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八年级上册期末考试卷答案

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  八年级上册期末考试卷答案

  八年级语文上册期末试卷及答案

  一、 基础知识积累与运用(20分)

  1.读下面这段文字,根据拼音写出汉字。(4分)

  本想(zèng) 送你一座山、一片海,可我只有一滴水、一枝叶、一(lǚ) 阳光、一弯素月和在心中积聚了多年的一句殷殷的话语、一份浓浓的企盼——朋友,揣着一(kē) 自信的心上路,目标就不再(yáo) 远。

  2. 古诗文名句默写。(8分)

  ①明月松间照, 。 ② ,长使英雄泪满襟。

  ③人生自古谁无死, 。

  ④浩荡离愁白日斜, 。

  ⑤ ,总在有月亮的晚上想起。

  ⑥后来啊, 我在外头,母亲在里头。

  ⑦山舞银蛇, 。

  ⑧故垒西边,人道是, 。

  3.请根据你对“微笑”的理解,仿照下面画线的句子,再写两句,要求句式相同,语意连贯。(2分)

  朋友,你会微笑吗?微笑是一杯浓浓的咖啡, , ,微笑是一曲动人的音乐。微笑让我们的生活充满温馨。

  4、综合性学习与探究(共8分)

  材料一:龙,我国古代传说中的神异动物,能兴云降雨。(《辞海》)

  材料二:在上古的诗歌集《诗经》中,就已有关于龙的描述:“龙旗十乘”、“龙旗阳阳”,展示了在盛大的祭祀活动中,绘有龙纹的旗帜迎风猎猎的神圣庄严场面。在中国古代的小说中,龙也是个重要角色。较早的有《搜神记》、《续玄怪录》、《宣室志》等,最精彩的,是李朝威所著的《柳毅传书》。

  材料三:古代皇帝自称“真龙天子”,金碧辉煌的宫殿里描绘着龙,雕刻着龙,简直是“龙的世界”;人们生活中以龙为图案的服饰、器物、玩具随处可见,甚至谈话之间也离不开龙,如“龙凤呈祥”、“藏龙卧虎”,等等;以龙为名的民俗比比皆是,如龙舟、龙灯、龙笛等等;以龙为名的建筑、地名不胜枚举,如龙门、龙壁、龙亭等等。

  材料四:龙有着极高的地位,是中华民族的“图腾”,是中华民族的一种文化凝聚和积淀。龙成了中华民族、中国文化的象征。“龙的传人”这个称谓,将每一个炎黄子孙紧紧的联系在一起。

  (1)探究上述四则材料,用简洁的语言概述你对“龙”的认识。(至少三点)(3分)

  (2)请用一句话说说与龙有关的神话传说或人物故事。(2分)

  (3)最近有关媒体报道,有专家正在重新建构向世界展示中国国家形象的品牌,龙可能不再是中国形象标志,原因是“龙”在西方被认为是一种充满霸气和攻击性的庞然大物,“龙”的形象会让外国人对中国历史和文化产生片面、武断的联想。

  互联网上展开了“你认为是否有必要更换中国的形象标志——龙?”的调查和讨论。假如你是其中的一员,请谈谈你的看法,并阐述理由。(3分)

  二、阅读理解

  (一) 文言文阅读

  已而夕阳在山,人影散乱,太守归而宾客从也。树林阴翳,鸣声上下,游人去而禽鸟乐也。然而禽鸟知山林之乐,而不知人之乐;人知从太守游而乐,而不知太守之乐其乐也。醉能同其乐,醒能述以文者,太守也。太守谓谁?庐陵欧阳修也。

  1.选段出自课文《 》,作者 是 (朝代) 著名的 、 。

  2、解释下列句中画线的词语。

  (1)鸣声上下 (2)游人去而禽鸟乐也

  3、文中能表达“太守之乐”的是哪句话?

  4.文中哪句话将“醉”和“乐”统一起来,点明文章的主旨?

  5.这段话中写禽鸟之乐和游人之乐的用意是什么?

  6.“醉能同其乐”这句话在文中有什么作用?

  (二)阅读下面的文字,回答后面的问题。(14分)

  ①生物学家预言,21世纪将是细菌发电造福人类的时代。

  ②说起细菌发电,可以追溯到1910年。英国植物学家利用铂作为电极放入大肠杆菌的培养液中,成功地制造出了世界上第一个细菌电池1984年,美国科学家设计出太空飞船使用的细菌电池,其电极的活性物质是宇航员的尿液和活细菌。到了80年代末,细菌发电有了重大突破,英国科学家让细菌在电池组里分解分子,释放电子向阳极运动,从而产生电能。操作时还在糖液中添加某些芳香化合物作为稀释液,来提高生物系统输送电子的能力。与此同时,还要往电池里不断地充入空气,用以搅拌细菌培养液和氧化物质的混合物。据计算,

  利用这种细菌电池发电,其效率可达40%,远远高于现在使用的电池的效率,且能持续数月之久。即使这样,还有10%的潜力可挖掘。

  ③利用细菌发电原理,可以建立较大规模的细菌发电站。计算表明,一个功率为1000千瓦的细菌发电站,仅需要10立方米体积的细菌培养液,每小时消耗200千克糖即可维持其运转发电。这是一种术会污染环境的“绿色”’电站,而且技术发展后,完全可以用诸如锯末、秸秆、落叶等废有机物的水解物来代替糖液。因此,细菌发电的前景十分诱人。

  ④现在,各个发达国家各显神通,在细菌发电研究方面取得了新的进展。美国设计出一种综合细菌电池,里面的单细胞藻类可以利用太阳光将二氧化碳和水转化为糖,然后再让细菌利用这些糖来发电。日本科学家同时将两种细菌放入电池的特种糖液中,让其中的一种细菌吞食糖浆产生醋酸和有机酸,而让另一种细菌将这些酸类转化成氢气,由氢气进入磷酸燃料电池发电。

  ⑤人们还惊奇地发现,细菌还具有捕捉太阳能并把它直接转化成电能的特异功能。最近美国科学家在死海和大盐湖里找到一种嗜盐杆菌,它们含有一种紫色素,在把所接受的大约10%的阳光转化成化学物质时,即可产生电荷。科学家们利用它们制造出一个小型实验性太阳能细菌电池,结果证明是可以用嗜盐性细菌来发电的,用盐代替糖,其成本就大大降低了。由此可见,让细菌为人类供电已经不再遥远,不久的将来即可成为现实。 (选文有改动)

  1.请给选文拟一个恰当的题目。(2分)

  答:

  2.文章第②段介绍英国科学家在研究利用细菌电池发电时,为了提高发电效率,操作时采取了哪些措施?(2分)

  答:

  3.文章第②段中加着重号的“这样”指的是什么?(2分)

  答:

  4.文章第④段说明的内容是什么?(2分)

  答:

  5.文章第⑤段画线句子运用了什么说明方法?简要分析它的作用。(3分)

  答:

  6.利用细菌发电除了发电效率高之外,还具有哪些优越性?(3分)

  答:

  (三)阅读下文,完成问题

  成全一棵树

  ①一个平常的春天,一位饱经风霜的母亲,向别人讨了几棵树苗。她要把树苗栽在门前。

  ②母亲栽完树后,她的孩子从屋里一拐一拐地走出来。“妈妈,把这棵小树也栽下吧!”孩子的手里擎着一棵树苗。那是她丢弃的一棵。它又瘦又小,甚至还有一些枯萎。孩子吃力地站在母亲的面前。他是她最小的孩子,一出生就残疾。孩子擎着那棵树苗,满眼里都是渴求的光芒。母亲望着孩子站立不稳的腿,她就豫了。她认为孩子是在做着一件没有结果,同样也没有意义的事情。等看到孩子眼里的那片灼灼的光芒,母亲终于点点头——就算它最终长不成一棵大树。

  ③孩子高兴极了,他小心翼翼地放下树苗,抢着去挖树坑。他人小力气弱,挖得很吃力。母亲要替他挖,他不肯,硬是自己挖成了。孩子挖的树坑比母亲挖得都大、都深。

  ④树苗栽种下了,孩子一拐一拐地拎着水桶,给每一棵树浇水。母亲看着,心里想着,这棵树能长大吗?做母亲的目光是复杂的。她真的不相信那棵树苗会活过来,会长成一棵大树。

  ⑤可是不久,那棵树苗和其他树苗一样,也鼓出了叶子。只不过稍迟了几天,叶片稍细小了些。可不管怎么说,它活过来了,它也是一棵树了。

  ⑥每一天,孩子都要拎着水桶浇树苗。孩子是认真的。他浇水也不厚此薄彼,一棵小树一桶水。那棵由他乞求母亲允许亲手挖坑栽种的小树苗,孩子也只浇一桶水。

  ⑦小树一天一天长大了。开始的时候,那棵小树明显地不如其他的树壮实,显得有些楚楚可怜。可是第二年夏天,它竟然慢慢地赶上了它们。

  ⑧这一年冬天,母亲做出了一项重大决定,送她这个残疾的孩子也去读书。而在此之前,她是不想,也难有这个能力让这个孩子去学校。孩子背着母亲用布片为他缝制的书包,高高兴兴上学去了。他一拐一拐地走向学校,可他的脸上却是永远像春天一样明丽灿烂!

  ⑨放了学,除了做作业,孩子就浇那几棵树,一拐一拐地拎着水桶奔走在水塘和树之间。春去秋来,那棵本来已经失去了生存资格的树,比别的树是青春是挺拔。

  ⑩孩子每天都是高高兴兴的。别人送给他一个绰号:阳光。大家都叫他阳光。他也喜欢这个绰号。

  ⑾几十年过去了,拐腿的孩子已经成了一位著名的作家。这一年,他回到了家乡,母亲早已是满头银发了,儿子归来的消息使她分外高兴,这一天她早早候在门口迎接儿子。和母亲同在门口的还有那几棵树。

  ⑿他是坐着轿车回来的。他没有让车子进村,在村头他就下来,一拐一拐地走向自己的家。

  ⒀远远地,他就看到了家门口的树——高大的、快有一抱粗的树。他看见了自己的母亲。她依着树。他心里一热,急急地奔了过去。在那棵他亲手栽种的树下,他把母亲接在怀里。他发现母亲真的老了,身子轻得像一片树叶。他叫了一声娘,就再也说不出话来。

  ⒁他在老屋里住了半个月,每天都一拐一拐地扶着母亲到树下的青石板上坐,陪着母亲说话。有一天说起身边的树,他忽然神秘地说,“娘啊,你知道这棵树为什么比别的树长得快吗?这里面,有一个谁也不知道的秘密呢!”

  ⒂母亲望着巳人到中年的儿子,望着他那一脸的得意,她平静地笑了,点点头说:“其实娘早就知道了。那树长得高长得快,还不是你每天半夜起来喂它一泡童子尿?开始我也纳闷,后来有一天半夜我悄悄地跟着你,看见你一边喂它一边说小树快快长大吧……孩子,你知道我为什么改变了主意,让你上学堂吗?就是因为我看见你天天半夜里去偷偷喂那树啊!”

  ⒃他一下子怔住了。

  ⒄他百感交集。许久许久,他噗通一声跪了下来,跪在了母亲的面前。

  ⒅他明白了。他终于明白了母亲。母亲的心永远是一颗母亲的心。

  1、第④段画线句“这棵树能长大吗?做母亲的目光是复杂的”,请联系上下文,品读出母亲此时复杂的目光:

  2、第⑧段画线句“母亲做出了一项重大决定”,请联系全文,写出促使母亲做出这项决定的最主要的一件事。

  3、第②、④、⑧、⑨段中“一拐一拐”共出现4次,作者突出这一细节的用意:

  4、如何理解题目“成全一棵树”的含义。

  期末质量检测参考答案。

  一、1.略 2.略 3. 略 4.略 5.略

  二、(一)6.树林的上面和下面 离开 7.滁州人、宾客 8.《醉翁亭记》9.醉能同其乐,醒能述以文 10.醉能同其乐 11.衬托太守之乐 12.表达了作者与民同乐的高尚精神

  (二) 13.(2分) 示例一:细菌发电前景广阔 示例二:21世纪将是细菌发电的时代 (答出“细菌发电”1分,答出“发展前景”的意思1分) 14.(2分) 采取了两种措施:一是在糖液中添加某些芳香化合物作为稀释液。二是往电池里不断地充人空气。(每点1分。意思对即可) 15.(2分) “这样”是指利用细菌电池发电效率高达40%,且能持续数月之久。 (每点1分。意思对即可) 16.(2分) 文章第④段说明了各个发达国家各显神通,在细菌发电研究方面取得新进展。 (答出“各显神通”的意思1分,答出“新进展”的意思1分) 17.(3分) 画线句子运用了举例子、列数字的说明方法。(答出两种说明方法1分,只答—种不得分)具体准确地说明了细菌还具有捕捉太阳能并把它直接转化成电能的特异功能。(答出“具体准确”1分,结合内容1分。意思对即可) 18.(3分) 绿色环保(不污染环境);发电成本低廉。 (答出一点1分,答出两点3分。意思对即可)

  (三) 19、借物抒情或托物言志。其它略。20、但愿人长久,千里共婵娟。21、(1)逆境中巍然屹立;(2)一切顺其自然。22、人和事:老祖母采荠菜;婉如匆匆而去的影子;虎子咪咪在二月兰丛里嬉戏;文革遭劫难成了“不可接触者”;文革后“极可能接触者”。好处:以小见大,体现真情。23、欢:到处听到的是美好的言词,到处见到的是和悦的笑容。悲:然而,一回到家,虽然德华还在,延宗还有。可我的老祖母到哪里去了呢?我的婉如到哪里去了呢?

  三、1(1) 那棵树又瘦又小,甚至还有一些枯萎。母亲担心它不会长成一棵大树。

  (2) 孩子做这件事可能没有结果,也没有意义。

  (3) 孩子一生下来就残疾,母亲为孩子的将来忧虑。

  2母亲看到孩子天天半夜偷偷给那树喂童子尿。

  3.一是强调他是个残疾的孩子;二是突出孩子的自强

  4.从全文看,本文既写了孩子成全了一棵树苗 的经过,又写了母亲成全了一个孩子的经过,这两条线索交叉进行,从而突出了文章的主旨。

  八年级上册英语期末试卷及答案

  一、听力见附件

  二、单项填空(每小题1分,共15分)

  16.-who cooked the lunch today? - I _______.

  Adid B.does C.was D.do

  17. -Will you please _______ the TV? - I want to see the Animal World.

  A. turn off B. turn down C. turn on D. turn up

  18.-The banana is too big. -You can ______ first.

  A. cut up them B. cut them up C. cut it up D. cut up

  19. There a concert sometime next week.

  A. is going to be B. are going to be C. is going to have D. is gong to has.

  20.-Hi, Amy! How __________ your school trip to the beach?

  -Hi, Tom! We __________ a good time there.

  A. is, having B. was, had C. are, had D. were, have

  21. - How long did he_________ ? -For 12 years.

  A. start swimming B. started swimming C. swim D. swam

  22.The man was born ________1976.

  A. in the 24th of June. B. on the 24th of June C. in June 24th D. for June 24th

  23. Tina's sister began to ride a bike to school ___________.

  A. when 6 years old B.at the age of 6 C. at the age of 6 years D. at 6 years old

  24.Does your father often go to work__________?

  A. by a train B. on a train C. take a train D. catch a train

  25. It was an ___________soccer game. The soccer fans were very _____.

  A. exciting, exciting B. exciting, excited C. excited, excited D.excited, exciting

  26. It's raining. You _________ out now.

  A. had better not go B. had not better go C. should go D. didn't have better go

  27. She didn't answer the question, her mother kept her _______ for an hour.

  A. standing B. to stand C. stood D. stand

  28.-_________ we keep the room clean enough all the time?

  -No, you _________.

  A. Must; doesn't have to B. Do; don't have to

  C. Must; don't have to D. Must; mustn't

  29.What's ____________ food in China?

  A. popular B. more popular C. the most popular D. most popular

  30. Alice stopped ____________ TV and started doing her homework.

  A. watch B. watching C. watched D. to watch

  三、完形填空每((每小题1.分,共10分)

  What do the people usually do on weekends? Some people like to 31 at home, but others like to go out for a walk or play football. Mr Smith 32 hard in a factory during (在期间) the 33 . On the weekends, he usually 34 the same thing. On Saturday he washes his car and on 35 he goes with his family to a village(村庄) by car. His uncle and aunt 36 a farm there. It isn't a big one, but there is always 37 to do on the farm. The children help with the animals and give them some 38 . Mr and Mrs Smith help in the field. At the end of the day, they are all 39 and Mr Smith's aunt 40 them a big meal.

  3 l. A. play B. stay C. be D. so

  32. A. works B. does C. makes D. studies

  33. A. day B. year C. week D. month

  34. A. does B. do C. make D. has

  35. A. Friday B. Saturday C. Thursday D. Sunday

  36. A. have B. has C. bring D. find

  37. A. many B. much C. any D. most

  38. A. food B. rice C. cakes D. fruit

  39. A. full B. angry C. hungry D. happy

  40. A. give B. puts C. makes D. does

  四、 阅读理解(每小题2分,共20分)

  Every year there is the Spring Festival in China. Usually it is in January or February. It's the most important festival in China. So before it comes, everyone has to prepare things. They buy beef, pork, chicken, fruit and many other things. And they often make a special kind of food called "dumplings". It means "come together" in Chinese. On the day before the festival, parents buy new clothes for their children and children also buy presents for their parents. On the festival eve, all the family members come back to their home. This is a happy moment. They sing, dance and play cards. When they enjoy the meal, they give each other the best wishes for the coming year. They all have a good time.

  41. Which is the most important festival in China? .

  A. Mid-autumn Festival B. Spring Festival

  C. Children's Day D. May Day

  42. The Chinese usually have their Spring Festival in .

  A. January or February B. February or March

  C. September or October D. December or January

  43. What's the special kind of food for the Spring Festival in China? .

  A. Pork B. Fish C. Dumplings D. Noodles

  44. The food "dumplings" mean " ".

  A. be delicious B. be hungry C. come together D. come back

  45. When they are having dinner on the festival eve, the Chinese

  A. sing, dance and play cards B. buy each other presents

  C. never drinks D. give each other the best wishes

  B

  Ann's grandpa was very rich and he had some shops. The old man began to learn drawing

  when he was sixty, and he loved it very much. For twelve years he drew a lot and there were many pictures in his workroom. He was pleased with them and kept them well. One day, the

  old man was ill. He had to stay in hospital. Before he died, he said to Ann, "I want to give

  my pictures to a school as presents. Then the students can remember me forever. But I don't

  know which school I'm going to give them to. Can you help me? " "Well, " said the little girl, "you'd better give them to a blind school. "

  46. Ann's grandpa was ____________.

  A. a driver B. a teacher C. a blind man D. a rich man

  47. The old man tried his best to be ____________.

  A. an artist B. a farmer C. a doctor D. a teacher

  48. The old man loved ____________ very much when he was sixty.

  A. writing B. his shops C. money D. drawing

  49. When the old man was in hospital, he was ____________ years old.

  A. 60 B. 70 C. 72 D. 78

  50. Ann thought her grandpa's pictures were ____________.

  A. nice B. beautiful C. good D.

  阅读下面短文,完成第II卷第五大题B)部分的51-55小题。 每题1分,共5分

  Mr Smith had two sons .One is seven years old, and the other is five. One morning during the holidays, when he was cleaning the car, his younger son came and asked him for some money for sweets.

  "Sweets are bad for your teeth," Mr Smith said. "Take these two oranges instead ,and give one to your elder(年长的)brother," One of the oranges is quite a lot bigger than the other one ,and as the small boy liked oranges very much, he kept that one for himself, and gave his brother the smaller one.

  When the other boy saw that his brother had a much larger orange than his own ,he said to him, "It's selfish(自私的)to take the bigger one for yourself. If father had given me the oranges, I 'd have given you the bigger one."

  "I know you would," answered his brother." That's why I took it."

  51. What was Mr Smith doing one morning?

  52.What did his younger son ask for?

  53.Did the son get what he wanted?

  54Who got the bigger orange?

  55.Why did the elder brother say that his brother was selfish?

  ___________________________________

  五、词汇(每小题1.5分,共15分)

  A) 根据句意及首字母提示补全单词。

  56. Beijing U____________ is famous in the world. I want to study there some day.

  57. We are good friends. I think the f______________ between us will last forever.

  58.You’d better c________ the answers again before handing it in .

  59.His father is an e . He can plan the making of bridges.

  60.Let’s find some i____________ about Bill Gates on the Internet.

  B)用括号内单词的适当形式填空。

  61. We________ (win) the first prize in the sports meeting last night.

  62.We ____________(visit)that factory next week.

  63. The weather is good for ____________. (钓鱼)

  64. We can’t read in the ________ ( noise ) room .

  65. The weather report says it will be much ________ ( dry ) later on .

  六、句型转换(每小题1分,共9分)

  66.Jack is going to be a basketball player when he grows up. (对划线部分提问)

  _________ _______ Jack _________ ________ _________ when he grows up?

  67.Pour the milk into the blender, Lily.(改为否定句)

  __________ _________ the milk into the blender, Lily.

  68.Her son has a toothache. .(对划线部分提问)

  ____________ __________ with her son?

  69The man is very weak . He can’t carry the bag. (改为同义句)

  The man is ________ _________ ________ _________ the bag.

  70. What did he eat for this morning? I don’t know. (合并成一句)

  ---------------------------------------------------------------------------------

  71. It’s 40 minutes’ bike ride from here. (对划线部分提问)

  ___________ ___________ is it from here?

  72.. They exercise two hours a day. (对划线部分提问)

  _______ ________ do they exercise a day?

  73. She bought some eggs yesterday.(否定句)

  She __________ __________ any eggs yesterday.

  74. She thinks I am right. (否定句)

  She _________ think I _________ right.

  七、根据所给汉语提示补充完整句子。(每小题2分,共10分)

  75.中国以长城而闻名于世。

  China __________ _________ __________ the Great Wall.

  76.Tony 有时和朋友闲逛。

  Tony ______ with his friends at times.

  77我很遗憾你的休息日过得不愉快。

  I’m sorry you didn’t __________ _________ __________ your day _________.

  78.我本周末有太多的家庭作业要做。

  I have ________ ________ ________ _______ do this weekend.

  79.孩子能参加这个比赛吗?

  Can a kid the competit

  八、情景交际。从方框中选择可以回答下列问题的适当的答语(每小题1分,共10分)

  

八年级上册英语期末试卷及答案

 

  A. I take the subway.

  B. When she was four.

  C. It was wonderful.

  D. I have a sore back.

  E. I’m going to be a pilot.

  F. Yes, sure.

  G. We need three.

  H. No, there weren’t.

  I. Yes, I did.

  J. He was born in 1990.

  79. Could you do the laundry?

  80. What are you going to be when you grow up?

  81. When was he born?

  82 Were there any sharks?

  83 Did you go to the park?

  84 When did she become famous?

  85 How many bananas do we need?

  86. How was your school trip?

  87. How do you get to school?

  88. What’s wrong with you?

  79_________ 80._________ 81.__________ 82__________ 83_________

  84_______ 85_________ 86.__________ 87.__________88__________

  十、根据下列几个问题,以I'm going to be a/an…为题写一篇80字左右的文章(11分)

  1.What are you going to be when you grow up?

  2.Why are you going to be that?

  3. How are you going to do that?

  4.Where are you going to work? Why?

  人教版八年级上册数学期末试卷及答案

  一、选择题(每小题3分,共30分):

  1.下列运算正确的是( )

  A. = -2 B. =3 C. D. =3

  2.计算(ab2)3的结果是( )

  A.ab5 B.ab6 C.a3b5 D.a3b6

  3.若式子 在实数范围内有意义,则x的取值范围是( )

  A.x>5 B.x 5 C.x 5 D.x 0

  4.如图所示,在下列条件中,不能判断△ABD≌

  △BAC的条件是( )

  A.∠D=∠C,∠BAD=∠ABC

  B.∠BAD=∠ABC,∠ABD=∠BAC

  C.BD=AC,∠BAD=∠ABC

  D.AD=BC,BD=AC

  5.下列“表情”中属于轴对称图形的是( )

  A. B. C. D.

  6.在下列个数:301415926、 、0.2、 、 、 、 中无理数的个数是( )

  A.2 B.3 C.4 D.5

  7.下列图形中,以方程y-2x-2=0的解为坐标的点组成的图像是( )

  8.任意给定一个非零实数,按下列程序计算,最后输出的结果是( )

  A.m B.m+1 C.m-1 D.m2

  9.如图,是某工程队在“村村通”工程中修筑的公路长度(m)与时间(天)之间的关系图象,根据图象提供的信息,可知道公路的长度为( )米.

  A.504 B.432 C.324 D.720

  10.如图,在平面直角坐标系中,平行四边形ABCD的顶点A、B、D的坐标分别为(0,0)、(5,0)、(2,3),则顶点C的坐标为( )

  A.(3,7) B.(5,3) C.(7,3) D.(8,2)

  二、填空题(每小题3分,共18分):

  11.若 +y2=0,那么x+y= .

  12.若某数的平方根为a+3和2a-15,则a= .

  13.等腰三角形的一个外角是80°,则其底角是 .

  14.如图,已知:在同一平面内将△ABC绕B点旋转到△A/BC/的位置时,AA/∥BC,∠ABC=70°,∠CBC/为 .

  15.如图,已知函数y=2x+b和y=ax-3的图象交于点P(-2,-5),则根据图象可得不等式2x+b>ax-3的解集是 .

  16.如图,在△ABC中,∠C=25°,AD⊥BC,垂足为D,且AB+BD=CD,则∠BAC的度数是 .

  三、解答题(本大题8个小题,共72分):

  17.(10分)计算与化简:

  (1)化简: 0 ; (2)计算:(x-8y)(x-y).

  18.(10分)分解因式:

  (1)-a2+6ab-9b2; (2)(p-4)(p+1)+3p.

  19.(7分)先化简,再求值:(a2b-2ab2-b3)÷b-(a+b)(a-b),其中a= ,b= -1.

  20.(7分)如果 为a-3b的算术平方根, 为1-a2的立方根,求2a-3b的平方根.

  21.(8分)如图,在△ABC中,∠C=90°,AB的垂直平分线交AC于点D,垂足为E,若∠A=30°,CD=2.

  (1)求∠BDC的度数; (2)求BD的长.

  22.(8分)如图,在平面直角坐标系中,点P(x,y)是第一象限直线y=-x+6上的点,点A(5,0),O是坐标原点,△PAO的面积为S.

  (1)求s与x的函数关系式,并写出x的取值范围;

  (2)探究:当P点运动到什么位置时△PAO的面积为10.

  23.(10分)2008年6月1日起,我国实施“限塑令”,开始有偿使用环保购物袋. 为了满足市场需求,某厂家生产A、B两种款式的布质环保购物袋,每天共生产4500个,两种购物袋的成本和售价如下表,设每天生产A种购物袋x个,每天共获利y元.

  (1)求出y与x的函数关系式;

  (2)如果该厂每天最多投入成本10000元,那

  么每天最多获利多少元?

  24.(12分)如图①,直线AB与x轴负半轴、y轴正半轴分别交于A、B两点,OA、OB的长度分别为a、b,且满足a2-2ab+b2=0.

  (1)判断△AOB的形状;

  (2)如图②,正比例函数y=kx(k<0)的图象与直线AB交于点Q,过A、B两点分别作AM⊥OQ于M,BN⊥OQ于N,若AM=9,BN=4,求MN的长.

  (3)如图③,E为AB上一动点,以AE为斜边作等腰直角△ADE,P为BE的中点,连结PD、PO,试问:线段PD、PO是否存在某种确定的数量关系和位置关系?写出你的结论并证明.

  参考答案:

  一、选择题:

  BDBCC.ACBAC.

  二、填空题:

  11.2; 12.4; 13.40o; 14.40o; 15.x>-2; 16.105o.

  三、解答题:

  17.(1)解原式=3 = ;

  (2)解:(x-8y)(x-y)=x2-xy-8xy+8y2=x2-9xy+8y2.

  18.(1)原式=-(a2-6ab+9b2)=-(a-3b)2;

  (2)原式=p2-3p-4+3p=p2-4=(p+2)(p-2).

  19.解原式=a2-2ab-b2-(a2-b2)=a2-2ab-b2-a2+b2=-2ab,

  将a= ,b=-1代入上式得:原式=-2× ×(-1)=1.

  20.解:由题意得: ,解得: ,

  ∴2a-3b=8,∴± .

  21.(1)∵DE垂直平分AB,∴DA=DB,∴∠DBE=∠A=30°,∴∠BDC=60°;

  (2)在Rt△BDC中,∵∠BDC=60°,∴∠DBC=30°,∴BD=2CD=4.

  22.解:(1)s=- x+15(0<x<6);

  (2)由- x+15=10,得:x=2,∴P点的坐标为(2,4).

  23.解:(1)根据题意得:y=(2.3-2)x+(3.5-3)(4500-x)=-0.2x+2250;

  (2)根据题意得:2x+3(4500-x)≦10000,解得:x≧3500元.

  ∵k=-0.2<0,∴y随x的增大而减小,

  ∴当x=3500时,y=-0.2×3500+2250=1550.

  答:该厂每天至多获利1550元.

  24.解:(1)等腰直角三角形.

  ∵a2-2ab+b2=0,∴(a-b)2=0,∴a=b;

  ∵∠AOB=90o,∴△AOB为等腰直角三角形;

  (2)∵∠MOA+∠MAO=90o,∠MOA+∠MOB=90o,∴∠MAO=∠MOB,

  ∵AM⊥OQ,BN⊥OQ,∴∠AMO=∠BNO=90o,

  在△MAO和△BON中,有: ,∴△MAO≌△NOB,

  ∴OM=BN,AM=ON,OM=BN,∴MN=ON-OM=AM-BN=5;

  (3)PO=PD,且PO⊥PD.

  延长DP到点C,使DP=PC,

  连结OP、OD、OC、BC,

  在△DEP和△OBP中,

  有: ,

  ∴△DEP≌△CBP,

  ∴CB=DE=DA,∠DEP=∠CBP=135o;

  在△OAD和△OBC中,有: ,∴△OAD≌△OBC,

  ∴OD=OC,∠AOD=∠COB,∴△DOC为等腰直角三角形,

  ∴PO=PD,且PO⊥PD.

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