2018-2019年武汉市七一中学九年级起点考试卷(无答案)
武汉市七一中学九年级起点考试卷(无答案)

武汉市七一中学九年级起点考试卷(无答案)二、选择填空26. —Do you think I could borrow your dictionary?—__________.A. Yes, you may borrowB. Yes, you couldC. Yes, go onD. Yes, help yourself27. —How is everything going?—__________.A. Everything is finishedB. Nothing has been doneC. Not so bad, you knowD. Not doing wrong, you see28. —I had a really good weekend at my uncle’s.—__________.A. Oh, I’m glad to hear thatB. CongratulationsC. It’s a pleasureD. Oh, that’s very nice of you29. —How do you learn English so well?—_______chatting with my uncle in America on line.A. ForB. ByC. InD. With30. —Don’t _________me. I need some time to think about it?—All right. I’ll wait until you make a decision.A. punishB. rushC. leadD. warn31. He is very open and _________. If he knows something, he will tell us.A. patientB. commonC. politeD. direct32. —Tom,I heard that you moved to a new place.—Right, I now live next to a supermarket. It’s very _______.A. safeB. suddenC. convenientD. central33. While a person is asleep, a part of his brain is still _______.A. activeB. aliveC. awakeD. afraid34. He caught the thief by himself on the bus. All of us _______ him for his courage.A. enjoyedB. imaginedC. admiredD. warned35. —Who is the girl standing over there?—Well, if you _______know, her name is Joe.A. mayB. mustC. canD. shall36. —I don’t want to tell you about it.—Believe me. I won’t let out the _______.A. dayB. influenceC. secretD. duty37. The doctor _______her for a broken arm.A. tiedB. punishedC. treatedD. discovered38. Don’t always _______ a dictionary if you meet some new words.A. look upB. depend onC. put onD. look after39. —Which pen do you like, the red one or the blue one?—I think I won’t choose _______ of them. In fact, I like the black one.A. eitherB. neitherC. bothD. all40. —Could you tell me _______?—Of course.A. where’s there a good place to eatB. where there’s a good place to eatC. where is a good place to eatD. where a good place to eat三、完形填空If you have ever been discouraged because of failure, please read on.For often, 41 what you set out to do is not the important thing. Let me explain.Two brothers decided to dig a deep hole behind their house. As they were working, several older boys stopped by to 42 .〝What are you doing?〞asked one of the visitors.〝We plan to dig a hole all the way through the earth!〞one of the brothers 43 excitedly.The older boys began to laugh, telling the younger ones that digging a hole all the way through the earth was 44 .After a long 45 one of the diggers picked up a jar full of spiders,worms and some other kinds of insects. He removed the lid and showed the 46 things in it to the scoffing visitors.Then he said quietly and 47 〝Even if we don’t dig all the way through the earth, look at what we found along the way!〞Their goal was far too ambitious, but it did cause them to dig. And that is what a goal is for-to cause us to move in the 48 we have chosen; in other words, to 49 us digging!But not every goal will be fully achieved. Not every job will 50 successfully. Not every relationship will endure. Not every love will 51 . Not every dream will be 52 .But 53 you fall short of your aim, perhaps you can say, 〝Yes, but look at what I found along the way! Look at the wonderful things which have 54 my life because I tried to do something〞It is in the digging that life is lived. And I believe it is joy in the journey, in the end, that truly 55 .41. A. achieving B. knowing C. receiving D. finding42. A. help B. laugh C. watch D. visit43. A. cried B. explained C. added D. joked44. A. impossible B. imaginary C. secret D. surprising45. A. argument B. laugh C. talk D. silence46. A. terrible B. wonderful C. interesting D. awful47. A. slowly B. quickly C. hurriedly D. confidently48. A. instruction B. direction C. road D. choice49. A. make B. let C. set D. push50. A. end B. begin C. do D. realize51. A. meet B. own C. last D. keep52. A. completed B. realized C. started D. finished53. A. when B. before C. unless D. because54. A. come by B. come out C. come into D. come along55. A. minds B. shows C. appears D. matters四、阅读了解A56. The above reading is more probably ____________________.A. a posterB. a book reportC. a rain check for a book saleD. a ticket for a big sale57. It’s clear that the 36th book sale begins on ___________________.A. October 5, 2021B. October 4, 2021C. January 31, 2021D. February 1. 202158. If you want to get some cheapest books, you’d better get to the Needham Public Library___________.A. at 9:00 am on Oct. 4B. before 4:00 pm on Oct. 4C. at 9:00 am on Oct. 5D. between 1:00 and 4:00 pm on Oct. 559. The reading tells us at 2:00 pm on Oct. 5 you need to pay only _______ for a book with a hard cover.A. 50 centsB. 25 centsC. 1 dollarD. 8 dollars60. Which of the following is the best way to get some information for the next book sale?A. To visit the ongoing book sale when the library is openB. To telephone the manager of the libraryC. To send an e-mail to booksales @needhamlibrary. org.D. To mark you calendars right now.BShe turned up at the doorstep of my house in Cornwall. No way could I have sent her away. No way, not me anyway. Maybe someone had kicked her out of their car the night before. "We're moving house." "No space for her any more with the baby coming." "We never really wanted her, but what could we have done? She was a present." People find all sorts of excuses for abandoning an animal. And she was one of the most beautiful dogs I had ever seen.I called her Goldie. If I had known what was going to happen I would have given her a more creative name. She was so unsettled during those first few days. She hardly ate anything and had such an air of sadness about her. There was nothing I could do to make her happy, it seemed. Heaven knows what had happened to her at her previous owner's. But eventually at the end of the first week she calmed down. Always by my side, whether we were out on one of our long walks or sitting by the fire.That's why it was such a shock when she pulled away from me one day when we were out for a walk. We were a long way from home, when she started barking and getting very restless. Eventually I couldn't hold her any longer and she raced off down the road towards a farmhouse in the distance as fast as shecould.By the time I reached the farm I was very tired and upset with Goldie. But when I saw her licking (舔) the four puppies (幼犬) I started to feel sympathy towards them. "We didn't know what had happened to her," said the woman at the door. "I took her for a walk one day, soon after the puppies were born, and she just disappeared." "She must have tried to come back to them and got lost," added a boy from behind her.I must admit I do miss Goldie, but I've got Nugget now, and she looks just like her mother. And I've learnt a good lesson: not to judge people.61. How did the author feel about Goldie when Goldie came to the house?A. Shocked.B. Sympathetic.C. Annoyed.D. Upset.62. In her first few days at the author's house, Goldie________.A. felt worriedB. was angryC. ate a littleD. sat by the fire63. Goldie rushed off to a farmhouse one day because she ________.A. saw her puppiesB. heard familiar barkingsC. wanted to leave the author.D. found her way to her old home64. What is the closest meaning of the word "restless"?A. without restB. unable to stay still.C. boreD. excited65. Which is the best title of the passage?A. The Way Back HomeB. A Lovely DogC. Goldie's SecretD. Love AnimalsCIt was my very first teaching job, I worked with a group of four-year-olds. The first day went really well: Kelly only fell over twice. After several days of carrying her to and from the yard, I thought, why not encourage her to walk down the hallway a little by herself? I asked Kelly if she would like to try it, and she became very excited. The next day Kelly began her first journey down the hallway, about ten feet away. We were both excited! But my assistants were against that I was encouraging this poor child to walk. But Kelly wanted to do her best.And so we began to practice walking down the hall. I was quite nervous at first, but she just smiled and told me not to worry, she was perfectly fine. Each day Kelly and I continued our slow walk down the hallway. Weeks passed and Kelly continued to walk out to the yard every day. We hardly ever carried her.One day in December, I was told Kelly was in hospital getting her checkup. On Monday morning, when her mom brought her back to school, she asked if I had been doing anything differently with Kelly.I wasn’t quite sure what she meant.〝Her legs have got more exercise in the past few months than in the past four years of her life.〞she looked at me with tears in her eyes and told me that Kelly’s bad legs became much better.〝I don’t know how to thank you for everything you have done for my daughter.〞Seventeen years later, I still think back to the first time Kelly made it down the long hallway. She taught me that no obstacle(阻碍) in life is too big to overcome. You just need to keep working at it---one step at a time.66. Why did the writer want to teach Kelly to walk?A. Because she wanted Kelly to walk by herself later on.B. Because she thought Kelly was too much trouble to her.C. Because Kelly was as healthy as any other kids.D. Because Kelly hoped to get into another classroom down the hallway.67. What did you think of Kelly in the walking?A. She couldn't learn a good way to walk.B. She liked doing something difficult.C. She was good at asking for others’ help.D. She could hold on to something she was doing.68. Kelly’s mother asked if I had been doing anything differently with Kelly, she really meant that .A. the teacher shouldn't make her daughter walk so far without permission.B. the teacher should be fair to her daughter as other kids.C. it was the teacher's training that helped her daughter's legs get better.D. it was not good for the teacher to do something differently to her daughter.69. We can infer from the last paragraph that .A. Kelly became a teacher like the writer.B. the teacher could face any difficulties in her life.C. Kelly will always remember the teacher.D. the teacher would be in great trouble in the future.70. Which of the following is true?A. Kelly was a disabled girl.B. The mother didn’t care much about her daughter.C.The assistants were in agreement with the writer.D. The teacher found it hard to teacher Kelly.五、词与短语选择填空。
湖北省武汉市武昌七校2018_2019学年度第一学期九年级10月份联合测试数学试卷(答案不全)

湖北省武汉市武昌七校2018~2019学年度第一学期九年级10月份联合测试数学试卷武昌区七校联考:武大外校,华一寄宿,水一,水二,南湖中学,武汉中学,华科附中一、选择题(共10小题,每小题3分,共30分)1.(3分)下列汉字中,属于中心对称图形的是( D )A.B.C.D.2.二次函数y=x2-2x+2的顶点坐标是( A )A.(1,1) B.(2,2) C.(1,2) D.(1,3)3.(3分)如图,在△ABC中,∠CAB=70°.在同一平面内,将△ABC绕点A旋转到△AB′C′的位置,使得CC′∥AB,则∠BAB′=( C )A.30°B.35°C.40°D.50°4.用配方法解方程x2+6x+4=0,下列变形正确的是( C )A.(x+3)2=-4 B.(x-3)2=4 C.(x+3)2=5 D.(x +3)2=55.下列方程中没有实数根的是( D )A.x2-x-1=0 B.x2+3x+2=0 C.2015x2+11x-20=0 D.x2+x+2=06.(3分)如图,将△ABC绕点C(0,﹣1)旋转180°得到△A'B'C,设点A 的坐标为(a,b),则点A′的坐标为( D )A.(﹣a,﹣b) B.(﹣a.﹣b﹣1)C.(﹣a,﹣b+1)D.(﹣a,﹣b﹣2)7.(3分)如图,抛物线y=x2+bx+c与x轴交于A、B两点,与y轴交于点C,且∠OBC=45°,则下列各式成立的是( D )A.b﹣c﹣1=0 B.b+c﹣1=0 C.b﹣c+1=0 D.b+c+1=0 8.已知抛物线C的解析式为y=ax2+bx+c,则下列说法中错误的是( C )A.a确定抛物线的形状与开口方向B.若将抛物线C沿y轴平移,则a,b的值不变C.若将抛物线C沿x轴平移,则a的值不变D.若将抛物线C沿直线l:y=x+2平移,则a、b、c的值全变9.如图2,四边形ABCD的两条对角线互相垂直,AC+BD=16,则四边形ABCD 的面积最大值是( D )A.64 B.16 C.24 D.3210.已知二次函数的解析式为y=ax2+bx+c(a、b、c为常数,a≠0),且a2+ab+ac<0,下列说法:①b2-4ac<0;②ab+ac<0;③方程ax2+bx+c=0有两个不同根x1、x2,且(x1-1)(1-x2)>0;④二次函数的图象与坐标轴有三个不同交点,其中正确的个数是( C )A.1 B.2 C.3 D.4二、填空题(共6小题,每小题3分,共18分)11.方程x2=2x的根是_x1=0 x2=2_______12.(3分)⊙O的半径为13cm,AB,CD是⊙O的两条弦,AB∥CD,AB=24cm,CD=10cm.则AB和CD之间的距离7cm或17cm..13.(3分)已知a,b是方程 x2+2x=2的两个实数根,则+= 1..14.(3分)如图,⊙O的直径AB长为10,弦AC的长为6,∠ACB的角平分线交⊙O于D,则CD长为 7..15.(3分)设a为实数,若方程|(x+3)(x+1)|=x+a有且仅有三个实数根,则a的值为 3或..16.(3分)如图三角形ABC中,AB=3,AC=4,以BC为边向三角形外作等边三角形BCD,连AD,则当∠BAC= 120 度时,AD有最大值 7 .三、解答题(共8小题,共72分)17.(8分)解方程:x2﹣2x=8.解:方程整理得:x2﹣2x﹣8=0,因式分解得:(x﹣4)(x+2)=0,解得:x1=4,x2=﹣2.18.(8分).已知抛物线y=x2+bx+c的对称轴为x=2,且过点C(0,3)(1)求此抛物线的解析式;(2)证明:该抛物线恒在直线y=﹣2x+1上方.解:(1)∵抛物线y=x2+bx+c的对称轴为x=2,∴﹣=2,得,b=﹣4,∵抛物线y=x2+bx+c过点C(0,3),∴c=3,∴此抛物线的解析式为:y=x2﹣4x+3;(2)证明:设y1=x2﹣4x+3,y2=﹣2x+1,则y1﹣y2=(x2﹣4x+3)﹣(﹣2x+1)=x2﹣2x+2=(x﹣1)2+1>0,∴y 1>y 2,∴该抛物线恒在直线y=﹣2x+1上方.19.(本题8分)已知x 1、x 2是方程x 2-3x -5=0的两实数根(1) 求x 1+x 2,x 1x 2的值(2) 求2x 12+6x 2-2015的值20如图②是4×4网格,每个小正方形的边长都为1,请用图案①作为基本图案,通过平移,轴对称,旋转变换,设计两个不同..的精美图案,使它们满足:①既是轴对称图形,又是中心对称图形;②所作图案用阴影标识,且阴影部分面积为4。
(解析版)2018-2019年武汉七第一中学学初三上抽考数学试卷.doc

(解析版)2018-2019年武汉七第一中学学初三上抽考数学试卷【一】选择题〔共有10个小题,每题3分〕1、使以下二次根式有意义的取值范围为X≥3的是〔〕A、B、C、D、2、以下计算正确的选项是〔〕A、+=B、﹣=C、=D、3、一元二次方程X2﹣4X+4=0的根的情况是〔〕A、有两个不相等的实数根B、有一个实数根C、有两个相等的实数根D、没有实数根4、如图,四边形纸片ABCD关于直线EF对称,∠BAD=50°,∠B=30°,那么∠BCD的度数是〔〕A、70°B、80°C、110°D、130°5、设一元二次方程X2﹣2X﹣4=0的两个实数为X1和X2,那么以下结论正确的选项是〔〕A、X1+X2=2B、X1+X2=﹣4C、X1X2=﹣2D、X1X2=46、点P〔2,3〕关于原点对称的点的坐标是〔〕A、〔2,﹣3〕B、〔﹣2,3〕C、〔﹣2,﹣3〕D、〔2,3〕7、关于X的方程KX2+3X﹣1=0有实数根,那么K的取值范围是〔〕A、K≤B、K≥﹣且K≠0C、K≥﹣D、K》﹣且K≠08、如图,梯形ABCD中,AD∥BC,AB=CD=AD,AC,BD相交于O点,∠BCD=60°,那么以下说法错误的选项是〔〕A、梯形ABCD是轴对称图形B、BC=2ADC、梯形ABCD是中心对称图形D、AC平分∠DCB9、某市为调查学生的视力变化情况,从全市九年级学生中抽取了部分学生,统计了每个人连续三年视力:根据图中信息,以下判断:①该市08年共抽取了2000名九年级学生视力进行调查;②假设该市08年共有8万九年级学生,估计该市九年级视力不良〔4、9以下〕的学生大约有3200人;③在被调查的学生中2007年视力在4、9以下的人数增长率低于2017年的人数增长率;④假设按06年到08年该市九年级视力不良〔4、9以下〕的学生人数的平均增长率计算,那么估计到09年该市视力不良〔4、9以下〕的学生将不低于有52000人;以上结论正确的选项是〔〕A、②③④B、①③④C、①②④D、①④10、如图,边长为5的等边三角形ABC纸片,点E在AC边上,点F在AB边上,沿着EF折叠,使点A落在BC边上的点D的位置,且ED⊥BC,那么CE的长是〔〕A、10﹣15B、10﹣5C、5﹣5D、20﹣10【二】填空题〔共6题,每题3分,共18分〕11、化简=、12、太空探测器“先驱者10号”从发射到2003年2月人们收到它最后一次发回的信号时,它已飞离地球12200000000KM,用科学记数法表示这个距离为KM、13、某药品原价每盒25元,为了响应国家解决老百姓看病贵的号召,经过连续两次降价,现在售价每盒16元,那么该药品平均每次降价的百分率是、14、一列快车从甲地驶往乙地,一列慢车从乙地驶往甲地,两车同时出发,两车的距离Y 〔千米〕与慢车行驶的时间X〔小时〕之间的函数关系如下图,那么快车的速度为、15、如图,直线Y=X+2与坐标轴交于A、B两点,与双曲线Y=交于点C,A、D关于Y 轴对称,假设S四边形OBCD=6,那么K=、16、如图,四边形ABCD,∠BAD=90°,AB=BC=10,AD=5,AC=12,那么CD=、【三】解答题17、解方程:X2﹣3X﹣2=0、18、X=﹣1,求X2﹣4X+6的值、19、如图,点B、F、C、E在同一直线上,AB=DE,AB∥ED、AC∥FD求证:AC=DF、20、一次函数Y=AX+B的图象与反比例函数Y=的图象交于A〔2,2〕,B〔﹣1,M〕;〔1〕求一次函数的解析式;〔2〕直接写出AX+B中X的取值范围、21、如图,方格纸中的每个小方格都是边长为1的正方形,我们把以格点间连线为边的三角形称为“格点三角形”,图中的△ABC是格点三角形,在建立平面直角坐标系后,点B的坐标为〔﹣1,﹣1〕、〔1〕把△ABC向右平移3格后得到△A1B1C1,画出△A1B1C1的图形并写出点B1的坐标;〔2〕把△ABC绕点B按顺时针方向旋转90°后得到△A2B2C2,画出△A2B2C2的图形并写出点B2的坐标;〔3〕直接写出C到AB的距离、22、关于X的方程〔1〕假设方程有两个相等的实数根,求M的值,并求出此时方程的根;〔2〕是否存在正数M,使方程的两个实数根的平方和等于224、假设存在,求出满足条件的M的值;假设不存在,请说明理由、23、我市宣化素有“葡萄之乡”著称,某葡萄园有100株葡萄秧,每株平均产量为40千克,现准备多种一些以提高产量,但是如果多种葡萄秧,那么每株之间的距离和每株葡萄秧接受的阳光就会减少,根据实践经验,增加的株数与每株葡萄秧的产量之间的关系如下表所示:增加的株数X〔株〕…10 15 20 22 …每株葡萄秧的产量Y〔千克〕…37、5 36、25 35 34、5 …〔1〕请你用所学过的只是确定一个Y与X之间的函数关系式;〔2〕在〔1〕的条件下,求葡萄园的总产量P与X的函数关系式、24、如图1,正方形ABCD中,对角线AC、BD交于O点,点F为边CD上一点,AE⊥AF交CB延长线于E、〔1〕求证:AE=AF;〔2〕如图2,M、N分别为AE、BC的中点,连接MN、DE,交于点Q,试判断QN和QE数量关系,并证明你的结论;〔3〕如图3,连接EF交BD于H,连DE,假设AB=8,BH=3,那么DE=、25、如图,一次函数Y=AX+B与反比例函数Y=〔X》0〕的图象交于点A、B,与X、Y 轴交于C、D,且满足+〔A+〕2=0、〔1〕求反比例函数解析式;〔2〕当AB=BC时,求B的值;〔3〕如图2,当B=2时,连OA,将OA绕点O逆时针旋转60°,使点A与点P重合,以点P为顶点作∠MPN=60°,分别交直线AB和X轴于点M、N,求证:PM平分∠AMN、2018-2018学年湖北省武汉市七一中学九年级〔上〕月考数学试卷〔9月份〕参考答案与试题解析【一】选择题〔共有10个小题,每题3分〕1、使以下二次根式有意义的取值范围为X≥3的是〔〕A、B、C、D、考点:二次根式有意义的条件、分析:根据二次根式和分式有意义的条件:被开方数大于等于0,分式的分母不能为0,针对四个选项进行分析即可、解答:解:A、X﹣3≥0,解得:X≥3,故此选项正确;B、X+3≥0,解得:X≥﹣3,故此选项错误;C、X+3》0,解得:X》﹣3,故此选项错误;D、X﹣3》0,解得:X》3,故此选项错误;应选:A、点评:此题主要考查了二次根式和分式有意义的条件,二次根式的被开方数是非负数、分式的分母不能等于0、2、以下计算正确的选项是〔〕A、+=B、﹣=C、=D、考点:二次根式的混合运算、专题:计算题、分析:A、利用同类二次根式的定义即可判定;B、利用同类二次根式的定义即可判定;C、利用二次根式的除法法那么计算即可判定;D、利用二次根式的除法法那么计算即可判定、解答:解:A、+=+2≠,应选项错误;B、﹣=﹣2,应选项错误;C、=,应选项正确;D、,应选项错误、应选C、点评:此题主要考查了二次根式的混合运算,熟练化简二次根式后,在加减的过程中,有同类二次根式的要合并;相乘的时候,被开方数简单的直接让被开方数相乘,再化简;较大的也可先化简,再相乘,灵活对待、3、一元二次方程X2﹣4X+4=0的根的情况是〔〕A、有两个不相等的实数根B、有一个实数根C、有两个相等的实数根D、没有实数根考点:根的判别式、分析:要判断方程X2﹣4X+4=0的根的情况就要求出方程的根的判别式,然后根据判别式的正负情况即可作出判断、解答:解:∵A=1,B=﹣4,C=4,∴△=16﹣16=0,∴方程有两个相等的实数根、应选C、点评:总结:一元二次方程根的情况与判别式△的关系:〔1〕△》0⇔方程有两个不相等的实数根;〔2〕△=0⇔方程有两个相等的实数根;〔3〕△《0⇔方程没有实数根、4、如图,四边形纸片ABCD关于直线EF对称,∠BAD=50°,∠B=30°,那么∠BCD的度数是〔〕A、70°B、80°C、110°D、130°考点:轴对称的性质、分析:根据轴对称的性质可知、解答:解:依题意有∠BAC=∠DEC=0、5∠BAD=25°,∠B=30°,故∠BCF=55°,那么∠BCD的度数是∠BCF的2倍,故∠BCD=110°、应选C、点评:此题考查轴对称的性质,对应点的连线与对称轴的位置关系是互相垂直,对应点所连的线段被对称轴垂直平分,对称轴上的任何一点到两个对应点之间的距离相等、5、设一元二次方程X2﹣2X﹣4=0的两个实数为X1和X2,那么以下结论正确的选项是〔〕A、X1+X2=2B、X1+X2=﹣4C、X1X2=﹣2D、X1X2=4考点:根与系数的关系、分析:根据一元二次方程根与系数的关系求那么可、设X1,X2是关于X的一元二次方程AX2+BX+C=0〔A≠0,A,B,C为常数〕的两个实数根,那么X1+X2=,X1X2=、解答:解:这里A=1,B=﹣2,C=﹣4,根据根与系数的关系可知:X1+X2=﹣=2,X1•X2==﹣4,应选A点评:此题考查了一元二次方程根与系数的关系、6、点P〔2,3〕关于原点对称的点的坐标是〔〕A、〔2,﹣3〕B、〔﹣2,3〕C、〔﹣2,﹣3〕D、〔2,3〕考点:关于原点对称的点的坐标、分析:此题比较容易,考查平面直角坐标系中两个关于坐标轴成轴对称的点的坐标特点、解答:解:根据“关于原点对称的点,横坐标与纵坐标都互为相反数”可知:点P〔2,3〕关于原点对称的点的坐标是〔﹣2,﹣3〕、应选C、点评:解决此题的关键是掌握好对称点的坐标规律:〔1〕关于X轴对称的点,横坐标相同,纵坐标互为相反数;〔2〕关于Y轴对称的点,纵坐标相同,横坐标互为相反数;〔3〕关于原点对称的点,横坐标与纵坐标都互为相反数、7、关于X的方程KX2+3X﹣1=0有实数根,那么K的取值范围是〔〕A、K≤B、K≥﹣且K≠0C、K≥﹣D、K》﹣且K≠0考点:根的判别式、分析:关于X的方程可以是一元一次方程,也可以是一元二次方程;当方程为一元一次方程时,K=0;是一元二次方程时,必须满足以下条件:〔1〕二次项系数不为零;〔2〕在有实数根下必须满足△=B2﹣4AC≥0、解答:解:当K=0时,方程为3X﹣1=0,有实数根,当K≠0时,△=B2﹣4AC=32﹣4×K×〔﹣1〕=9+4K≥0,解得K≥﹣、综上可知,当K≥﹣时,方程有实数根;应选C、点评:此题考查了方程有实数根的含义,一元二次方程根的判别式的应用、切记不要忽略一元二次方程二次项系数不为零这一隐含条件、注意到分两种情况讨论是解题的关键、8、如图,梯形ABCD中,AD∥BC,AB=CD=AD,AC,BD相交于O点,∠BCD=60°,那么以下说法错误的选项是〔〕A、梯形ABCD是轴对称图形B、BC=2ADC、梯形ABCD是中心对称图形D、AC平分∠DCB考点:梯形、专题:压轴题、分析:利用条件,对四个选逐个验证,即可得到答案、解答:解:A、根据条件AB=CD,那么该梯形是等腰梯形,等腰梯形是轴对称图形,正确;B、过点D作DE∥AB交BC于点E,得到平行四边形ABED和等边三角形CDE、所以BC=2AD,正确;C、根据中心对称图形的概念,等腰梯形一定不是中心对称图形,错误;D、根据等边对等角和平行线的性质,可得AC平分∠BCD,正确、应选C、点评:要熟悉这个上底和腰相等且底角是60°的等腰梯形的性质;理解轴对称图形和中心对称图形的概念、9、某市为调查学生的视力变化情况,从全市九年级学生中抽取了部分学生,统计了每个人连续三年视力:根据图中信息,以下判断:①该市08年共抽取了2000名九年级学生视力进行调查;②假设该市08年共有8万九年级学生,估计该市九年级视力不良〔4、9以下〕的学生大约有3200人;③在被调查的学生中2007年视力在4、9以下的人数增长率低于2017年的人数增长率;④假设按06年到08年该市九年级视力不良〔4、9以下〕的学生人数的平均增长率计算,那么估计到09年该市视力不良〔4、9以下〕的学生将不低于有52000人;以上结论正确的选项是〔〕A、②③④B、①③④C、①②④D、①④考点:折线统计图;用样本估计总体;扇形统计图、分析:根据折线统计图合扇形统计图所提供的数据,分别计算出08年共抽取的学生数以及各年份的增长率,再与给出的数据进行比较,即可得出正确答案、解答:解:①该市08年共抽取的九年级学生视力调查的总人数是:800÷40%=2000〔人〕,故本选项正确;②该市九年级视力不良〔4、9以下〕的学生大约总人数是:80000×40%=32000〔人〕,故本选项错误;③2007年视力在4、9以下的人数增长率为:×100%=66、67%,2017年的人数增长率为×100%=60%,故本选项错误;④设06年到08年该市九年级视力不良〔4、9以下〕的学生人数的平均增长率为X,根据题意得;300×〔1+X〕2=800,解得;X1=﹣1,X2=﹣﹣1〔舍去〕,那么09年该市视力不良〔4、9以下〕的学生是:800×40%≈52267〔人〕,将不低于有52000人,故本选项正确、应选D、点评:此题考查的是折线统计图和扇形统计图的综合运用、读懂统计图,从不同的统计图中得到必要的信息是解决问题的关键、10、如图,边长为5的等边三角形ABC纸片,点E在AC边上,点F在AB边上,沿着EF折叠,使点A落在BC边上的点D的位置,且ED⊥BC,那么CE的长是〔〕A、10﹣15B、10﹣5C、5﹣5D、20﹣10考点:等边三角形的性质;勾股定理、专题:综合题;压轴题、分析:根据轴对称的性质可得AE=ED,在RT△EDC中,利用60度角求得ED=EC,列出方程EC+ED=〔1+〕EC=5,解方程即可求解、解答:解:∵AE=ED在RT△EDC中,∠C=60°,ED⊥BC∴ED=EC∴CE+ED=〔1+〕EC=5∴CE=20﹣10、应选D、点评:此题考查等边三角形的性质,其三边相等,三个内角相等,均为60度、【二】填空题〔共6题,每题3分,共18分〕11、化简=、考点:二次根式的性质与化简、专题:计算题、分析:根据二次根式的意义直接化简即可、解答:解:==3、故答案为:3、点评:此题考查二次根式的化简,需注意被开方数不含能开的尽方的因数、12、太空探测器“先驱者10号”从发射到2003年2月人们收到它最后一次发回的信号时,它已飞离地球12200000000KM,用科学记数法表示这个距离为1、22×1010KM、考点:科学记数法—表示较大的数、专题:应用题、分析:科学记数法的表示形式为A×10N的形式,其中1≤|A|《10,N为整数、确定N 的值时,要看把原数变成A时,小数点移动了多少位,N的绝对值与小数点移动的位数相同、当原数绝对值大于1时,N是正数;当原数的绝对值小于1时,N是负数、解答:解:12200000000=1、22×1010KM、点评:把一个数M记成A×10N〔1≤|A|《10,N为整数〕的形式,这种记数的方法叫做科学记数法、〔1〕当|A|≥1时,N的值为A的整数位数减1;〔2〕当|A|《1时,N的值是第一个不是0的数字前0的个数,包括整数位上的0、13、某药品原价每盒25元,为了响应国家解决老百姓看病贵的号召,经过连续两次降价,现在售价每盒16元,那么该药品平均每次降价的百分率是20%、考点:一元二次方程的应用、专题:增长率问题、分析:设该药品平均每次降价的百分率为X,根据降价后的价格=降价前的价格〔1﹣降价的百分率〕,那么第一次降价后的价格是25〔1﹣X〕,第二次后的价格是25〔1﹣X〕2,据此即可列方程求解、解答:解:设该药品平均每次降价的百分率为X,由题意可知经过连续两次降价,现在售价每盒16元,故25〔1﹣X〕2=16,解得X=0、2或1、8〔不合题意,舍去〕,故该药品平均每次降价的百分率为20%、点评:此题考查数量平均变化率问题、原来的数量〔价格〕为A,平均每次增长或降低的百分率为X的话,经过第一次调整,就调整到A〔1±X〕,再经过第二次调整就是A〔1±X〕〔1±X〕=A〔1±X〕2、增长用“+”,下降用“﹣”、14、一列快车从甲地驶往乙地,一列慢车从乙地驶往甲地,两车同时出发,两车的距离Y 〔千米〕与慢车行驶的时间X〔小时〕之间的函数关系如下图,那么快车的速度为150KM/H、考点:一次函数的应用、分析:假设快车的速度为A〔KM/H〕,慢车的速度为B〔KM/H〕、当两车相遇时,两车各自所走的路程之和就是甲乙两地的距离,由此列式4A+4B=900①,另外,由于快车到达乙地的时间比慢车到达甲地的时间要短,图中的〔12,900〕这个点表示慢车刚到达甲地,这时的两车距离等于两地距离,而X=12就是慢车正好到达甲地的时间,所以,12B=900,①和②可以求出,快车速度、解答:解:设快车的速度为A〔KM/H〕,慢车的速度为B〔KM/H〕,∴4〔A+B〕=900,∵慢车到达甲地的时间为12小时,∴12B=900,B=75,∴4〔A+75〕=900,解得:A=150;∴快车的速度为150KM/H、故答案为:150KM/H、点评:此题主要考查了一次函数的应用,解题的关键是首先正确理解题意,然后根据题目的数量关系得出B的值、15、如图,直线Y=X+2与坐标轴交于A、B两点,与双曲线Y=交于点C,A、D关于Y 轴对称,假设S四边形OBCD=6,那么K=、考点:反比例函数与一次函数的交点问题、分析:求出A、B的坐标,求出D的坐标,求出AD、OB的值,设C的坐标是〔X,X+2〕,根据得出S△ACD﹣S△AOB=6,推出×〔4+4〕×〔X+2〕﹣×4×2=6,求出C的坐标即可、解答:解:∵Y=X+2,∴当X=0时,Y=2,当Y=0时,0=X+2,X=﹣4,即A〔﹣4,0〕,B〔0,2〕,∵A、D关于Y轴对称,∴D〔4,0〕,∵C在Y=X+2上,∴设C的坐标是〔X,X+2〕,∵S四边形OBCD=6,∴S△ACD﹣S△AOB=6,∴×〔4+4〕×〔X+2〕﹣×4×2=6,X=1,X+2=,C〔1,〕,代入Y=得:K=、故答案为:、点评:此题考查了一次函数与反比例函数的交点问题,三角形的面积等知识点,主要考查学生的计算能力,题目具有一定的代表性,是一道比较好的题目、16、如图,四边形ABCD,∠BAD=90°,AB=BC=10,AD=5,AC=12,那么CD=、考点:等腰三角形的性质;勾股定理、分析:作辅助线构建直角三角形,可得COS∠BAE=,再根据三角函数求出AF,DF的长,从而得到CF的长、根据勾股定理即可求出CD的长、解答:解:过B点作BE⊥AC于E,过D点作DF⊥AC于F,∵AB=BC=10,AC=12,∴COS∠BAE=,∵∠BAD=90°,∴SIN∠DAE=,∵AD=5,∴DF=3,∴AF=4,∴CF=12﹣4=8、∴CD==、故答案为:、点评:此题考查了解直角三角形、三角函数、勾股定理等知识、难度较大,有利于培养同学们钻研和探索问题的精神、【三】解答题17、解方程:X2﹣3X﹣2=0、考点:解一元二次方程-公式法、专题:计算题、分析:公式法的步骤:①化方程为一般形式;②找出A,B,C;③求B2﹣4AC;④代入公式X=、解答:解:∵A=1,B=﹣3,C=﹣2;∴B2﹣4AC=〔﹣3〕2﹣4×1×〔﹣2〕=9+8=17;∴X==,∴X1=,X2=、点评:此题主要考查了解一元二次方程的解法、要会熟练运用公式法求得一元二次方程的解、此法适用于任何一元二次方程、18、X=﹣1,求X2﹣4X+6的值、考点:二次根式的化简求值、专题:计算题、分析:将X的值代入计算即可求出值、解答:解:原式=〔X﹣2〕2+2,当X=﹣1时,原式=〔﹣1+2〕2+2=5+2、点评:此题考查了二次根式的化简求值,熟练掌握运算法那么是解此题的关键、19、如图,点B、F、C、E在同一直线上,AB=DE,AB∥ED、AC∥FD求证:AC=DF、考点:全等三角形的判定与性质;平行线的性质、专题:证明题、分析:由两直线平行可得,两组内错角相等,又AB=DE,那么△ABC≌△DEF〔AAS〕,那么AC=DF、解答:证明:∵AB∥ED,AC∥FD,∴∠B=∠E,∠ACB=∠DFE,又AB=DE,∴△ABC≌△DEF〔AAS〕,∴AC=DF、点评:此题考查三角形全等的判定和性质,以及平行线的性质,难度不大、20、一次函数Y=AX+B的图象与反比例函数Y=的图象交于A〔2,2〕,B〔﹣1,M〕;〔1〕求一次函数的解析式;〔2〕直接写出AX+B中X的取值范围、考点:反比例函数与一次函数的交点问题、专题:计算题、分析:〔1〕将B坐标代入反比例解析式求出M的值,确定出B坐标,将A与B坐标代入一次函数解析式求出A与B的值,即可确定出一次函数解析式;〔2〕由A与B的横坐标,以及0,将X轴分为四个范围,找出一次函数图象在反比例函数图象上方时X的范围即可、解答:解:〔1〕将B〔﹣1,M〕代入反比例解析式得:M=﹣4,即B〔﹣1,﹣4〕,将A与B坐标代入Y=AX+B中得:,解得:,那么一次函数解析式为Y=2X﹣2;〔2〕由题意得:2X﹣2》的X范围为﹣1《X《0或X》2、点评:此题考查了反比例函数与一次函数的交点问题,熟练掌握待定系数法是解此题的关键、21、如图,方格纸中的每个小方格都是边长为1的正方形,我们把以格点间连线为边的三角形称为“格点三角形”,图中的△ABC是格点三角形,在建立平面直角坐标系后,点B的坐标为〔﹣1,﹣1〕、〔1〕把△ABC向右平移3格后得到△A1B1C1,画出△A1B1C1的图形并写出点B1的坐标;〔2〕把△ABC绕点B按顺时针方向旋转90°后得到△A2B2C2,画出△A2B2C2的图形并写出点B2的坐标;〔3〕直接写出C到AB的距离3、考点:作图-旋转变换;作图-平移变换、专题:作图题、分析:〔1〕根据网格结构找出点A1、B1、C1的位置,然后顺次连接即可,再根据平面直角坐标系写出点B1的坐标;〔2〕根据网格结构找出点A2、B2、C2的位置,然后顺次连接即可,再根据平面直角坐标系写出点B2的坐标;〔3〕根据网格结构作出C到AB的垂线,再根据勾股定理列式计算即可得解、解答:解:〔1〕△A1B1C1如下图,B1〔2,﹣1〕;〔2〕△A2B2C2如下图,B2〔﹣1,﹣1〕;〔3〕点C到AB的距离为=3、故答案为:3、点评:此题考查了利用旋转变换作图,利用平移变换作图,勾股定理的应用,熟练掌握网格结构,准确找出对应点的位置是解题的关键、22、关于X的方程〔1〕假设方程有两个相等的实数根,求M的值,并求出此时方程的根;〔2〕是否存在正数M,使方程的两个实数根的平方和等于224、假设存在,求出满足条件的M的值;假设不存在,请说明理由、考点:根与系数的关系;解一元二次方程-配方法;解一元二次方程-因式分解法;根的判别式、分析:〔1〕方程有两相等的实数根,利用△=0求出M的值、化简原方程求得方程的根、〔2〕利用根与系数的关系X1+X2=﹣=4M﹣8,X1X2==4M2,X12+X22=〔X1+X2〕2﹣2X1X2,代入即可得到关于M的方程,求出M的值,再根据△来判断所求的M的值是否满足原方程、解答:解:〔1〕∵A=,B=﹣〔M﹣2〕,C=M2方程有两个相等的实数根,∴△=0,即△=B2﹣4AC=【﹣〔M﹣2〕】2﹣4××M2=﹣4M+4=0,∴M=1、原方程化为:X2+X+1=0X2+4X+4=0,〔X+2〕2=0,∴X1=X2=﹣2、〔2〕不存在正数M使方程的两个实数根的平方和等于224、∵X1+X2=﹣=4M﹣8,X1X2==4M2X12+X22=〔X1+X2〕2﹣2X1X2=〔4M﹣8〕2﹣2×4M2=8M2﹣64M+64=224,即:8M2﹣64M﹣160=0,解得:M1=10,M2=﹣2〔不合题意,舍去〕,又∵M1=10时,△=﹣4M+4=﹣36《0,此时方程无实数根,∴不存在正数M使方程的两个实数根的平方和等于224、点评:总结:〔1〕一元二次方程根的情况与判别式△的关系:〔1〕△》0⇔方程有两个不相等的实数根;〔2〕△=0⇔方程有两个相等的实数根;〔3〕△《0⇔方程没有实数根、〔4〕△≥0时,根与系数的关系为:、23、我市宣化素有“葡萄之乡”著称,某葡萄园有100株葡萄秧,每株平均产量为40千克,现准备多种一些以提高产量,但是如果多种葡萄秧,那么每株之间的距离和每株葡萄秧接受的阳光就会减少,根据实践经验,增加的株数与每株葡萄秧的产量之间的关系如下表所示:增加的株数X〔株〕…10 15 20 22 …每株葡萄秧的产量Y〔千克〕…37、5 36、25 35 34、5 …〔1〕请你用所学过的只是确定一个Y与X之间的函数关系式;〔2〕在〔1〕的条件下,求葡萄园的总产量P与X的函数关系式、考点:二次函数的应用、分析:〔1〕由表格可以看出Y随着X的增大而减少,而且从前面可以看出递减的速度是均匀的,因此此函数关系式是一次函数,设出函数解析式,进一步求得结论进行验证即可;〔2〕利用葡萄园的总产量等于每一株的产量乘所种的株数列出函数解析式、解答:解:〔1〕由题意可设Y=KX+B,把〔0,40〕〔10,37、5〕代入解析式得解得∴Y=﹣X+40;把X=22代入得Y=34、5,验证正确;〔2〕P=〔100+X〕〔﹣X+40〕=﹣X2+15X+4000、点评:此题考查利用表格中数据的变化规律确定函数,代入数值求的函数,利用基本数量关系是解决问题的关键、24、如图1,正方形ABCD中,对角线AC、BD交于O点,点F为边CD上一点,AE⊥AF交CB延长线于E、〔1〕求证:AE=AF;〔2〕如图2,M、N分别为AE、BC的中点,连接MN、DE,交于点Q,试判断QN和QE数量关系,并证明你的结论;〔3〕如图3,连接EF交BD于H,连DE,假设AB=8,BH=3,那么DE=、考点:四边形综合题、分析:〔1〕由正方形的性质得出∠BAD=∠ABC=∠ABE=∠BCD=∠ADF=90°,AB=BC =AD=CD,再由条件证出∠BAE=∠DAF,由ASA证明△ABE≌△ADF,即可得出结论;〔2〕连接OM、BM,OM交DE于F,连接NF,先证明OM是△ACE的中位线,得出OM∥BC,再证明四边形BNFM是平行四边形,得出FN=MB,由SAS证明△MEN≌△FNE,得出对应角相等∠MNE=∠FEN,即可得出结论;〔3〕由正方形的性质求出BD,得出DH,,设BM=3X,那么DF=13X,得出,作FG∥CE,交AB于G,那么,得出方程,解方程求出X,得出BE,再由勾股定理求出DE即可、解答:〔1〕证明:∵四边形ABCD是正方形,∴∠BAD=∠ABC=∠ABE=∠BCD=∠ADF=90°,AB=BC=AD=CD,∵AE⊥AF,∴∠EAF=90°,∴∠BAE=∠DAF,在△ABE和△ADF中,,∴△ABE≌△ADF〔ASA〕,∴AE=AF;〔2〕解:QN=QE;理由如下:连接OM、BM,OM交DE于F,连接NF,如图1所示:∵四边形ABCD是正方形,∴OA=OC,AD∥BC,AD=BC,∵M是AE的中点,∴OM是△ACE的中位线,∴OM∥BC,∴OM∥AD,∴EF=DF,∴MF是△ADE的中位线,∴MF=AD,∴MF=BC,∵N是BC的中点,∴BN=BC,∴MF=BN,∴四边形BNFM是平行四边形,∴FN=MB,∵∠ABE=90°,∴MB=AE=ME,∴FN=ME,即四边形MENF是等腰梯形,∴∠MEN=∠FNE,在△MEN和△FNE中,,∴△MEN≌△FNE〔SAS〕,∴∠MNE=∠FEN,∴QN=QE;〔3〕解:如图2所示:∵四边形ABCD是正方形,∴BD=AB=×8=16,AB∥CD,∴DH=BD﹣BH=13,,设BM=3X,那么DF=13X,由〔1〕得:△ABE≌△ADF,BE=DF=13X,∴,作FG∥CE,交AB于G,那么△GFM∽△BEM,∴,即,解得:X=,∴BE=5,∴CE=5+8,∴DE===、点评:此题是四边形综合题目,考查了正方形的性质、全等三角形的判定与性质、三角形中位线定理、平行四边形的判定与性质、相似三角形的判定与性质、勾股定理等知识;此题难度较大,综合性强,特别是〔2〕〔3〕中,需要通过作辅助线证明三角形全等和三角形相似才能得出结论、25、如图,一次函数Y=AX+B与反比例函数Y=〔X》0〕的图象交于点A、B,与X、Y轴交于C、D,且满足+〔A+〕2=0、〔1〕求反比例函数解析式;〔2〕当AB=BC时,求B的值;〔3〕如图2,当B=2时,连OA,将OA绕点O逆时针旋转60°,使点A与点P重合,以点P为顶点作∠MPN=60°,分别交直线AB和X轴于点M、N,求证:PM平分∠AMN、考点:反比例函数综合题;二次根式的性质与化简;反比例函数与一次函数的交点问题;全等三角形的判定与性质;等边三角形的判定与性质;相似三角形的判定与性质、专题:压轴题、分析:〔1〕由条件+〔A+〕2=0即可求出K和A,即可解决问题、〔2〕过点A作AE⊥OC,垂足为E,过点B作BF⊥OC,垂足为F,如图1,设点A〔M,〕,通过三角形相似可以用M表示出点B的坐标,将点A、B的坐标代入直线AB的解析式,就可求出M和B的值、〔3〕易证△OAC和△OAP都是等边三角形,结合∠MPN=60°可以证到△PON≌△PAE以及△POD≌△PAM,从而得到PN=PE,PD=PM,进而证到△PED≌△PNM、由这几组全等三角形就可得到∠PMA=∠PDO=∠PMN,那么有PM平分∠AMN、解答:〔1〕解:∵+〔A+〕2=0,∴K﹣=0,A+=0,解得:K=,A=﹣,∴反比例函数解析式为:Y=、〔2〕解:过点A作AE⊥OC,垂足为E,过点B作BF⊥OC,垂足为F,如图1,设点A〔M,〕,∵AE⊥OC,BF⊥OC,∴AE∥BF、∴△CFB∽△CEA、∴=、∵AB=BC,∴AC=2BC、∴AE=2BF、∴BF=、∴OF==2M、∴点B〔2M,〕、∵一次函数Y=﹣X+B与反比例函数Y=〔X》0〕的图象交于点A、B,∴、解得:、∴B的值为、〔3〕证明:延长AO与射线PN交于点D,连接AP,过点A作AH⊥OC,垂足为H,如图2,联立、解得:、∴点A的坐标为〔1,〕,OH=1,AH=、∴OA=2,∠AOH=60°、由﹣X+2=0得X=2,那么OC=2、∴OA=OC、∴△OAC是等边三角形、∴∠OAC=60°,OA=AC、∵OP=OA,∠AOP=60°,∴△AOP是等边三角形、∴OP=AP,∠PAO=∠OPA=60°、∵∠NPM=60°,∴∠NPM=∠OPA、∴∠NPO=∠EPA、∵∠PON=180°﹣∠AOP﹣∠AOC=60°,∴∠PON=∠PAE、在△PON和△PAE中,∴△PON≌△PAE〔ASA〕、∴PN=PE、同理可得:△POD≌△PAM、∴PD=PM,∠PDO=∠PMA、在△PED和△PNM中,、∴△PED≌△PNM〔SAS〕、∴∠PDE=∠PMN、∴∠PMA=∠PMN、∴PM平分∠AMN、点评:此题考查了一次函数与反比例函数的交点问题、相似三角形的判定与性质、全等三角形的判定与性质、等边三角形的判定与性质、二次根式的性质等知识,综合性非常强,有一定的难度、而证出△POD≌△PAM和△PED≌△PNM是解决第三小题的关键、。
2018-2019学年湖北省武汉市七一中学九年级(下)月考化学试卷(2月份)(解析版)

2018-2019学年湖北省武汉市七一中学九年级(下)月考化学试卷(2月份)一、选择题(每小题只有一个正确选项,请把正确的选项填到答题卡中,每小题3分,共60分)1.(3分)生活中的下列变化,属于化学变化的是()A.冰雪融化B.钢铁生锈C.汽油挥发D.铁铸成锅2.(3分)如图所示是利用海水提取粗盐的过程:根据海水晒盐的原理,下列说法中正确的是()A.海水是纯净物B.在蒸发池中,海水中氯化钠的质量逐渐增加C.在蒸发池中,海水中水的质量逐渐增加D.析出晶体后的母液是氯化钠的饱和溶液3.(3分)下列能组成溶液的混合物中,水是溶剂的是()A.碘酒溶液B.医用消毒酒精C.植物油滴入水中D.植物油溶解在汽油中4.(3分)下列叙述中正确的是()A.锌能置换出盐酸、稀硫酸中的氢气B.在金属活动性顺序表里,镁的位置比铁靠前,所以镁的活动性比铁强C.铁能把位于它后面的金属从它们的化合物中置换出来D.铝能与硫酸钠溶液发生置换反应5.(3分)由如图信息可知,金属活动性最不活泼的是()A.镁B.锌C.铁D.铜6.(3分)一定质量的锌、铁分别和等质量、等浓度的盐酸反应,产生氢气质量与时间的关系如图所示,下列说法正确的是()A.t1时,产生氢气的质量锌比铁小B.t1时,产生氢气的速率铁比锌大C.t2时,参加反应锌的质量与铁相同D.t2时,锌、铁消耗的盐酸质量相同7.(3分)将镁粉和锌粉的混合物a g加入到硫酸亚铁和硫酸铜的混合溶液中,充分反应后过滤,向滤渣中加入稀盐酸,有气泡产生。
关于该实验有下列说法:①滤液肯定呈无色;②滤液中一定要硫酸镁,可能有硫酸锌,一定没有硫酸亚铁、硫酸铜③用磁铁靠近滤渣,滤渣成分不会被吸引;④若将滤渣洗涤干燥后称量,其质量可能大于a g;⑤向滤渣中加入一定量的稀盐酸后,得到的溶液可能显无色以上说法中正确的是()A.①④B.②④C.①⑤D.④⑤8.(3分)在氯化亚铁、氯化铜和氯化镁的混合溶液中加入一定量的锌粉,反应停止后过滤,向滤液中插入洁净的铁丝,铁丝表面无明显变化。
2018-2019学年第一学期湖北省武汉市七一华源中学九年级10月月考数学试卷

2018-2019学年度上学期武汉七一华源中学九年级数学十月检测试题一.选择题(共10小题,每小题3分,共30分) 1.下列交通标志中,是中心对称图形的是( )2.方程4x 2-1=0的根是( ) A .x =12B . 1x =12,2x =-12C .x =2D . 1x =2,2x =-23.方程x 2-4x +5=0根的情况是( ) A .有两个不相等的实数根 B .有两个相等的实数根C .有一个实数根D .没有实数根.4.如图所示,△ABC 中,∠BAC =30°,将△ABC 绕点A 顺时针方向旋转50°,对应得到△AB ′C ′,则∠B ′AC 的度数为( )A .30°B .50°C .20°D .40°C 'B 'CB A第4题图第9题图5.二次函数y =ax 2+bx +2的图象经过点(-1,0),则代数式a -b 的值为( )A .0B .-2C .-1D .26.函数y =-x 2-4x -3图象的顶点坐标是( )A .(2,-1)B .(-2,1)C .(-2,-1)D .(2,1)7.一元二次方程y 2-y -34=0配方后可化为( )A . 21()2y +=1B . 21()2y -=1C . 21()2y +=34D . 21()2y -=348.某汽车生产商新推出一款新型电动低能耗汽车,由于该型号汽车经济适用性强,销量快速增长.1月份该型号汽车的销量为2000辆,3月份该型号汽车的销量达4500辆.设该型号汽车销量的月平均増长率为x ,则根据题意可列方程为( )A .2000(1+x )2=4500B .2000(1+2x )=4500C .2000(1-x )2=4500D .2000x 2=45009.如图一段抛物线:y =-x (x -3)(0≤x ≤3),记为C 1,它与x 轴交于点O 和A 1,将C 1绕A 1旋转180°得到C 2,交x 轴于A 2;将C 2绕A 2旋转180°得到C 3,交x 轴于A 3,…,如此进行下去,直至得到C 10,若点P (28,m )在第10段抛物线C 10上,则m 的值为( )A .1B .-1C .2D .-210.已知直线PQ 过y 轴的正半轴上一个定点M ,交抛物线y =14x 2于P 、Q .若对过点M 的任意直线PQ ,都有21MP +21MQ 为定值,则点M 的坐标是( )A .(0,1)B .(0,2)C .(0,3)D .(0,4)二.填空题(共6小题,每小题3分,共18分)11.在平面直角坐标系中,点P (-5,3)关于原点对称点P 的坐标是 . 12.已知a 、b 是一元二次方程x 2-6x +5=0的两个实数根,则ab 的值是 .13.如图,在矩形ABCD 中,AD =3,将矩形ABCD 绕点A 逆时针旋转,得到矩形AEFG ,点B 的对应点E 落在CD 上,且DE =EF ,则AB 的长为.G F E DCBA第13题图第14题图14.二次函数y =ax 2+bx 的图象如图,若一元二次方程ax 2+bx +m =0有实数根,则m 的取值范围是 . 15.若(a 2+b 2)(a 2+b 2-1)=12,则a 2+b 2的值为 .16.抛物线y =2x 2-ax +m -a 与x 轴相交于不同两点A (x 1,0)、B (x 2,0),若存在整数a 及整数m ,使得1<x 1<3和1<x 2<3同时成立,则m = . 三.解答题(共8小题,共72分) 17.(本题8分)解方程:x 2+4x -1=0.18.(本题8分)如图,在平面直角坐标系中,A (1,1),B (4,2),C (2,3). (1)请画出将△ABC 向下平移3个单位得到的△A 1B 1C 1;(2)请画出以点O 为旋转中心,将△ABC 逆时针旋转90°得到的△A 2B 2C 2; (3)请直接写出A 1A 2的距离.19.(本题8分)已知抛物线y 1=x 2与直线y 2=-12x +3相交于A 、B 两点. (1)求A 、B 两点的坐标;(2)点O 为坐标原点,△AOB 的面积等于 ; (3)当y 1<y 2时,x 的取值范围是 .20.(本题8分)关于x的一元二次方程x2-(k+3)x+2k+2=0.(1)若方程有一个根是3,求k的值;(2)若方程有一根小于1,求k的取值范围.21.(本题8分)为了迎接“军运会”,江岸区永清街道决定对一块矩形空地进行改造.如图,已知该矩形空地长为90m,宽为60m,按照规划将预留总面积为4536m2的四个小矩形区域(阴影部分)种植花草,并在花草周围修建三条横向通道和三条纵向通道,各通道的宽度相等.(1)求各通道的宽度;(2)现有一工程队承接了对这4536m2的区域(阴影部分)进行种植花草的绿化任务,该工程队先按照原计划进行施工,在完成了536m2的绿化任务后,将工作效率提高25%,结果提前2天完成任务,则该工程队原).计划每天完成平方米的绿化任务(直接写出答案22.(本题10分)彬彬童装店销售某款童装,每件售价为60元,每星期可卖100件,该店决定降价销售,经市场调査反应:每降价1元,每星期可多卖10件.已知该款童装每件成本30元.设该款童装每件进价x元,每星期的销售量为y件.(1)求y与x之间的函数关系式(不求自变量的取值范围);(2)当每件售价定为多少元时,每星期的销售利润最大,最大利润是多少?(3)①当每件童装售价定为元时,该店一星期可获得3910元的利润(请直接写出答案);②若该店每星期想要获得不低于3910元的利润,则每星期至少要销售该款童装件(请直接写出答案).23.(本题10分)如图1,在△ABC 中,AC =7,∠ACB =45°,将△ABC 绕点B 按顺时针方向旋转,得到△DBE (其中A 与D 对应).(1)如图2,当点C 在线段ED 的延长线上时,△CDB 的面积为2. ①求证:CB 平分∠ACE ;②求BC 的长;(2)在(1)的条件下继续旋转,如图3,点F 为线段AB 的中点,点P 是线段DE 上的动点,在旋转的过程中,线段FP 长度的最大值与最小值之和等于 (请直接写出答案).图1ED CBA图2AB C DE图3PF EABCD24.(本题12分)如图,在平面直角坐标系xOy 中,抛物线y =-x 2+bx +c 与直线l :y =kx +m (k <0)交于A (-1,-1)、B 两点,与y 轴交于C (0,2).(1)求抛物线的函数表达式; (2)若y 轴平分∠ACB ,求k 的值;(3)若在x 轴上有且只有一点P ,使∠APB =90°,求k 的值.。
湖北省武汉市七一中学2018-2019学年度下学期5月考九年级物理试卷(二)(无答案)

七一中学五月月考物理检测试题2命题人:杨熹审题人:林新堤全卷g取10N/kg,ρ水=l.0x103kg/m3, c水=4.2x103J/(kg•℃)第I卷(选择题,共36分)9关于声现象,下列说法中正确的是( )A.将耳朵贴在足够长的铁管的一端敲一下铁管的另一端听到了两次敲打的声音这是因为声音的回声造成的B.骨传导可以有效避免嘈杂环境的干扰,常应用在工业、战场等特殊场合C.高音调的波形一般比低音调的波形更密集,相邻波峰之间的距离较大D.为了保证工作和学习,声音不能超过90dB10关于光现象,对下列图片的文字表述正确的是( )A.甲图中的亮斑是由于光的直线传播形成的太阳的虚像B乙图中通过后视镜观察到的景物是光的折射形成的实像C.丙图中白光经过三棱镜后发生光的色散,紫光偏折的最厉害D.丁图中光线发生的是漫反射,原因是反射光杂乱无章11.如图是一款新型无叶电风扇,与传统有叶风扇相比具有易清洁、气流稳、安全等特点。
开始时,底座中的电动机将空气从进风口吸入,吸入的空气经压缩后进入圆环空腔,再从圆环空腔上的细缝中高速吹出,夹带着周边的空气一起向前流动,导致后方更多的空气流入电扇出风口,风量被显著放大下列说法错误的是( )A.风扇正常运行时,相同时间内细缝口流出的空气质量等于进风口流进的空气质量B.后方更多的空气流入电扇出风口的原理跟飞机飞行时机翼获得升力的原理相同C.跟普通电风扇相比,在风量相同时,无叶风扇消耗电能少,更节能D.风扇吹出的风使人觉得凉快,是因为加快了空气蒸发吸热12.如图所示,许多人造地球卫星在大气层外沿椭圆轨道绕地球运行,离地球最近的一点叫近地点,最远的一点叫远地点,下列有关卫星说法不正确的是( )A.卫星在运行过程中不受空气阻力,机械能守恒B若卫星运行到远地点时所有外力全部消失,卫星将静止C卫星在沿椭圆轨道绕地球运行时,受力不平衡D.卫星从远地点向近地点运行时,速度在不断增大13.小明进行探究滑动摩擦力的大小与哪些因素有关的实验实验过程如图所示,下列表述正确的是( )A.在实验过程中,他不需要拉着木块作匀速直线运动B比较乙丙两图能说明滑动摩擦力的大小与接触面的粗糙程度有关C.在甲图中,他把木块侧放,按照正确的实验步骤再次读出弹簧测力计的示数,他这样操作是为了探究滑动摩擦力的大小与接触面积的关系D在实验乙中,若木块上方砝码的重力为0.5N。
湖北省武汉市七一中学2018-2019学年度10月考九年级数学试题

七一华源中学2018~2019学年度上学期九年级数学十月检测试题一、选择题(共10小题,每小题3分,共30分)1.下列交通标志中,是中心对称图形的是()2.方程4x2-1=0的根是()A.21=x B.212121-==xx,C.x=2 D.x1=2,x2=-23.方程x2-4x+5=0根的情况是()A.有两个不相等的实数根B.有两个相等的实数根C.有一个实数根D.没有实数根4.如图所示,△ABC中,∠BAC=30°,将△ABC绕点A顺时针方向旋转50°,对应得到△AB′C′,则∠B′AC的度数为()A.30°B.50°C.20°D.40°5.二次函数y=ax2+bx+2的图象经过点(-1,0),则代数式a-b的值为()A.0 B.-2 C.-1 D.26.函数y=-x2-4x-3图象的顶点坐标是()A.(2,-1) B.(-2,1) C.(-2,-1) D.(2,1)7.一元二次方程0432=--yy配方后可化为()A.1)21(2=+y B.1)21(2=-y C.43)21(2=+y D.43)21(2=-y8.某汽车生产商新推出一款新型电动低能耗汽车,由于该型号汽车经济适用性强,销量快速增长,1月份该型号汽车的销量为2000辆,3月份该型号汽车的销量达4500辆.设该型号汽车销量的月平均增长率为x ,则根据题意可列方程为( )A .2000(1+x )2=4500B .2000(1+2x )=4500C .2000(1-x )2=4500D .2000x 2=45009.如图一段抛物线:y =-x (x -3)(0≤x ≤3),记为C 1,它与x 轴交于点O 和A 1;将C 1绕A 1旋转180°得到C 2,交x 轴于A 2;将C 2绕A 2旋转180°得到C 3,交x 轴于A 3,……,如此进行下去,直至得到C 10.若点P (28,m )在第10段抛物线C 10上,则m 的值为( )A .1B .-1C .2D .-2 10.已知直线PQ 过y 轴的正半轴上一个定点M ,交抛物线241x y =于P 、Q .若对过点M 的任意直线PQ ,都有2211MQ MP+为定值,则点M 的坐标是( ) A .(0,1)B .(0,2)C .(0,3)D .(0,4)二、填空题(本大题共6个小题,每小题3分,共18分)11.在平面直角坐标系中,点P (-5,3)关于原点对称点P ′的坐标是___________12.已知a 、b 是一元二次方程x 2-6x +5=0的两个实数根,则ab 的值是___________13.如图,在矩形ABCD 中,AD =3,将矩形ABCD 绕点A 逆时针旋转,得到矩形AEFG ,点B 的对应点E 落在CD 上,且DE =EF ,则AB 的长为___________14.二次函数y =ax 2+bx 的图象如图,若一元二次方程ax 2+bx +m =0有实数根,则m 的取值范围是___________15.若(a 2+b 2)(a 2+b 2-1)=12,则a 2+b 2的值为___________16.抛物线y =2x 2-ax +m -a 与x 轴相交于不同两点A (x 1,0)、B (x 2,0).若存在整数a 及m ,使得1<x 1<3和1<x 2<3同时成立,则m =___________三、解答题(共8题,共72分)17.(本题8分)解方程:x 2+4x -1=018.(本题8分)如图,在平面直角坐标系中,A (1,1)、B (4,2)、C (2,3)(1) 请画出将△ABC 向下平移3个单位得到的△A 1B 1C 1(2) 请画出以点O 为旋转中心,将△ABC 逆时针旋转90°得到的△A 1B 2C 2(3) 请直接写出A 1A 2的距离19.(本题8分)已知抛物线y 1=x 2与直线3212+-=x y 相交于A 、B 两点 (1) 求A 、B 两点的坐标(2) 点O 为坐标原点,△AOB 的面积等于___________(3) 当y 1<y 2时,x 的取值范围是________________20.(本题8分)关于x 的一元二次方程x 2-(k +3)x +2k +2=0(1) 若方程有一个根是3,求k的值(2) 若方程有一根小于1,求k的取值范围21.(本题8分)为了迎接“军运会”,江岸区永清街道决定对一块矩形空地进行改造.如图,已知该矩形空地长为90m、宽为60m,按照规划将预留总面积为4536m2的四个小矩形区域(阴影部分)种植花草,并在花草周围修建三条横向通道和三条纵向通道,各通道的宽度相等(1) 求各通道的宽度(2) 现有一工程队承接了对这4536m2的区域(阴影部分)进行种植花草的绿化任务,该工程队先按照原计划进行施工,在完成了536m2的绿化任务后,将工作效率提高25%,结果提前2天完成任务,则该工程队原计划每天完成___________平方米的绿化任务(直接写出答案)22.(本题10分)彬彬童装店销售某款童装,每件售价为60元,每星期可卖100件,为了促销,该店决定降价销售,经市场调查反应:每降价1元,每星期可多卖10件.已知该款童装每件成本30元.设该款童装每件售价x元,每星期的销售量为y件(1) 求y与x之间的函数关系式(不求自变量的取值范围)(2) 当每件售价定为多少元时,每星期的销售利润最大,最大利润是多少?(3) ①当每件童装售价定为________元时,该店一星期可获得3910元的利润(请直接写出答案)②若该店每星期想要获得不低于3910元的利润,则每星期至少要销售该款童装________件(请直接写出答案23.(本题10分)如图1,在△ABC中,AC=7,∠ACB=45°.将△ABC绕点B按顺时针方向旋转,得到△DBE(其中A与D对应)(1) 如图2,当点C在线段ED的延长线上时,△CDB的面积为2①求证:CB平分∠ACE;②求BC的长(2) 如图3,在(1)的条件下,点F为线段AB的中点,点P是线段DE上的动点,在旋转过程中,线段FP长度的最大值与最小值之和等于__________(请直接写出答案)24.(本题12分)如图,在平面直角坐标系xOy中,抛物线y=-x2+bx+c与直线l:y=kx+m (k<0)交于A(-1,-1)、B两点,与y轴交于C(0,2)(1) 求抛物线的函数表达式(2) 若y轴平分∠ACB,求k的值(3) 若在x轴上有且仅有一点P,使∠APB=90°,求k的值。
湖北省七一中学2018-2019学年度下学期5月考九年级英语试卷(二)(word版)

湖北省七一中学2018-2019学年度下学期5月考九年级英语试卷(二)(W o r d版) -CAL-FENGHAI.-(YICAI)-Company One12018-2019学年度下学期九年级英语五月检测试题2命题人:张茜谌燕审题人:李姣第I卷(选择题共85分)第一部分听力部分一、听力测试(共三节,满分 4分)第一节(共5小题,每小题1分,满分4分)听下面5个问题,每个问题后有三个答语,从题中所给的A、B、C三个选项中选出最佳选项。
听完每个问题后,你都有5秒钟的时间来作答和阅读下一小题。
每个问题仅读一遍。
1. A. Tom B. H-U-N-T C. I’m a boy2. A. I like it B. Very cute C. Some sand , I guess3. A. My parents B. Next week C. By bike4. A. A toy cat B. The red one C. Very nice第二节(共8题,每小题1分,满分8分)听下面7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。
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。
每个问题仅读一遍。
5. How many days are the speakers going go stay in Wuhan?A. 5B. 6C. 76. Who will probably go out for a walk soon?A. The manB. The womanC. Both of them7. How’s the school now?A. It’s not as good as it wasB. It’s better than people sayC. It’s even worse than people say.8. What can we learn about the man?A. He is very tiredB. He is hungryC. He is disappointed9. What does the man want to do next?A. Stop for some coffeeB. Keep on workingC. Leave for home10. Who are the two speakers?A. Teacher and student.B. Mother and sonC. Husband and wife11. What is the boy probably doing?A. Feeding a rabbitB. Doing homeworkC. Taking out the rubbish12. What does the man mean?A. He didn’t get home in time.B. He missed part of the TV program me.C. He found the TV program me boring.C. To enjoy some nice pictures of birds.第三节(共13 小题,每小题1分,满分13分)听下面4段对话或独白,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。
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2018-2019年七一中学九年级起点考试卷二、选择填空26. —Do you think I could borrow your dictionary?—__________.A. Yes, you may borrowB. Yes, you couldC. Yes, go onD. Yes, help yourself27. —How is everything going?—__________.A. Everything is finishedB. Nothing has been doneC. Not so bad, you knowD. Not doing wrong, you see28. —I had a really good weekend at my uncle’s.—__________.A. Oh, I’m glad to hear thatB. CongratulationsC. It’s a pleasureD. Oh, that’s very nice of you29. —How do you learn English so well?—_______chatting with my uncle in America on line.A. ForB. ByC. InD. With30. —Don’t _________me. I need some time to think about it?—All right. I’ll wait until you make a decision.A. punishB. rushC. leadD. warn31. He is very open and _________. If he knows something, he will tell us.A. patientB. commonC. politeD. direct32. —Tom,I heard that you moved to a new place.—Right, I now live next to a supermarket. It’s very _______.A. safeB. suddenC. convenientD. central33. While a person is asleep, a part of his brain is still _______.A. activeB. aliveC. awakeD. afraid34. He caught the thief by himself on the bus. All of us _______ him for his courage.A. enjoyedB. imaginedC. admiredD. warned35. —Who is the girl standing over there?—Well, if you _______know, her name is Joe.A. mayB. mustC. canD. shall36. —I don’t want to tell you about it.—Believe me. I won’t let out the _______.A. dayB. influenceC. secretD. duty37. The doctor _______her for a broken arm.A. tiedB. punishedC. treatedD. discovered38. Don’t always _______ a dictionary if you meet some new words.A. look upB. depend onC. put onD. look after39. —Which pen do you like, the red one or the blue one?—I think I won’t choose _______ of them. In fact, I like the black one.A. eitherB. neitherC. bothD. all40. —Could you tell me _______?—Of course.A. where’s there a good place to eatB. where there’s a good place to eatC. where is a good place to eatD. where a good place to eat三、完形填空If you have ever been discouraged because of failure, please read on.For often, 41 what you set out to do is not the important thing. Let me explain.Two brothers decided to dig a deep hole behind their house. As they were working, several older boys stopped by to 42 .“What are you doing?” asked one of the visitors.“We plan to dig a hole all the way through the earth!” one of the brothers43 excitedly.The older boys began to laugh, telling the younger ones that digging a hole all the way through the earth was 44 .After a long 45 one of the diggers picked up a jar full of spiders,worms and some other kinds of insects. He removed the lid and showed the 46 things in it to the scoffing visitors.Then he said quietly and 47 “Even if we don’t dig all the way through the earth, look at what we found along the way!”Their goal was far too ambitious, but it did cause them to dig. And that is what a goal is for-to cause us to move in the 48 we have chosen; in other words, to 49 us digging!But not every goal will be fully achieved. Not every job will 50 successfully. Not every relationship will endure. Not every love will 51 . Not every dream will be 52 .But 53 you fall short of your aim, perhaps you can say, “Yes, but look at what I found along the way! Look at the wonderful things which have 54 my life because I tried to do something”It is in the digging that life is lived. And I believe it is joy in the journey, in the end, that truly 55 .41. A. achieving B. knowing C. receiving D. finding42. A. help B. laugh C. watch D. visit43. A. cried B. explained C. added D. joked44. A. impossible B. imaginary C. secret D. surprising45. A. argument B. laugh C. talk D. silence46. A. terrible B. wonderful C. interesting D. awful47. A. slowly B. quickly C. hurriedly D. confidently48. A. instruction B. direction C. road D. choice49. A. make B. let C. set D. push50. A. end B. begin C. do D. realize51. A. meet B. own C. last D. keep52. A. completed B. realized C. started D. finished53. A. when B. before C. unless D. because54. A. come by B. come out C. come into D. come along55. A. minds B. shows C. appears D. matters四、阅读理解A56. The above reading is more probably ____________________.A. a posterB. a book reportC. a rain check for a book saleD. a ticket for a big sale57. It’s clear that the 36th book sale begins on ___________________.A. October 5, 2012B. October 4, 2012C. January 31, 2013D. February 1. 201358. If you want to get some cheapest books, you’d better get to the Needham Public Library___________.A. at 9:00 am on Oct. 4B. before 4:00 pm on Oct. 4C. at 9:00 am on Oct. 5D. between 1:00 and 4:00 pm on Oct. 559. The reading tells us at 2:00 pm on Oct. 5 you need to pay only _______ for a book with a hard cover.A. 50 centsB. 25 centsC. 1 dollarD. 8 dollars60. Which of the following is the best way to get some information for the next book sale?A. To visit the ongoing book sale when the library is openB. To telephone the manager of the libraryC. To send an e-mail to booksales @needhamlibrary. org.D. To mark you calendars right now.BShe turned up at the doorstep of my house in Cornwall. No way could I have sent her away. No way, not me anyway. Maybe someone had kicked her out of their car the night before. "We're moving house." "No space for her any more with the baby coming." "We never really wanted her, but what could we have done? She was a present." People find all sorts of excuses for abandoning an animal. And she was one of the most beautiful dogs I had ever seen.I called her Goldie. If I had known what was going to happen I would have given her a more creative name. She was so unsettled during those first few days. She hardly ate anything and had such an air of sadness about her. There was nothing I could do to make her happy, it seemed. Heaven knows what had happened to her at her previous owner's. But eventually at the end of the first week she calmed down. Always by my side, whether we were out on one of our long walks or sitting by the fire.That's why it was such a shock when she pulled away from me one day when we were out for a walk. We were a long way from home, when she started barking and getting very restless. Eventually I couldn't hold her any longer and she raced off down the road towards a farmhouse in the distance as fast as she could.By the time I reached the farm I was very tired and upset with Goldie. But when I saw her licking (舔) the four puppies (幼犬) I started to feel sympathy towards them. "We didn't know what had happened to her," said the woman at the door. "I took her for a walk one day, soon after the puppies were born, and she just disappeared." "She must have tried to come back to them and got lost," added a boy from behind her.I must admit I do miss Goldie, but I've got Nugget now, and she looks just like her mother. And I've learnt a good lesson: not to judge people.61. How did the author feel about Goldie when Goldie came to the house?A. Shocked.B. Sympathetic.C. Annoyed.D. Upset.62. In her first few days at the author's house, Goldie________.A. felt worriedB. was angryC. ate a littleD. sat by the fire63. Goldie rushed off to a farmhouse one day because she ________.A. saw her puppiesB. heard familiar barkingsC. wanted to leave the author.D. found her way to her old home64. What is the closest meaning of the word "restless"?A. without restB. unable to stay still.C. boreD. excited65. Which is the best title of the passage?A. The Way Back HomeB. A Lovely DogC. Goldie's SecretD. Love AnimalsCIt was my very first teaching job, I worked with a group of four-year-olds. The first day went really well: Kelly only fell over twice. After several days of carrying her to and from the yard, I thought, why not encourage her to walk down the hallway a little by herself? I asked Kelly if she would like to try it, and she became very excited. The next day Kelly began her first journey down the hallway, about ten feet away. We were both excited! But my assistants were against that I was encouraging this poor child to walk. But Kelly wanted to do her best.And so we began to practice walking down the hall. I was quite nervous at first, but she just smiled and told me not to worry, she was perfectly fine. Each day Kelly and I continued our slow walk down the hallway. Weeks passed and Kelly continued to walk out to the yard every day. We hardly ever carried her.One day in December, I was told Kelly was in hospital getting her checkup. On Monday morning, when her mom brought her back to school, she asked if I had been doing anything differently with Kelly.I was n’t quite sure what she meant.“Her legs have got more exercise in the past few months than in the past four years of her life.” she looked at me with tears in her eyes and told me that Kell y’s bad legs became much better.“ I don’t know how to thank you for everything you have done for my daughter.”Seventeen years later, I still think back to the first time Kelly made it down the long hallway. She taught me that no obstacle(障碍) in life is too big to overcome. You just need to keep working at it---one step at a time.66. Why did the writer want to teach Kelly to walk?A. Because she wanted Kelly to walk by herself later on.B. Because she thought Kelly was too much trouble to her.C. Because Kelly was as healthy as any other kids.D. Because Kelly hoped to get into another classroom down the hallway.67. What did you think of Kelly in the walking?A. She couldn't learn a good way to walk.B. She liked doing something difficult.C. She was good at asking for others’ help.D. She could hold on to something she was doing.68. Kel ly’s mother asked if I had been doing anything differently with Kelly, she really meant that .A. the teacher shouldn't make her daughter walk so far without permission.B. the teacher should be fair to her daughter as other kids.C. it was the teacher's training that helped her daughter's legs get better.D. it was not good for the teacher to do something differently to her daughter.69. We can infer from the last paragraph that .A. Kelly became a teacher like the writer.B. the teacher could face any difficulties in her life.C. Kelly will always remember the teacher.D. the teacher would be in great trouble in the future.70. Which of the following is true?A. Kelly was a disabled girl.B. The mother didn’t care much about her daughter.C.The assistants were in agreement with the writer.D. The teacher found it hard to teacher Kelly.五、词与短语选择填空。