教科版八年级《5.4物态变化与我们的世界》同步测试
一、选择题
1．下面列举的现象中，属于升华现象的是（）
A．夏天，冰棍周围冒“白气” B．冬天．玻璃窗上结冰花
C．衣箱中防虫用的樟脑片日久变小 D．湿衣服变干
2．夏天剥开冰棒纸时，可以看到冰棒的周围冒“白气”，这些“白气”是由空气中的水蒸气遇冷时（）
A．升华形成的 B．凝华形成的 C．凝固形成的 D．液化形成的
3．夏天,用棉被盖住冰棍,冰棍不易熔化,这是因为 ( )
A．冰棍的冷气不容易传到棉被外 B．棉被外的温度不容易传给冰棍
C．棉被外的热不容易传给冰棍 D．以上说法都不对
4．某同学做“研究影响蒸发快慢的因素”实验，如图
所示，他在两块相同的玻璃片上分别滴上一滴水，观
察图中情景可知该同学主要研究水的蒸发快慢是否与
（）
A.水的温度有关
B.水的表面积有关
C.水上方空气流动的快慢有关
D．上述三种因素都有关
二．填空题
5．吹气和哈气都是从人口出来的气．夏天用口吹气能使热水变凉，这主要是因为加速热水使水温降低．冬天对着手哈气使手变暖，这是因为水蒸气遇冷，使手的温度升高．6．冬天，挂在室外的湿衣服会结冰，但结冰的衣服最后也会干，这是现象．7．常用的液化石油气，是在条件下，用的方法使它成为液体贮存在钢瓶里的．
8．医生为病人检查牙齿时，拿一个带把的小镜子在酒精灯上稍微烤一烤，然后放入病人口腔内．这样做的目的是
9．用久了的灯泡会蒙上浅浅的黑色，这是因为钨丝受热时产生现象出现钨蒸气，在灯泡内壁上产生——的缘故．
10．火箭刚发射时，高温火焰向下喷到发射台的地面，很多物体遇到这样高温火焰将会为了保护发射台底，就建了一个大水池，让火焰喷到水中，利用水的来吸收巨大的热量，我们在电视上看到火箭升空瞬间，伴有迅速扩
展的庞大的白色气团是形成的．
11. 小明同学在探究固体熔化的活动中，作出了如图4所
示的图像。从图像可知，这种固体是（填“晶体”
或“非晶体”），它的凝固点是。
八年级英语(上)第一次月考试卷Module1---6 2007. 11 班别：姓名：分数： 听力部分(30分) 一、听句子，选画面（5分）。请把答案填入方框中。每个句子读一遍。 二、听短文，连信息（5分）。把序号填在括号内。短文读两遍。 ( ) 6、Lingling A. plays the violin ( ) 7、Steven B. plays the trumpet. ( ) 8、Helen C. is studying the guitar ( ) 9、Tony D. plays the piano ( ) 10、Tom E. plays the drum. 三、听短文，用A—E排序（5分）。短文读两遍。 ( ) 11、Zhao Yang was sad. ( ) 12、He has been back at school. ( ) 13、Zhao Yang started school. ( ) 14、He dropped out of school. ( ) 15、Project Hope gave him some money. 四、对话理解。听对话及后面的问题，选择恰当的答案（5分）。对话读两遍。 ( ) 16、A. Because his brother is ill. B. Because he has to stay in bed. C. Because he has to(不得不)look after his mother at home . ( ) 17、A. Mike. B. Kate C. Tony ( ) 18、A. Black. B. Yellow. C. White. ( ) 19、A. The time. B. The weather. C. The date. ( ) 20、At 9:20 B. At 8:40 C. At 9:00. 五、短文理解。听短文，选出5个问题的正确答案（10分）。短文读两遍。 ( ) 21、When did Robert go fishing? A. On Friday. B. On Saturday. C. On Sunday. ( ) 22、Whom did Robert go fishing with? A. Nick. B. Mike. C. Dick. ( ) 23、How did the two boys get to the river? A. On foot. B. By bike. C. By bus. ( ) 24、What time did it begin to rain? A. At 3:00pm. B. At 4:00pm. C. At 5:00pm ( ) 25、Where did Robert go the next day? A. He went home. B. He went to school. C. He went to a hospital. 笔试部分（90分）一、选择题。（20分） ( ) 1、Li Mei is _______ girl. A. a eight--year--old B. an eight--year--old C. an eight--years--old D. a eight years old ( ) 2、How about ______ the radio in English? A. to listen B. to listening C. listening to D. listen to ( ) 3、Try _____ translate every word into Chinese when you learn English. A. not to B. to not C. no to D. to no ( ) 4、A: _____ you drive to the zoo? B: OK. A. Why not B. Why don’t C. Why didn’t you D. How about ( ) 5、A: Have you ever seen her? B: _______ A. No, I have. B. No, I haven’t. C. Yes, I haven’t. D. Yes, I do. ( ) 6、A: _____ have you studied English? B: For five years. A. How soon B. How far C. How long D. How often ( ) 7、Mr. White doesn’t like pop music,__________? A. doesn’t he B. does he C. does she D. is he ( ) 8、Since 1989 Project Hope ________ schools all over China. A. has built B. have built C. has build D. build ( ) 9、She ________ to Beijing. A. has never been B. has never gone C. has ever gone D. has went to ( ) 10、Mary’s mother has travelled all________ the word. A. out B. over C. in D. out ( ) 11、Astronauts _______ yesterday. A. returned B. have returned C. return D. will return ( ) 12、His brother _______ to Ame rican. He won’t come back. A. has gone B. has been C. went D. goes ( ) 13、The ______ is a planet and it goes around the _______. A. Earth , star B. Sun, Earth C. Earth , Sun D. Earth, Star ( ) 14、_____ people will go to Beijing for the Olympic Games in 2008. A. Millions B. Millions of C. Million of D. Two millions ( ) 15、A: _____ he visited China before? B: No, he hasn’t. A. Has B. Have C. Did D. Where ( ) 16、I have two pens. One is red, _______ is black. A. other B. another C. the other D. else ( ) 17、Have you ever dreams of _______ England? A. visit B. visiting C. to visitting D. visited ( ) 18、Can you play ____ piano? I have ______ breakfast at 7:00. A. the , the B. x, the C. the, x D. the , a ( ) 19、Do you think Elvis was ____ artist or ____ engineer? A. a ,a B. the , a C. an, a D. an, an ( ) 20、It’s very ______ for you to get the book. A. luck B. luckily C. lucky D. unlucky 二、单词分类。（10分）把以下单词写到相应的横线上,使句子意思完整通顺。
2020八年级上册数学试卷 一、仔细选一选。 1．下列运算中，准确的是（） A、x3x3=x6 B、3x2÷2x=x C、(x2)3=x5 D、(x+y2)2=x2+y4 2．下列图案中是轴对称图形的是（） 3．下列各式由左边到右边的变形中，是分解因式的为（） A、a(x+y)=ax+ay B、x2－4x+4=x(x－4)+4 C、10x2－5x=5x(2x－1) D、x2－16+3x=(x－4)(x+4)+3x 4.下列说法准确的是（） A、0.25是0.5的一个平方根 B、负数有一个平方根 C、72的平方根是7 D、正数有两个平方根，且这两个平方根之和等于0 5．下列各曲线中不能表示y是x的函数的是（） 6．如图，四点在一条直线上，再添一个条件仍不能证明⊿ＡＢＣ≌⊿ＤＥＦ的是（） A．AB=DE B．.DF∥AC C．∠E=∠ABC D．AB∥DE 7．已知，，则的值为（） A、9 B、 C、12 D、 8．已知正比例函数(k≠0)的函数值y随x的增大而减小，则一次函数y=x＋k的图象大致是()
9、打开某洗衣机开关，在洗涤衣服时（洗衣机内无水），洗衣机 经历了进水、清洗、排水、脱水四个连续过程，其中进水、清洗、排 水时洗衣机中的水量y（升）与时间x（分钟）之间满足某种函数关系，其函数图象大致为（） 10．已知等腰三角形一边长为4，一边的长为10，则等腰三角形 的周长为（） A、14 B、18 C、24 D、18或24 11．在实数中，无理数的个数是（） A．1 B．2 C．3 D．4 12．已知一次函数的图象与直线y=-x+1平行，且过点（8，2）， 那么此一次函数的解析式为（） A．y=-x-2 B．y=-x-6 C．y=-x+10 D．y=-x-1 13．如果单项式与 x3ya+b是同类项，那么这两个单项式的积是（） A．x6y4 B．-x3y2 C．- x3y2 D．-x6y4 14．计算（-3a3）2÷a2的结果是（） A．9a4 B．-9a4 C．6a4 D．9a3 15．若m+n=7，mn=12，则m2-mn+n2的值是（） A．11 B．13 C．37 D．61 16．下列各式是完全平方式的是（） A．x2-x+ B．1+x2 C．x+xy+l D．x2+2a-l 17．一次函数y=mx-n的图象如图所示，则下面结论准确的是（） A．m0C．m>0，n>0 D．m>0，n-2且x≠1 D．x≥-2且x≠1
八年级上册英语练习题-CAL-FENGHAI.-(YICAI)-Company One1
Unit 1 Where did you go on vacation？ Section A 1：基本词汇 不多，很少 wonderful 在任何地方 nothing 任何人 Someone 最多，大多数 myself 某事 yourself 母鸡 seem 猪 everyone 厌倦的 dairy 2：基本词组 相当多，不少 of course 去度假 go to summer camp 任何有趣的地方 most of the time 参观博物馆 go out with 好像挺烦闷的 3：基本句型及交际用语 1：根据汉语完成句子，每空一词。 在2013年的十月你去哪儿度假了？ 我去山里了。 did you go in October ，2013？ I to the mountains。 2：杰夫，你去了一些有趣的地方吗？ 是的，我和我的朋友们去了中国的长城。 Jeff ， you go Yes，I to the Great Wall in China my friends。 3：你遇到什么特别的事了吗？ 是的，我在2013年的12月20日遇到了汪东城。 you meet Yes，I Wang Dongcheng on 20,2013. 4：韩磊好像很伤心，因为他错过了一场足球赛。 Han Lei very sad yesterday， he missed a football match。 5：上个星期日的天气怎么样？ 又热又潮湿。 the weather last Sunday？ It hot and humid。 2：补全对话，每空一词。 A：Hi，Lin 。Long time no see。 B：I my vacation。 A：Really？ did you go on vacation？ B：I to the beach。 A：How was the
新人教版八年级上册英语单词测试 ____________任何人 ____________ .任何地方n.任何(一个)地方 ____________ 精彩的；极好的 ____________ 很少的；n.少量 ____________ .最多的；大多数的； ____________ 某事物； ____________ 没有什么没有 ____________ 我自己 ____________ 每人；人人 ____________ 你自己；你亲自 ____________ 母鸡；雌禽 ____________ 无聊的；厌烦的；郁闷的 ____________.猪 ____________ .日记；日记簿(keep a diary) ____________ .似乎；好像 ____________ [某人；有人 ____________相当多；不少(后接可数名词) ____________ 当然 ____________ .活动；活跃 ____________ .决定；选定(decide to do sth.) ____________ .尝试；设法；努力 ____________ .自行车 ____________ ['b?ld??建筑物 ____________ ['tre?d?(r)] n.商人；商船 ____________ ['w?nd?(r)] v.惊奇；想知道；怀疑____________ ['d?fr?ns] n.差异；不同 ____________ [t?p] n.顶部；顶 ____________ [we?t] v.等；等待(wait for) ____________ [?m'brel?] n.伞；雨伞 ____________ [wet] adj.湿的；雨天的 ____________ 低于；在...下面adv.在下面 ____________ [?z] 如同；像...一样 ____________ [?'n?f] 足够的adv.足够地；充分地 ____________ [d?k] n.鸭肉；鸭 ____________ ['h??ɡri] adj.饥饿的；渴望的 ____________想要 ____________ [d?s'la?k] v.不喜欢；厌恶____________因为；由于 Unit2 How often do you exercise? ____________ .家务劳动 ____________ 几乎不；简直不；刚刚 ____________ 曾经；在任何时候 ____________ 一次；曾经 ____________ .两倍；两次 ____________ 因特网 ____________ 节目；程序；课程；节目单 ____________ 满的；充满的；完全的 ____________ 摇摆；秋千v.摇摆；旋转 ____________ 或许；也许；可能 ____________摇摆舞 ____________ 最小的；最少的 ____________至少 ____________很少；几乎从不；难得 ____________ n.垃圾；废旧杂物 ____________ ['k?fi] n.咖啡；咖啡色 ____________ [helθ] n.健康；人的身体或精神状态 ____________ [r?'z?lt] .结果；后果 ____________ [p?'sent] adj.百分之...的 ____________ [??n'la?n] adj.在线的adv.在线地 ____________ ['tel?v??n] n.电视机；电视节目 ____________ [??l'e??] conj.虽然；尽管；然而； ____________ [θru?] prep.穿过；凭借；一直到 ____________ ['b?di] n.身体 ____________ [ma?nd] .头脑；想法；意见；心 ____________ [s?t?] adj.这样的；如此的
文华学校09暑八年级英语上测试一 一．根据意义写单词。 1.h not nearly 2.t two times 3.d not the same 4.u not good for health 5.s begin 二．单项选择。 1. do you surf the Internet？Once a week. A How B How old C How often D How many times 2.Can you how often you do things？ A talk B talk about C speak D tell of 3.You hardly know，？ A are you B aren’t you C do you D don’t you 4.Are you late for class？。 A Yes，never B Yes，sometimes C No，ever D No，usually 5. homework，most students do it every day。 A With B For C As D As for 6.His mother wants him good food. A eat B to eat C eating D eats 7.He tries English and he practices English every day. A to learn，to speak B learning，speaking C to learn，speaking D learning，to speak 8.It makes me. A no difference to B no different to C not difference from D not different from 9.Can you help me up the waste things？ A cleaning B with clean C of cleaning D to clean 10. it is rainy today，he still works outside. A Although，but B But，although C /，although D Although，/ 11. he was not rich，he bough a lot of books for his son. A But B While C Although D Because 12.—does Michael do on weekends？ —He often goes to the library. A How B What C Where D Why 13.She hardly eats junk food，？ A doesn’t B does she C isn’t she D is she 14. do you watch TV？ —I watch TV three times a week。 A How many times B How often C How much D How soon 15.Mｙfather wants me vegetables every day。 A to eat B eating C eats D eat 16.Have you ever been to Shenzhen？No， A ever B never C some times D usually 17.Drinking milk and eating vegetables our health. A are good for B are good at C is good for D is good at 18.Your pen is mine. A a same to B the same to C a same for D the same as 19.A lot of vegetables us to keep in good health. A make B want C help D ask 20.She looks pale and weak after her illness。 A kind of B kinds of C a kind of D a kind 三．用所给词的适当形式填空。 1.This book is （difference）from that one。 2.These exercises help me （study）more。 3.Mum asked children to eat it （two）a week。 4.If you’re kind of （health），you must do more exercise. 5.She （say）it’s good for you。 6.Most （write）are young people。 7.Let him （look）after his brother。 8.He likes （play）chess。 9.We often help teacher （clean）the blackboard。 10.They want （go）shopping tomorrow。 四．句型变换。 1.She often goes to the movies on weekends. （一般疑问句） _______ she often to the movies on weekends？ 2.I drink milk every day.（否定句） I milk every day. 3.Li Lei sleeps for nine hours every day。（提问） Li Lei sleep every day？ 4.They eat junk food once or twice a week。（提问） they eat junk food？ 5.Children like Animal World best。（提问） children like best？ 6.He didn’t go to school yesterday，I think。（合成一句） I he to school yesterday。五．完形填空。 Billy is a boy of fifteen. His parents died three years ago. One day when he was walking in the street，he 1 a wallet lying on the ground. He returned it to the owner，Mr Baker gave his 2 to the boy. As the boy has no job，Mr Baker made him work for him in his 3 .Billy worked so hard that Mr and Mrs Baker were 4 with him. Mr Baker loved planting 5 .The week before last，he brought a few trees home，planted them in the 6 himself and watered them every day. Several days 7 , he had to leave for an another city on business. Before he started，he said to Billy, “Take good care of the trees.
数学测评题(八年级上册) 本试卷分第Ⅰ卷和第Ⅱ卷两部分。第Ⅰ卷微选择题，满分50分。第Ⅱ卷为填空题和解答题，满分50分。本试卷共20道题，满分100分，考试时间70分。 第Ⅰ卷选择题(共50分) 一、选择题：（每题5分，共10分） 1.下列能构成直角三角形三边长的是（） A. 1、2、3 B. 2、3、4 C. 3、4、5 D. 4、5、6 2. 在下列各数中是无理数的有( ) -0.333…, 4, 5, π -, 3π, 3.1415, 2.010101…(相邻两个1之间有1 个0),76.0123456…(小数部分由相继的正整数组成). A. 3个 B. 4个 C. 5个 D. 6个 3. 若规定误差小于1,那么50的估算值是( ) A. 7; B. 7.07; C. 7或8; D. 7和8. 4．10名初中毕业生的中考体育考试成绩如下：25，26，26，27，26，30，29，26，28，29，这些成绩的中位数是（） A. 25 B. 26 C. 26.5 D. 30 5. 一个多边形每个外角都等于300, 这个多边形是( ) A.六边形; B.正八边形; C.正十边形; D.正十二边形. 6．以下五家银行行标中，既是中心对称图形又是轴对称图形的有（）
A. 1个 B. 2个 C. 3个 D. 4个 7．下列说法错误的是( ) A. 1)1(2=- B. ()1133 -=- C. 2的平方根是2± D. ()232)3(-?-=-?- 8．一根蜡烛长20cm ，点燃后每时燃烧5cm ，燃烧时剩下的高度h （厘米）与时间t （时）之间的关系图是（ ） h h h h 0 t 0 t 0 t 0 t A. B. C. D. 9．已知：如图1，梯形ABCD 中，AD ∥BC ，AB=CD ，对角线AC 与BD 相交于点O ，则图中全等三角形共有（ ） A. 1对 B. 2对 C. 3对 D. 4对 10．2002年8月在北京召开的国际数学大会会标取材于我国古代数学家赵爽的《勾股圆方图》，它是由四个全等的直角三角形与中间的小正方形拼成的一个大正方形（如图2）。如果大正方形的面积是13，小正方形的面积是1，直角三角形较短直角边为a ，较长直角边为b ，那么（a+b ）2的值为（ ） A. 13 B. 19 C. 25 D. 169 图1 图2 O D C B A
最新人教版八年级英语上册单元测试题及答案全套Units 1～2综合检测卷 时间：120分钟满分：120分 听力部分(共25分) Ⅰ.听句子，选择正确的答语。听两遍。(5分) ()1.A.It was wonderful. B．I went to the beach. C．By train. ()2.A.Yes，they did. B．On Monday. C．His father. ()3.A.It's an umbrella. B．I was very hungry. C．It was very delicious. ()4.A.She went shopping. B．She was bored. C．It was beautiful. ()5.A.Take photos. B．Last month. C．Very tired. Ⅱ.听对话，选择正确的答案。听两遍。(5分) ()6.Where did the girl go during her vacation? A. B. C. ()7.What kind of junk food does Peter love to eat? A. B. C. ()8.What does Ann often do on weekends? A. B. C. ()9.How was the weather yesterday? A. B. C. ()10.What did Alice buy for himself in Beijing? A. B. C. Ⅲ.听两段对话，选择正确的答案。听两遍。(5分) 听下面一段对话，回答第11至12小题。 ()11.How long did Susan stay in Australia? A．For half a month. B．For a month.
人教版八年级上册英语期末测试卷及答案 LEKIBM standardization office【IBM5AB- LEKIBMK08- LEKIBM2C】
八上英语试卷 （总分：100分时间：100分钟） 第?卷 (共60分) Ⅰ.单项选择。（每小题1分，共15分） （）1. Yesterday I only bought _________ for my cousin, but __________ for myself. A. something; something B. nothing; something C. nothing; nothing D. something; nothing （）2. We _________ our holidays in Hong Kong next year. A. visited B. spent C. are going to visit D. are going to spend （）3. My sister is as __________as her classmate Joe, so they are good friends. A. outgoing B. more outgoing C. the more outgoing D. the most outgoing （）4. Of all the boys, John does his homework ___________. A. more careful B. the most careful C. more carefully D. the most carefully （）5. There _________ a book sale in our school next month. A. will be B. will have C. was D. has （） Smith plans _________ here much longer because he has lots of things to do. keep B. keep C. to stay D. stay （）7. ——Does your brother __________ play soccer? ——Yes. He plays it every day. A. often B. never C. hardly ever D. sometimes （） son is going to study medicine when he __________ school. A. leave B. leaves C. is leaving D. left （）9.——Will you go boating this Saturday? ——___________. We will camp by lake. A. Yes, we will. B. No, we won’t. C. Yes, we do D. No, we don’t. （）10. ——Do you know Lin Shuhao ——Yes, he is one of ____________ basketball player in NBA. A. popular B. more popular C. the most popular D. the more popular （）11. ——We’ll have a picnic _______ it doesn’t rain tomorrow. ——Have a nice day. A.when B. because C. if D. since （）, get some eggs and butter and _________. A. mix up them B. mix them up C. mix up it D. mix it up
B D E C A 八 年 级 第 一 学 期 期 末 试 卷 数 学 2018．1 班级 姓名 成绩 一、选择题（本大题共30分，每小题3分） 在下列各题的四个备选答案中，只有一个是正确的．请将正确选项前的字母填在表格题号 1 2 3 4 5 6 7 8 9 10 答案 1形的是 A B C D 2．下列计算正确的是 A ．325a a a += B ．325a a a ?= C ．23 6 (2)6a a = D ．623a a a ÷= 3．叶绿体是植物进行光合作用的场所，叶绿体DNA 最早发现于衣藻叶绿体，长约0.00005米．其中，0.00005用科学记数法表示为 A ．4 0.510-? B ．4 510-? C ．5 510-? D ．3 5010-? 4．若分式 1 a a +的值等于0，则a 的值为 A ．1- B ．1 C ．2- D ．2 5．如图，点D ，E 在△ABC 的边BC 上，△ABD ≌△ACE ，其中B ，C 为对应顶点，D ，E 为对应顶点，下列结论不． 一定成立的是 A ．AC =CD B ．BE = CD C ．∠ADE =∠AED D ．∠BAE =∠CAD 6．等腰三角形的一个角是70°，它的底角的大小为 A ．70° B ．40° C ．70°或40° D ．70°或 55° 7．已知2 8x x a -+可以写成一个完全平方式，则a 可为 A ．4 B ．8 C ．16 D ．16- 8．在平面直角坐标系xOy 中，以原点O 为圆心，任意长为半径作弧，分别交x 轴的负半轴和y 轴的正半轴于A 点，B 点．分别以点A ，点B 为圆心，AB 的长为半径作弧，两弧交于P 点．若点P 的坐标为（a ，b ），则 A ．2a b = B ．2a b =
英语人教版八年级上检测题 姓名___________ 一、单选题(25分) ( ) you have______to say for yourself ---No,I have______to say. ;;;;nothing ( ) and I______tennis yesterday. He did much better than I. play playing ( ) went into his room and ______to work. begin ( ) don’t want to go to the museum,it’s too_______. A. relaxing B. boring C. bored ( ) didn’t go to the mountains ______the bad weather. of ( ) you enjoy______photos take ( ) afternoon, we______to the park. ( )’s cold, so we decided______at home.
stay ( )’t forget______your homework tomorrow. bring ( ) didn’t______me about it. （） ______sunny today，but it ______ cloudy yesterday. A．is；is B．was；wasC．is；was D．was；is （）12．I ______ at school now，but I ______ at home an hour ago. A．am；am B．was；wasC．am；were D．am；was （）13．—______ there any students in the classroom —No，there aren' there ______ some half an hour ago. A．Are；were B．Were；areC．Are；are D．Were；were （）14．—Where ______ you last night —I ______ at home. A．are；am B．am；amC．were；was D．were；were （）15．—______ Nancy at home last weekend —No，she was in the library with her friends. A．Is；isn't B．Was；wasn'tC．Did；didn't D．Was； isn't （）16．—______ did you ______ for dinner
D C B A 第8题 抚远四中八年级英语班数学试卷 时间：120分钟 满分：120分 姓名:____________得分:________ 一、细心填一填（本大题共3小题，每小题3分，共30分） 1. 在以下绿色食品、回收、节能、节水四个标志中，是轴对称图形的是（ ） A ． B ． C ． D ． 2．下列运算中，正确的是（ ） A 、 (x 2)3=x 5 B 、3x 2÷2x=x C 、 x 3·x 3=x 6 D 、(x+y 2)2=x 2+y 4 3．已知M （a ，4）和N （3，b ）关于x 轴对称，则2011)(b a +的值为 A ．－1 B ．1 C ．－20117 D ．20117 4．如图，在△ABC 中，AD=BD=BC ，若∠C=25°，则∠ADB 的度数是（ ） A. 80o B. 60o C. 50o D. 100o 5. 如图，在△ABC 中，AB=AC ，∠C=30°，∠BAD=90°， AD=4cm ，则BC 的长为 A ．4cm B ．8cm C ．10cm D ．12cm 6.已知x 2+kxy+64y 2 是一个完全式，则k 的值是（ ） A ． 8 B ．±8 C ．16 D ．±16 7．已知 ， ，则 的值为（ ）。 A 、9 B 、 C 、12 D 、 8.如图，△ABC 中边AB 的垂直平分线分别交BC 、AB 于点D 、E ，AE=3cm ，△ADC?的周长为9cm ，则△ABC 的周长是（ ）A ．10cm B ．12cm C ．15cm D ．17cm 9. 如图，在△ABC 中，AB=AC ，AD 是∠BAC 的平分线，DE ⊥AB 、DF ⊥AC ，垂足分别为E 、F ，则下列四个结论： ①AD 上任意一点到点C 、B 距离相等；②AD 上任意一点到边AB 、AC 距离相等；③BD=CD ，AD ⊥BC ；④∠BDE=∠CDF ，其中正确的个数为（ ） A. 1 B. 2 C. 3 D. 4 10、甲、乙两人分别从两地同时出发，若相向而行，则a 小时相遇； 若同向而行，则b 小时甲追上乙.那么甲的速度是乙的速度的（ ） A. a b b +倍 B. b a b +倍 C.b a b a +-倍 D. b a b a -+倍 二、精心选一选（大题共10小题，每小题3分，共30分） 11、1纳米=0.000000001米，7.5纳米用科学记数法表示为 _______________________。 12、0 (3)π-＝ ；若分式2 4 2--x x 的值为0， 则x 的值为 ．当x 时，分式 2 2 -+x x 有意义。 13、等腰三角形的两边长是4和8，周长为______． 14、把216a +-分解因式__________。 15. 如图，∠AOB=30°，OC 平分∠AOB ，P 为OC 上任意一点； PD ∥OA 交OB 于D ，PE ⊥OA 于点E ，若OD=4 ，则PE=__ __. 16、三角形的三边长分别为5，1+2x ，8，则x 的取值范围是________． 17. 计算(-3x 2y 2)2·(2xy)3÷(xy) 2 =____;()1 3 143272π-??---+ ? ?? ______． 18. 如果一个正多边形的内角和是900°，则这个正多边形是正______边形． 19、.若关于x 的分式方程2 33 x m m x x -=--无解，则m 的值为 ． 20.如图所示，在边长为2的正三角形ABC 中，E 、F 、G 分别为AB 、AC 、BC 的中点，点P 为线段EF 上一个动点，连接BP 、GP ，则△BPG 的周长的最小值是 . 三、用心画一画、算一算（共20分） 21．（本小题６分）作图题（不写作图步 骤，保留作图痕迹）．如图，OM,ON 是 两条公路，A,B 是两个工厂，现欲建一个仓库P ，使其到两条公路距离相等且到两工厂距离相等，请你确定该仓库P 的位置。 22.计算与 解方程（每题6分） （1）x x x x x x x x 4)44122(22-÷+----+ （2） 解方程求x ：11 4112 =---+x x x （第21题） O N M · ·A B 第20题图 A B C D （第5题图） C (15) P D A B E O
Unit 4水平测试 笔试部分(共80分) ◆I.单项选择(15分) ( )21. It is very cold ______ northern China in winter. A. on B. in C. at D. To ( )22. Let’s go to the ______ this evening. There is a new movie. A. library B. hospital C. cinema D. Shop ( )23. On National Day many shops are going to _____ their prices. The things are cheaper. A. cut B. add C. keep D. improve ( )24. We all like the new theater in our town. It has _______ seats and big screens. A. expensive B. friendly C. comfortable D. heavy ( )25. —______ is the best radio station? —It is behind the bank. A. When B. What C. Which D. Where ( )26. It is hard for them ________ the work in three days. A. finish B. to finish C. finishing D. finished ( )27. —Which skirt do you like of the three? —I think the red one is _____ of them. A. nice B. nicer C. nicest D. the nicest ( )28. Eliza __________ a beautiful song at the singing contest. She won first prize. A. sings B. is singing C. sang D. sing ( )29. I want to join the art club, ______ I like drawing. A. because B. so C. though D. but ( )30. —Do you know ______ the watch is in the store? —Yes. It’s twenty dollars. A. how much B. how long C. how far D. how many ( )31. I’d like to drink another cup of tea. I’m _____ thirsty. A. yet B. hardly C. still D. never ( )32. —What do you ______ this activity? —It’s very interesting. A. hear of B. look for C. come over D. think about ( )33. Jack is ten years old. He is ______ to help his mother do the chores. A. enough old B. old enough C. enough young D. young enough ( )34. —________ you sing? —Yes. I am good at it. A. Need B. Must C. Can D. Should ( )35. —Let’s go and play football after school. —_______. A. Good idea B. Thanks a lot