1.全卷共6页，满分120分，考试时间为120分钟。

2.答卷前，考生务必用黑色字迹的签字笔或钢笔在答题卡填写自己的准考证、姓名、考场、座位，用ZB铅笔把对应该码的标涂黑。

3.答题必须用黑色字迹的钢笔或签字笔作答，答案必须写在答题卡各题目指定区域内相应位置上；如需改动，先划掉原来的答案，然后再写新的答案；不准使用铅笔和涂改液，不按以上要求作答的答案无效。

4.本试卷设有附加题，共10分，考生可答可不答；该题得分作为补偿分计入总分，但全卷最后得分不得超过120分。

5.考生务必保持答题卡的整洁。

考试结束时，将试卷和答题卡一并交回。

一、基础（24分）1．根据课文默写古诗文。

（10分）①蝉则千转不穷，口口口口口口。

（吴均《与朱元思书》）②南宋诗人赵师秀《约客》中“口口口口口口口，口口口口口口口”的诗句表现了作者独坐灯下的寂寞心情。

（2分）③轮台东门送君去，去时雪满天山路。

口口口口口口口，口口口口口口口。

（岑参《白雪歌送武判官归京》）（2分）④口口口口口，飞鸟相与还。

（陶渊明《饮酒》）⑤请把韩愈的《左迁至蓝关示侄孙湘》默写完整。

（4分）一封朝奏九重天，夕贬潮阳路八千。

欲为圣明除弊事，肯将衰朽惜残年。

口口口口口口？口口口口口口。

口口口口口口，口口口口口口。

2．按拼音写词语。

（4分）①有几个园里有古老的藤萝，盘曲lín xún（）的枝干就是一幅好画。

②这些闪电的影子，活像一条条火蛇，在大海里wān yán（）游动，一晃就消失了。

③“jū gōng jìn cuì（），死而后已”正好准确地描述了他的一生。

④希望你能够客观的分析前因后果，作为借鉴，以免chóng dǎo fù zhé（）3．下列句子中加点词语的运用，不正确的一项是（）（3分）A．少小离家老大回，看到家乡如今田园荒芜．．，我心里隐隐作痛。

2018年从化市初中毕业生综合测试（数学）参考答案及评分标准说明：1．本解答给出了一种解法供参考，如果考生的解法与本解答不同，各学校可根据试题的主要考查内容比照评分标准制订相应的评分细则．2．对解答题中的计算题，当考生的解答在某一步出现错误时，如果后继部分的解答未改变该题的内容和难度，可视影响的程度决定后继部分的得分，但所给分数不得超过该部分正确解答应得分数的一半；如果后继部分的解答有较严重的错误，就不再给分．3．解答右端所注分数，表示考生正确做到这一步应得的累加分数．4．只给整数分数，选择题和填空题不给中间分．二、填空题：（本大题查基本知识和基本运算，体现选择性．共6小题，每小题3分，共18分）11、a(x+1)(x ―1) 12、1=x 13、7.5 14、15 15、0115 16、x< 0或x>3三、解答题：（本大题共9小题，满分118分．解答须写出文字说明、证明过程和演算步骤．） 17、(本小题满分9分)解：原式=11x 22-⋅+x x x …………………………………………………………………3分 =)1)(1(1x 2+-⋅+x x x x ………………………………………………………………6分 =1-x x…………………………………………………………………9分18、(本小题满分10分)解：证明： 因为四边形ABCD 是正方形 ∴ AB BC = ··············································································· 2分 CBD ABD ∠=∠ ··································································· 4分 又 BE 是公共边 ············································································ 6分 ∴ABE CBE △≌△ ········································································· 8分 ∴ AE CE = ··············································································· 10分19、(本小题满分10分)解：依题意，知CD=AE=1米,DE=6米…………………………………………………………2分∵tan ∠BDE=DEBE…………………………………………………………………4分 ∴BE= DEtan ∠BDE=6tan 57.°…………………………………………………………… 6分 ∴ AB=AE+BE=6tan57°+1…………………………………………………………………8分≈10.24 …………………………………………………………………10分20、(本小题满分10分)解：（1）立定跳远距离的极差20517431(cm)=-=． …………………………………2分立定跳远距离的中位数199197198(cm)2+==． …………………………………4分 （2）根据计分标准，这10名女生的跳远距离得分分值分别是：7，9，10，10，10，8，10，10，9．所以立定跳远得分的众数是10（分），………………………………………………6分 立定跳远得分的平均数是9.3（分）．………………………………………………8分 （3）因为10名女生中有6名得满分，所以估计200名女生中得满分的人数是620012010⨯=（人）．…10分21、(本小题满分12分)解：证明：(1)∵AD ∥BC ，AB=DC,∠B=60°∴∠DCB ＝∠B ＝60° ……………………………………………………………1分 ∠DAC ＝∠ACB ……………………………………………………………2分 又∵AD=DC ∴∠DAC ＝∠DCA ………………………………………………………………3分 ∴∠DCA=∠ACB ＝0060302＝……………………………………………………5分∴∠B+∠ACB ＝90°∴AB ⊥AC ……………………………………………………………6分 （2）过点A 作AE ⊥BC 于E ………………………………7分 ∵∠B ＝60°∴∠BAE ＝30° …………………………………………8分 又∵AB=DC ＝6 ∴BE=3∴AE =……………………10分∵∠ACB ＝30°，AB ⊥AC∴BC=2AB=12 ……………………………………11分∴11()(612)22S AD BC AE +⋅=+⋅=梯＝…………12分22、(本小题满分13分)解：（1）如图，画出△AO 1B 1； ………………2分B 1（4，2），O 1（4，4）； ···················· 4分（2）设所求抛物线对应的函数关系式为y =a （x -m ）2+n ， (5)由AO 1∥x 轴，得 m =2． ………………6分 ∴y =a （x -2）2+n ．∵抛物线经过点A 、B ，∴44160.a n a n +=⎧⎨+=⎩，·················································································· 8分解得1316.3a n ⎧=-⎪⎪⎨⎪=⎪⎩， ······················································································ 10分∴所求抛物线对应的函数关系式为2116(2)33y x =--+，即214433y x x =-++ ．············································································ 11分所画抛物线图象如图所示． ······································································· 13分23、(本小题满分12分) 解：证明：(1) ∵AB 为直径∴∠ADB=∠CDB=90°……………………………1分 ∴∠ABC=∠CDB=90°……………………………2分 又 ∵∠C=∠C∴△ABC ∽△BCD …………………………4分 （2）DE 与半圆O 相切 …………………………5分连接OD ∵OD=OB∴∠ODB=∠OBD∵E 为Rt △BCD 的斜边BC 的中点 ∴CE=BD=DE ∴∠EDB=∠EBD∵∠OBD+∠EBD=90° ∴∠ODB+∠EDB=90°∴DE 与半圆O 相切 …………………………12分24、(本小题满分12分) 解：（1）设职工的月基本保障工资为x 元，销售每件产品的奖励金额为y 元 ··············· 1分由题意得20018001801700x y x y +=⎧⎨+=⎩ ······································································· 5分解这个方程组得8005x y =⎧⎨=⎩·········································································· 7分答：职工月基本保障工资为800元，销售每件产品的奖励金额5元. ························· 8分（2）设该公司职工丙六月份生产z 件产品 ··························································· 9分由题意得80052000z +≥ ······································································ 10分 解这个不等式得240z ≥ ········································································ 11分 答：该公司职工丙六月至少生产240件产品 ························································ 12分∴ AM AN AB AC =，即43x AN =． ∴ AN ＝43x ． ……………………………………………………………2分 ∴ S =2133248MNP AMN S S x x x ∆∆==⋅⋅=．（0＜x ＜4） ……………………4分 （2）如图2，设直线BC 与⊙O 相切于点D ，连结AO ，OD ，则AO =OD =21MN ．在Rt △ABC 中，BC ． 由（1）知 △AMN ∽ △ABC ．∴ AM MN AB BC =，即45x MN =． ∴ 54MN x=， ∴58OD x=． ……………………………………………………………6分 过M 点作MQ ⊥BC 于Q ，则58MQ OD x==． 在Rt△BM Q 与Rt△BCA 中，∠B 是公共角，∴ △BMQ ∽△BCA ．∴BM QMBC AC =． ∴ 55258324xBM x ⨯==，即25424AB BM MA x x =+=+=．∴ x ＝4996．∴ 当x ＝4996时，⊙O 与直线B C 相切．…………………………………………8分（3）随点M 的运动，当P 点落在直线BC 上时，连结AP ，则O 点为AP 的中点． ∵ MN ∥BC ，∴ ∠AMN =∠B ，∠AOM ＝∠APC ． ∴ △AMO ∽ △ABP ．∴ 12AM AO AB AP ==． AM ＝MB ＝2． 故以下分两种情况讨论： ① 当0＜x ≤2时，2Δ83x S y PMN==．∴ 当x ＝2时，2332.82y =⨯=最大…………………………………………10分② 当2＜x ＜4时，设PM ，PN 分别交BC 于E ，F ． ∵ 四边形AMPN 是矩形， ∴ PN ∥AM ，PN ＝AM ＝x ． 又∵ MN ∥BC ，∴ 四边形MBFN 是平行四边形．B图1D 图 2 Q 图 3∴ F N ＝BM ＝4－x ． ∴()424PF x x x =--=-．又△PEF ∽ △ACB ．∴ 2PEF ABC S PF AB S ∆∆⎛⎫= ⎪⎝⎭．∴ ()2322PEF S x ∆=-． ………………………………………… 11分MNP PEF y S S ∆∆=-＝()222339266828x x x x --=-+-．……………………12分当2＜x ＜4时，29668y x x =-+-298283x ⎛⎫=--+ ⎪⎝⎭．∴ 当83x =时，满足2＜x ＜4，2y =最大． 综上所述，当83x =时，y 值最大，最大值是2． ……………………………14分。