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2010年上海市普陀区初中物理一模试题及答案

2010年上海市普陀区初中物理一模试题及答案

2009学年度第一学期普陀区初三质量调研理化试卷物理部分一、选择题(共16分)1.我国家庭照明电路的电压是( ) A 380 伏。

B 220伏。

C 24伏。

D 1.5伏。

2.一位中学生站立在水平地面上,对水平地面的压强约为( )A 2×102帕。

B 2×103帕。

C 2×104帕。

D 2×105帕。

3.用20牛的水平力把重力为15牛的木块紧压在竖直的墙壁上,这时木块对墙壁的压力是( )A 5牛。

B 15牛。

C 20牛。

D 35牛。

4.通过查下表可知,某一个容器最多可以装1千克的水,用它一定能装得下1千克的液体是( ) A 盐水。

B 植物油。

C 酒精。

D 汽油。

5.在研究串联电路,引出“总电阻”概念时,所运用的科学研究方法是( )A 控制变量法。

B 理想模型法。

C 类比法。

D 等效替代法。

6.电阻R 1=100欧,R 2=1欧,它们并联之后的总电阻R 的阻值范围是( ) A 一定小于1欧。

B 可能在1—100欧之间。

C 一定大于100欧。

D 可能等于1欧。

7.如图1所示的电路,电源电压不变,闭合电键S ,灯L 1和L 2都能正常发光,一段时间后,发现两个电表中的一个示数发生了变化,则产生这一现象的可能原因是\( )A 灯L 1短路。

B 灯L 1断路。

C 灯L 2短路。

D 灯L 2断路。

8.在两个完全相同的容器A 和B 中分别装有等质量的水和酒精(ρ水>ρ酒精),现将两个完全相同的长方体木块甲和乙分别放到两种液体中,如图2所示,则此时甲和乙长方体木块下表面所受的压强P 甲、P 乙,以及A 和B 两容器底部所受的压力F A 、F B 的关系是 ( )A P 甲 < P 乙 F A < FB 。

B P 甲 = P 乙 F A >F B 。

C P 甲 = P 乙 F A < F B 。

D P 甲 = P 乙 F A = F B 。

2010年上海市普陀区初中英语一模卷试题及参考答案【纯word版,完美打印】

2010年上海市普陀区初中英语一模卷试题及参考答案【纯word版,完美打印】

2009学年度第一学期普陀区初三质量调研英语试卷(满分150分,考试时间100分钟)Part 2 Vocabulary and GrammarV. Choose the best answer. (共26分)31.We had eight-day holiday in October last year.A) a B) an C) the D) /32. The 5th East Asian Games were held _______ December, 2009.A) in B) on C) of D) at33. Mrs Green asked the kids to help _____ to the food and drinks.A) they B) them C) themselves D) their34. Neither of the scarves fits you. You’d better try on _____ one.A) other B) the other C) another D) others35. The artist became well known _____ .A) in his thirties B) of thirty C) about thirty D) the thirtieth36. James usually goes to work his bike.A) by B) on C) in D) with37. He was so unlucky yesterday that everything seemed to ______ .A) go wrong B) go on C) go over D) go up38.There is still ______ time left. You don’t need to hurry.A) few B) a few C) little D) a little39. Stories with dramatic endings are much ______ .A) interested B) more interested C) interesting D) more interesting40. ______ we to do the survey right now? Can we do it later?A) Need B) Ought C) Must D) Should41. As a writer, Ann travels ______ to look for all kinds of facts that can give her more ideas forher books.A) closely B) excitedly C) widely D) accurately42. I want _____ coffee _____ tea at the moment. I’d prefer a cup of iced juice.A) not only…but also B) both…andC) neither…nor D) either…or43. Peter’s French sounds ______ enough to communicate with the local people.A) well B) good C) better D) wonderfully44. Please don’t take the books out of the reading room _____ you are allowed to.A) when B) after C) if D) unless45. His English improved after he stayed with the British family for 3 months.Which is closest in meaning to the underlined part?A) became larger B) became better C) became easier D) became different46. Many people are not satisfied with the service of the restaurants at the Spring Festival.Which is closest in meaning to the underlined part?A) pleased with B) angry with C) responsible for D) fond of47. We have built bridges and tunnels to ______ the two big parts of the city.A) admit B) connect C) pull D) realize48. Thousands of people ______ Chong Ming since last November .A) visit B) visited C) have visited D) had visited49. Susan said she didn’t mind _____ for an hour to get a seat in her favourite restaurant.A) to wait B) waiting C) waited D) would wait50. Some people think that cartoons are easy _____.A) draw B) drawing C) to draw D) drew51. The traffic will be much better if everybody _____ the rules.A) obeys B) will obey C) is obeying D) obeyed52. Do you know how many cars ______ in Shanghai every year?A) produce B) will produce C) are producing D) are produced53. -- _____ do these apples weigh? – 20 kilos.A) How many B) How much C) How soon D) How far54. I wonder ______ .A) how will they manage it B) how they will manage itC) how would they manage it D) how they would manage it55. – Let’s go to the car exhibition this Sunday.– ______A) You’re welcome. B) Thank you very much .C) I don’t feel like it. D) I don’t think so .56. – I found a new job yesterday.– ______A) Congratulations! B) Funny!C) I agree. D) Good idea.VI. Complete the sentences with the given words in their proper forms: (共8分)57. The TV news reported the celebration of the old man’s _______ birthday.(hundred)58. Wang Damin enjoys _______ with his big birds. ( fish )59. The text was too difficult for the students to understand _______. ( complete )60. H1N1 flu has caused many people’s _______ all over the world. (die)61. Being too busy every day will make one _______ sometimes. (forget)62. The 2-metre _______ helps the boy become a good basketball player. ( high )63. Nowadays we can find many ways to _______ ourselves . ( relaxing )64. Although she wasn’t hurt in the accident, she was terribly _______. ( frighten )VII. Rewrite the sentences as required:(共12分)65. There is some fruit in the basket. (改为否定句)There fruit in the basket.66. They cut down part of the trees to stop the forest fire. (改为一般疑问句)they ________ down part of the trees to stop the forest fire?67. He is good at cooking. (改为感叹句)a good he is!68. Please tell me when I should finish the report. (改为简单句)Please tell me when _______ _______ the report.69. Kitty bought the handbag for 230 yuan. (保持句意基本不变)Kitty _______ 230 yuan ______ the handbag.70.Jack goes to New York on business once a year. (对划线部分提问)_______ _______ does Jack go to New York on business?Part 3 Reading and WritingVIII. R eading comprehension. (共56分)( A )Hetty Robinson was born in 1834. When her parents died, they left her $10 million. She was very good at business and made more money. Soon Hetty became the richest woman in the United States, but she was very stingy(吝啬的).Hetty always wore the same black dress. The color of the dress changed to green and then to brown as the years passed by. Her home was a run-down flat with no heat in New Jersey. All she ate was onions, eggs, and cold cereal. She was too stingy to heat her food.She was married for a short time to a millionaire, Edward Green and had a son. She was even stingy with her own child. For example, when her son hurt his knee in an accident, Hetty did not call a doctor. She dressed her son in old clothes and took him to a free clinic. The doctors knew her and asked for money. Hetty refused and took her son home. The boy did not get medical treatment, and a few years later his leg was amputated (截肢). When Hetty Green died in 1916, she left more than $100 million!True or False (本篇每题1分)71. Hetty was born in the eighteenth century.72. $10 million made Hetty the richest woman in the United States.73. .Hetty did quite well in business and her money increased.74. Hetty was too stingy to buy herself any new clothes.75. She loved cold food so much that she never heated her food.76. The doctors asked Hetty to pay as they knew she was rich.77. Hetty left a huge amount of money when she died.( B )Flat 12,19, Everton Street,Chelsea,London SW 7 Dear Theo,Thank you very much for your letter. I’ve had lots of replies to my advertisement and it’sbeen difficult to know how to reply to them all. Many were very interesting, though some were really strange! Yours was one of the best, so I’ve decided to ask you to write to me again if you are still interested after I tell you something about myself.Like you I am in Year 10 and will take my School Certificate (证书) next year. But unlike you I am quite good at maths and all science subjects and poor at all sports.I don’t like acting, but I like music very much and I play the piano well. I’m also interested in astronomy(天文学) and our hobby group are building a telescope(望远镜). It’s all very exciting.I live with my mum and dad. Mum is Irish but Dad was born in England and has only been out of it for short holidays on the Continent—as we English call Europe. I have an older brother at university. He’s studying medicine and wants to be a doctor. If all goes well, I shall take a science degree(学位) at London University. As you have already guessed, I’m sure I want to be an astronomer. Perhaps even an astronaut one day.I hope you’ll write again. Australia has one of the world’s greatest telescopes!Sincerely,Jenny Wilson Choose the best answers. (本篇每题1分)78. It’s a letter from Jenny to her ______.A) parents B) relative C) pen friend D) classmate79. Jenny comes from .A) France B) Australia C) USA D) England80. Theo is probably not good at .A) Maths B) English C) History D) P.E.81. Besides astronomy Jenny’s other hobby is _______ .A) acting B) paying ball gamesC) playing the piano D) swimming82. ______ hope is to be an astronomer in the future.A) Theo’s B) Jenny’s C) Jenny’s brother’s D) Theo’s brother’s83. The English people call ______ ― the Continent‖.A) the earth B) Asia C) Europe D) England84. According to the letter, which of the following is true ?A)Theo has never written to Jenny .B)Jenny has an older brother in secondary school.C)Jenny’s father travels a lot around the world.D)Theo and Jenny are both students of Year 10.( C )Exhibitions are common ways to show people new things. Imagine a world exhibition with thousands of companies from more than 90 countries! This is a World Expo. It usually lasts for six months and 85 millions of visitors from all over the world.World Expos show all kinds of things as exhibits(展品). They can be displays of new inventions. They can also be cultural performances. They can 86 be copies of well-known streets or buildings from different countries around the world.Countries and companies often build large interesting pavilions(临时展览馆) at World Expos. These pavilions are so beautiful that people can’t wait to buy tickets to see the 87 things inthem.The history of World Expos started in 1851 in 88 . On 1 May that year, the London World Expo opened in Hyde Park. Thirty-two countries attended and more than six million people came to visit. The country made a lot of money out of this Expo. In many ways, the 89 World Expo was a great success.Then more and more countries wanted to have an Expo. Finally, an international organization was formed in Paris in 1928. The organization 90 for World Expos. For example, an Expo should last six months and Expos should be held every five years.Many countries like to host World Expos 91 they bring a lot of attention(注意力). Tourists from all over the world visit the Expo. They also visit the city and travel through the country. This helps support the local economy.Choose the words or expressions and complete the passage. (本篇每题2分)85. A) introduces B) organizes C) attracts D) protects86. A) only B) even C) finally D) exactly87. A) common B) amazing C) familiar D) necessary88. A) France B) Italy C) Russia D) Britain89. A) first B) second C) third D) fourth90. A) held meetings B) created things C) wrote books D) made rules91. A) though B) as soon as C) because D) after(D)Read the passage and fill in the blanks with proper words. (本篇每题2分)When Florence Nightingale was a very little girl, she used to go with her mother to visit the sick people in the little town near where they lived. She helped to carry food and medicines.Like other little girls of her age, Florence was very fond of playing with her dolls(玩具娃娃). Her favourite g 92 was pretending (假装)that her dolls were sick and she took good care of them.and they became h 93 again.One sunny day, Florence was riding her horse with a friend of the family. When they came to the road, they saw an old man sitting by the roadside, with his sheepdog, Cap, beside him. It was clear that Cap’s leg was s 94 hurt and the old man looked very upset. The dog seemed to know its owner’s w 95 . It didn’t make any sound to show its pain.Seeing this, Florence jumped down from her horse immediately and e 96 the dog’s leg carefully. She found it was broken. She bandaged (用绷带扎缚)it firmly(牢固地) and it was not long before the dog stood up again. The old man couldn’t believe his eyes u 97 it began running about happily as before. He was very t 98 to Florence and told the story to everyone he knew. When Florence became well known he kept telling people that her first patient had been his sheepdog, Cap.( E )Bobby came from a poor family. He wanted to buy his mother a Christmas present, but he only had a dime(十分硬币). He walked from shop to shop and finally came to a flower shop. Bobby asked if he could buy just one flower for his mother as a Christmas present with a dime. The shop owner said, ―You just wait here and I’ll see what I can do for you.‖The shop owner came out a little later with twelve beautiful roses. ―That will be ten cents, young man. I just happen to have some roses on sale for ten cents a dozen(一打). Would you like them?‖Bobby took the long box from the man’s hands and left the shop happily.As the shop owner returned inside, his wife asked, ―Who were you talking to and where are the roses you took out?‖The man replied, ―This morning while I was preparing to open the shop, I thought I heard a voice. It told me to put aside a dozen of my best roses for a special present and I did so. Then, just a few minutes ago, a little boy came into the shop and wanted to buy a flower for his mother with a dime. When I saw him, I remembered my experience many years ago. That time I was a poor boy with nothing to buy a Christmas present for my mother. A man that I didn’t know stopped me on the street and told me that he wanted to give me ten dollars. When I saw that little boy tonight, I knew whose voice that was, and I put together a dozen of my best roses. ‖Answer the following questions.(本篇每题2分)99. The story took place just before Christmas, didn’t it?100. Who did Bobby want to buy a present for?101. How many flowers did Bobby want to buy at first?102. Were the roses in that flower shop on sale?103. How did Bobby feel when he left the flower shop?104. What did Bobby make the shop owner think of?105. What can we learn from the story?IX. Writing106. Write a passage of 60-80 words on the topic “ The Fun of Learning (English /painting/ to play the piano/ to play basketball…) ”. (以“学习(英语/绘画/弹钢琴/打篮球…)的乐趣”为题写一篇60-80词的短文,标点符号不占格。

上海普陀区2010年中考一模语文试题答案及评分标准

上海普陀区2010年中考一模语文试题答案及评分标准

上海普陀区2010年中考一模语文试题答案及评分标准普陀区初三语文第一学期期末质量抽查试卷参考答案和评分标准一、文言文(42分)(一)默写(18分,每小题3分)1. 留取丹心照汗青2. 月上柳梢头3. 一点飞鸿影下4.断肠人在天涯5. 皆若空游无所依6. 得之心而寓之酒也(二)阅读下面的诗,完成第7-8题(4分)7. 如雪花般飞舞的杨花(2分)8. A(2分)(三)阅读下文,完成第9-12题(8分)9. 孔孟论学(1分)孟轲(1分)10. 集中于某方面(2分)11. 即使是天下容易生长的植物(2分)12. D(2分)(四)阅读下文,完成第13-16题(12分)13.(1)在一起(2分)(2)大叫(2分)14. 副使尽力取来船里的东西把他们全部投到海里去,也没有时间去拣择。

(3分)15. 副使者以士衡所得缣帛藉船底,然后实己物以避漏湿。

(2分)16. 凭一己私利为人处世,最终受害的反倒是自己。

(3分)二、现代文(48分)17. C(3分)18. 猪有可能是产生新流行毒株的混合器和古老的流感病毒长期存在的贮存器。

(3分)19. 举例子、列数字(2分)用事实和数据准确说明这次疫情将是近几十年来最大规模的流感流行。

(1分)20. (1)药物及疫苗营造的人工选择压力使病毒突变的速度加快。

(3分)(2)病毒突变将使已经生产的药物和疫苗失去效用。

(3分)(3)人类难以抵御甲型H1N1和禽流感H5N1重组后的病毒。

(3分)21. (1)B(3分)(2)自我隔离(3分)22. 腼腆(2分)23. 比喻(1分)学校很快静如空巢。

或者我夹着课本进教室,发现室内乱成一锅粥。

(3分)24. 生气震惊后悔(每格1分,共3分)25. 我觉得学生们的送行方式太出格,也担心他们会受到老师的责罚。

(2分)我联想起当年的一幕,被记忆深处的学生送行场面感动了,与影片中的男教室产生了共鸣。

(2分)26. C(3分)27. (8分)关于我的心理:我既被男孩诚挚的行为所感动,也对男孩的生活境遇充满了同情,更为自己以往对他的嫌弃而心怀歉疚。

上海市普陀区2010年中考数学第二次模拟试卷及答案

上海市普陀区2010年中考数学第二次模拟试卷及答案

2009-2010学年度第二学期普陀区初三质量调研数学试卷2010.4(时间:100分钟,满分:150分)考生注意:所有答案务必按照规定在答题纸上完成,写在试卷上不给分题 号 一 二 三 四 总 分得 分一、单项选择题:(本大题共6题,每题4分,满分24分)[下列各题的四个选项中,有且只有一个选项是正确的,选择正确项的代号并填涂在答题纸的相应位置上]1.下列二次根式中,与2是同类二次根式的是………………………………………( ).(A) 8; (B) 3- ; (C) 12 ; (D) 48 .2. 两条对角线互相垂直平分的四边形是………………………………………………( ).(A) 等腰梯形; (B) 菱形; (C) 矩形; (D) 平行四边形. 3.下列条件中,能判定两个等腰三角形相似的是……………………………………( ).(A )都含有一个30°的内角; (B )都含有一个45°的内角; (C )都含有一个60°的内角; (D )都含有一个80°的内角.4.如果一元二次方程220x x k -+=有两个不相等的实数根,那么k 的取值范围是( ).(A) 1k ≥; (B) 1k ≤; (C) 1k >; (D) 1k <.5.如右图,△ABC 中,D 是边BC 的中点,BA a =,AD b =,那么BC 等于…( ).(A )a +b ; (B )12(a +b);(C )2(a +b ); (D )—(a +b).6. 气象台预报“本市明天降水概率是80%”,对此消息,下面几种说法正确的是…ADBC 第5题(A) 本市明天将有80%的地区降水; (B) 明天降水的可能性比较大; (C) 本市明天降有80%的时间降水; (D) 明天肯定下雨.二、填空题:(本大题共12题,每题4分,满分48分)[请将结果直接填入答题纸的相应位置] 7.计算:23(2)a a ⋅= .8.生物学家发现一种病毒的长度约为0.0043mm ,用科学记数法表示为 = mm . 9.当a=2时,1a -= .10.不等式组24,50x x >-⎧⎨-<⎩的解集是 .11.一元二次方程20(0)ax bx c a ++=≠有一根为零的条件是 . 12.将图形(右)绕中心旋转180°后的图形是 (画出图形). 13.函数312y x =-的定义域是 . 14. 已知一次函数3y kx =+的图像与直线2y x =平行,那么此一次函数的解析式为 .15.梯形ABCD 中,AD ∥BC ,如果∠A=5∠B ,那么∠B= 度.16. 在四边形ABCD 中,如果AB ∥CD ,AB=BC ,要使四边形ABCD 是菱形,还需添加一个条件,这个条件可以是 .17.如果一斜坡的坡度为i =1∶3,某物体沿斜面向上推进了10米,那么物体升高了米.18.中心角是40°的正多边形的边数是 .三、解答题(本大题共7题,其中第19---22题每题10分,第23、24题每题12分,第25题14分,第12题第21题19.化简:1(1)11a a a -÷++.20.解方程组:2224,2 1.x y x xy y +=⎧⎨-+=⎩21.如图,在平行四边形ABCD 中,点G 是BC 延长线上一点,AG 与BD 交于点E ,与DC 交于点F , 如果AB=m ,CG =12BC , 求:(1)DF 的长度;(2)三角形ABE 与三角形FDE 的面积之比.M22. 如图所示,已知在△ABC 中,AB=AC ,AD 是∠BAC的平分线,交BC 于点D ,AN 是△ABC 外角∠CAM 的平分线,CE ⊥AN ,垂足为点E , (1)求证:四边形ADCE 是矩形;(2)当△ABC 满足什么条件时,四边形ADCE 是一个 正方形?请加以证明.23. 为了引导学生树立正确的消费观,某机构随机调查了一所小学100名学生寒假中使用零花钱的情况(钱数取整数元),根据调查制成了频率分布表,如下:(1) 补全频率分布表;(2) 使用零化钱钱数的中位数在第 组; (3) 此机构认为,应对消费200元以上的学生提出勤俭节约的建议,那么应对该校800名学生中约名学生提出此项建议.24. 如图,在平面直角坐标系中,点O 为原点,已知点A 的坐标为(2,2),点B 、C 在x 轴上,BC =8,AB=AC ,直线AC 与y 轴相交于点D . 1)求点C 、D 的坐标;2)求图象经过B 、D 、A 三点的二次函数解析式 及它的顶点坐标.组别分 组频数 频率1 0.5—50.5 0.12 50.5—100.5 20 0.23 100.5—150.54 150.5—200.5 30 5 200.5—250.5 10 6250.5—300.5 5 合 计25.如图,已知Sin∠ABC=13,⊙O的半径为2,圆心O在射线BC上,⊙O与射线BA相交于E、F两点,EF=23,(1)求BO的长;(2)点P在射线BC上,以点P为圆心作圆,使得⊙P同时与⊙O和射线BA相切,求所有满足条件的⊙P的半径.BC上D CFA B O第25题EG2009学年度第二学期普陀区九年级质量调研数学试卷参考答案及评分说明一、单项选择题:(本大题共6题,每题4分,满分24分)1.(A) ; 2.(B) ; 3.(C); 4.(D) ; 5.(C) ; 6.(B) .二、填空题:(本大题共12题,每题4分,满分48分)7. 45a ; 8. 34.310-⨯; 9. 1; 10.25x -<<; 11. c =0; 12. ;13.2x ≠; 14.23y x =+; 15. 30; 16.AB =CD 等; 17.5 ; 18. 9. 三、解答题(本大题共7题,其中第19---22题每题10分,第23、24题每题12分,第25题14分,满分78分) 19.解:原式=1()(1)11a a a a a +-+++…………………………………………………………4′(各2分)=(1)a a -+ …………………………………………………………………………………2′=1a a -- ……………………………………………………………………………………2′第21题=1-. ………………………………………………………………………………………2′20.2224,(1)2 1.(2)x y x xy y +=⎧⎨-+=⎩解:由(2)式得到:2()1x y -=,…………………………………………………………………………1′再得到1x y -=或者1x y -=-,……………………………………………………………1′与(1)式组成方程组:24,1.x y x y +=⎧⎨-=⎩或24,1.x y x y +=⎧⎨-=-⎩……………………………………………3′ 解得:112,1.x y =⎧⎨=⎩,222,35.3x y ⎧=⎪⎪⎨⎪=⎪⎩……………………………………………………………………4′ 经检验,原方程组的解是:112,1.x y =⎧⎨=⎩,222,35.3x y ⎧=⎪⎪⎨⎪=⎪⎩……………………………………………1′ 21.解:(1)∵四边形ABCD 是平行四边形,∴AB=CD=m ,AB ∥CD . ………………………………2′∵CG =12BC , ∴CG =13BG ,………………………………………………1′∵AB ∥CD ,∴CF CGAB BG=.…………………………………………………………………………………1′ ∴13CF m =, …………………………………………………………………………………1′ ∴23DF m =.…………………………………………………………………………………1′ (2)∵AB ∥CD ,∴△ABE ∽△FDE ,………………………………………………………………………………2′∴239()24ABE FDE S S ∆∆==. …………………………………………………………………………2′∴ 三角形ABE 与三角形FDE 的面积之比为9∶4.22.证明:(1) ∵AB=AC ,AD 是∠BAC 的平分线,∴AD ⊥BC , ………………………………………1′ ∴∠ADC =90°. ∵AD 是∠BAC 的平分线,∴∠1=12∠BAC ,…………………………………1′同理:∠2=12∠MAC .…………………………………1′∵∠BAC +∠MAC=180°. ∴∠1+∠2=90°.即∠EAD =90°. …………………………………1′ ∵CE ⊥AN ,∴∠AEC =90°. …………………………………1′A CD EM N第22题12∴四边形ADCE 是矩形.…………………………1′(2)当△ABC 是等腰直角三角形时,四边形ADCE 是一个正方形.……………………………1′ 证明:∵∠BAC =90°,AB=AC ,AD 是∠BAC 的平分线,∴AD 是斜边BC 上的中线,∴AD=DC .……………………………………………………………………………………1′ ∵四边形ADCE 是矩形, …………………………………………………………………1′∴四边形ADCE 是正方形.…………………………………………………………………1′23.解:(1)见右,每个数1分,共8分; (2) 3;…………………………………………2′ (3)120.…………………………………………2′24.解:(1)过点A 作AE ⊥x 轴,垂足为点E . (1)∵点A 的坐标为(2,2),∴点E 的坐标为(2,0).……………………1组别 分 组频数 频率1 0.5—50.5 102 50.5—100.53 100.5—150.5 250.25 4 150.5—200.50.3 5 200.5—250.50.1 6250.5—300.50.05 合 计 1001∵AB=AC ,BC =8,∴BE=CE , ……………………………………1′ 点B 的坐标为(-2,0), ……………………1′ 点C 的坐标为(6,0).………………………1′设直线AC 的解析式为:y kx b =+(0k ≠), 将点A 、C 的坐标代入解析式,得到: 132y x =-+.………………………1′ ∴点D 的坐标为(0,3). …………………1′(2)设二次函数解析式为:2y ax bx c =++(0a ≠), ∵ 图象经过B 、D 、A 三点,∴4230,423 2.a b a b -+=⎧⎨++=⎩…………………………………………………………………2′解得:1,21.2a b ⎧=-⎪⎪⎨⎪=⎪⎩………………………………………………………1′∴此二次函数解析式为:211322y x x =-++. ………………………1′ 顶点坐标为(12,138). ………………………………………………1′25.(1)解:联接EO ,过点O 作OH ⊥BA 于点H . ………………2′∵EF =23,∴EH =3.………………………………1′∵⊙O 的半径为2,即EO =2,∴OH=1. …………………………………………………1′在Rt △BOH 中,DCFABO第25题 E GH∵Sin∠ABC=13,………………………………………1′∴BO=3.…………………………………………………1′(2)当⊙P与直线相切时,过点P的半径垂直此直线.…………………………………………1′(a)当⊙P与⊙O外切时,①⊙P与⊙O切于点D时,⊙P与射线BA相切,…………………………………………………1′Sin∠ABC=113PPrr=-,得到:14Pr=;………………………………1′②⊙P与⊙O切于点G时,⊙P与射线BA相切,Sin∠ABC =133PPrr=+,得到:52Pr=. ………………………………1′(b) 当⊙P与⊙O内切时,①⊙P与⊙O切于点D时,⊙P与射线BA相切,……………………………1′Sin∠ABC =113PPrr=+,得到:12Pr=;………………………………1′②⊙P与⊙O切于点G时,⊙P与射线BA相切,Sin∠ABC =153PPrr=-,得到:54Pr=. ………………………………1′综上所述:满足条件的⊙P的半径为14、52、12、54.……………………1′11 / 11。

精选上海市普陀区中考数学一模试卷(有详细答案)

精选上海市普陀区中考数学一模试卷(有详细答案)

上海市普陀区中考数学一模试卷一、选择题:(本大题共6题,每题4分,满分24分)1.如图,BD、CE相交于点A,下列条件中,能推得DE∥BC的条件是()A.AE:EC=AD:DB B.AD:AB=DE:BC C.AD:DE=AB:BC D.BD:AB=AC:EC2.如图,在△ABC中,D是AB的中点,DE∥BC,若△ADE的面积为3,则△ABC的面积为()A.3 B.6 C.9 D.123.如图,在Rt△ABC中,∠C=90°,CD是斜边AB上的高,下列线段的比值不等于cosA的值的是()A.B.C.D.4.如果a、b同号,那么二次函数y=ax2+bx+1的大致图象是()A.B.C.D.5.下列命题中,正确的是()A.圆心角相等,所对的弦的弦心距相等B.三点确定一个圆C.平分弦的直径垂直于弦,并且平分弦所对的弧D.弦的垂直平分线必经过圆心6.已知在平行四边形ABCD中,点M、N分别是边BC、CD的中点,如果=, =,那么向量关于、的分解式是()A.﹣B.﹣+C. +D.﹣﹣二、填空题:(本大题共12题,每题4分,满分48分)7.如果,那么= .8.计算:2(+)+(﹣)= .9.计算:sin245°+cot30°•tan60°= .10.已知点P把线段分割成AP和PB两段(AP>PB),如果AP是AB和PB的比例中项,那么AP:AB的值等于.11.在函数①y=ax2+bx+c,②y=(x﹣1)2﹣x2,③y=5x2﹣,④y=﹣x2+2中,y关于x的二次函数是.(填写序号)12.二次函数y=x2+2x﹣3的图象有最点.(填:“高”或“低”)13.如果抛物线y=2x2+mx+n的顶点坐标为(1,3),那么m+n的值等于.14.如图,点G为△ABC的重心,DE经过点G,DE∥AC,EF∥AB,如果DE的长是4,那么CF的长是.15.半圆形纸片的半径为1cm,用如图所示的方法将纸片对折,使对折后半圆弧的中点M与圆心O重合,则折痕CD的长为cm.16.已知在Rt△ABC中,∠C=90°,点P、Q分别在边AB、AC上,AC=4,BC=AQ=3,如果△APQ与△ABC相似,那么AP的长等于.17.某货站用传送带传送货物,为了提高传送过程的安全性,工人师傅将原坡角为45°的传送带AB,调整为坡度i=1:的新传送带AC(如图所示).已知原传送带AB的长是4米.那么新传送带AC的长是米.18.已知A(3,2)是平面直角坐标中的一点,点B是x轴负半轴上一动点,联结AB,并以AB为边在x轴上方作矩形ABCD,且满足BC:AB=1:2,设点C的横坐标是a,如果用含a的代数式表示D点的坐标,那么D点的坐标是.三、解答题:(本大题共7题,满分78分)19.已知:如图,在梯形ABCD中,AD∥BC,AD=,点M是边BC的中点=, =(1)填空: = , = (结果用、表示)(2)直接在图中画出向量2+.(不要求写作法,但要指出图中表示结论的向量)20.将抛物线y=先向上平移2个单位,再向左平移m(m>0)个单位,所得新抛物线经过点(﹣1,4),求新抛物线的表达式及新抛物线与y轴交点的坐标.21.如图,已知AD是⊙O的直径,AB、BC是⊙O的弦,AD⊥BC,垂足是点E,BC=8,DE=2,求⊙O的半径长和sin∠BAD的值.22.已知:如图,有一块面积等于1200cm2的三角形纸片ABC,已知底边与底边BC上的高的和为100cm(底边BC大于底边上的高),要把它加工成一个正方形纸片,使正方形的一边EF在边BC上,顶点D、G分别在边AB、AC上,求加工成的正方形铁片DEFG的边长.23.已知,如图,在四边形ABCD中,∠ADB=∠ACB,延长AD、BC相交于点E.求证:(1)△ACE∽△BDE;(2)BE•DC=AB•DE.24.已知,如图,在平面直角坐标系xOy中,二次函数y=ax2﹣的图象经过点、A(0,8)、B(6,2)、C(9,m),延长AC交x轴于点D.(1)求这个二次函数的解析式及的m值;(2)求∠ADO的余切值;(3)过点B的直线分别与y轴的正半轴、x轴、线段AD交于点P(点A的上方)、M、Q,使以点P、A、Q 为顶点的三角形与△MDQ相似,求此时点P的坐标.25.如图,已知锐角∠MBN的正切值等于3,△PBD中,∠BDP=90°,点D在∠MBN的边BN上,点P在∠MBN 内,PD=3,BD=9,直线l经过点P,并绕点P旋转,交射线BM于点A,交射线DN于点C,设=x(1)求x=2时,点A到BN的距离;(2)设△ABC的面积为y,求y关于x的函数解析式,并写出函数的定义域;(3)当△ABC因l的旋转成为等腰三角形时,求x的值.上海市普陀区中考数学一模试卷参考答案与试题解析一、选择题:(本大题共6题,每题4分,满分24分)1.如图,BD、CE相交于点A,下列条件中,能推得DE∥BC的条件是()A.AE:EC=AD:DB B.AD:AB=DE:BC C.AD:DE=AB:BC D.BD:AB=AC:EC【考点】平行线分线段成比例.【分析】根据比例式看看能不能推出△ABC∽△ADE即可.【解答】解:A、∵AE:EC=AD:DB,∴=,∴都减去1得: =,∵∠BAC=∠EAD,∴△ABC∽△ADE,∴∠D=∠B,∴DE∥BC,故本选项正确;B、根据AD:AB=DE:BC不能推出△ABC∽△ADE,即不能得出内错角相等,不能推出DE∥BC,故本选项错误;C、根据AD:DE=AB:BC不能推出△ABC∽△ADE,即不能得出内错角相等,不能推出DE∥BC,故本选项错误;D、根据BD:AB=AC:EC不能推出△ABC∽△ADE,即不能得出内错角相等,不能推出DE∥BC,故本选项错误;故选A.【点评】本题考查了平行线分线段成比例定理的应用,能理解平行线分线段成比例定理的内容是解此题的关键.2.如图,在△ABC中,D是AB的中点,DE∥BC,若△ADE的面积为3,则△ABC的面积为()A.3 B.6 C.9 D.12【考点】相似三角形的判定与性质;三角形中位线定理.【分析】由平行可知△ADE∽△ABC,且=,再利用三角形的面积比等于相似比的平方可求得△ABC的面积.【解答】解:∵DE∥BC,∴△ADE∽△ABC,∵D是AB的中点,∴=,∴=()2=,且S△=3,ADE∴=,∴S△=12,ABC故选D.【点评】本题主要考查相似三角形的判定和性质,掌握相似三角形的面积比等于相似比的平方是解题的关键.3.如图,在Rt△ABC中,∠C=90°,CD是斜边AB上的高,下列线段的比值不等于cosA的值的是()A.B.C.D.【考点】锐角三角函数的定义.【分析】根据余角的性质,可得∠=∠BCD,根据余弦等于邻边比斜边,可得答案.【解答】解:A、在Rt△ABD中,cosA=,故A正确;B、在Rt△ABC中,cosA=,故B正确C、在Rt△BCD中,cosA=cos∠BCD=,故C错误;D、在Rt△BCD中,cosA=cos∠BCD=,故D正确;故选:C.【点评】本题考查了锐角三角函数的定义,在直角三角形中,锐角的正弦为对边比斜边,余弦为邻边比斜边,正切为对边比邻边.4.如果a、b同号,那么二次函数y=ax2+bx+1的大致图象是()A.B.C.D.【考点】二次函数的图象.【分析】分a>0和a<0两种情况根据二次函数图象的开口方向、对称轴、与y轴的交点情况分析判断即可得解.【解答】解:a>0,b>0时,抛物线开口向上,对称轴x=﹣<0,在y轴左边,与y轴正半轴相交,a<0,b<0时,抛物线开口向下,对称轴x=﹣<0,在y轴左边,与y轴正半轴坐标轴相交,D选项符合.故选D.【点评】本题考查了二次函数图象,熟练掌握函数图象与系数的关系是解题的关键,注意分情况讨论.5.下列命题中,正确的是()A.圆心角相等,所对的弦的弦心距相等B.三点确定一个圆C.平分弦的直径垂直于弦,并且平分弦所对的弧D.弦的垂直平分线必经过圆心【考点】命题与定理.【分析】根据有关性质和定理分别对每一项进行判断即可.【解答】解:A、在同圆或等圆中,相等的圆心角所对的弦相等,故本选项错误;B、不在一条直线上的三点确定一个圆,错误;C、平分弦的直径不一定垂直于弦,错误;D、弦的垂直平分线必经过圆心,正确;故选D【点评】此题考查了命题与定理,关键是熟练掌握有关性质和定理,能对命题的真假进行判断.6.已知在平行四边形ABCD中,点M、N分别是边BC、CD的中点,如果=, =,那么向量关于、的分解式是()A.﹣B.﹣+C. +D.﹣﹣【考点】*平面向量.【分析】首先根据题意画出图形,然后连接BD,由三角形法则,求得,又由点M、N分别是边BC、CD的中点,根据三角形中位线的性质,即可求得答案.【解答】解:如图,连接BD,∵在平行四边形ABCD中, =, =,∴=﹣=﹣,∵点M、N分别是边BC、CD的中点,∴MN∥BD,MN=BD,∴==(﹣)=﹣+.故选B.【点评】此题考查了平面向量的知识以及三角形的中位线的性质.注意结合题意画出图形,利用图形求解是关键.二、填空题:(本大题共12题,每题4分,满分48分)7.如果,那么= .【考点】比例的性质.【分析】根据比例设x=2k,y=5k,然后代入比例式进行计算即可得解.【解答】解:∵ =,∴设x=2k,y=5k,则===.故答案为:.【点评】本题考查了比例的性质,利用“设k法”表示出x、y可以使计算更加简便.8.计算:2(+)+(﹣)= 3+.【考点】*平面向量.【分析】直接利用平面向量的加减运算法则求解即可求得答案.【解答】解:2(+)+(﹣)=2+2+﹣=3+.故答案为:3+.【点评】此题考查了平面向量的知识.注意掌握去括号法则.9.计算:sin245°+cot30°•tan60°= .【考点】特殊角的三角函数值.【分析】直接利用特殊角的三角函数值代入求出答案.【解答】解:原式=sin245°+cot30°•tan60°=()2+×=.故答案为:.【点评】此题主要考查了特殊角的三角函数值,正确记忆相关数据是解题关键.10.已知点P把线段分割成AP和PB两段(AP>PB),如果AP是AB和PB的比例中项,那么AP:AB的值等于.【考点】黄金分割.【分析】根据黄金分割的概念和黄金比是解答即可.【解答】解:∵点P把线段分割成AP和PB两段(AP>PB),AP是AB和PB的比例中项,∴点P是线段AB的黄金分割点,∴AP:AB=,故答案为:.【点评】本题考查的是黄金分割的概念,把一条线段分成两部分,使其中较长的线段为全线段与较短线段的比例中项,这样的线段分割叫做黄金分割,他们的比值叫做黄金比.11.在函数①y=ax2+bx+c,②y=(x﹣1)2﹣x2,③y=5x2﹣,④y=﹣x2+2中,y关于x的二次函数是④.(填写序号)【考点】二次函数的定义.【分析】根据形如y=ax2+bx+c(a≠0)是二次函数,可得答案.【解答】解:①a=0时y=ax2+bx+c是一次函数,②y=(x﹣1)2﹣x2是一次函数;③y=5x2﹣不是整式,不是二次函数;④y=﹣x2+2是二次函数,故答案为:④.【点评】本题考查了二次函数,形如y=ax2+bx+c(a≠0)是二次函数,注意二次项的系数不能为零.12.二次函数y=x2+2x﹣3的图象有最低点.(填:“高”或“低”)【考点】二次函数的最值.【分析】直接利用二次函数的性质结合其开口方向得出答案.【解答】解:∵y=x2+2x﹣3,a=1>0,∴二次函数y=x2+2x﹣3的图象有最低点.故答案为:低.【点评】此题主要考查了二次函数的性质,得出二次函数的开口方向是解题关键.13.如果抛物线y=2x2+mx+n的顶点坐标为(1,3),那么m+n的值等于 1 .【考点】二次函数的性质.【专题】推理填空题.【分析】根据抛物线y=2x2+mx+n的顶点坐标为(1,3),可知,从而可以得到m、n的值,进而可以得到m+n的值.【解答】解:∵抛物线y=2x2+mx+n的顶点坐标为(1,3),∴,解得m=﹣4,n=5,∴m+n=﹣4+5=1.故答案为:1.【点评】本题考查二次函数的性质,解题的关键是明确二次函数的顶点坐标公式.14.如图,点G为△ABC的重心,DE经过点G,DE∥AC,EF∥AB,如果DE的长是4,那么CF的长是 2 .【考点】三角形的重心.【分析】连接BD并延长交AC于H,根据重心的性质得到=,根据相似三角形的性质求出AC,根据平行四边形的判定和性质求出AF,计算即可.【解答】解:连接BD并延长交AC于H,∵点G为△ABC的重心,∴=,∵DE∥AC,∴△BDE∽△BAC,∴==,又DE=4,∴AC=6,∵DE∥AC,EF∥AB,∴四边形ADEF是平行四边形,∴AF=DE=4,∴CF=AC﹣AF=2,故答案为:2.【点评】此题考查了重心的概念和性质:三角形的重心是三角形三条中线的交点,且重心到顶点的距离是它到对边中点的距离的2倍.15.半圆形纸片的半径为1cm,用如图所示的方法将纸片对折,使对折后半圆弧的中点M与圆心O重合,则折痕CD的长为cm.【考点】垂径定理;勾股定理.【分析】作MO交CD于E,则MO⊥CD.连接CO.根据勾股定理和垂径定理求解.【解答】解:作MO交CD于E,则MO⊥CD,连接CO,对折后半圆弧的中点M与圆心O重合,则ME=OE=OC,在直角三角形COE中,CE==,折痕CD的长为2×=(cm).【点评】作出辅助线,构造直角三角形,根据对称性,利用勾股定理解答.16.已知在Rt△ABC中,∠C=90°,点P、Q分别在边AB、AC上,AC=4,BC=AQ=3,如果△APQ与△ABC相似,那么AP的长等于或.【考点】相似三角形的性质.【分析】根据勾股定理求出AB的长,根据相似三角形的性质列出比例式解答即可.【解答】解:∵AC=4,BC=3,∠C=90°,∴AB==5,当△APQ∽△ABC时,=,即=,解得,AP=;当△APQ∽△ACB时,=,即,解得,AP=,故答案为:或.【点评】本题考查的是相似三角形的性质,掌握相似三角形的对应边的比相等、正确运用分情况讨论思想是解题的关键.17.某货站用传送带传送货物,为了提高传送过程的安全性,工人师傅将原坡角为45°的传送带AB,调整为坡度i=1:的新传送带AC(如图所示).已知原传送带AB的长是4米.那么新传送带AC的长是8 米.【考点】解直角三角形的应用-坡度坡角问题.【分析】根据题意首先得出AD,BD的长,再利用坡角的定义得出DC的长,再结合勾股定理得出答案.【解答】解:过点A作AD⊥CB延长线于点D,∵∠ABD=45°,∴AD=BD,∵AB=4,∴AD=BD=ABsin45°=4×=4,∵坡度i=1:,∴==,则DC=4,故AC==8(m).故答案为:8.【点评】此题主要考查了勾股定理以及解直角三角形的应用等知识,正确得出DC,AD的长是解题关键.18.已知A(3,2)是平面直角坐标中的一点,点B是x轴负半轴上一动点,联结AB,并以AB为边在x轴上方作矩形ABCD,且满足BC:AB=1:2,设点C的横坐标是a,如果用含a的代数式表示D点的坐标,那么D点的坐标是(2,).【考点】相似三角形的判定与性质;坐标与图形性质.【分析】如图,过C作CH⊥x轴于H,过A作AF⊥x轴于F,AG⊥y轴于G,过D作DE⊥AG于E,于是得到∠CHB=∠AFO=∠AED=90°,根据余角的性质得到∠DAE=∠FAB,推出△BCH∽△ABF,根据相似三角形的性质得到,求得BH=AF=1,CH=BF=,通过△BCH≌△ADE,得到AE=BH=1,DE=CH=,求得EG=3﹣1=2,于是得到结论.【解答】解:如图,过C作CH⊥x轴于H,过A作AF⊥x轴于F,AG⊥y轴于G,过D作DE⊥AG于E,∴∠CHB=∠AFO=∠AED=90°,∴∠GAF=90°,∴∠DAE=∠FAB,∵四边形ABCD是矩形,∴∠ABC=90°,∴∠BCH=∠ABF,∴△BCH∽△ABF,∴,∵A(3,2),∴AF=2,AG=3,∵点C的横坐标是a,∴OH=﹣a,∵BC:AB=1:2,∴BH=AF=1,CH=BF=,∵△BCH∽△ABF,∴∠HBC=∠DAE,在△BCH与△ADE中,,∴△BCH≌△ADE,∴AE=BH=1,DE=CH=,∴EG=3﹣1=2,∴D(2,).故答案为:(2,).【点评】本题考查了相似三角形的判定和性质,坐标与图形的性质,全等三角形的判定和性质,矩形的性质,正确的画出图形是解题的关键.三、解答题:(本大题共7题,满分78分)19.已知:如图,在梯形ABCD中,AD∥BC,AD=,点M是边BC的中点=, =(1)填空: = , = ﹣﹣(结果用、表示)(2)直接在图中画出向量2+.(不要求写作法,但要指出图中表示结论的向量)【考点】*平面向量.【分析】(1)由在梯形ABCD中,AD∥BC,AD=,可求得,然后由点M是边BC的中点,求得,再利用三角形法则求解即可求得;(2)首先过点A作AE∥CD,交BC于点E,易得四边形AECD是平行四边形,即可求得=2,即可知=2+.【解答】解:(1)∵在梯形ABCD中,AD∥BC,AD=, =,∴=3=3,∵点M是边BC的中点,∴==;∴=﹣=﹣(+)=﹣﹣;故答案为:,﹣﹣;(2)过点A作AE∥CD,交BC于点E,∵AD∥BC,∴四边形AECD是平行四边形,∴==,∴=﹣=2,∴=+=2+.【点评】此题考查了平面向量的知识以及平行四边形的性质.注意掌握平行四边形法则与三角形法则的应用是解此题的关键.20.将抛物线y=先向上平移2个单位,再向左平移m(m>0)个单位,所得新抛物线经过点(﹣1,4),求新抛物线的表达式及新抛物线与y轴交点的坐标.【考点】二次函数图象与几何变换.【分析】利用二次函数平移的性质得出平移后解析式,进而利用x=0时求出新抛物线与y轴交点的坐标.【解答】解:由题意可得:y=(x+m)2+2,代入(﹣1,4),解得:m1=3,m2=﹣1(舍去),故新抛物线的解析式为:y=(x+3)2+2,当x=0时,y=,即与y轴交点坐标为:(0,).【点评】此题主要考查了二次函数图象与几何变换,正确利用二次函数平移的性质得出解析式是解题关键.21.如图,已知AD是⊙O的直径,AB、BC是⊙O的弦,AD⊥BC,垂足是点E,BC=8,DE=2,求⊙O的半径长和sin∠BAD的值.【考点】垂径定理;解直角三角形.【分析】设⊙O的半径为r,根据垂径定理求出BE=CE=BC=4,∠AEB=90°,在Rt△OEB中,由勾股定理得出r2=42+(r﹣2)2,求出r.求出AE,在Rt△AEB中,由勾股定理求出AB,解直角三角形求出即可.【解答】解:设⊙O的半径为r,∵直径AD⊥BC,∴BE=CE=BC==4,∠AEB=90°,在Rt△OEB中,由勾股定理得:OB2=0E2+BE2,即r2=42+(r﹣2)2,解得:r=5,即⊙O的半径长为5,∴AE=5+3=8,∵在Rt△AEB中,由勾股定理得:AB==4,∴sin∠BAD===.【点评】本题考查了垂径定理,勾股定理,解直角三角形的应用,能根据垂径定理求出BE是解此题的关键.22.已知:如图,有一块面积等于1200cm2的三角形纸片ABC,已知底边与底边BC上的高的和为100cm(底边BC大于底边上的高),要把它加工成一个正方形纸片,使正方形的一边EF在边BC上,顶点D、G分别在边AB、AC上,求加工成的正方形铁片DEFG的边长.【考点】相似三角形的应用.【分析】作AM⊥BC于M,交DG于N,设BC=acm,BC边上的高为hcm,DG=DE=xcm,根据题意得出方程组求出BC和AM,再由平行线得出△ADG∽△ABC,由相似三角形对应高的比等于相似比得出比例式,即可得出结果.【解答】解:作AM⊥BC于M,交DG于N,如图所示:设BC=acm,BC边上的高为hcm,DG=DE=xcm,根据题意得:,解得:,或(不合题意,舍去),∴BC=60cm,AM=h=40cm,∵DG∥BC,∴△ADG∽△ABC,∴,即,解得:x=24,即加工成的正方形铁片DEFG的边长为24cm.【点评】本题考查了方程组的解法、相似三角形的运用;熟练掌握方程组的解法,证明三角形相似得出比例式是解决问题的关键.23.已知,如图,在四边形ABCD中,∠ADB=∠ACB,延长AD、BC相交于点E.求证:(1)△ACE∽△BDE;(2)BE•DC=AB•DE.【考点】相似三角形的判定与性质.【专题】证明题.【分析】(1)根据邻补角的定义得到∠BDE=∠ACE,即可得到结论;(2)根据相似三角形的性质得到,由于∠E=∠E,得到△ECD∽△EAB,由相似三角形的性质得到,等量代换得到,即可得到结论.【解答】证明:(1)∵∠ADB=∠ACB,∴∠BDE=∠ACE,∴△ACE∽△BDE;(2)∵△ACE∽△BDE,∴,∵∠E=∠E,∴△ECD∽△EAB,∴,∴,∴BE•DC=AB•DE.【点评】本题考查了相似三角形的判定和性质,邻补角的定义,熟练掌握相似三角形的判定和性质是解题的关键.24.已知,如图,在平面直角坐标系xOy中,二次函数y=ax2﹣的图象经过点、A(0,8)、B(6,2)、C(9,m),延长AC交x轴于点D.(1)求这个二次函数的解析式及的m值;(2)求∠ADO的余切值;(3)过点B的直线分别与y轴的正半轴、x轴、线段AD交于点P(点A的上方)、M、Q,使以点P、A、Q 为顶点的三角形与△MDQ相似,求此时点P的坐标.【考点】二次函数综合题.【分析】(1)把点A、B的坐标代入函数解析式求得系数a、c的值,从而得到函数解析式,然后把点C的坐标代入来求m的值;(2)由点A、C的坐标求得直线AC的解析式,然后根据直线与坐标轴的交点的求法得到点D的坐标,所以结合锐角三角函数的定义解答即可;(3)根据相似三角形的对应角相等进行解答.【解答】解:(1)把A(0,8)、B(6,2)代入y=ax2﹣,得,解得,故该二次函数解析式为:y=x2﹣x+8.把C(9,m),代入y=x2﹣x+8得到:m=y=×92﹣×9+8=5,即m=5.综上所述,该二次函数解析式为y=x2﹣x+8,m的值是5;(2)由(1)知,点C的坐标为:(9,5),又由点A的坐标为(0,8),所以直线AC的解析式为:y=﹣x+8,令y=0,则0=﹣x+8,解得x=24,即OD=24,所以cot∠ADO===3,即cot∠ADO=3;(3)在△APQ与△MDQ中,∠AQP=∠MQD.要使△APQ与△MDQ相似,则∠APQ=∠MDQ或∠APQ=∠DMQ(根据题意,这种情况不可能),∴cot∠APQ=cot∠MDQ=3.作BH⊥y轴于点H,在直角△PBH中,cot∠P==3,∴PH=18,OP=20,∴点P的坐标是(0,20).【点评】本题是二次函数的综合题型,其中涉及到的知识点有待定系数法求二次函数、一次函数解析式,相似三角形的判定与性质,锐角三角函数的定义.在求有关动点问题时要注意分析题意分情况讨论结果.25.如图,已知锐角∠MBN的正切值等于3,△PBD中,∠BDP=90°,点D在∠MBN的边BN上,点P在∠MBN 内,PD=3,BD=9,直线l经过点P,并绕点P旋转,交射线BM于点A,交射线DN于点C,设=x(1)求x=2时,点A到BN的距离;(2)设△ABC的面积为y,求y关于x的函数解析式,并写出函数的定义域;(3)当△ABC因l的旋转成为等腰三角形时,求x的值.【考点】几何变换综合题.【分析】(1)由PD∥AH得到=2,即可;(2)由PD∥AH得到,再由tan∠MBN=3,比例式表示出BC,CD,即可;(3)△ABC为等腰三角形时,分三种情况①AB=AC,②CB=CA,③BC=BA利用tan∠MBN=3,建立方程即可.【解答】解:(1)如图1,过点A作AH⊥BC,∵PD⊥BC,∴PD∥AH,∴=2,∴AH=2PD=6,(2)∵PD∥AH,∴=x,....∴AH=PD×x=3x,∵tan∠MBN=3,∴BH=3,∵,∴,∴CD=,∴BC=BD+CD=9+=,∴S△=AH×BC=×3x×=,ABC∴y=(1<x≤9),(3)①当AB=AC时,∵tan∠PCB=tan∠MBC=3,∴=3,∴CD=1,∴BC=BD+CD=10,∴=10,∴x=5,②当CB=CA时,如图2,过点C作CE⊥AB,BE=AB=x,∵tan∠MBN=3,∴cos∠MBN=,....∴=,∴,∴x=;③当BA=BC时, x=,∴x=1+,∴△ABC为等腰三角形时,x=5或或1+.【点评】此题是几何变换的综合题,主要考查平行线分线段成比例定理和锐角三角函数,由平行线分线段成比例定理建立方程是解本题的关键.。

2024年普陀区高三一模语文试卷及答案

2024年普陀区高三一模语文试卷及答案

2023学年度普陀区高三年级第一次质量调研(语文试卷)2023.12考生注意:1.试卷满分为150分,其中阅读部分80分,写作部分70分,考试时间为150分钟。

2.学生答题全部做在答题纸上。

3.答题纸与试卷在试题编号上是一一对应的,答题时应特别注意,不能错位。

一积累运用(10分)1.按题目要求填空。

(5分)(1)试使山东之国与陈涉度长絜大,比权量力,。

(贾谊《过秦论》)(2),天下归心。

(曹操《》)。

(3)《赤壁赋》中描写了月出之前苏轼与客泛舟游赤壁所见到的景象,即“,”。

2.按题目要求选择。

(5分)(1)将下列编号的语句依次填入语段空白处,语意连贯的一项是()。

(2分)进行文献筛选,,。

研究者通过初步浏览,;然后,从中提取出自身课题研究所需要的信息。

①对搜索来的文献的价值进行评估、分类并筛选②是为了根据课题研究的目标和内容③对筛选出来的、具有较高价值的文献进行精读④选择符合要求的文献类型和文献篇目A.④②①③B.③①②④C.②④①③D.①③②④(2)小明将代表校文学社,和社团特邀嘉宾王教授进行微信沟通,以下是他草拟的一部分内容,其中有一处画线部分语言表达不得体,请帮他找出并修改。

(3分)王教授您好!很抱歉,【甲】之前邀请您下周六光临我校,【乙】为我们文学社成员指点迷津,【丙】现在因为和市级辩论赛时间冲突,【丁】我们决定把这个活动推迟到下个月,特此通知。

……二阅读(70分)第1章搭设创新的舞台(节选)①本书的主题是创造力,开篇描述了什么是创造力,然后回顾了历史上富有创造力的人们工作和生活的方式,最后,你将明白如何才能让我们的生活与这些富有创造力的人的生活更接近。

②创造力是我们生活意义的核心来源。

第一,大多数有趣的、重要的、人性化的事情都来自创造力。

我们的基因构成中有98%与黑猩猩相同,但语言、价值观、艺术表达、对科学的理解以及对技术的研究让我们与众不同,它们都是个体创造力的结果。

这种创造力受到认可和奖励,并通过学习得以传递。

上海市普陀区2009-2010学年度初三语文第一学期期末质量抽查试卷

上海市普陀区2009-2010学年度初三语文第一学期期末质量抽查试卷

2009-2010年普陀区中考一模试卷(满分150分时间100分钟)考生注意:本卷共有28题。

请将所有答案写在答卷上,写在试卷上不给分。

第一部分阅读(90分)一、积累与运用(共25分)(一)默写(15分)1.出师一表真名世,_____________________ 。

《书愤》2.人生自古谁无死,_____________________。

《过零丁洋》3. _____________________,随君直到夜郎西。

《闻王昌龄左迁龙票遥有此寄》4.子曰:“学而不思则罔,_____________________。

”《孔孟论学》5.山行六七里,_____________________,酿泉也。

《醉翁亭记》(二)基础知识(10分)6.(2分)下列句子中没有错别字的一项是()A.红色是热情的色采,它强烈,奔放,令人精神振奋。

B.当遇到重大问题需要他拿语音的时候,它反倒迟疑不绝了。

C.今年春节期间,各地电视台的文艺节目多得令人目不暇接。

D.北京办奥运,既展示传统文化又展示精神风貌,可谓两全齐美。

7.(2分)加点字注意错误的一项是()A.鉴(jiàn)定真伪B.醋(hān)然入梦C.河流干涸(hé)D.头晕目眩(xiàn)8.(2分)依次填入下列句子横线处的词语,最恰当的一项是()①政府工作会议就促进社会和谐稳定、完美为民办实事等重要工作作了周密的_____。

②学校正积极________运动会,各项工作了明确的分工。

③如果缺少科学文化知识,就可能被伪科学所_________。

A.布置准备戏弄B.部署准备愚弄C.部署筹备愚弄D.布置筹备戏弄9.下面两段歌词有细微区别,较好的是(2分)___________。

理由是(2分):_______________________________________________________________________________ _________________________________________________________________________A.天山脚下是我可爱的家乡,当我离开它的时候,好像那哈密瓜,断了瓜秧;白杨树下住着我心爱的姑娘,当我和她分别后,好像那冬不拉,闲挂在墙上。

2010.1普陀区高三一模卷

2010.1普陀区高三一模卷

普陀区2009学年度高三年级第一次质量调研(语文试卷)2010.1考生注意:1.本试卷满分为150分,其中阅读部分80分,写作部分70分,考试时间为150分钟。

2.学生答题一律使用0.5毫米黑色水笔,答案全部做在答题纸上。

3.答题纸与试卷在试题编号上是一一对应的,答题时应特别注意,不能错位。

阅读部分(80分)一.阅读下面的文章,完成1—6题(16分)平民、平民文学和平民利益吴俊(1)“平民”这个词或概念,在中外古今的使用及其沿革的过程中,都是有过一些变化的。

在当下的使用和语境中,它一般指的就是社会中的普通人。

从这个简单界定里,我们可以将它作进一步的具体说明。

觉得“平民”这个词或概念,至少指涉或包括了以下几种重要而且是基本的特质或属性。

首先它是指社会中的绝大多数人,即代表了社会利益的主体,或体现了主要的社会利益之所在。

在此意义上,平民利益也就是社会公共利益。

第二它是指社会中最基本的人群,即社会阶层中的基层(包括底层)部分。

第三它是社会财富(包括物质的和精神的)最直接的创造者,同时也是最广大的消费者。

第四平民也是一个集合、集群性概念,它有着最基本的利益一致性,同时也表现出多面、多层、多元的利益诉求,其价值观并非是完全单一或同一的。

(2)由这几点,我们很容易就能获得以下认识,即平民利益的充分保证或保障与否,是任何一种社会臸度、社会形态和社会臺序公正、合理与道德的标志。

在常态社会中是如此,在转型社会中也是如此。

我们可以根据平民利益的得失,衡量、判断社会演变的性质,或发现社会演变中的重大问题。

(3)中国文学,不管在古代还是现当代,都有着十分鲜明而强大的“平民传统....”。

甚至可以说,“平民文学”参与开创了中国古代文学和现当代文学的基本传统或主流传统。

(4)从中国古代文学来说,《诗经》里风、雅、颂三体中的“风”(《国风》),即可称是我们现在所知的当时最近于平民情感、平民意识和平民观念的平民文学,虽然据说它经过了孔子的“删定”。

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2009学年度第一学期普陀区高三英语质量调研卷 2010-1-12第Ⅰ卷(共105分)I.Listening ComprehensionSection ADirections: In Section A; you will hear ten short conversations between two speakers. At the end of each conversation, a question will be asked about what was said. The conversations and the questions will be spoken only once. After you hear a conversation and the question about it, read the four possible answers on your paper, and decide which one is the best answer to the question you have heard.1. A. In a hotel. B. At a dinner table. C. In the street. D. At the man’s house.2. A. France. B. Britain. C. Germany. D. Spain.3. A. A writer. B. A teacher. C. A reporter. D. A student.4. A. Librarian and students. B. Operator and caller.C. Boss and secretary.D. Customer and repairman.5. A. Five lessons. B. Three lessons. C. Twelve lessons. D. Fifteen lessons.6. A. The man is planning a trip to Austin. B. The man has not been to Austin before.C. The man doesn’t like Austin.D. The man has been to Austin before.7. A. Find a larger room. B. Sell the old table.C. Buy two bookshelves.D. Rearrange some furniture.8. A. The choice of courses. B. A day course.C. An evening course.D. Their work.9. A. It was a long lecture, but easy to understand.B. It was not as easy as she had expected.C. It was as difficult as she had expected.D. It was interesting and easy to follow.10. A. She felt it was tiring. B. She felt it was very nice.C. She felt it took less time.D. She thought it was expensive.Section BDirections: In Section B, you will hear two short passages, and you will be asked to questions on each of the passages. The passages will be read twice, but the questions will spoken only once. When you hear a question, read the four possible answers on your paper decide which one would be the blest answer to the question you have heard.Questions 11 through 13 are based on the following passage.11. A. Synthetic fuel. B. Solar energy. C. Alcohol. D. Electricity.12. A. Air traffic conditions. B. Traffic jams on highways.C. Road conditions.D. New traffic rules.13. A. Go through a health check. B. Take little luggage with them.C. Arrive early for boarding.D. Undergo(进行) security checks. Questions 14 through 16 are based on the following news.14. A. Industry. B. Agriculture. C. Public health. D. Environment.15. A. Three thousand million dollars. B. Three hundred million dollars.C. Thirty-two thousand million dollars.D. Twenty-three thousand million dollars.16. A. Production problems.B. Failure to use the right chemicals.C. the active chemicals are stronger than permitted by government.D. Both A and B.Section CDirections: In Section C, you will hear two longer conversations. The conversations will be read twice. After you hear each conversation, you are required to fill in the numbered blanks with the information you have heard. Write your answers on your answer sheet.Complete the form. Write NO MORE THAN THREE WORDS for each answer.II.Grammar and VocabularySection ADirections: Beneath each of the following sentences there are four choices marked A, B, C and D. Choose the one answer that best completes the sentence.25. I called Alice many times yesterday evening, but I couldn’t get through. Her brother _____ on the phone all the time!A. was talkingB. has been talkingC. has talkedD. talked26. We went right round to the west coast by _____ sea instead of driving across _____ continent.A. the; theB. /; theC. the; /D. /; /27. I hear they’ve promoted Tom, but he didn’t mention _____ when we talked on the phone.A. to promoteB. having been promotedC. having promotedD. to be promoted28. We had an anxious couple of weeks _____ for the results of the experiment.A. waitB. to be waitingC. waitedD. waiting29. The day we had been looking forward to _____ at last.A. comeB. cameC. comingD. be coming30. Was it in 1969 _____ the American astronaut succeeded _____ landing on the moon?A. when; onB. that; onC. that; inD. then; in31. Make sure you’ve got the passports and tickets and _____ before you leave.A. somethingB. anythingC. everythingD. nothing32. It was hard for him to learn English in a family, in which _____ of the parents spoke the language.A. noneB. neitherC. bothD. each33. The growing speed of a plant is influenced by a number of factors, _____ are beyond our control.A. most of themB. most of whichC. most of whatD. most of that34. The manager as well as the staff _____ chatting cheerfully during the tea break when the boss came in.A. wereB. have beenC. wasD. has been35. The companies are working together to create _____ they hope will be the best means of transport in the 21st century.A. whichB. thatC. whatD. who36. –What is it that made Obama happy?--_____ the US President.A. To electB. ElectingC. Being electedD. Having elected37. _____ the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.A. IfB. WhileC. BecauseD. As38. –Never before _____ so popular with the young people in China.--Yes. That’s because they are considered to be very useful as well as look fashionable.A. have mobile phones beenB. mobile phones have beenC. had mobile phones beenD. mobile phones had been39. _____ from being killed, the deer looked for a place where he could get food.A. To escapeB. EscapingC. Having escapedD. To have escaped40. After a thorough investigation, the policeman declared that the blow on the victim’s head _____ from behind.A. should have been madeB. must have been madeC. would have been madeD. ought to have been madeSection BDirections: Complete the following passage by using the words in the box. Each word can onlyTwo-thirds of U.S. consumers have yet to finish their holiday shopping, and 41 percent expect to finish at least a week prior to Christmas, according to a new survey.One-fourth of __41__ will be shopping the week leading into Christmas, __42__ Christmas Eve, according to the first annual American Express Spending and Saving Tracker research report."Actually, we found in this holiday season there is this game of watching and waiting ... that deals will get sweeter as the clock winds down," said Mona Hamouly, a spokeswoman for the report.Some 62 percent of consumers are waiting until the last minute to shop for the holiday. Thirty-one percent are waiting for the best deals before finishing their shopping, while about 20 percent plan to do so at the last minute because they are still saving or are busy, and one in 10 say they are waiting for that last pay __43__ before the holidays.Hamouly said consumers seem to be "managing their cash flow and seeking out those great deals" this year.Over the next 30 days, 65 percent of people expect to spend the same or more than they spent in the past 30 days and one-third __44__ to spend less, according to the survey prepared for American Express.Hamouly said the weak economy was a large factor in consumers' __45__ toward shopping, with many feeling cash-strapped.In addition to a __46__ sample of consumers, the survey targeted two sub-groups -- those designated as "affluents" and "young professionals."Affluents were __47__ as having a minimum __48__ household income of $100,000, while young professionals were those who were less than 30 years old, had a college degree and a minimum annual household income of $50,000.During the next 30 days, among consumers who expect to spend more, 56 percent say they will be spending the most on holiday gifts.More than 40 percent expect to spend less in the next month because they are trying to save money, the prices of goods have increased, or they want to maintain a __49__. One-third cite the need to reduce their debt."Even for the affluent population, they want to get the best deals too," Hamouly said.The two top items consumers will be buying over the next 30 days are groceries and holiday gifts.III.Reading ComprehensionSection ADirections: For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in each blank with the word or phrase that fits the context.The central problem of economics is to satisfy the people's and nation's wants.The problem we faced with is that our resources, here identified as money are __50__. The only way we can solve the problem is to make choices. After looking at our resources, we must examine our list of __51__ and identify the things we need immediately, those we can postpone, and __52__ we cannot afford. As individuals, we face the central problem involved in economics---deciding how to allocate(分配) our limited resources to provide __53__ with greatest satisfaction of our wants.Nations face the same problem. As a country's population __54__, the need for more goods and services grows correspondingly. Resources necessary to production may increase, but there are __55__ enough resources to satisfy the total desires of a nation. Whether the budget meeting is taking place in the family living room, in the conference room of the corporation __56__ of directors, or in the chamber of the House of Representatives in Washington, the basic problem stillexists. We need to find __57__ of allocating limited resources in order to satisfy unlimited wants.A short time ago, economists divided goods into two categories, free and economic. The former, like air and water, were in __58__ abundance(丰富) that economists had no concern for them. After all, economics is the __59__ of scarcity and what to do about it. Today many of these "free goods" are __60__ very expensive to use. Population has made clean air and water expensive for producers extra cost, and __61__ taxpayers who pay for the government's involvement in cleaning the environment.In the 1990s, almost all goods are __62__. Only by effort and money __63__ obtained in the from people wish.Meeting needs of people and the demands from resource available __64__ the basic activity of production. In trying to meet unlimited wants from limited economic goods, production leads to new problems in economics.50. A. limited B. unlimited C. scarcity D. abundant51. A. want B. problem C. wants D. resources52. A. those B. some C. others D. many53. A. them B. themselves C. ourselves D. ours54. A. expand B. extends C. grows D. increase55. A. always B. sometimes C. often D. never56. A. management B. function C. board D. group57. A. people B. economists C. way D. methods58. A. so B. great C. such D. such an59. A. form B. study C. means D. source60. A. possibly B. in practice C. in fact D. practically61. A. from B. at C. for D. with62. A. plentiful B. scarce C. abundant D. in full supply63. A. they can be B. can they be C. they must be D. must they be64. A. are led to B. leading to C. lead to D. leads toSection BDirections: Read the following three passages. Each passage is followed by several questions or unfinished statements. For each of them there are four choices marked A, B, C and D. Choose the one that fits best according to the information given in the passage you have just read.(A)Five years ago, David Smith wore an expensive suit to work every day. “I was a clothes addict,” jokes. “I used to carry a fresh suit to work with me so I could change if my clothes got wrinkled.” Today David wears casual clothes---khaki pants and sports shirt---to the office. He hardly ever wears necktie. “I’m working harder than ever,” David says, “and I need to feel comfortable.”More and more companies are allowing their office workers to wear casual clothes to work in the United States. The change from formal to casual office wear has been gradual. In the early 1990s, many companies allowed their employees to wear casual clothes on Friday (but only on Friday). This became known as “dress-down Friday” or “casual Friday.” “What started out as anextra one-day-a-week benefit for employees has really become an everyday thing,” said business consultant Maisly Jones.Why have so many companies started allowing their employees to wear casual clothes? One reason is that it’s easier for a company to attract new employees if it has a casual dress code. “A lot of young people don’t want to dress up for work,” says the owner of a software company, “so it’s hard to hire people if you have a conservative dress code.” Another reason is that people seem happier and more productive when they are wearing comfortable clothes. In a study conducted by Levi Strauss and Company, 85 percent of employers said that they believe that casual dress improves employee morale. Only 4 percent of employers said that casual dress has a negative impact on productive. Supporters of casual office wear also argue that a casual dress code helps them save money. “Suits are expensive, if you have to wear one every day,” one person said. “For the same amount of money, you can buy a lot more casual clothes.”65. David Smith refers to himself as having been “a clothes addict” because_______.A. he often wore khaki pants and a sports shirtB. he couldn’t stand a clean appearanceC. he wanted his clothes to look neat all the timeD. he didn’t want to spend much money on clothes66. David Smith wears casual clothes now, because________A. they make him feel at ease when workingB. he cannot afford to buy expensive clothesC. he looks handsome in casual clothesD. he no longer works for any company67. According to this passage, which of the following statements is FALSE?A. Many employees don’t like a conservative dress code.B. Comfortable clothes make employees more productiveC. A casual clothes code is welcomed by young employeesD. All the employers in the U.S are for casual office wear.68. In this passage, the following advantages of casual office wear are mentioned EXCEPT_______.A. saving employees’ moneyB. making employees more attractiveC. improving employees’ motivationD. making employees happier(B)How to protect children Web fans from unsuitable material on-line while encouraging them to use the Internet has long been discussed in the U.S.For some parents, the Internet can seem like a jungle, filled with danger for their children. But jungles contain wonders as well as dangers and with good guides, some education, and a few precautions(预防措施), the wilds of the Internet can be safely navigated(航行). Kids have to be on-line. If we tell our kids they cant have access to the Internet, were cutting them off from their future, said an expert.Most kids have started to use search engines. Many of them are great for finding tons of interesting Internet sites, and they can also locate places where you might not want your kids to go. There are search engines designed just for kids. A certain software contains only sites that havebeen selected as safe. The most popular way to limit access would be to use what is known as a content screener(过滤器). But this can’t be wholly reliable, and the best thing parents can do is to talk to their kids and let them know what is OK or not OK to see or do on the Internet. Another way is that mum or dad is nearby when the child is surfing(浏览) the Internet.A few other tips●Don’t put the PC in a child’s room but keep it in an area where mum or dad can keep an eye on things. That also makes the Internet more of a family activity.●Ask your child what he or she has been doing and about any friends they make on-line.●Tell your child not to give on-line strangers personal information, especially like address and phone number.●And tell your children never to talk to anyone they meet on-line over the phone, send them anything, accept anything from them or agree to meet with them unless you go along.69. The best way to protect children from improper material is _______.A. to install(安装) a content screener on the computerB. to buy some search engines for the childrenC. to be nearby when they are surfing the InternetD. to talk to the children and persuade them to tell right from wrong70. Which of the following is right according to the passage?A. Surfing the Internet is the best method of educating children.B. Children’s not having access to Internet may have effect on their progress.C. Using a content screener is most reliable for keeping children having access to Internet.D. Searching engines can help children to select materials fit for them.71. According to the passage, we can infer that _______.A. soft wares fit for children want programmingB. a child who is on-line is in dangerC. Internet is a jungle full of dangerD. Internet contains a lot of harmful sites(C)LONDON—Life for Cathy Hagner and her three children is set to permanent(永久的) fast-forward.Their full school day and her job as a lawyer's assistant are busy enough. But Hagner also has to take the two boys to soccer or hockey or basketball while dropping off her daughter at piano lessons or Girl Scout Club.Often, the exhausted family doesn't get home until 7 pm. There is just time for a quick supper before homework. In today's world, middle-class American and British parents treat their children as if they are competitors racing for some finishing line.Parents take their children from activity to activity in order to make their future bright. It seems that raising a genius has become a more important goal than raising a happy and well-balanced child."Doctors across the country are reporting a growing number of children suffering from stomachaches and headaches due to exhaustion and stress," says child expert William Doherty of the University of Minnesota.Teachers are dealing with exhausted kids in the classroom. It's a very serious problem. Many children attend after-school clubs by necessity. But competitive pressures also create an explosion of activities. They include sports, language, music and math classes for children as young as four."There is a new parenting trend under way which says that you have to tap all your child's potential at a young age; otherwise you will let him down,” says Terry Alter, a Cambridge-based child and adolescent psychiatrist (青少年精神病专家)"It isn't entirely new: there have always been pushy parents. But what was previously seen as strange behaviour is now well accepted."72. From the second paragraph of this passage we can find that ______.A. Hagner wastes much time helping her children's lessonsB. Hagner doesn't spend much time on her full-time jobC. Hagner is interested in spots and musicD. Hagner busies herself by following a trend73. British parents, as the writer described in this passage, _____.A. treat their children as spots playersB. pay no attention to their children's lessonsC. bring up their children in a simple wayD. give their children little time to develop freely74. The writer's opinion about after-school clubs is that ______.A. activities in the country are too competitiveB. children should attend four clubs at a timeC. some clubs result in competitive pressuresD. clubs should have more subjects for school children75. The last paragraph tells us that in Britain ______.A. parents used to take their children to every clubB. parents used to be wise on how to raise childrenC. parents have all benefited from children's clubsD. parents have come to know the standard of education(D)Section C:Directions: Read the following text and choose the most suitable heading from A-F for each76. __________While everybody enjoys fresh cut flowers around his house, few people know how to keep them for as long as possible. This may be done by keeping in mind a few simple facts. The key to keeping fresh cut flowers for a week or more without floral preservatives(which contain biocides that kill bacteria and fungus) is to keep the water fresh and the stems free of air pockets so they can continue to draw up water.77. __________An important thing to remember about cut flowers is that they are sensitive to temperature. For example, studies have shown that cut carnations(康乃馨) retain their freshness eight times longer when kept at 12℃than when kept at 26℃. Keeping freshly harvested flowers at the right temperatures is probably the most important aspect of flower care.78. __________Flowers are not intended by nature to live very long. Their biological purpose is simply to attract birds or insects, such as bees, for pollination (授粉). After that, they quickly dry up and die.The process by which flowers consume oxygen and produce carbon dioxide, called respiration (呼吸), generates the energy the flower needs to give the flower its shape and colour. The making of seeds also depends on this energy. While all living things respire, flowers have a high level of respiration. A result of all this respiration is heat, and for flowers the level of heat relative to the mass of the flower is very high. Respiration also brings about the eventual death of the flower. Thus the greater the level of respiration, the sooner the flower dies.79. __________How, then, to control the rate at which flowers die? By controlling respiration. How is respiration controlled? By controlling temperature. We know that respiration produces heat, but the reverse is also true. Thus by maintaining low temperatures, respiration is reduced and the cut flower will age more slowly.80. __________Another vital factor in keeping cut flowers is the quality of the water in which they are placed. Flowers find it difficult to “drink” water that is dirty or otherwise polluted. Even when water looks and smells clean, it almost certainly contains harmful substances that can endanger the flowers. To rid the water of these unwanted substances, household chlorine bleach (含氯漂白剂) can be used in small quantities. It is recommended that 15 drops of chlorine bleach(at 4% solution) be added to each litre of water. The water and solution should also be replaced each day.(E)Section D(8分)Complete the following sentences using fewest words.What’s your dream vacation? Watching wildlife in Kenya? Boating down the Amazon? Sunbathing in Malaysia? New chances are opening up all the time to explore the world. So we visit travel agents, compare packages and prices, and pay our money.We know what our vacation costs us. But do we know what it might cost someone else? It’s true that many poorer countries now depend on tourism for foreign income. Unfortunately, though, tourism often harms the local people more than it helps them.It might cost their homes and lands. In Myanmar, 5,200 people were forced to leave their homes among the pagodas (佛塔)in Bagan so that tourists could visit the pagodas.Tourism might also cost the local people their livelihood and dignity. Local workers often find only menial (卑微的)jobs in the tourists industry. And most of the profits do not help the local economy. Instead, profits return to the tour operators in wealthier countries. When the Maasai people in Tanzania were driven from their lands, some moved to city slums. Others now make a little money selling souvenirs or posing for photos.Problems like these were observed more than 20 years ago. But now some non-government organizations, tour operators and local governments are working together to begin correcting them. Tourists, too, are putting on the pressure.The result is responsible tourism, or “ethical tourism. ”Ethical tourism has people at its heart. New international agreements and codes of conduct can help protect the people’s lands, homes, economies and cultures. The beginnings are small, though, and the problems are complex.But take heart. The good news is that everyone, including us, can play a part to help the local people in the places we visit. Tour operators and companies can help by making sure that local people work in good conditions and earn reasonable wages.They can make it a point to use only locally owned hotels, restaurants and guide services. They can share profits fairly to help the local economy. And they can involve the local people in planning and managing tourism.What can tourists do? First, we can ask tour companies to provide information about the conditions of local citizens. We can then make our choices and tell them why. And while we’re abroad, we can:★Buy local foods and products, not imported ones.★Pay a fair price for goods and services and not bargain for the cheapest price.★Avoid flaunting wealth.★Ask before taking photographs of people.They are not just part of the landscape!Let’s enjoy our vacation and make sure others do, too.81. What’s the main idea the writer intends to tell us in this passage?_____________________________________________________________.82. Why does the author say vacations cost someone else in this passage?_____________________________________________________________.83. It can be learned from the passage that profits go back to richer countries through ____________________.84. In which aspect can they involve the local people? ____________________.第II卷(共45分)I.TranslationDirections: Translate the flowing sentences into English. You are required to use the word given in the bracket for each respective sentence.1.警方劝告开车的人暂时不要使用这条公路。

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