2013中考单选汇集1-3

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2013常德中考卷

2013常德中考卷

2013常德中考卷一、选择题(每题1分,共5分)1. 下列哪种物质是植物进行光合作用的主要原料?()A. 水B. 二氧化碳C. 氧气D. 糖类2. 在我国,下列哪个城市被称为“日光城”?()A. 杭州B. 拉萨C. 成都D. 昆明3. 下列哪个朝代实行了科举制度?()A. 秦朝B. 汉朝C. 唐朝D. 宋朝A. 《诗经》B. 《楚辞》C. 《乐府诗集》D. 《全唐诗》5. 下列哪个是计算机的输出设备?()A. 键盘B. 鼠标C. 显示器D. 打印机二、判断题(每题1分,共5分)1. 水的化学式为H2O,其中氢元素和氧元素的质量比为1:8。

()2. 地球自转的方向是自西向东。

()3. “大禹治水”的故事讲述的是大禹成功治理了黄河的洪水。

()4. 《红楼梦》是我国四大名著之一,作者是曹雪芹。

()5. 在Excel中,函数“SUM”用于求平均值。

()三、填空题(每题1分,共5分)1. 我国古代著名的“四大发明”包括:____、____、____、____。

2. 在平面几何中,若两条直线平行,则它们的斜率____。

3. 《论语》是记录孔子及其弟子言行的著作,其中“仁者爱人”是孔子的____。

4. 世界上面积最大的国家是____,面积最小的国家是____。

5. 在计算机硬件中,____是负责存储程序和数据的设备。

四、简答题(每题2分,共10分)1. 请简述质量守恒定律的内容。

2. 请简要介绍我国传统节日“端午节”的习俗。

3. 请列举出三种常见的岩石类型。

4. 请简述达尔文自然选择学说的主要内容。

5. 请解释计算机病毒的危害。

五、应用题(每题2分,共10分)1. 小明家的花园长10米,宽6米,他想在花园四周种树,每隔2米种一棵,问他需要种多少棵树?2. 一辆汽车以60km/h的速度行驶,行驶了2小时后,求汽车行驶的距离。

3. 已知一个正方形的边长为5cm,求其面积。

4. 某商店进行打折促销,原价为200元的商品,打8折后,顾客实际支付多少元?5. 在一次数学竞赛中,共有10道题,每道题答对得10分,答错或不答不得分。

2013安徽中考数学试题及答案(Word版)

2013安徽中考数学试题及答案(Word版)

AB C DP R图(2)AB C D图(1)绝密★启用前2013年安徽省初中毕业学业考试数学试题注意事项:本卷共八大题,计23小题,满分150分,考试时间120分钟 一、选择题(本大题共10小题,每小题4分,满分40分)每小题都给出代号为A 、B 、C 、D 的四个选项,其中只有一个是正确的,请把正确选项的代号写在题后的括号内。

每一小题,选对得4分,不选、选错或选出的代号超过一个的(不论是否写在括号内)一律得0分。

1.下列计算中,正确的是( ) A .a3+a 2=a 5 B .a 3·a 2=a 5 C .(a 3)2=a 9D .a3-a 2=a2.9月20日《情系玉树 大爱无疆──抗洪抢险大型募捐活动》在中央电视台现场直播,截至当晚11时30分特别节目结束,共募集善款21.75亿元。

将21.75亿元用科学记数法表示(保留两位有效数字)为 ( ) A .21×108元 B .22×108元 C .2.2×109元 D .2.1×109元 3.图(1) 是四边形纸片ABCD ,其中∠B =120︒, ∠D =50︒。

若将其右下角向内折出一∆PCR ,恰使CP//AB ,RC//AD ,如图(2)所示,则∠C 为( ) A .80︒ B .85︒ C .95︒ D .110︒4. 在下面的四个几何体中,它们各自的左视图与主视图不全等的是( )5. 如果有意义,那么字母x 的取值范围是( )A .x ≥1B .x >1C .x ≤1D .x <1 6. 下列调查方式合适的是( )A .了解炮弹的杀伤力,采用普查的方式B .了解全国中学生的视力状况,采用普查的方式A .B .C .D .C .了解一批罐头产品的质量,采用抽样调查的方式D .对载人航天器“嫦娥二号”零部件的检查,采用抽样调查的方式 7. 已知半径分别为4cm 和7cm 的两圆相交,则它们的圆心距可能是( )A .1cmB .3cmC .10cmD .15cm 8.函数y=(1-k)/x 与y=2x 的图象没有交点,则k 的取值范围为( )A .k<0B .k<1C .k>0D .k>19.如图,在平面直角坐标系中,⊙M 与y 轴相切于原点O ,平行于x 轴的直线交⊙M 于P ,Q 两点,点P 在点Q 的右方,若点P 的坐标是(-1,2),则点Q 的坐标是( ) A .(-4,2) B .(-4.5,2) C .(-5,2) D .(-5.5,2)10.如图,有三条绳子穿过一片木板,姐妹两人分别站在木板的左、右两边,各选该边的一条绳子。

2013年浙江省温州市初中毕业生学业考试(中考)(含答案解析)

2013年浙江省温州市初中毕业生学业考试(中考)(含答案解析)

22013年浙江省初中毕业生学业考试(温州市卷)科学(相对原子质量:H—1O—16Na—23Cl—35.5)卷Ⅰ一、选择题(本题有20小题,第1—10题每小题3分,第11—20题每小题4分,共70分。

每小题只有一个选项是正确的,不选、多选、错选均不给分)1.歼-15是我国第一代航母舰载机。

下列能正确表示其在空中飞行时所受的重力的方向是()2.最近,《自然》杂志刊登了一项电解氧化铁的“绿色炼铁”技术。

电解之前需要加热固态氧化铁,使其变为液态,这一物态变化是()A.汽化B.凝固C.熔化D.液化3.最近,科研人员在我省磐安发现一种新的被子植物——“磐安樱”。

磐安樱生命活动的基本结构和功能单位是()A.系统B.器官C.组织D.细胞4.将铁、铜分别放入稀硫酸中,铁表面有气泡产生,而铜表面无明显现象。

通过这一现象可以判断()A.铁的导电性比铜强B.铁的金属活动性比铜强C.铁的导电性比铜弱D.铁的金属活动性比铜弱5.根据物质的组成,小明将部分物质分为甲、乙两类(如表所示)。

下列对分类结果判断正确的是()A.甲为化合物,乙为单质C.甲为氧化物,乙为金属D.甲为金属,乙为氧化物6.近日,某省发现部分大米镉超标,镉超标易引起镉中毒。

镉元素的核电荷数为48,相对原子质量为112,则镉原子的核外电子数是()A.48B.64 C.112D.1607.下图是某生态系统中的食物网示意图。

其中表示生产者的是()A.甲B.乙C.丙D.丁8.木工师傅做家具时,来回拉动锯条锯木头,锯条温度将升高。

该过程主要通过() A.热传递使锯条的内能增加B.做功使锯条的内能增加C.热传递使锯条的内能减少D.做功使锯条的内能减少9.为了预防樱桃在成熟期发生果实开裂,果农常施钾肥。

下列属于钾肥的是() A.NH4NO3B.CO(NH2)2C.Ca(H2PO4)2D.K2CO310.如图是地球的内部结构圈层示意图,由外到内....依次表示()A.地幔、地核、地壳B.地壳、地幔、地核C.地核、地壳、地幔D.地核、地幔、地壳11.构建知识网络是一种重要的学习方法。

2013中考单选全攻略(四)

2013中考单选全攻略(四)

中考单选全攻略(四)331. I __ , because I don’t want to be late for school.A. am used to getting up earlyB. used to getting up earlyC. was used to getting up earlyD. used to get up early332 . He said he __ visit China if he __time the next day.A. will; hadB. will; will haveC. would; hadD. would; would have 333 . Here are two pens. You may use__ of them.A. anyB. eitherC. allD. each334 . So far, they__ two thousand English vocabularies.A. learnedB. have learnedC. learnD. are learning335 . __ of the land in the world is covered__ water.A. two third: byB. two thirds; withC. two three; byD. two third; with336 . The long work made us__ quite thirsty.A. feelB. to feelC. feelingD. felt337 . He made us __ there.A. not to goB. not goC. not goingD. no go338 . __, the glass is full of hot water.A. careB. carefulC. be carefulD. take care of339 . The __ Great Wall __ all over the world.A. well-known; is known wellB. famous; knows wellC. well-known; was known wellD. famous; is known good340 . The Great Wall ___.A. is famous as its lengthB. is famous for its lengthC. is famous with its lengthD. is famous for its long341 . There’s __ in today’s evening paper.A. nothing new elseB. new nothing elseC. nothing else newD. else nothing new342 . The aunt killed the ant last month. This was the ant’s__. So the ant __ for a monthA. death; has been deadB. dead; diedC. death; diedD. die; has been dead343 . By the end of the year, __ persons had planted about five__ trees.A. hundreds of; hundreds ofB. hundreds; hundredC. hundreds; hundreds ofD. hundreds of; hundred344 . There will be a talk __ English teaching this afternoon.A. forB. onC. inD. with345 . --___the kitchen?--yes, I___ it a few minutes ago.A. will you clean; have cleanedB. have you cleaned; cleanedC. Did you clean; have cleanedD. Do you clean; cleaned346 . What __ you better do __ a shop assistant?A. do; byB. have; asC. had; byD. had; as347 . Either of his feet __ in the accident.A. gets hurtB. get hurtC. hurtsD. hurt348 . We’ve seen this film,__?A. haven’t ourB. haven’t usC. have weD. haven’t we 349 . We have never seen this film,__?A. haven’t ourB. haven’t usC. have weD. haven’t we350 . Do you know__ they are going with?A. whichB. whatC. whoseD. who351 . –Must I sing the song in English? -- no, you___.A. needn’tB. don’t have toC. mustn’tD. don’t need to 352. My mother is busy__ now.A. cooksB. cookedC. cookingD. to cook353 . Could you tell me__?A. where does to Tom liveB. where Tom livesC. where is Tom livingD. where Tom lived354 . Do you want to have__ to eat?A. something differentB. different somethingC. different anythingD. everything different355 . She will call you at once when she __ home.A. is gettingB. getsC. arrives inD. arrives at356 . –where is Li Lei?--he isn’t here. He __ to the post office.A. goesB. has beenC. wentD. has gone357 . When the teacher came in, the students stopped__ on the blackboard at once and ___ .A. draw; returning their seatsB. to draw; to return their seatsC. drawing; returning their seatsD. drawing; to return their seats358 . He __ sad because he has lost his bikeA. seesB. looksC. watchesD. reads359 . –___ is it from here?-- It is about 9 kilo.A. How oftenB. How muchC. How longD. How far360 . –___ is the road?-- It is about 9 kilo.A. How oftenB. How muchC. How longD. How far361 . The shoes were so expensive that it __ me 240 yuan.A. tookB. spentC. costsD. cost362 . He __ for her outside the building.A. decided to waitB. decision to waitC. made his decision to waitD. made decision to wait363 .___ can I keep the book?A. How longB. How farC. How soonD. How often364 . –would you like to come to our dinner party? --___.A. yes, I wouldB. yes, with pleasureC. no, I can’t comeD. sure, it’s my pleasure365 . These eggs were found by a group of scientists__.A. in the 1920B. in the 1920sC. in 1920D. in 1920s366 . How pleased the detective was__ what his customer told him!A. hearingB. heardC. to hearingD. to hear 367 . __ he is!A. what a pleasant detectiveB. what pleasant a detectiveC. how pleasant a detectiveD. how a pleasant detective368 . –I’d rather have some tea, if you don’t mind.--___.A. thank you very muchB. yes, I like soC. of course not, anything you wantD. no, it is nothing369 . –would you join our football team?--How many are there __ your team?A. inB. atC. onD. of370 . __ terrible life people in the small island lived at that time!A. whatB. howC. what aD. how a371 . They would rather spend time__ than__ in the street.A. read; wanderB. reading; wanderingC. in reading; to wonderD. reading; wander372 . We will do what we can __ English well this termA. studyB. to studyC. be studiedD. be studying 373 . –you seem to like sweets.--__. That’s probably why I’m becoming fatter and fatter.A. so I doB. so do IC. so am ID. so I am374 . With the help of the computer, information can__ every corner of the world.A. reachB. returnC. recoverD. get to375 . The children__ not to play with the fire.A. are often toldB. was often toldC. will often be toldD. did often told376 . –My trousers are ___.--I will buy you a new pair.A. put outB. wore outC. work outD. sold out 377 . –he seems __ ill. Shall we take him to the hospital right now?--I don’t think it matters. Maybe he’s caught a bit of a cold.A. terribleB. terriblyC. to get terriblyD. to be terrible378 . –Would you like __ some fruit?--No, thanks. I don’t feel like __ anything now.A. to have; to eatB. having; to eatC. having; eatingD. to have; eating379 . Please keep the ice-box __. The meat will __.A. turning on; keepB. open; freshC. turning on; keep onD. open; be fresh380 .--- I am too busy __ to my family often.--- why not call them instead?A. to writeB. writingC. writtenD. write381 . What __ Tom?A. happenedB. happened toC. took place toD. took place 382 . He ___ his homework just now.A. didB. doesC. is doingD. will do383 . A terrible thing happened to him___.A. thenB. just thenC. right nowD. just384 . –what did you__ just now?-- I __ you if you could follow me.A. say; saidB. speak; askedC. speak; saidD. say; asked385 . I really hope you to __ me what you said.A. tellB. speakC. sayD. talk386 . I am afraid there is __ rice at home. We’d go and buy some.A. littleB. a littleC. fewD. a few387 . Nice __ to you. And thank you for your dinner. bye bye.A. to talkB. talkC. talkingD. talked388 . –How do you like this book? --___.A. very muchB. very wellC. very betterD. very fine 389 . I eat __ vegetables and __ meat than I __ last year.A. less; fewer; didB. fewer; less; doC. less; less; doD. fewer; less; did390 . –I tried to make Kate__ her mind, but I found it was hard.-- Well, I saw you __ that when I went past.A. change; doB. changes; doingC. to change; doD. change; doing 391 . Three __ are waiting for you.A. personB. peopleC. Human beingD. persons392 . –What___ the population of the town?--Over 20,000. And a third of the population __ workers of the factory.A. is; areB. is; isC. are; isD. are; are393 . –does the child need any help?--No. he is old enough to __ himself.A. put onB. wearC. dressD. take care394 . ---sorry, I am late.---it doesn’t matte. The meeting__ for just several minutes.A. has begunB. has startedC. has been onD. had been on395 . –The robber didn’t tell the truth, did he?--___. The police will have much trouble __ the necklace.A. no, he didn’t; to findB. yes, he did; findingC. no, he didn’t; findingD. yes, he did; to find396. It is so foggy today. You should ride your bike__.A. as careful as possibleB. as carefully as possibleC. as careless as possibleD. as carefully as you can397 . A number of workers in this factory__ Party members, and the number __ 45.A. is; isB. are; areC. are; isD. is; are398 . – I wonder if you are interested in this movie?--it’s so___ that I am very___.A. interesting; excitingB. interesting; excitedC. interested; excitedD. interested; exciting399 . –Are you sure that he __ tonight?-- Of course. Don’t worry. I will let you know as soon as he__.A. will come; comesB. comes; will comeC. will come; will comeD. comes; comes400 . –Go and ask the waiter how much ___.--Don’t worry. It has been ___.A. does the meal cost; paid forB. the meal costs; paidC. the meal spends; paidD. the meal costs; paid for401 . There is __ “h” in the word “hour”.A. theB. aC. anD. /402 . –I’m sorry to have kept you waiting long.--Never mind. I __ here for only a few minutes.A. have beenB. have comeC. have arrivedD. waited 403 . –Could you tell me __? I must find him.--Sorry. I have no idea. But he was here just now.A. where Tom wasB. where has Tom goneC. where can I find TomD. where Tom is404 . Simon heard his neighbor ___ for help at nightA. callsB. callC. callingD. to call405 . –May I speak to John?--Sorry, he __ Canada. And he __ in 3 days.A. has been to; will come backB. has gone to; will be backC. has gone to; is going backD. has gone to; is going to come back406 . –will you please let me have a look at the photos taken in the States?--Sure. I will __ them here to school tomorrow.A. takeB. carryC. getD. bring407 . It is very nice__ you to say so.A. forB. ofC. withD. and408 . How about __ to the cinema on Sunday?A. goB. to goC. goingD. will go409 . –Will you please __ me how to operate the new machine?--Sure. Now let me tell you__ to do first.A. showed; whatB. show; howC. to show; whetherD. showing which410 . –were you late for the meeting?--No, I __ there ten minutes __ the meeting started.A. arrived at; afterB. arrived in; afterC. arrived; beforeD. got; before411 . How many English words had you learned __ last year?A. at the end ofB. at the endC. in the endD. finally412 . There are many shops on __ side of the street and trees on __ sides of the street.A. either; bothB. each; allC. between; amongD. one; the other 413 . –Why are you busy these days? --__ I am writing a book.A. sinceB. asC. forD. because414 . I am busy these days __ I’m writing a book.A. sinceB. asC. forD. because415 . My mother does some__ on Sunday.A. washingB. washC. to washD. washed416 . –The rain __ last night. The fields are still full of water.--It __ for nearly a week.A. stopped ; had rainedB. stopped; has rainedC. stops; had rainedD. stops; has rained417 . –The rain __ now. The fields are full of water.--It __ for nearly a week.A. stopped ; had rainedB. stopped; has rainedC. stops; had rainedD. stops; has rained418 . –Do you like __ a teacher?--Sure. But my parents __ me to be a doctor.A. are; wishedB. to be; wishC. are; hopedD. to be; hope419 . –Something must be done to stop the farmers cutting down the forests.--I agree __ you. If we__, a lot more good land will be gone with them.A. with; don’tB. on; don’tC. to; will notD. like; will not420 . –Did you __ the first place of the league match?--Of course we did. We__ all the other teams.A. beat; beatB. beat; wonC. win; wonD. win; beat 421 . –What he enjoys__ great and interesting.--Yes, __ it’s dangerous.A. sounding; butB. sounding; soC. to sound; soD. sounds; but422 . –Why not borrow some money from your friend?--But I know __ of the people here except you.A. nobodyB. noneC. no oneD. no423 . Let us help you carry water, ___?A. shall weB. don’t weC. don’t youD. wil l you424 . –Could you help me with my computer science? --___.A. it is my pleasureB. my pleasureC. with my pleasureD. with pleasure425 . He is good at playing __ soccer instead of __ piano.A. the; theB. /; theC. /;/D. the;/。

2013年中考英语试卷及答案

2013年中考英语试卷及答案

2013年上海市初中毕业统一学业考试英语试卷Part 2 Vocabulary and GrammarV. Choose the best answer31. Perhaps the famous football star won’t play ____________ football any longer.A) a B)an C) the D)/32. My parents showed ___________ some old pictures that brought back sweet memories.A) I B) me C) my D) mine33.Wow! Ten students in our class will celebrate their fourteen birthdays ___________ October!A) in B)on C) at D) to34. The chemicals in the vegetables and fruit are bad ___________ our health.A) from B) with C) of D) for35. A lot of foreigners __________ familiar with the famous places of interest in China.A) am B) is C)are D) be36. The student didn’t find much __________ about the topic on that website.A) report B) article C)information D) story37. __________ is waiting for you at the gate. He wants to say thanks to you.A) Somebody B) Anybody C) Everybody D)Nobody38. ---___________ have you been in the sports club?---Since the first month I came to the school.A) How old B) How long C)How much D) How soon39.My old neighbor Charles felt __________ after his children moved out.A) lonely B) safely C) angrily D) happily40. ---Must I go to medical school and be a doctor like you, Dad?---No, you __________, son. You’re free to make you own decision.A) can’t B)mustn’t C) shouldn’t D) needn’t41. The volunteer spoke as__________ as she could to make the visitors understand her.A)clearly B)more clearly C) most clearly D) the most clearly42. Which do you prefer to use to keep in touch with your friends, QQ________ MSN?A)and B)but C) or D) so43. I hate travelling by air ___________ you usually have to wait for hours before the plane takes off.A) because B)though C) until D) unless44. Look, so many passengers __________ with their smart phones on the underground.A) played B)will play C) are playing D) have played45. The schoolboy _________ to the blind man on his way home yesterday afternoon..A)apologizes B)apologized C) will apologize D) have apologized46. The official said they _________ a new law to protect the tourists the next year.A) makes B) would make C) made D) have made47. –Even Tony’s granddaughter, a five-year-old girl, asked him _________smoking.A)give up B) gave up C) to give up D) giving up48. The retired couple enjoy __________ photos. They always go out with their cameras.A) take B) took C) to take D) taking49. ---Tim and I will visit the exhibition this weekend. Would you like to join us?---_____________.A) Well done. B)That’s all right. C) You’re welcome. D) I’d love to.50. ---We’ll study in different schools next term. Enjoy your time in the new school!---_____________.A) I’ll take your advice. B) The same to you.C) Congratulations! D) Me too.III. Complete the following passage with the words or phrases in the box. Each word or phrase can only be used once. (将下列单词或词组填入空格。

2013年上海市中考数学试卷及答案

2013年上海市中考数学试卷及答案

2013年上海市中考数学试卷一、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.】.(4分)(2013•上海)下列式子中,属于最简二次根式的是()B .C.D.25.(4分)(2013•上海)如图,已知在△ABC中,点D、E、F分别是边AB、AC、BC上的点,DE∥BC,EF∥AB,且AD:DB=3:5,那么CF:CB等于()A5:8 B3:8 C3:5 D2:56.(4分)(2013•上海)在梯形ABCD中,AD∥BC,对角线AC和BD交于点O,下列条件中,能判断梯形二、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.(4分)(2013•上海)分解因式:a2﹣1=_________.8.(4分)(2013•上海)不等式组的解集是_________.9.(4分)(2013•上海)计算:=_________.11.(4分)(2013•上海)已知函数,那么=_________.12.(4分)(2013•上海)将“定理”的英文单词theorem中的7个字母分别写在7张相同的卡片上,字面朝下随意放在桌子上,任取一张,那么取到字母e的概率为_________.13.(4分)(2013•上海)某校报名参加甲、乙、丙、丁四个兴趣小组的学生人数如图所示,那么报名参加甲组和丙组的人数之和占所有报名人数的百分比为_________.14.(4分)(2013•上海)在⊙O中,已知半径长为3,弦AB长为4,那么圆心O到AB的距离为_________.15.(4分)(2013•上海)如图,在△ABC和△DEF中,点B、F、C、E在同一直线上,BF=CE,AC∥DF,请添加一个条件,使△ABC≌△DEF,这个添加的条件可以是_________.(只需写一个,不添加辅助线)16.(4分)(2013•上海)李老师开车从甲地到相距240千米的乙地,如果油箱剩余油量y(升)与行驶里程x(千米)之间是一次函数关系,其图象如图所示,那么到达乙地时油箱剩余油量是_________升.17.(4分)(2013•上海)当三角形中一个内角α是另一个内角β的两倍时,我们称此三角形为“特征三角形”,其中α称为“特征角”.如果一个“特征三角形”的“特征角”为100°,那么这个“特征三角形”的最小内角的度数为_________.18.(4分)(2013•上海)如图,在△ABC中,AB=AC,BC=8,tanC=,如果将△ABC沿直线l翻折后,点B落在边AC的中点处,直线l与边BC交于点D,那么BD的长为_________.三、解答题:(本大题共7题,满分78分)(本大题共7题,19~22题10分,23、24题12分,25题14分,满分78分)[将下列各题的解答过程,做在答题纸的相应位置上]19.(10分)(2013•上海)计算:.20.(10分)(2013•上海)解方程组:.21.(10分)(2013•上海)已知平面直角坐标系xOy(如图),直线经过第一、二、三象限,与y轴交于点B,点A(2,t)在这条直线上,联结AO,△AOB的面积等于1.(1)求b的值;(2)如果反比例函数(k是常量,k≠0)的图象经过点A,求这个反比例函数的解析式.22.(10分)(2013•上海)某地下车库出口处“两段式栏杆”如图1所示,点A是栏杆转动的支点,点E是栏杆两段的连接点.当车辆经过时,栏杆AEF升起后的位置如图2所示,其示意图如图3所示,其中AB⊥BC,EF∥BC,∠EAB=143°,AB=AE=1.2米,求当车辆经过时,栏杆EF段距离地面的高度(即直线EF上任意一点到直线BC的距离).(结果精确到0.1米,栏杆宽度忽略不计参考数据:sin 37°≈0.60,cos 37°≈0.80,tan 37°≈0.75.)23.(12分)(2013•上海)如图,在△ABC中,∠ACB=90°,∠B>∠A,点D为边AB的中点,DE∥BC交AC 于点E,CF∥AB交DE的延长线于点F.(1)求证:DE=EF;(2)连结CD,过点D作DC的垂线交CF的延长线于点G,求证:∠B=∠A+∠DGC.24.(12分)(2013•上海)如图,在平面直角坐标系xOy中,顶点为M的抛物线y=ax2+bx(a>0),经过点A和x 轴正半轴上的点B,AO=OB=2,∠AOB=120°.(1)求这条抛物线的表达式;(2)连接OM,求∠AOM的大小;(3)如果点C在x轴上,且△ABC与△AOM相似,求点C的坐标.25.(14分)(2013•上海)在矩形ABCD中,点P是边AD上的动点,连接BP,线段BP的垂直平分线交边BC于点Q,垂足为点M,联结QP(如图).已知AD=13,AB=5,设AP=x,BQ=y.(1)求y关于x的函数解析式,并写出x的取值范围;(2)当以AP长为半径的⊙P和以QC长为半径的⊙Q外切时,求x的值;(3)点E在边CD上,过点E作直线QP的垂线,垂足为F,如果EF=EC=4,求x的值.2013年上海市中考数学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)【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.】.(4分)(2013•上海)下列式子中,属于最简二次根式的是()B .C.D.式分解后再观察.解:A、=3,故此选项错误;B、是最简二次根式,故此选项正确;C、=2,不是最简二次根式,故此选项错误;D、=,不是最简二次根式,故此选项错误;故选:B.本题考查了最简二次根式的定义.在判断最简二次根式的过程中要注意:2根据中位数和平均数的定义求解即可.解:这组数据的中位数为:(1+3)÷2=2,平均数为:=2.故选B.本题考查了中位数及平均数的定义,属于基础题,掌握基本定义是关键.5.(4分)(2013•上海)如图,已知在△ABC中,点D、E、F分别是边AB、AC、BC上的点,DE∥BC,EF∥AB,且AD:DB=3:5,那么CF:CB等于()A5:8 B3:8 C3:5 D2:56.(4分)(2013•上海)在梯形ABCD中,AD∥BC,对角线AC和BD交于点O,下列条件中,能判断梯形解:A、∵∠BDC=∠BCD,∴BD=BC,根据已知AD∥BC不能推出四边形ABCD是等腰梯形,故本选项错误;B、根据∠ABC=∠DAB和AD∥BC不能推出四边形ABCD是等腰梯形,故本选项错误;C、∵∠ADB=∠DAC,AD∥BC,∴∠ADB=∠DAC=∠DBC=∠ACB,∴OA=OD,OB=OC,∴AC=BD,∵AD∥BC,∴四边形ABCD是等腰梯形,故本选项正确;D、根据∠AOB=∠BOC,只能推出AC⊥BD,再根据AD∥BC不能推出四边形ABCD是等腰梯形,故本选项错误.故选C.本题考查了对等腰梯形的判定定理的应用,主要考查学生的推理能力和辨析能力,注意:等腰梯形的判定二、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.(4分)(2013•上海)分解因式:a2﹣1=(a+1)(a﹣1).8.(4分)(2013•上海)不等式组的解集是x>1.分别求出各不等式的解集,再求出其公共解集即可.解:,由①得,x>1;由②得,x>﹣3,故此不等式组的解集为:x>1.故答案为:x>1.本题考查的是解一元一次不等式组,熟知“同大取大;同小取小;大小小大中间找;大大小小找不到”的原9.(4分)(2013•上海)计算:=3b.解:原式==3b,故答案为3b.本题考查了分式的乘除法,分式的乘除混合运算一般是统一为乘法运算,如果有乘方,还应根据分式乘方10.(4分)(2013•上海)计算:2(﹣)+3=.先去括号,然后进行向量的加减即可.解:2(﹣)+3=2﹣2+3=2+.故答案为:2+.本题考查了平面向量的知识,属于基础题,掌握向量的加减运算是关键.11.(4分)(2013•上海)已知函数,那么=1.把自变量的值代入函数关系式进行计算即可得解.解:f()==1.故答案为:1.本题考查了函数值求解,把自变量的值代入进行计算即可,比较简单.12.(4分)(2013•上海)将“定理”的英文单词theorem中的7个字母分别写在7张相同的卡片上,字面朝下随意放在桌子上,任取一张,那么取到字母e的概率为.让英文单词theorem中字母e的个数除以字母的总个数即为所求的概率.解:∵英文单词theorem中,一共有7个字母,其中字母e有2个,∴任取一张,那么取到字母e的概率为.故答案为.本题考查了概率公式,用到的知识点为:概率等于所求情况数与总情况数之比.13.(4分)(2013•上海)某校报名参加甲、乙、丙、丁四个兴趣小组的学生人数如图所示,那么报名参加甲组和丙组的人数之和占所有报名人数的百分比为40%.各个项目的人数的和就是总人数,然后利用报名参加甲组和丙组的人数之和除以总人数即可求解.解:总人数是:50+80+30+40=200(人),则报名参加甲组和丙组的人数之和占所有报名人数的百分比为×100%=40%.故答案是:40%.本题考查了条形统计图,正确读图,理解图形中说明的意义是关键.14.(4分)(2013•上海)在⊙O中,已知半径长为3,弦AB长为4,那么圆心O到AB的距离为.定理及可求出OD的长.解:如图所示:过点O作OD⊥AB于点D,∵AB=4,∴BD=AB=×4=2,在Rt△OBD中,∵OB=3cm,BD=2cm,∴OD===.故答案为:.本题考查的是垂径定理及勾股定理,根据题意画出图形,利用数形结合求解是解答此题的关键.15.(4分)(2013•上海)如图,在△ABC和△DEF中,点B、F、C、E在同一直线上,BF=CE,AC∥DF,请添加一个条件,使△ABC≌△DEF,这个添加的条件可以是AC=DF.(只需写一个,不添加辅助线)∴△ABC≌△DEF(SAS),故答案为:AC=DF.本题考查了全等三角形的判定的应用,注意:全等三角形的判定定理有SAS,ASA,AAS,SSS,答案不16.(4分)(2013•上海)李老师开车从甲地到相距240千米的乙地,如果油箱剩余油量y(升)与行驶里程x(千米)之间是一次函数关系,其图象如图所示,那么到达乙地时油箱剩余油量是2升.出剩余的油量.解:设y与x之间的函数关系式为y=kx+b,由函数图象,得,解得:,则y=﹣x+3.5.当x=240时,y=﹣×240+3.5=2升.故答案为:2本题考查了运用待定系数法求一次函数的运用,根据自变量求函数值的运用,解答时理解函数图象的含义17.(4分)(2013•上海)当三角形中一个内角α是另一个内角β的两倍时,我们称此三角形为“特征三角形”,其中α称为“特征角”.如果一个“特征三角形”的“特征角”为100°,那么这个“特征三角形”的最小内角的度数为30°.18.(4分)(2013•上海)如图,在△ABC中,AB=AC,BC=8,tanC=,如果将△ABC沿直线l翻折后,点B落在边AC的中点处,直线l与边BC交于点D,那么BD的长为.首先根据已知得出△ABC的高以及B′E的长,利用勾股定理求出BD即可.解:过点A作AQ⊥BC于点Q,∵AB=AC,BC=8,tanC=,∴=,QC=BQ=4,∴AQ=6,∵将△ABC沿直线l翻折后,点B落在边AC的中点处,过B′点作B′E⊥BC于点E,∴B′E=AQ=3,∴=,∴EC=2,设BD=x,则B′D=x,∴DE=8﹣x﹣2=6﹣x,∴x2=(6﹣x)2+32,解得:x=,直线l与边BC交于点D,那么BD的长为:.故答案为:.此题主要考查了翻折变换的性质以及勾股定理和锐角三角函数关系,根据已知表示出DE的长是解题关三、解答题:(本大题共7题,满分78分)(本大题共7题,19~22题10分,23、24题12分,25题14分,满分78分)[将下列各题的解答过程,做在答题纸的相应位置上]19.(10分)(2013•上海)计算:.可.解:原式=2+﹣1﹣1+2=3.本题考查了实数的运算,涉及了二次根式的化简、绝对值、零指数幂、负整数指数幂等知识,属于基础20.(10分)(2013•上海)解方程组:.高次方程.先由②得x+y=0或x﹣2y=0,再把原方程组可变形为:或,然后解这两个方程组即可.解:,由②得:(x+y)(x﹣2y)=0,x+y=0或x﹣2y=0,原方程组可变形为:或,解得:,.此题考查了高次方程,关键是通过把原方程分解,由高次方程转化成两个二元一次方程,用到的知识点是21.(10分)(2013•上海)已知平面直角坐标系xOy(如图),直线经过第一、二、三象限,与y轴交于点B,点A(2,t)在这条直线上,联结AO,△AOB的面积等于1.(1)求b的值;(2)如果反比例函数(k是常量,k≠0)的图象经过点A,求这个反比例函数的解析式.可确定出反比例解析式.解:(1)过A作AC⊥y轴,连接OA,∵A(2,t),∴AC=2,对于直线y=x+b,令x=0,得到y=b,即OB=b,∵S△AOB=OB•AC=OB=1,∴b=1;(2)由b=1,得到直线解析式为y=x+1,将A(2,t)代入直线解析式得:t=1+1=2,即A(2,2),把A(2,2)代入反比例解析式得:k=4,则反比例解析式为y=.此题考查了一次函数与反比例函数的交点问题,涉及的知识有:一次函数与坐标轴的交点,坐标与图形性22.(10分)(2013•上海)某地下车库出口处“两段式栏杆”如图1所示,点A是栏杆转动的支点,点E是栏杆两段的连接点.当车辆经过时,栏杆AEF升起后的位置如图2所示,其示意图如图3所示,其中AB⊥BC,EF∥BC,∠EAB=143°,AB=AE=1.2米,求当车辆经过时,栏杆EF段距离地面的高度(即直线EF上任意一点到直线BC的距离).(结果精确到0.1米,栏杆宽度忽略不计参考数据:sin 37°≈0.60,cos 37°≈0.80,tan 37°≈0.75.)∴栏杆EF段距离地面的高度为:AB+EH≈1.2+0.96=2.16≈2.2(米).故栏杆EF段距离地面的高度为2.2米.本题考查了解直角三角形在实际中的应用,难度适中.关键是通过作辅助线,构造直角三角形,把实际问23.(12分)(2013•上海)如图,在△ABC中,∠ACB=90°,∠B>∠A,点D为边AB的中点,DE∥BC交AC 于点E,CF∥AB交DE的延长线于点F.(1)求证:DE=EF;(2)连结CD,过点D作DC的垂线交CF的延长线于点G,求证:∠B=∠A+∠DGC.菱形的判定与性质;全等三角形的判定与性质;直角三角形斜边上的中线.(1)首先证明四边形DBCF为平行四边形,可得DF=BC,再证明DE=BC,进而得到EF=CB,即可证出DE=EF;(2)首先画出图形,首先根据平行线的性质可得∠ADG=∠G,再证明∠B=∠DCB,∠A=∠DCA,然后再推出∠1=∠DCB=∠B,再由∠A+∠ADG=∠1可得∠A+∠G=∠B.证明:(1)∵DE∥BC,CF∥AB,∴四边形DBCF为平行四边形,∴DF=BC,∵D为边AB的中点,DE∥BC,∴DE=BC,∴EF=DF﹣DE=BC﹣CB=CB,∴DE=EF;(2)∵四边形DBCF为平行四边形,∴DB∥CF,∴∠ADG=∠G,∵∠ACB=90°,D为边AB的中点,∴CD=DB=AD,∴∠B=∠DCB,∠A=∠DCA,∵DG⊥DC,∴∠DCA+∠1=90°,∵∠DCB+∠DCA=90°,∴∠1=∠DCB=∠B,∵∠A+∠ADG=∠1,∴∠A+∠G=∠B.此题主要考查了平行四边形的判定与性质,以及直角三角形的性质,关键是找出∠ADG=∠G,24.(12分)(2013•上海)如图,在平面直角坐标系xOy中,顶点为M的抛物线y=ax2+bx(a>0),经过点A和x 轴正半轴上的点B,AO=OB=2,∠AOB=120°.(1)求这条抛物线的表达式;(2)连接OM,求∠AOM的大小;(3)如果点C在x轴上,且△ABC与△AOM相似,求点C的坐标.可.解:(1)过点A作AE⊥y轴于点E,∵AO=OB=2,∠AOB=120°,∴∠AOE=30°,∴AE=1,EO=,∴A点坐标为:(﹣1,),B点坐标为:(2,0),将两点代入y=ax2+bx得:,解得:,∴抛物线的表达式为:y=x2﹣x;(2)过点M作MF⊥OB于点F,∵y=x2﹣x=(x2﹣2x)=(x2﹣2x+1﹣1)=(x﹣1)2﹣,∴M点坐标为:(1,﹣),∴tan∠FOM==,∴∠FOM=30°,∴∠AOM=30°+120°=150°;(3)∵AO=OB=2,∠AOB=120°,∴∠ABO=∠OAB=30°,∴AB=2EO=2,当△ABC1∽△AOM,∴=,∵MO==,∴=,解得:BC1=2,∴OC1=4,∴C1的坐标为:(4,0);当△C2AB∽△AOM,∴=,∴=,解得:BC2=6,∴OC2=8,∴C2的坐标为:(8,0).综上所述,△ABC与△AOM相似时,点C的坐标为:(4,0)或(8,0).此题主要考查了锐角三角函数的应用以及待定系数法求二次函数解析式和相似三角形的性质等知识,利用25.(14分)(2013•上海)在矩形ABCD中,点P是边AD上的动点,连接BP,线段BP的垂直平分线交边BC于点Q,垂足为点M,联结QP(如图).已知AD=13,AB=5,设AP=x,BQ=y.(1)求y关于x的函数解析式,并写出x的取值范围;(2)当以AP长为半径的⊙P和以QC长为半径的⊙Q外切时,求x的值;(3)点E在边CD上,过点E作直线QP的垂线,垂足为F,如果EF=EC=4,求x的值.(3)如答图2所示,关键是证明△CEQ∽△ABP,据此列方程求出x的值.解:(1)在Rt△ABP中,由勾股定理得:BP2=AP2+AB2=x2+25.∵MQ是线段BP的垂直平分线,∴BQ=PQ,BM=BP,∠BMQ=90°,∴∠MBQ+∠BQM=90°,∵∠ABP+∠MBQ=90°,∴∠ABP=∠BQM,又∵∠A=∠BMQ=90°,∴△ABP∽△MQB,∴,即,化简得:y=BP2=(x2+25).当点Q与C重合时,BQ=PQ=13,在Rt△PQD中,由勾股定理定理得:PQ2=QD2+PD2,即132=52+(13﹣x)2,解得x=1;又AP≤AD=13,∴x的取值范围为:1≤x≤13.∴y=(x2+25)(1≤x≤13).(2)当⊙P与⊙Q相外切时,如答图1所示:设切点为M,则PQ=PM+QM=AP+QC=AP+(BC﹣BQ)=x+(13﹣y)=13+x﹣y;∵PQ=BQ,∴13+x﹣y=y,即2y﹣x﹣13=0将y=(x2+25)代入上式得:(x2+25)﹣x﹣13=0,解此分式方程得:x=,经检验,x=是原方程的解且符合题意.∴x=.(3)按照题意画出图形,如答图2所示,连接QE.∵EF=EC,EF⊥PQ,EC⊥QC,∴∠1=∠2(角平分线性质).∵PQ=BQ,∴∠3=∠4,而∠1+∠2=∠3+∠4(三角形外角性质),∴∠1=∠3.又∵矩形ABCD,∴AD∥BC,∴∠3=∠5,∴∠1=∠5,又∵∠C=∠A=90°,∴△CEQ∽△ABP,∴,即,化简得:4x+5y=65,将y=(x2+25)代入上式得:4x+(x2+25)=65,解此分式方程得:x=,经检验,x=是原方程的解且符合题意,∴x=.本题是中考压轴题,难度较大.试题的难点在于:其一,所考查的知识点众多,包括相似三角形的判定与参与本试卷答题和审题的老师有:caicl;sd2011;gbl210;HJJ;sks;HLing;wdxwwzy;CJX;hdq123;未来;ZJX;星期八;lantin;zjx111;zhjh(排名不分先后)菁优网2013年12月10日。

2013年江西中考真题

江西省2013年中等学校招生考试化学可能用到的相对原子质量:H—1C—12N—14O—16Na—23Mg—24Cl—35.5 Ca—40Cu—64一、单项选择题(本大题包括10小题,每小题2分,共20分。

每小题有四个选项,其中只有一个选项符合题意)1.空气中体积分数最大的气体是()A.氧气B.氮气C.二氧化碳D.稀有气体2.我国科学家用一种核内有4个质子和6个中子的铍原子来测定“北京猿人”的年龄,这种铍原子的相对原子质量约为()A.2B.4C.6D.103.下列实验操作中,正确的是()A.倾倒液体B.测溶液pHC.过滤D.塞紧橡胶塞4.下列体育用品中,不含有机合成材料的是()A.铅球B.乒乓球C.排球D.运动鞋5.实施“农村义务教育学生营养改善计划”后,某校课间为每个学生提供一包饼干。

饼干主要为人体补充的营养素是()A.糖类B.蛋白质C.维生素D.油脂6.下列粒子结构示意图中,表示原子的是()7.做面包时常用到的一种既能减少面粉发酵产生的酸又能使面包松软的白色物质是()A.食盐B.小苏打C.蔗糖D.烧碱8.对下列词语的有关化学原理解释不合理的是()A.火上浇油——隔绝空气B.风助火威——为燃烧提供足够多的氧气C.釜底抽薪——燃烧需要可燃物D.钻木取火——使温度达到可燃物的着火点9.下图是某反应过程的微观示意图,“”与“”分别表示不同元素的原子。

图中X处的粒子示意图是()10.下列图像能正确反映对应变化关系的是()A.用木炭还原氧化铜B.t℃时向饱和石灰水中加入生石灰C.镁在氧气中燃烧D.等质量、等溶质质量分数的过氧化氢溶液完全分解二、选择填充题(本大题包括5小题,每小题3分,共15分。

先在A、B、C中选择一个正确选项填在相应的括号内,然后在D处再补充一个符合题意的答案。

每小题的选择2分,填充1分)11.下列属于物理变化的是()A.食物腐败B.大米酿酒C.蜡烛熔化D.12.下列物质中,属于氧化物的是()A.O2B.P2O5C.KClO3D.13.农业上常用的化肥有:CO(NH2)2、Ca3(PO4)2、K2SO4、KNO3、NH4H2PO4、NH3·H2O,其中属于复合肥料的是()A.NH4H2PO4B.Ca3(PO4)2C.CO(NH2)2D.14.帕拉米韦是一种新型的抗流感病毒药物,下列对其主要成分(化学式为C15H28N4O4)的描述,正确的是()A.属于无机物B.由碳、氢、氮、氧四种元素组成C.其中碳、氢元素的质量比为15∶28D.分子中碳、氢、氮、氧原子的个数比为15.下列实验方案正确的是()选项实验目的所用试剂或方法A 除去硫酸镁溶液中的硫酸加入过量的Ba(OH)2溶液,过滤B 分离氯化钠和硝酸钠的固体混合物加水溶解后,过滤,蒸发结晶C 鉴别氯化铵和氯化钙分别加入熟石灰,研磨,闻气味D 鉴别羊毛织物和涤纶织物三、填空与说明题(本大题包括5小题,共30分)16.(3分)江西龙虎山因特有的丹霞地貌被誉为“中国红石公园”,其红色砂砾岩由石灰岩、氢氧化铁、石膏等成分组成。

2013北京中考数学试题、答案解析版

2013年北京市高级中等学校招生考试数学试卷一、选择题(本题共32分,每小题4分)下面各题均有四个选项,其中只有一个是符合题意的。

1. 在《关于促进城市南部地区加快发展第二阶段行动计划(2013-2015)》中,北京市提出了总计约3 960亿元的投资计划。

将3 960用科学计数法表示应为 ( ) A 。

39。

6×102 B 。

3.96×103 C. 3。

96×104 D. 3.96×104 考点:科学记数法—表示较大的数分析: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>1时,n 是正数;当原数的绝对值<1时,n 是负数. 解答:将3960用科学记数法表示为3。

96×103.故选B .点评:此题考查科学记数法的表示方法.科学记数法的表示形式为a×10n 的形式,其中1≤|a|<10,n 为整数,表示时关键要正确确定a 的值以及n 的值.2.43-的倒数是 ( )A. 34B. 43C. 43-D. 34-考点:倒数分析:据倒数的定义:若两个数的乘积是1,我们就称这两个数互为倒数 解答:D点评:本题主要考查倒数的定义,要求熟练掌握.需要注意的是: 倒数的性质:负数的倒数还是负数,正数的倒数是正数,0没有倒数. 倒数的定义:若两个数的乘积是1,我们就称这两个数互为倒数3. 在一个不透明的口袋中装有5个完全相同的小球,把它们分别标号为1,2,3,4,5,从中随机摸出一个小球,其标号大于2的概率为( )A. 51 B 。

52 C 。

53 D. 54考点:概率公式分析:根据随机事件概率大小的求法,找准两点:①符合条件的情况数目,②全部情况的总数,二者的比值就是其发生的概率的大小. 解答:C点评:本题考查概率的求法与运用,一般方法:如果一个事件有n 种可能,而且这些事件的可能性相同,其中事件A 出现m 种结果,那么事件A 的概率n mA P)(,难度适中。

2013年中考英语单项选择之定语从句试题汇编

2013年中考英语单项选择之定语从句试题汇编petition.A.whoB.thatC.whichD.whose【答案】D【解析】考查定语从句的连接词。

因为先行词是thegirl,表示人,而且连接词后紧跟名词invention作定语使用,所以选择D答案【2013黑龙江齐齐哈尔】16.I’llremembertheoldbuildingsIvisitedinthevillage.A.whereB.whichC.who【答案】B【解析】考查定语从句中的连接词的用法。

这里定语从句要修饰theoldbuildings,是事物,且在从句中做visited的宾语,所以要用连接代词that或which,所以选择答案C。

【2013广东】45.Theyounglady______isinterviewingLinZhixuanabouttheprogramIamasin gerisfrom21stCenturyTalentNet.A.whoB.whomC.whichD.whose【答案】A【解析】考查定语从句的用法。

先行词theyounglady指人,故排除C,D,先行词作主语故用who连接。

所以选择答案。

【2013天津】39.Themovie______wesawlastnightwasfantastic.A.thatB.whatC.whoseD.Who【答案】A【解析】考查定语从句中的关系代词。

句意:我们昨晚看的电影非常的好。

因先行词themovie指物,故用关系代词that引导定语从句。

【2013哈尔滨】30.—DoyouknowofGuoMingyi?—Yes.Heisanordinary(普通的)worker______helpsmanypoorchildreninChina.Weshouldfollowhisexam ple.A.thatB.whichC.whom【答案】A【解析】本题考查定语从句的关系词。

2013年徐州市中考数学试卷及答案


23.设原计划每天种树 x 棵,……1 分 则错误!……4 分 解得 x=40……6 分 经检验,x=40 是原方程的解,且符合题意……7 分 答:原计划每天种 40 棵树.……8 分 24.(1)法一:∵四边形 ABCD 是平行四边形, ∴AD=CB,∠A=∠C,∠ADC=∠CBA……1 分 ∵DE 平分∠ADC,BF 平分∠ABC ∴∠ADE=错误!∠ADC,∠CBF=错误!∠CBA, ∴∠ADE=∠CBF……4 分 ∴△ADE≌△CBF(ASA)……5 分 ∴DE=BF……6 分 法二:∵四边形 ABCD 是平行四边形, ∴DC∥AB,∴∠CDE=∠AED,……1 分 ∵DE 平分∠ADC
由折叠知,∠COF=∠DOF=90°,∴∠DCB+∠CFE=90°
∵∠B+∠A=90°,∴∠CFE=∠A……7 分
又∵∠C=∠C,∴△CEF∽△CBA……8 分
第8页(共10页)
27.(1)150……1 分
(2)a=(325-75 ×2.5)÷(125-75)=2.75 ,a+0.25=3……2 分
第4页(共10页)
27.(10 分)为增强公民的节约意识,合理利用天然气资源,某市自 1 月 1 日起对市区民用管道天然气价格
进行调整,实行阶梯式气价,调整后的收费价格如表所示:
每月用气量
单价(元/m3)
不超出 75m3 的部分
2.5
超出 75m3 不超出 125m3 的部分a
超出 125m3 的部分
第3页(共10页)
25.(8 分)如图,为了测量某风景区内一座塔 AB 的高度,小明分别在塔的对面一楼房 CD 的楼底 C,楼顶 D 处,测得塔顶 A 的仰角为 45°和 30°,已知楼高 CD 为 10m,求塔的高度(结果精确到 0.1m).(参考数据: ≈1.41,≈1.73)
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1 单项填空专练(1) 1. The lovely girl is from Class6. ____ name is Alice. A. Her B. His C. Your D. Its 2. — Is your father home? —No,he’s working late ____ the office. A. on B. at C. of D. to 3. There were only two paintings for sale and he bought ____. A. all B. any C. both D. some 4. Let’s ____ for a walk, shall we? A. to go B. going C. go D. gone 5. — Where were you last Saturday? —I ____ in the Capital Museum. A. am B. will be C. was D. have been 6. —Mum, must I wash the dishes right now? —No, you ____. A. shouldn’t B. wouldn’t C. mustn’t D. needn’t 7. I work hard this term, but Peter works much ____. A. hard B. harder C. hardest D. the hardest 8. —May I speak to the headmaster? —He ____ a meeting now. Can I take a message? A. is having B. had C. has D. will have 9. There are no buses, ____ you’ll have to walk. A. so B. or C. but D. for 10. — ____ is the dictionary? —It’s $22.95 A. How old B. How long C. How thick D. How much 11. I ____ Mr. Smith since he moved to Shanghai. A. didn’t hear from B. don’t hear from C. won’t hear from D. haven’t heard from 12. Today, computers are really helpful. They ____ everywhere. A. use B. are used C. used D. were used 13. — Can you tell me ____ the prize, Tom? —Last year. A. when you got B. when did you get C. when will you get D. when you will get 14. — What do you think of _______ film about Zhan Tianyou? —It’s __________ good film. A. the; the B. a; the C. the; a D. a; a 15. — Why didn’t Sally play the violin at the concert last night? —She said that her hand hurt, but that was only a(n) _______. I saw her play tennis just now. A. matter B. excuse C. result D. expression 2

16. All the students are talking and laughing in the classroom and it’s _________. A. noisy B. lonely C. quiet D. strict 17. — Would you please show me the way ________ the bank? —Yes, go straight ahead. It’s opposite a school. A. in B. for C. with D. to 18. We have never visited the museum, but we have ______ it. A. stood for B. belonged to C. heard about D. kept to 19. Who listens ________, Tom, Jack or Bill? A. the most carefully B. more carefully C. the most careful D. more careful 20. A snake bit him ___________ he went to see a doctor at once. A. if B. where C. because D. so 21. I have been to Shanghai. I __________ there last month. A. go B. went C. have gone D. will go 22. They were all very tired, but _______ of them took a rest. A. none B. all C. both D. either 23. The cloth __________very soft and comfortable. A. smells B. tastes C. feels D. sounds 24. — Why don’t you go out to play, Rose? —I’m afraid I can’t. I have much homework _________. A. do B. does C. doing D. to do 25. The 31th Olympic Games _________ in Brazil soon. A. held B. will be held C. were held D. have been held 26. — Can you tell me ________? — With Lucy’s help. A. when you did it so well B. when did you do it so well C. how you did it so well D. how did you do it so well 27. Please pass me the cartoon book _________ has a Mickey Mouse on the cover. A. whom B. whose C. who D. which 28. —I will have a match tomorrow. I hope I will win. —_____________. A. Good luck B. No idea C. That’s such a pity D. It’s all right 29. Lin is ____ good basketball player in the NBA. A. a B. an C. the D. / 30. My friend, Henry was born _____ June 10th, 1997. A. in B. on C. at D. for 31. --Bill, what's your sister's favorite_______. --She likes volleyball best. 3

A. food B. color C. sport D. movie 32. Mr. Li asks the students _________ in the river, because it's too dangerous. A. swim B. to swim C. not to swim D. to not swim 33. --______ did you visit the Science Museum? --Three months ago. A. When B. Where C. What D. Which 34. The flower smells _____ and I like it very much. A. well B. good C. bad D. badly 35. --Where is your cousin? --He _______ an English exam now. A. has B. had C. has had D. is having 36. There must be________ wrong with the clock. It doesn't work. A. nothing B. something C. everything D. anything 37. --Mom, must I clean my room now? --No, you _________ . You can do it tomorrow. A. can't B. needn't C. mustn't D. shouldn't 38. —Hello, may I speak to Sandy? —________. A. Yes, I'm Rose B. I'll call back again C. Yes, I can't hear you D. This is Sandy speaking 39.—Would you like _______red dress as a birthday present , Mary? —Sorry, mom. I prefer ______ orange one. A. a ; an B. a; a C. an; a D. a; a 40. —How was your trip in Chengdu? —Not so good. I stayed there for two days. But it rained on ______of the days. A. none B. neither C. both D. all 41. Jennifer takes a lot of exercise every day and she is always full of ______. A. knowledge B. energy C. change D. courage 42. — Can you answer the door, Jim? I ______ the dishes. —I’m coming, dad. A. do B. did C. have done D. am doing 43. Yao Ming is ______Chinese basketball player that ever played in NBA. A. tall B. taller C. tallest D. the tallest 44. The Internet is so closely connected with our daily life. Can you _____a life without it? A. understand B. imagine C. consider D. expect 45. —What smells terrible, Ted?

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