周末练习6
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周 末 练 习 六一、按指定的运算顺序分别给“2×24+48÷3”添上括号,算出结果。
加 除 乘 乘 加 除 除 加 乘 加 乘 除二、连一连。
三、把下面的每一组算式合并成一个综合算式:75×4=300 925+285=1210 27+33=60300-75=225 1210÷605=2 180×3=540225÷25=9 150×2=300 540÷60=9综合算式 综合算式 综合算式四、计算。
146+180÷9×5 35×(400-400÷25) 230×3-490÷7(960-240÷15)×12 2700÷[18×(51-46)] [(42+38)×5]×26五、列综合算式计算。
1.用144除以12的商乘98与70的差,积是多少?2.180减去48与24的差,再除以12,商是多少?120+60-20÷5 120÷60+20×5 120-60+20×5 120+60×20÷5 360 176 160 102六、解决问题1.给一间会议室铺地砖,用面积36平方分米的地砖100块正好铺满。
如果改用边长5分米的地砖,至少需要多少块?2.一本书有320页,小明前10天每天看20页,剩下的他准备每天看6页,那么还要多少天才能全部看完?3.书架上层有80本书,下层的比上层的4倍还多12本,这个书架上一共有多少本?4.同学们参加暑期夏令营,低年级有28人参加,高年级的人数比低年级的17倍还多16人。
如果每13人合住一顶帐篷。
那么低年级、高年级的同学一共需要多少顶帐篷?5.章叔叔带了300元钱,到书店买了2套《故事大王》,每套36元,再用剩下的钱正好买了3套《科技丛书》,每套《科技丛书》多少元?6. 甲数是乙数的7倍,甲数比乙数多360,甲、乙两数的和是多少?。
江心岛小学五上周末练习6(小数除法2)班级 姓名一、填空1. 3.65÷0.24的商的最高位在( )位上。
2里填上适当的运算符号。
3.根据0.448÷1.6=0.28,填写出下面各数。
44.8÷1.6=( ) 448÷0.16=( ) 4.48÷0.016=( ) 0.448÷0.16=( ) 4.48÷160=( ) 44.8÷0.0016=( )4. 师傅5小时加工零件8个,师傅加工1个零件要( )小时,1小时能加工( )个零件。
5. 1.373737……是( )小数,它的的循环节是( ),用简便写法记作( )。
这个数保留两位小数是( )。
2.235235……的循环节是( )。
6. 5..85.6这个小数的小数点后面第20位上的数字是( );32.0.2.7这个小数的小数点后面第30位上的数字是( )。
7.已知1÷A=0..0.9 2÷A=0..1.8 3÷A=0..2.7 那么7÷A=( )8.把下面小数按从大到小排序。
6.4.2.4 6.424 6. .42.4 6.42.4 6..4( )>( ) >( ) >( )>( )二、计算72.8÷0.8= 30.6÷0.2= 99÷0.33= 4.8÷1.2÷0.4=1.5÷0.03= 50÷0.02= 8÷1.6= 7.2÷(4×0.09)= 0.35÷50= 0.75÷2.5= 50÷2.5×4= 5.7÷1.9+5.7÷0.1=2.列竖式计算,商是循环小数的,用简便方法表示。
36÷270 48÷7 1.027÷4.5 45.3÷11.12.73÷353.17÷0.6 15.6÷1.2 0.45÷3.240.04÷5.5 75.75÷0.75 369÷1.8 20.4÷6.3(得数保留三位小数)3.按规律在( )里填上合适的数。
高一化学必修一周末练习六(几种重要的金属化合物一)可能用到的相对原子质量:H-1 C-12 O-16 Na-23 Mg-24 Al-27 S-32 Cl-35.5 Fe-56 Ba-137一.单选题1.下列关于焰色反应的叙述正确的是 ( )A.五颜六色的焰火是物质本身燃烧的颜色B.氢气、硫等在氧气中燃烧时有颜色,这也是焰色反应C.某无色溶液进行焰色反应,透过蓝色钴玻璃可观察到火焰呈紫色,则可证明该溶液是钾盐溶液D.焰色反应是某种金属元素灼烧时所具有的特殊颜色,是物理变化2.既能与酸(H+)反应,又能与碱(OH-)反应的是:()①MgO ②Al ③NaHSO4 ④NaHCO3⑤CaCO3A、②④B、②③④C、②④D、②④③3. 下列关于碳酸钠和碳酸氢钠的比较中,正确的是()A .二者在水中的溶解度不同,碳酸氢钠的溶解度大于碳酸钠的溶解度B .二者热稳定性不同,碳酸氢钠的热稳定性大于碳酸钠的热稳定性C.等物质的量的碳酸钠和碳酸氢钠都能与盐酸反应放出二氧化碳气体,但产气量和反应快慢不同D .二者在一定的条件下可以相互转化4. 有关铝及其化合物的说法错误的是 ( )A.用于熔化烧碱的坩埚,可用Al2O3这种材料制成B.铝能在空气中稳定存在是因为其表面覆盖着一层氧化铝薄膜C.氧化铝是一种难熔物质,是一种较好的耐火材料D.氢氧化铝能中和胃酸,可用于制胃药5.下列各组离子中,在强碱性溶液中能共存,且在加入盐酸过程中会产生气体和沉淀的是()A. Na+、NO-3、AlO-2、SO2-4B. Na+、Al3+、NO-3、SO2-4C. K+、Cl-、AlO-2、CO2-3D. Na+、Mg2+、Cl-、HCO-36.将a g由CO和H2组成的混合气体在足量的O2中充分燃烧后,将生成的所有产物通过足量的Na2O2固体,Na2O2固体增加的质量为( )A. aB. 3a4g C.3a2g D.4a3g7.有甲、乙、丙三瓶等体积等物质的量浓度的NaOH溶液,若将甲蒸发掉一半水分,在乙中通入少量的CO2,丙不变,然后分别向甲、乙、丙三瓶中加入同浓度的盐酸,完全反应后所需盐酸溶液的体积是( )A .甲=丙>乙B .丙>乙>甲C .乙>甲=丙D .甲=乙=丙8.在V LAl 2(SO 4)3溶液中加入过量氨水,过滤得沉淀,然后在高温中灼烧沉淀最后得白色固体m g,溶液中SO -24的物质的量浓度是( )A .V m 27mol ·L -1 B .V m 272mol ·L -1 C .V m 543mol ·L -1 D .Vm 34mol ·L -19.在某无色溶液中缓慢地滴入NaOH 溶液直至过量,产生沉淀的质量与加入的NaOH 溶液体积的关系如图所示,由此确定,原溶液中含有的阳离子是( )A. H +、Mg 2+、Al 3+B. Mg 2+、Al 3+、Fe 2+C. H +、Ba 2+、Al 3+D. 只有Mg 2+、Al 3+10.有200mL 氯化镁和氯化铝的混合溶液,其中c (Mg 2+)为0.2mol ·L -1,c(Cl -)为1.3mol ·L -1。
班级 姓名 家长签名【基础训练】1、笔算。
470×35 750×240 450×6022、递等式计算。
(1)6020-103×12 (2)1008+204×20(3)16×102÷8 (4)114÷3×4503、解决问题。
(1)新华书店为庆祝“六一”儿童节,买 4套儿童百科送1套。
每套45元(2)星期天王华一家去郊游,去时用了3小时,返回时用了2小时。
(3)一所小学有男生250人, 。
这所学校共有学生多少人? ①女生人数是男生的2倍。
②男生人数是女生的2倍。
③女生人数比男生的2倍少100人。
(4)一列城际列车每小时行驶160千米,从甲地到乙地往返用了24小时。
甲乙两地相距多少千米?(5)杉杉童装厂计划四月份生产童装2500套,已经生产了15天,平均每天生产84套。
要想超额完成任务,后半月至少要生产多少套?【提高练习】1、一个矿泉水供应站每天分3次给各单位送矿泉水,每次送115瓶,今年的2月份,共送矿泉水多少瓶?2、一家大型商场,今年上半年的其中有3天的营业额分别是49万元、53万元、51万元。
这家商场今年全年的营业额约达多少万元?3、冬季时,服装店以350元的批发价进了100件羽绒服,以每件500元的价格卖出了50件;到了春季,羽绒服进行对折大甩卖,每件为250元,全部卖完。
你认为服装店是赚钱了还是亏损了?【拓展练习】□□□□ 6 □□□ 8× 2 5 ×□ 6 ×□ 71 2 4 0 1 5□□□□□□□□□□□ 2 □□□□□□□ 2 2 □ 0 4 2 0 0 6。
最新教学资料·苏教版数学七下数学周末练习6姓名:_________________一、选择题:1.计算(x -2y )2的结果是【 】A. x 2-2y 2 B. x 2-4y 2 C. x 2-4xy+4y 2 D. x 2-2xy+4y 2 2.计算()()b a b a --+33等于【 】A .2269b ab a -- B .2296a ab b --- C .229a b - D .229b a - 3.若22)21(+=++x b ax x ,则a 、b 的值应该是【 】A 、21,1==b aB 、a=b=1C 、41,1==b aD 、41,21==b a4.(-a+b)·P= a 2-b 2,则P 等于【 】A 、a -b B 、-a+b C 、-a -b D 、a+b 5.为了应用平方差公式计算()()c b a c b a -++-,必须先适当变形,下列各变形中,正确的是【 】 A.()[]()[]b c a b c a +--+ B.()[]()[]c b a c b a -++-C.()[]()[]a c b a c b +--+D.()[]()[]c b a c b a -+--6.下列各式的计算中,正确的有【 】① (a+2b)(a -2b)= a 2-2b 2 ② (x -3y)2=x 2-3xy+9y 2;③ (-3a -2b)2= -(3a+2b)2= -9a 2-12ab -4b 2: ④ (2a -3b)( -2a+3b)=4a 2-12ab+9b 2A、0个 B 、1个 C 、2个 D 、3个7.运用完全平方公式计算79.82的最佳选择的是【 】 A 、(79+0.8)2 B .(80-0.2)2 C .(70+9.8)2 D .(100-20.2)2 8.若()()1532-+=++kx x m x x ,则m k +的值为【 】A 、3-B 、5C 、2-D 、29.下列各题中,形如222b ab a +±的多项式有【 】① 41—2+x x ② 22—b ab a +③ 2244—b ab a + ④ 22410—25y xy x + ⑤ 1—412+y y ⑥ 1411612++m mA 、6个B 、5个C 、4个D 、3个10.若a 2+kab+9b 2是完全平方式,则k 的值为【 】A 、6 B 、-6 C 、6± D 、0 11.小聪计算一个二项整式的平方式时,得到正确结果4x 2+20xy+ ,但最后一项不慎被除污染了,这一项应是【 】 A 、5y 2 B 、10y 2 C 、25y 2 D 、100y 2 12.已知a 、b 满足等式x=4a 2+b 2+10,y=2(2a-3b),则x,y 的大小关系是【 】A 、x ≤yB 、x ≥yC 、x ≠yD 、 x=y 13.满足(2x-3)200<4300的x 的最大整数为 【 】A 、5 B 、6 C 、7 D 、814.若代数式x= -2a 2+4a-2,则不论a 取何值,一定有【 】A 、x>0B 、x<0 C 、x ≥0 D 、x ≤0 15. 如图,从边长为(a +4)cm 的正方形纸片中剪去一个边长为()1a +cm 的正方形(0)a >,剩余部分沿虚线又剪拼成一个矩形(不重叠无缝隙),则矩形的面积为【 】A .22(25)cm a a + B .2(315)cm a + C .2(69)cm a + D .2(615)cm a +16. 从边长为a 的大正方形纸板中挖去一个边长为b 的小正方形纸板后,将其裁成四个相同的等腰梯形(图①),然后拼成一个平行四边形(图②).那么通过计算两个图形阴影部分的面积,可以验证成立的公式是【 】A .a 2-b 2=(a -b)2B .(a +b)2=a 2+2ab +b 2C .(a -b)2=a 2-2ab +b 2D .a 2-b 2=(a +b)(a -b) 二、填空题:1.把下列各式配成完全平方式:(1) 25x 2+ +9y 2 = (5x -3y)2. (2) a 2+ +16b 2= ( )2(3) 16a 4+24a 2+ = ( )2 (4) ( )2-8p(m+n)+16p 2 =( )2 2.边长为m 的正方形边长减少了n (m >n) 以后,所得到较小正方形的面积比原正方形面积减小了 .3.若x -y=2 , x 2-y 2=16 , 则x+y=___________.4.若(5x +M )2=25x 2-10xy +N , 则M= ,N= . 5.已知a+b=5, ab=-6,则a 2+b 2= , ( a -b) 2= . 6.为确保信息安全,信息需要加密传输,发送方由明文→密文(加密),接收方由密文→ 明文(解密).已知加密规则为:明文a b c ,,对应的密文12439a b c +++,,.例如明文1,2,3对应的密文2,8,18.如果接收方收到密文7,18,15,则解密得到的明文为 7.若x 2-13x+1=0 ,则 , 。
四年级数学第二学期周末练习(6)班级姓名学号得分一、计算(45%)1、直接写出得数15%0.34÷100= 8÷10= 25.67×10= 0.12×10÷10= 0.8×100÷10=1.01×100= 1000×0.23= 5.123÷10= 7.15÷10×100= 20.6×10÷100=100×2.8= 0.06×10= 250÷1000= 10.3×100÷100= 9.62÷100×10= 2、递等式计算,能简便的要简便计算18%%1300×1320+1680×1300 148+3328÷64-75 345×150÷54600÷(25×23)(3600-1600)÷25×4 9000÷723、列式解答12%(1)最大的一位数与最小的两位小数的和,扩大100倍,结果是多少?(2)甲数是790,比乙数的100倍还多90,求乙数(3)522加上478的和除53乘12的积,结果是多少?二、概念(45%)1、把下列各数末尾添上0后,再按要求填数2%1.7 23 90 5.06 81.4 0.0047大小不变的有:;变大的有:。
2、添上小数点使排成的式子成立2%3078 > 604 > 7302 > 150283、在( )里填正确的数5%()× 10 = 2.51 ()÷100 = 148.3()÷ 10 = 4.03 100 ×()= 7.5()÷1000 = 0.034 ()÷100 = 45.21000×()= 5 ()×100 = 7.243.85×()= 385 0.56÷()= 0.05610.72÷()= 0.1072 8.5×()= 850023.05×()= 230.5 239.6÷()= 0.23964772÷()= 47.72 41×()= 41004、下面的数,去掉小数点后,大小有什么变化?2%0.7去掉小数点后是(),比原数()0.006去掉小数点后是(),比原数()0.506去掉小数点后是(),比原数()3.72去掉小数点后是(),比原数()5、下面的各数,小数点移到最高位数字的左边,小数大小有什么变化?2%3.5小数点移到最高位数字的左边是(),比原数()2.09小数点移到最高位数字的左边是(),比原数()600小数点移到最高位数字的左边是(),比原数()193.5小数点移到最高位数字的左边是(),比原数()6、填数5%83.0.65.7、单位换算7%2.1千米=()米 280米=()千米0.34米=()厘米 100.3厘米=()米1.056千克=( )克 670.1克=( )千克12.6千克=( )克 10.5元=( )角3.007升=( )毫升 256毫升=( )升0.617平方米=( )平方分米 92角=( )元6725平方厘米=( ) 平方米 2310毫升=( )升8、判断7%(1)3.84的小数点向左移两位,就原数乘以100。
2021-2021学年度第一学期五年级数学第六周周末作业班级:姓名:学号:一、填空题。
1 保留整数是(),保留两位小数是()。
2.÷,商的最高位在()位上,商比1要()。
3一个两位小数取近似值是,这个两位小数最小是(),最大是()。
4 2个一和4个十分之一合起来是()个十分之一。
5在商小于1的()里打“√”。
÷15 ()÷13 ()÷28 ()二、选择题。
(把正确答案的序号填入括号内)1下面的算式中,商大于1的是()。
A、÷8B、18÷24C、18÷122与×的乘积相等的算式是()。
A、×B、732×C、×453得数是的算式是()。
A、÷100B、×10C、÷4.÷的商()。
A、大于B、小于C、等于5 保留两位小数约是()。
A、 B、 C、三、用简便的方法计算。
×× 64×××99 ×99 ×××8四、用竖式计算下面各题。
×= ×= ×=验算÷8= 35÷2021 ÷6=÷= ÷34= ÷=验算五、应用题1为鼓励居民节约用水,自来水公司规定:每户每月用水 15 吨以内(含 15 吨)按每吨元收费,超过 15 吨的部分按每吨元收费。
( 1 )小云家上个月的用水量为 11 吨,应缴水费多少元?( 2 )小可家上个月的用水量为 17 吨,应缴水费多少元?请家长对学生作业完成情况进行评定(用“√”选择):学生作业完成的写字姿势:(①端正②一般③差)学生作业完成的态度:(①积极②拖拉③不愿做)学生作业完成的质量:(①非常好②良好③一般④差)家长签名:。
心尺引州丑巴孔市中潭学校第三2021年八年级英语下学期周末练习〔6〕〔〕牛一,单项选择〔20〕( )1. It is ________unlucky day today.I’ve lost ________ useful dictionary.A.a:a B.an,a C.a;an D.an,an( ) 2.-When ____ your grandma ____ you that dress last week? -Oh, I have forgotten.A. does; buyB. has; boughtC. had; boughtD. did; buy( ) 3. --Is Tom in the next room?--Well, it's hard to say. But I heard him _______ loudly when I passed by just now.A. speakB. to speakC. spokenD. speaking( ) 4. -How do you communicate with your foreign friends? -_______ writing emails, of course.A. WithB. ByC. AtD. From( ) 5. More than 20 people_______ in traffic accidents________ last May.A. have been dead; sinceB. died; forC. have died; forD. have been dead, for ( )6. I _______ the bike two years ago. I _______ it for two years.A. had; have boughtB. bought; have hadC. have; have hadD. bought; have bought ( )7. My sister has a pen pal(笔友).She is from _________.A.Canada B.Japanese C.English D.Australian( )8. - My brother's never been late for work, _______? - _______. He is a hard-working man.A. is he; Yes, he isB. isn't he; No, he isn'tC. has he; Yes, he hasD. has he; No, he hasn't( )9. We didn't_______ the hotel until 12 o'clock last night.A go B. arrive C. reach D. land( )10. Kitty spends a lot of time _____ after-school activities, but Linda spends little time_____ it.A. doing; inB. to do; inC. doing; onD. to do; on( )11. -How long has Robert_______? -Since 2004.A. been to BeijingB. become a policemanC. joined the art clubD. studied in this school( )12. Good to see you again. It's almost three years_______ we met last timeA until B. before C. while D. since( )13.—That must be a mistake.—No,it_________.I’ve done it many times.A.may not be B.needn’t be C.can’t be D.wouldn’t be( )14.一Don’t park here.Can’t you see the sign? 一 Sorry,I ________ it.A.haven’t seen B.didn’t see C.don’t see D.haven’t been seen ( )15.1 won’t go to see the film tonight,because I ________the ticket just now.A.1ost B.have lost C.1eft D.have left( )16.- Where ________you ________? - 1 went to see the football match.A.have;been B.have;gone C.are;going D.will;go( )17. She gives me a big smile_______ she sees me.A. from time to timeB. some timeC. every timeD. a first time( )18. We find _______ not easy _______ fifty English words in one day.A. that; to rememberB. it; to rememberC. that; rememberD. it; remember ( ) 19. –Excuse me. Could you tell me _______arrive at the museum? --Sorry, I am new here.A. how I couldB. how I canC. how to doD. what I can( )20. -Do you mind if I borrow your dictionary? -_______.A. Yes, you may borrowB. No, you canC. No, help yourselfD. No, I'm using it now二、完形填空 (10)Where did you go yesterday? Did you hear music at any of those places? Today most shops and restaurants play music.Scientists believe that music ___1__ people’s behavior(举止). According to some scientists, the sound of western classical(古典的) music makes people ___2__ richer. When a restaurant plays classical music, people spend ___3__ money on food and drinks. When the restaurant plays modern music, people spend less money. With ___4_ music, people spend even less.Scientists also _5___ that loud, fast music makes people eat faster. In fact, people __6__ their food faster when the music gets faster. Some restaurants play fast music during their __7___ hours. This gets people to eat faster and leave quickly. Restaurants __8__ make people spend even less.The __9__ time you hear music somewhere, be _10_. It might change the way you do things.( )1. A. changes B. makes C. tells D. takes( )2A. become B. get C. feel D. look( )3 A. much B. more C. little D. less( )4 .A. no B. much C. any D. some( )5. A. know B. hope C. realize D. believe( )6.A. cook B. order C. eat D. make( )7 A. free B. busy C. happy D. sad( )8 A. can B. should C. can’t D. needn’t( )9 A. first B. second C. next D. last( )10A. quiet B. quick C. happy D. careful三、阅读理解〔20〕AAccording to a new survey, students’ safety has become a big problem. Nearly 50% of students say they are worried about robbery (抢劫) on the way to and from school. Now in main big cities in China, some schools have taught students an unusual lesson: self-protection. Students like this lesson because there are no exams or boring classes. And they can learn how to save lives and know how to stop danger before it really happens.Chen Haoyu, a teacher at Beijing No.25 Middle School, gives young students advice on how to deal with danger.If you are robbed. Keep calm. If you cannot cry for help or run away, give the robber your money. Try to remember what the robber looks like and tell the police later.If you are in a traffic accidentIf a car hits you, you should remember the car number. If it is a bicycle, try to call your parents before you let the rider go. This is because you don’t know how seriously you are hurt. If it is raining hard and there is lightning. Don’t stay in high places and stay away from trees.When there is a fire . Get away as fast as you can. Put wet things on your body and try to find an exit. Do not use the lift.If someone is drowning(溺水). If you can’t swim, don’t get into the water. Cry out for help.Remember that danger is never as far away as you think. Take care of yourself at all times! ( )1. Why do students like the self-protection lesson?①Because there are no tests. ②Because the lesson is boring.③Because they can learn how to save lives.④Because they can learn to know how to stop danger before it happens.A. ①②B. ②③C. ①②④D. ①③④( )2. What will you do if a bicycle hurts you?A. I will remember the bicycle number.B. I won’t let the rider go until I call my parents.C. I will let the rider go before I call my parents.D. I will let the rider go because I know how seriously I am hurt.( )3. If your house is on fire, you must ________________.A. put dry things on your bodyB. run quickly and take the liftC. run away and find an exit as quickly as you canD. take everything you have and then run away( ) 4. There are ___________ ways of self-protection mentioned in the passage.A. 3B. 7C. 5D. 6( ) 5.The best title for this passage is ____________________.A. How to keep calmB. Self-protectionC. An usual lessonD. DangerBSome people think only school children do not agree with their parents, however, it is not true. Communication is a problem for parents and children of all ages. If it’s hard for you to communicate with your parents, don’t worry about it. Here are some advice for you to bridge thegeneration gap (消除代沟). Don’t argue (争辩) with your parents. Don’t get to your parents when you are angry. Your parents probably won’t consider your ideas if you are shouting at them. And you can’t express yourself well if you are angry. Go to someplace to cool off. Make sure you understand why you are unhappy. Then think about what you want to say to your parents. If you don’t think you can speak to them at the moment, try writing a letter.Try to reach a compromise (和解). Perhaps you and your parents disagree on something. You can keep your disagreement and try your best to accept each other. Michael’s mother didn’t agree with him about buying a motorcycle. They argued over it. But they finally came to a compromise. Michael bought the motorcycle, but only drove it on certain days.Of course, your parents might refuse to compromise on something. In these situations, it is especially important to show love and respect (尊敬) to them. Showing respect will keep your relationship strong.Talk about your values. The values of your parents are probably different from those of your own. Tell your parents what you care about, and why. Understanding your values might help them see your purposes in life.A good relationship with your parents can make you a better and happier person. It is worth having a try!( ) 6. The passage tells us _______ have a communication problem.A. parents and other peopleB. school kids and their parentsC. teachers and their studentsD. parents and children of all ages( )7 Your parents probably won’t consider your ideas if you _______.A. don’t get to them oftenB. write a letter to themC. don’t speak to them politelyD. express yourself well( )8. The underlined phrase “cool off〞 in the passage means “_______〞.A. to make yourself happyB. to get you quiet and relaxedC. to have a good restD. to hide yourself quickly( )9. If there’s really a generation gap between you and your parents, you’d better _______.A. have a talk with them oftenB. keep away from themC. agree with them all the timeD. know about their values( )10. From the passage we learn that _______.A. parents and children should not have a generation gapB. parents should show love and respect to their childrenC. there are some good ways to bridge the generation gapD. there are so many serious problems in families today四、单词〔20〕1. I have some problems with my English, could you give me some _____________(建议).2. As a student, we shouldn’t do something _____________(违反) the law.3. Tom has _____________(自信) in himself to do all the things well.4. As we all know, _____________(知识) is power.5. The day before yesterday I_____________(归还) the books to the library.6.The seasons in Australia are the ____________(对立、相反) of ours in China.7.WHO is an________ (国际的) organization.8. This computer costs about 800______________(美元) .9. Qingdao has beautiful ______________(海岸).10. The UK is an old ______________(欧洲的) country.B. 用所给单词的适当形式填空。
20151106六年级数学周末练习卷6
1、修—条公路,甲队单独修要15天,乙队单独修要20天,两队合修3天,共修了这条公路的几分之几?
2、如果工程队修一条长300米的路,第一天修了全长的1
4
,第二天修了余下的
2
5
,第三
天修完,那么第三天修了多少米?
3、一项工程,甲单独做10天完成,乙单独做12天完成,丙单独做15天完成,现在由甲、丙先合作2天,余下的工程再由乙单独完成,(1)乙需要多少天完成余下的工程,(2)完成这项工程前后共用多少天?
4、鹅的孵化期是30天,鸭的孵化期是鹅的14
15
,鸡的孵化期是鸭的
3
4
,问鸡
的孵化期是多少天?
5、一个饲养小组养了一些白兔和灰兔,其中灰兔有120只,白兔比灰兔的5
6
少10只,
这个小组一共养了多少只兔子?
6、如图是某园林的规划图,其中正方形的1
5
是水池,圆的
6
7
是竹林,竹林比草地多占
450平方米,草地占地多少平方米?
7、星期天,小明和小华到市图书馆查阅资料,他们早上8点20分出发,在路上看到了一位盲人老爷爷,两人就把老爷爷送回了家,到图书馆后一看表,正
好耽误了11分钟,比他们预计到达的时间晚了1
4
,小明和小华到图书馆用了
多少时间?他们在图书馆查阅资料的时间刚好是来时所用时间的
2
2
5
倍,小明
和小华是在几点钟离开图书馆的?。
初二数学周末练习6(菱形的性质与判定)基础性测试题1.下列条件中,能判断四边形是菱形的是()A.对角线相等B.对角线互相平分C.对角线互相垂直D.对角线互相垂直平分2.若菱形的两条对角线长分别是6和8.则它的周长为()A.5 B.10C.20D.403.如图所示,在菱形ABCD中,若∠ADC=120°,则BD:AC等于()A.B.C.D.4.如果菱形的周长为8.4cm,相邻两角之比为5:1,那么菱形的一组对边之间的距离为()A.4.2cm B.2.1cm C.1.05cm D.0.525cm5.给出下列命题:(1)平行四边形的对角线互相平分(2)对角线互相平分的四边形是平行四边形;(3)菱形的对角线互相垂直;(4)对角线互相垂直的四边形是菱形.其中,真命题的个数为()A.4个B.3个C.2个D.1个6.若菱形ABCD的对角线AC=6,BD=8.则菱形的高为________.7.菱形具有而平行四边形不一定具有的性质是________和________.8.菱形的一条对角线与一条边长相等,则这个菱形相邻两个内角的度数分别为________。
巩固性测试题9.下列说法中,正确的是()A.有一个角是60°的四边形是菱形B.有一组邻边相等的四边形是菱形C.有两边相等的平行四边形是菱形D.四条边相等的四边形是菱形10.若菱形的一条对角线长是另一条对角线的2倍,且此菱形的面积为S,则它的边长为()A.B.C.D.11.将菱形ABCD的边AD绕点A旋转60°后,恰好能与AB重合,则当菱形的周长为8时,该菱形的面积为()A.B.C.D.12.已知菱形的边长为6,一个内角为60°,则菱形较短的对角线的长是()A.B.C.3D.613.如图所示,已知ABCD是平行四边形,下列结论中,不一定正确的是()A.AB=CDB.AC=BDC.当AC⊥BD时,它是菱形D.当∠AOB=90°时,它是菱形14.如图所示,在菱形ABCD中,BE⊥AD,BF⊥CD,E、F是垂足.AE=ED,则∠EBF=()A.75°B.60°C.50°D.45°15.过四边形ABCD的各顶点作对角线BD、AC的平行线,围成四边形EFGH.若四边形EFGH是菱形,则原四边形ABCD一定是()A.菱形B.平行四边形C.矩形D.对角线相等的四边形16.同学们玩过万花筒,它是由三块等宽等长的玻璃片围成的.如图是看到的万花筒中的一个图案,图中所示的小三角形均是全等的等边三角形,其中菱形AEFG可以看成是把菱形ABCD以A为中心()A.顺时针旋转60°得到的B.顺时针旋转120°得到的C.逆时针旋转60°得到的D.逆时针旋转120°得到的17.已知一个菱形的面积为平方厘米,且两条对角线的比为,则菱形的边长为________。
禁j īn( ) j ìn()嚼 ju é( ) ji áo() 乐 l è( ) yu è()磨 m ó( ) m ò() 五年级下册第6周周末练习姓名 成绩一、看拼音写汉字。
(8分)xu àn r ǎn f ǔ m ō m íng m èi l í m ǐ ( ) ( ) ( ) ( )ān w èi su ō y ī f áng ài ch ī m í ( ) ( ) ( ) ( )二、多音字组词。
(8分)三、把下列词语补充完整。
(8分)____欲流 __ 美 __美 __心所___ ___如生精神____ 见___ 广 ___ 情同 张__李__四、判断,对的打“√”,错的打“×”。
(4分)1.《冬阳.童年.骆驼队》是小说《城南往事》的序言,作者高洪波。
( ) 2.《牧童》、《舟过安仁》和《清平乐.村居》都是描写儿童生活情趣的诗。
( ) 3.“浪里白条”是指江上会游泳的小朋友。
( ) 4.“清平乐”和“快乐”中的“乐”字读音一样。
( )五、选词填空。
(8分)愿意随意1.蝴蝶()地飞,一会儿从墙头上飞来一对黄蝴蝶花,一会儿从墙头上飞走一只白蝴蝶。
2.黄瓜()开一朵花,就开一朵花,()结一个瓜,就结一个瓜。
不但…….反而……. 不是……..而是……….3.我有时()没有盖上菜种,()把它踢飞了。
4.我也过来浇水,但()往菜上浇,()拿着水瓢,把水往天空一扬。
六、按要求改写句子。
(4分)1.雨下得很大。
夸张句:。
2.我看骆驼咀嚼。
扩句:。
七、按课文内容填空。
(1+1+2=14分)1.老师教给我,要学骆驼,沉得住房气。
看它从不着急,()总会到的;(),总会吃饱的。
2.白杨树从来就()。
哪儿需要它,它就在哪儿(),长出()。
不管遇到()还是(),不管遇到()还是(),它总是(),那么(),不(),也不()。
丹徒高级中学高三1~9班数学周末练习(6)班级__________姓名____________学号__________一、填空题1.已知全集{}1,2,3,4,5,6,7U =,{}2,4,5A =,则U C A = {}1,3,6,7 .2.已知向量(cos35,sin35),(cos65,sin65)a b =︒︒=︒︒,则向量a 与b 的夹角为 30︒ .3.公比为2的等比数列{}n a 的各项都是正数,且41016a a =,则10a = 32 . 4.经过点)1,2(-,且与直线0132=--y x 垂直的直线方程是 3240x y +-= 5.函数x x x y sin cos -=,(0,2)x π∈单调递增区间是 (,2)ππ .6.设,x y 满足241,22x y x y z x y x y +≥⎧⎪-≥-=+⎨⎪-≤⎩则的最小值是 2 .7.已知函数2sin coscos 22()2sin 2cos 12x x x f x x x =+-,则()8f π=8.已知曲线3()f x x =上点1)P(1,,则在点P 的切线方程为 320x y --= . 9.已知圆C 方程为224x y +=直线l 过点P(1,2),且与圆C 交于A 、B 两点,若|AB|=23,则直线l 的方程是_________3x -4y +5=0或x =1___________ .10.设a >0,b >0,4a +b =ab ,则在以(a ,b )为圆心,a +b 为半径的圆中,面积最小的圆的标准方程是______(x -3)2+(y -6)2=81_____ .二、解答题11、(本小题满分14分)ABC ∆中,3AC =,三个内角,,AB C 成等差数列.(1)若cos 3C =,求AB ;(2)求BA BC ⋅ 的最大值.解:(1)∵ ,,A B C 成等差数列,∴ 2B A C =+,又A B C π++=,∴ 3B π=, ·············································································· 2分又cos C =,∴sin C =, ·········································································· 4分 由正弦定理得:sin sin AB BCC A=,所以sin 2sin BC AB C A =⨯==; ······························································· 7分 (2)设角,,A B C 的对边为,,a b c ,由余弦定理得:2222cos b a c ac B =+-,即2223a c ac =+-, ································································································· 9分 又222a c ac +≥,当且仅当a c =时取到等号,所以229a c ac ac =+-≥ ·························································································· 11分所以1922BA BC ac ⋅=≤ ,所以BA BC ⋅ 的最大值是92. ··················································································· 14分12、在数列{}n a 中,前n 项和为n S .已知123,22a a == 且012311=++--+n n n S S S (*n N ∈, 且n 2≥).(1)求数列{}n a 的通项公式;(2)求数列{}n a n ⋅的前n 项和n T . 解:(1)221(*)n n a n N -=+∈(2)由n n a ⋅=n n n +⋅-22得 T n =)321(22322212101n n n ++++⨯+⨯+⨯+⨯--令 A n =2112232221--⨯+⨯+⨯+⨯n n则2 A n =122122)1(232212--⨯+⨯-+⨯+⨯+⨯n n n n∴A n =12322)2222(021--⨯++++-+-n n n =12221)21(221--⨯+----n n n =12)1(23-⋅++n n ∴T n =)321(22322212101n n n ++++⨯+⨯+⨯+⨯--=12)1(23-++n n +)1(21+n n*13、(本小题满分16分)如图:已知,A B 是圆224x y +=与x 轴的交点,P 为直线:4l x =上的动点,,PA PB 与圆224x y +=的另一个交点分别为,M N .(1) 若P 点坐标为(4,6),求直线MN 的方程;(2) 求证:直线MN 过定点.解(1)直线P A 方程为2y x =+ , 由2224y x x y =+⎧⎨+=⎩解得(0,2)M ,………2分 直线PB 的方程36y x =- ,由22364y x x y =-⎧⎨+=⎩解得86(,)55N -,………4分 所以MN 的方程22y x =-+………6分(2)法一:设(4,)p t ,则直线P A 的方程为(2)6t y x =+,直线PB 的方程为(2)2ty x =-224(2)6x y t y x ⎧+=⎪⎨=+⎪⎩得22272224(,)3636t t M t t -++,同理222288(,)44t t N t t --++………10分 直线MN 的斜率222222224883647222812364t tt t t k t t t t t --++==----++……………12分 直线MN 的方程为22228288()1244t t ty x t t t -=---++,化简得:22881212t t y x t t=---……………14分 所以直线MN 过定点(1,0)…………………16分 注:其他解法酌情对应给出相应的分数. 法二:设01122(4,),(,),(,)P y M x y N x y ,003326BP AP y y k k ==⋅=,即1212322y yx x =+-, 两边平方得:221222129(4)4(2)(2)x x x x --=+-,整理得12129(2)222x x x x -+=+- 即121225()80x x x x -++=……(1),设MN 的方程为()y k x m =-,代入2240x y +-=中得22222(1)240k x k mx k m +-+-=,得22212122224,11k m k m x x x x k k -+==++代入(1)式得 222228108011k m k m k k--+=++,即22(54)0k m m -+=.当0k ≠,1m =,或4m =(舍) 当0k =时,直线MN 即为直线AB ,所以直线MN 过定点(1,0).三、附加题B .选修4—2 矩阵与变换已知矩阵⎥⎦⎤⎢⎣⎡=41b a A ,若矩阵A 属于特征值1的一个特征向量为α1=⎥⎦⎤⎢⎣⎡-13,5的一个特征向量为α2=⎥⎦⎤⎢⎣⎡11.求矩阵A ,并写出A 的逆矩阵.解:由矩阵A 属于特征值1的一个特征向量为α1=⎥⎦⎤⎢⎣⎡-13可得,⎥⎦⎤⎢⎣⎡41b a⎥⎦⎤⎢⎣⎡-13=⎥⎦⎤⎢⎣⎡-13, 即33=-b a ; 3分由矩阵A 属于特征值5的一个特征向量为α2=⎣⎢⎡⎦⎥⎤11,可得⎥⎦⎤⎢⎣⎡41b a ⎥⎦⎤⎢⎣⎡11=5⎥⎦⎤⎢⎣⎡11, 即5=+b a , 6分解得⎩⎨⎧==32b a 即A =⎥⎦⎤⎢⎣⎡4312, 7分 A 的逆矩阵是⎥⎥⎥⎦⎤-⎢⎢⎢⎣⎡-52535154 10分C .选修4—4 参数方程与极坐标在极坐标系() (02π)ρθθ<≤,中,求曲线2sin ρθ=与cos 1ρθ=的交点Q 的极坐标.解:以极点为坐标原点,极轴为x 轴的正半轴建立直角坐标系则曲线2sin ρθ=可化为:()x y +-=2211曲线cos 1ρθ=化为x=1, ………………6分由()x yx⎧+-=⎨=⎩22111可得交点坐标(1,1),所以交点Q的极坐标是)π4………………10分。
四年级奥数周末练习六 11、 在一道减法算式中,被减数比减数多1998,差比减数小56,被减数是( )。
2、 被减数、减数、差之和为80,减数与差相等,减数是( )。
3、 在一道减法算式里,被减数、减数与差的和等于120,而差是减数的3倍,那么减数是( )。
4、 一个数除以4,李林在计算时把除号看成了减号,得到的结果是28。
正确的商是( )。
5、 一个数加14,小红在计算时把加号当成了乘号,得到的结果是266,正确的结果是( )。
6、 一个数乘以6再除以5,亮亮在计算时错误地看成除以6再乘以5,结果得数是75,正确的结果应是( )。
7、 两数相乘,若乘数增加14,乘数不变,积增加168,若乘数增加14,被乘数不变,积增加420.那么原来的积是( )。
8、 一个学生做两位数乘两位数乘法时,把一个因数的个位数5误写成3,得到的乘积是516,正确的乘积是540,这两个乘数是( )。
9、 两个数相乘,如果被乘数增加2,乘数不变,积就增加36,如果乘数减少5,被乘数不变,积就减少120,原来的积是( )。
10、乘数是6,被乘数比乘积小140,这个乘法算式是( )。
11、乘数是9,积比被乘数多720,被乘数是( )。
12、一道乘法算式中,乘数是9,把乘数、被乘数和乘得的积相加得319,被乘数是( )。
13、 张妮在计算有余数的除法时,把被除数115当成151,结果商比正确得数大了3,但余数恰好相同,这道除法算式是( )。
14、 刘英在计算有余数的除法时,把被除数113错写成131,结果商比原来多3,但余数恰巧相同,那么该题的余数是( )。
15、 欢欢和莉莉计算从不出差错。
有一天两人同时用同一个数做被除数,欢欢的除数是12,莉莉的除数是15;结果欢欢除得的商是32还余6,莉莉的计算结果是( )。
16、计算下面图形中角的度数。
1、已知∠1=75°,∠2=∠3=∠4=2、∠1= ∠2= ∠3= 35° 2 30° 3 1。
苏教版六年级数学第6周周末练习一、填空。
(每空1分,共35分)1、56 ×6表示( ),还可以表示( );13 ×34 表示( )。
2、小刚每分钟行50米,小李每分钟行的是小刚的45,小李每分钟行多少米?想:根据“小李每分钟行的是小刚的45 ,把 看作单位“1”,求小李每分钟行多少米,就是求 的 是多少? 3、李大伯家养鸡60只,养的鸭比鸡少16,鸭比鸡少多少只?想:根据“养的鸭比鸡少16 ”。
把 看作单位“1”, 是 的16 ,求鸭比鸡少多少只,就是求 的 是多少。
4、若把甲仓粮食的51调入乙仓,则 甲、乙两仓存量相等。
原来甲仓存粮是乙仓的( )。
5、43×( )=71×( )=76+( )=58-( )=0.375×( )=187×( )6、12个97米是( );0.48吨的65是( )。
107×[]9>107,[]里最大填( )。
1的倒数是( ), ( )没有倒数。
7、已知a ×373 =1112 ×b=1515 ×c ,并且a 、b 、c 都不等于0,把a 、b 、c 这三个数按从小到大的顺序排列, 。
8、已知两个不同的质数,它们的倒数之和的分子是12,那么分母是( )。
9、两个不同自然数的倒数和为127,这两个自然数可以是( )和( )。
10、两个真分数的积一定比这两个数中的任意一个都( )。
(填“大”或“小”)11、甲班人数是乙班的52,乙班人数是丙班的73,甲班人数是丙班的( )( ) ,如果丙班有70人,那么甲班有( )人,乙班有( )人。
12、如图,A 、B 是长方形长和宽的中点,阴影部分面积 是长方形面积的( )。
13、某省将一批奖金奖给在奥运会上表现突出的优秀运动员,分为一个一等奖,两个二等奖,三个三等奖。
一等奖的奖金是30万元,两个二等奖的奖金比一个一等奖多31,每个三等奖的奖金是每个二等奖的53,这批奖金共有( )万元。
初二周末练习6(等腰三角形(二))周末练习(一)选择题(每小题5分,共40分)1.下列图形中,不是轴对称图形的是().A.角B.等边三角形C.线段D.不等边三角形2.两个图形关于某直线对称,对称点一定在().A.这直线的两旁B.这直线的同旁C.这直线上D.这直线两旁或这直线上3.如图是奥运会会旗上的五球圆形,它有()条对称轴.A.1 B.2C.3D.4第3题图第4题图4.如图,在△AB C中,∠B、∠C的平分线相交于F,过F作DE∥BC,交AB于D,交AC于E,那么下列结论中:①△BDF,△CEF都是等腰三角形;②DE=DB+CE;③AD+DE+AE=AB+AC;④BF=CF;正确的有()A.1个B.2个C.3个D.4个5.下列说法中错误的是().A.两个轴对称的图形对应点连线的垂直平分线就是它们的对称轴B.关于某直线对称的两个图形全等C.面积相等的两个三角形对称D.轴对称指的是两个图形沿着某一直线对折后重合6.下列说法正确的是().A.圆的直径是对称轴B.角的平分线是对称轴C.角的平分线所在直线是对称轴D.长方形只有4条对称轴7.如图,BC=BD,AD=AE,DE=CE,∠A=36°,则∠B=().A.45°B.36°C.72°D.30°第7题图第8题图8.在平面镜里看到背后墙上,电子钟示数如图示,这时的时间应是().A.21:05 B.21:15 C.20:15 D.20:05(二)填空题(每小题5分,共30分)9.△ABC中,AD⊥BC于D,且BD=CD,若AB=3,则AC=__________.10.等腰三角形的一个角为100°,则它的两底角为__________.11.△ABC中,∠A=40°,∠B=70°,则△ABC为__________三角形.12.在△ABC中,AB=AC,若=30°则∠A=__________,∠B=__________.13.在等腰三角形中,一个内角为30°,则另外两个内角为__________.14.如图,△ABC中,BC边的垂直平分线DE交BC于D,交AC于E,BE=5厘米,△BCE的周长是18厘米,则BC的长为__________.(三)解答题(共30分,15题6分,16—18题每题8分)15.已知∠AOB,试在∠AOB内确定一点P,如图,使P到OA、OB的距离相等,并且到M、N两点的距离也相等.尺规作图,保留作图痕迹,写出作法.作法:16.如图,,,,M为CD的中点.求证:.17.一个等腰三角形一腰上的高与另一腰的夹角为45°,求该三角形顶角的度数.18.如图,△ABC中,∠C=90°,D是AB上一点,且AC=AD,请问∠A与∠DCB具有怎样的关系?并说明理由.参考答案(一)选择题1.D 2.D 3.A 4.C 5.C 6.C 7.B 8.A(二)填空题9.3;10.40°,40°;11.等腰12.80°,50°13.75°,75°或120°,30°14.8cm(三)解答题15.作法:作∠AOB的平分线OC作MN的垂直平分线DEDE与OC相交于点P点P即为所求作的。
初中英语学习材料madeofjingetieji初二英语周末练习6一、单项填空(15%)( ) 1. All the students agreed to go to Qingdao by _______ sea and camp by _______ sea.A. the; aB. / theC. /; /D. a; the( ) 2. Do you know how long the meeting has _______?A. lastedB. heldC. overD. begun( ) 3. Now mobile phones are not so expensive as they _______ to be.A. useB. usedC. are usedD. were used( ) 4. What was the boy searching ________?A. for the InternetB. the information for the InternetC. for on the InternetD. Internet( ) 5. —Why are you looking for Mary in a hurry, John?—The boss is wondering where she _______ and how long she _______ there.A. has been; has beenB. has gone; has goneC. has been; has goneD. has gone; has been( ) 6. You _______ to the meeting this afternoon if you have something important to do.A. needn’t to come B don’t need come C. don’t need coming D. needn’t come ( ) 7. The husband and wife have strange habits. He’d like to sleep with lamp _______ at night and his wife the window _______.A. burning; wide openB. burnt; widely openedC. burnt; wide openD. burning; widelyopen( ) 8. —What’s the weather like here this summer?—There _______ very little rain.A. areB. hasC. has beenD. have been( ) 9. Could you tell me how many places of interest you ________ so far?A. visited toB. have beenC. have traveled toD. have gone to( ) 10..一Dad, can I go to the movies tonight?一Sure, but you come back home before 9 o'clock.A can B. must C may D. might( ) 11. We don't know it next. Let's go and ask Mr. Li.A. what to doB. to do whatC. whether to doD. to do whether( ) 12. We can't work out the physics problem. Can you tell us ?A. how to doB. what to do itC. how to do itD. what should to do( ) 13. 一Can you come to have dinner with me this evening?一I'm afraid not. I take care of my grandmother. She is ill.A. can'tB. have toC. mayD. could( ) 14. 一Don't give up, my children. Keep and you will be successful.一Thank you, Mr. Wang. We'll try our best.A. working onB. working offC. for workingD. to work( ) 15. 一Lucy, let me help you fix your computer.一. I can manage it myself.A. That's UKB. No, thanksC. Perhaps notD. Not at all二、完形填空(10%)Mr and Mrs Green were very worried about their son, Daniel. He was born normal (正常) in every other way, 1 seemed to be dumb (哑的). Mr and Mrs Green tried everything to get him to 2 , but with no success.When Daniel was six years old, the best doctors in the town examined (检查) him 3 , but could find nothing wrong. And he seemed to be smart. It was just that he 4 spoke.“There might be something wrong with his 5 , and he doesn’t know he’s able to speak,”one doctor said.“But he can read and write,”said Mr Green, “We’ve written him notes, telling him to speak some day.”“It’s certainly very 6 ,” another doctor said. “Perhaps he will be able to speak some day.”7 passed. Daniel went to university. But he didn’t speak a single word.Then one day Daniel was having a meal with his parents. Without any warning, he looked up from his 8 and said, “Pass me the salt, please.”Mr and Mrs Green were excited. “You spoke! You spoke!” they cried. “Why have you 9 so long to speak?”“I didn’t have anything to say,” he said. “Until now everything was 10 . But you forgot to put salt in these potatoes.”( ) 1. A. because B. when C. but D. before( ) 2. A. speak B. walk C. play D. laugh( ) 3. A. angrily B. slowly C. carefully D. quickly( ) 4. A. never B. often C. usually D. always( ) 5. A. back B. hair C. face D. mind( ) 6. A. exciting B. strange C. noisy D. quiet( ) 7. A. Hours B. Weeks C. Months D. Years( ) 8. A. chair B. meal C. hands D. books( ) 9. A. slept B. walked C. missed D. waited( ) 10. A. wrong B. easy C. perfect D. new三、阅读理解(30%)(A)When you are about to do something brave, a cheerful wish of “Good luck!” from a friend can be helpful. But if you think you need lots of luck, what else might you do?In the UK and US there are some strange traditions for bringing yourself a little more good luck. Some are hundreds of years old and some are much newer.Have you heard the saying “When you wish upon a star”? If you are looking up at the sky on a clear night and you see a sudden flash of light, it is probably a shooting star! Seeing one doesn’t happen very often. The saying goes that if you see one you have been very lucky, and so if you make a wish, it will come true.Maybe you have heard of the lucky rabbit’s foot. Some people believe that rabbits are lucky animals, so they carry a part of the rabbit, its foot, for good luck. There are all kinds of strange, unclear rules aboutwhic h of the rabbit’s feet is the luckiest. It is said that this good luck tradition is the oldest one of all. However, as the funny saying goes, “Depend on the rabbit’s foot if you will, but remember it didn’t work for the rabbit!”People in Britain love trees. If it is autumn and leaves are falling from the trees, some people try to catch the leaves as they fall because they think each leaf they catch will bring them a lucky month in the following year—they will need to catch 12 falling leaves to have a whole year of good luck!( ) 1. ______ is mentioned (提到) in the oldest good luck tradition.A. A rabbit’s footB. A falling leafC. A cheerful wish from friendsD. A shooting star( ) 2. From Paragraph 3, we know that _______.A. we can often see shooting starsB. people can see a shooting star on a rainy nightC. your wish may come true if you see a shooting starD. people believe that it’s unlucky to see a shooting star( ) 3. The British try to catch 12 falling leaves because _______.A. the leaves fall in autumnB. there are so many leaves to catchC. the leaves can bring them a lucky monthD. they want to have a whole year of good luck ( ) 4. In Paragraph 5, the underlined word “them”refers to ______.A. treesB. peopleC. leavesD. years( ) 5. The passage is mainly about ______.A. how to wish upon a starB. things that bring good luckC. British people love leavesD. which of the rabbit’s feet is the luckiest(B)One afternoon I visited an art museum while waiting for my husband to finish a business meeting. I was looking forward to a quiet view of the art works.A young couple viewing the paintings ahead of me chatted nonstop (不停) between themselves. I watched them a moment and found the wife was doing all the talk. I admired (赞赏) the husband for putting up with her continuous (持续的) talk. Distracted (分心) by their noise, I moved on.I met with them many times as I moved through the different rooms of art. Each time I heard her continuous talk, I moved away quickly.I was standing at the counter (柜台) of the museum gift shop when the couple came near to the exit. Before they left, the man reached into his pocket and pulled out a white thing. He extended (展开) it into a long stick and then tapped (敲打) his way into the coatroom to get his wife’s jacket.“He’s a brave man.” The salesman at the counter said, “Most of us would give up (放弃) if we were blind (瞎的) at such a young age. But he said his life wouldn’t change during his recovery (恢复). So, as before, he and his wife come in when there’s a new art show.”“But how does he enjoy the art?” I asked, “He can’t see.”“Can’t see?You’re wrong. He sees a lot. More than you or I do.” The clerk said, “His wife describes each painting so he can see it in his head.”I learned something from the couple that day. I saw a young wife describing paintings to a person without sight (视力) and a husband who would not allow blindness to change his life. And I saw the love shared by two people as I watched this couple walk away hand in hand.( ) 6. The young couple was at an art museum ________.A. to show their loveB. to enjoy artC. to discuss paintingsD. to describe paintings( ) 7. “…I moved away quickly.” in Paragraph 3 shows that the writer _______.A. was in the hope of visiting more roomsB. was in a hurry to buy some giftsC. was tired of the nonstop talkingD. was not interested in the art show( ) 8. We can infer (推断) from the passage that the husband _______.A. was not born blindB. couldn’t stand (忍受) his wifeC. knew nothing about artD. completely depended on (完全依靠) his wife ( ) 9. After hearing what the clerk said about the couple, the writer was _______.A. braveB. excitedC. touchedD. angry( ) 10. The passage is mainly about _______.A. the importance of artB. good manners in publicC. love of a husbandD. love between a couple(C)New York is the biggest city of the USA. A long time ago, it was called Lenapehoking. In 1626, Dutch(荷兰) people bought the land for only $24! They called it New Amsterdam. Then in 1664, the British took it over and changed the name to New York.New York had an excellent harbour(港口). Many people from all over the world came by sea and landed in New York. These people wanted a better life. New York seemed to give them that. By 1835, New York became the largest city in the United States. New York City used to have five smaller towns but now they are all part of the same city. They are Manhattan, Brooklyn, Queens, the Bronx and Staten Island.Today, New York is home to millions of people from all over the world. These different cultures make New York an exciting place to visit. There’s much to do in New York. You can take a helicopter(直升飞机) riding through the city, ride horses in Central Park, see a movie in the afternoon and watch the sunset(日落) over the Brooklyn Bridge. Don’t worry if you get hungry. Some restaurants are open 24 hours a day!( )1. In the year 1626, New York was called _______________.A. LenapehokingB. New AmsterdamC. New YorkD. Manhattan( )2. A long time ago, many people came to New York _______________.A. by trainB. because it was beautifulC. to look for a better lifeD. to travel( )3. New York became the largest city in the United States _______________.A. about three hundred years agoB. about two hundred years agoC. about four hundred years agoD. one hundred years ago( )4. The writer suggests(建议) that the tourists watch the sunset in __________.A. BrooklynB. QueensC. the BronxD. Staten Island( )5. Which of the following is NOT TRUE about New York?A. The city got the name “New York” in 1664.B. New York is a big and exciting city.C. New York has five smaller towns now.D. If you are hungry at 3 a.m., you can go to a restaurant.五、根据句意和汉语注释,写出单词的正确形式(15%)1. My mother felt very happy after _______________ (收到) my present.2. The more you experience, the more_______(know)you will get.3. There is a tall tree_______(在……对面)the small house.4. Are there any _______________ (国际的) banks in this modern town?5. Jim, you look very tired. How about _______________ (放松) for a while?6. Can you see the goldfish swimming at the _______________ (底部) of the tank?7. _______________ (澳大利亚的) English is different from British English.8. My teacher often gives me some_______(建议)on how to learn English9. “Useless” is the _______________ (对立的物) of “Useful”.10. Take a look at the bread. I think it has been bitten. I guess there are _______________ (mouse) in thekitchen.11. The children were afraid of _______________ (dark). They screamed and cried in the dark hole.12. Take a look at the bread. I think it has been bitten. I guess there are _______________ (mouse) in thekitchen.13. The children were afraid of _______________ (dark). They screamed and cried in the dark hole.14.Eating too much cold food is bad for our_______(胃)15. There are five_______(手指)on each hand.七、任务型阅读(10%)K.L. Rothey, 71, from the United States, a retired lawyer (退休律师)Rothey has given himself the Chinese name of Luqi or “roadside beggar (乞丐)”. In his eyes, beggars are doing important work—collecting rubbish. What they do is not dirty.Rothey first visited China in 1984 and soon he became interested in Chinese culture. Married to a Chinese woman, he lived in Huangshi.Many people know him because he often shows up in the street collecting rubbish. “Huangshi is my home so I hope it becomes cleaner and more beautiful,” says Rothey. He has also organized volunteers to collect rubbish in other cities, including Wuhan.Jill Robinson, 50, from Britain, founder (创立者) and CEO of Animals Asia Foundation.She has been working for nearly 20 years to stop people from getting the bile (胆汁) from moon bears.She began working for the International Fund for Animal Welfare in Hong Kong in the mid-1980s. A business trip to a bear farm in 1993 changed her life. She saw so many moon bears killed by people. She said she would be back to set them free.In 1998, she set up the Animal Foundation. In July 2000, the foundation agreed to free 500 farmed moon bears. In 2002, the Moon Bear Rescue (救援) Center was set up in Chengdu.“As much as we save them, they save us. These bears save us every day and they teach us to be better people,” Robinson says.Name K.L.Rothey Jill Robinson Nationality (国籍) (1) BritainAge 71 Years old 50 years oldEvents •He first visited China in 1984and became interested in Chineseculture.•He often (2)rubbish in the street in Huangshi.•He has also organizedvolunteers to collect rubbish in othercities.•She began working for theinternational Found for AnimalWelfare in the mid-1980s.• A (3) trip to a bearfarm changed her life in 1993.•In (4) , the MoonBear Rescue Center was set up inChengdu.The two passages are about two foreigners who have helped to (5) Chinese lives withtheir contributions (贡献). We should learn from them.八、完成句子(10%)1.当我最终感受到我脚下陆地时,我精疲力竭。
四年级下册数学周末练习卷(第6周)学校 班级 姓名 号数一、口算。
5.24×10= 2.56×10= 0.458×1000= 0.07×100= 0.2÷100= 7.05÷10= 4÷100= 34.2÷1000= 0.96×10÷100= 7.01×10=2、脱式计算,怎样算简便就怎样算。
2000-2000÷25+188 780×[192-(6+86)] 27×36+27×65-27 35×101二、我会填。
1、小数点左边第二位是( )位,它的计数单位是( ),第四位是( )位,它的计数单位是( )。
小数点右边第一位是( )位,它的计数单位是( ),第三位的计数单位是( )。
2、小数60.08是( )位小数,读作( ),它是由6个( )和8个( )组成的。
3、3个十,5个1,1个 和8个0.001组成的小数是( )。
4、8.02里有( )个0.01。
0.256里有( )个 。
5、把245000改写成用“万”作单位的数是( );省略万位后面的尾数是( );把758000000元改写成以“亿元”为单位的数是( ),保留一位小数是( )。
6、在○里填上“>”、“<”或“=”。
0.18○0.179 0.50○0.5 6.8公顷○6公顷8平方米 0.1○0.0999 4.954○4.96 108厘米○10.1分米7、8.25在两个相邻的一位小数( )和( )之间。
8、大于8而小于9的一位小数有( )个。
9、小数点向右移动一位,原数就( ),向左移两位,原数就( )。
10、把2.7扩大( )倍是270,把0.36缩小为原数的 是( )。
11、一次短跑比赛中的成绩如下:小明8.40 秒,小军8.37秒,小东8.04秒,小强8.34秒,请把他们的成绩按名次从高到低排列:100110001101三、我来当法官。
五年级数学周末练习(6)一、仔细推敲。
1.学校图书馆有文艺书m本,科技书比文艺书少240本。
科技书有()本。
2.晶晶买了2枝钢笔和2枝圆珠笔,小敏买了32枝圆珠笔。
两人用去的钱一样多,一枝钢笔的价钱等于()枝圆珠笔的价钱。
3.甲仓库的粮食是乙仓库的3倍,若从甲仓库运出18.5吨,放入乙仓库,则甲、乙两仓库的存粮正好相等,原来甲仓库存粮()吨,乙仓库存粮()吨。
4.有七个连续的偶数,它们的和是280,这七个连续的偶数中,最大的那个偶数是()。
5.儿子今年9岁,父亲今年37岁,()年后父亲的年龄是儿子的年龄的3倍。
6.18的因数有(),60的因数有(),18和60的公因数有(),最大公因数是()。
7.如果A=2×3×7,B=2×5×7,那么A和B的最大公因数是(),最小公倍数是()。
8.用0、3、5、7四个数组成一个同时是2和5的倍数的四位数,最大是(),最小是()。
9.要使601□既是2的倍数,又是3的倍数,那么□里可以填()。
10。
a与b的最大公因数是6,最小公倍数是72,a、 b是()和()或()和()。
二、对号入座。
1.在2.9+X=4.1,74—18=56,24+a<47,8X=12.8,m—4.8>12.5,20.5n,X÷4=24中等式有(),方程有()。
A、2个B、3个C、4个2.果园里有苹果树360棵,是梨树的1.5倍,求梨树有多少棵?设有梨树X棵,则下列方错误的是()。
A、1.5X=360B、360÷X=1.5C、X÷1.5=3603.若X+1.5×3=7.2,则X+X等于()。
A、2.7B、5.4C、1.354.甲袋有m ㎏大米,乙袋有n ㎏大米。
若从甲袋倒12㎏放入乙袋,则两袋大米一样重,下面等式中不符合题意的是()。
A、m—n=12B、m—12=n+12C、m—n=12×25.1、2、4、8是8的()A、因数B、公因数C、素数6.12是()的最大公因数。
七下数学周末练习6姓名:_________________一、选择题:1.计算(x -2y )2的结果是【 】A. x 2-2y 2 B. x 2-4y 2 C. x 2-4xy+4y 2 D. x 2-2xy+4y 22.计算()()b a b a --+33等于【 】A .2269b ab a -- B .2296a ab b --- C .229a b - D .229b a -3.若22)21(+=++x b ax x ,则a 、b 的值应该是【 】A 、21,1==b aB 、a=b=1C 、41,1==b a D 、41,21==b a 4.(-a+b)·P= a 2-b 2,则P 等于【 】A 、a -b B 、-a+b C 、-a -b D 、a+b5.为了应用平方差公式计算()()c b a c b a -++-,必须先适当变形,下列各变形中,正确的是【 】A.()[]()[]b c a b c a +--+B.()[]()[]c b a c b a -++-C.()[]()[]a c b a c b +--+D.()[]()[]c b a c b a -+--6.下列各式的计算中,正确的有【 】① (a+2b)(a -2b)= a 2-2b 2 ② (x -3y)2=x 2-3xy+9y 2;③ (-3a -2b)2= -(3a+2b)2= -9a 2-12ab -4b 2: ④ (2a -3b)( -2a+3b)=4a 2-12ab+9b 2A、0个 B 、1个 C 、2个 D 、3个7.运用完全平方公式计算79.82的最佳选择的是【 】A 、(79+0.8)2B .(80-0.2)2C .(70+9.8)2D .(100-20.2)28.若()()1532-+=++kx x m x x ,则m k +的值为【 】A 、3-B 、5C 、2-D 、2 9.下列各题中,形如222b ab a +±的多项式有【 】① 41—2+x x ② 22—b ab a + ③ 2244—b ab a + ④ 22410—25y xy x + ⑤ 1—412+y y ⑥ 1411612++m mA 、6个B 、5个C 、4个D 、3个10.若a 2+kab+9b 2是完全平方式,则k 的值为【 】A 、6 B 、-6 C 、6± D 、011.小聪计算一个二项整式的平方式时,得到正确结果4x 2+20xy+ ,但最后一项不慎被除污染了,这一项应是【 】 A 、5y 2 B 、10y 2 C 、25y 2 D 、100y 212.已知a 、b 满足等式x=4a 2+b 2+10,y=2(2a-3b),则x,y 的大小关系是【 】A 、x ≤yB 、x ≥yC 、x ≠yD 、 x=y13.满足(2x-3)200<4300的x 的最大整数为 【 】A 、5 B 、6 C 、7 D 、814.若代数式x= -2a 2+4a-2,则不论a 取何值,一定有【 】A 、x>0B 、x<0 C 、x ≥0 D 、x ≤015. 如图,从边长为(a +4)cm 的正方形纸片中剪去一个边长为()1a +cm 的正方形(0)a >,剩余部分沿虚线又剪拼成一个矩形(不重叠无缝隙),则矩形的面积为【 】A .22(25)cm a a +B .2(315)cm a +C .2(69)cm a +D .2(615)cm a +16. 从边长为a 的大正方形纸板中挖去一个边长为b 的小正方形纸板后,将其裁成四个相同的等腰梯形(图①),然后拼成一个平行四边形(图②).那么通过计算两个图形阴影部分的面积,可以验证成立的公式是【 】A .a 2-b 2=(a -b)2B .(a +b)2=a 2+2ab +b 2C .(a -b)2=a 2-2ab +b 2D .a 2-b 2=(a +b)(a -b)二、填空题:1.把下列各式配成完全平方式:(1) 25x 2+ +9y 2 = (5x -3y)2. (2) a 2+ +16b 2= ( )2(3) 16a 4+24a 2+ = ( )2 (4) ( )2-8p(m+n)+16p 2 =( )22.边长为m 的正方形边长减少了n (m >n) 以后,所得到较小正方形的面积比原正方形面积减小了 .3.若x -y=2 , x 2-y 2=16 , 则x+y=___________.4.若(5x +M )2=25x 2-10xy +N , 则M= ,N= .5.已知a+b=5, ab=-6,则a 2+b 2= , ( a -b) 2= .6.为确保信息安全,信息需要加密传输,发送方由明文→密文(加密),接收方由密文→ 明文(解密).已知加密规则为:明文a b c ,,对应的密文12439a b c +++,,.例如明文1,2,3对应的密文2,8,18.如果接收方收到密文7,18,15,则解密得到的明文为 7.若x 2-13x+1=0 ,则 , 。
生物周末练习
1.下列能在细胞核中发生转录的细胞是()
①有丝分裂中期的洋葱根尖细胞②精原细胞③高度分化不再分裂的神经细胞④人体内成熟的红细胞⑤效应T细胞⑥次级卵母细胞
A.②③⑤B.①③④⑥
C.①②③④⑤⑥ D.①②⑤⑥
2.下图为DNA控制蛋白质的合成过程,下面的说法正确的是( )
DNA片段①…—T—A—G…
②…—A—T—C…
信使RNA ③…—U—A—G…
转运RNA ④…—A—U—C…
氨基酸⑤……□……
A.图中标出的碱基符号,包括了8种核苷酸
B.DNA双链中①、②均为模板链
C.密码子位于③和④链上
D.②→③的转录过程只能发生在细胞核中
3.关于下面四图的叙述中,正确的是()
A.甲图中共有5种核苷酸
B.乙图所示的化合物中不含糖类物质
C.组成丙物质的单糖是脱氧核糖或核糖
D.在小鼠体细胞内检测到的化合物丁很可能是蔗糖
4.下列有关DNA和RNA的叙述,正确的是()
A.生物的遗传信息只存在DNA分子中
B.真核生物的遗传物质是DNA,而原核生物的遗传物质是DNA或RNA
C.原核生物的DNA上不存在密码子,密码子只存在于mRNA上
D.真核生物细胞内,既能以DNA转录形成RNA,RNA也能逆转录形成DNA
5.有关RNA的叙述,错误的是()
A.RNA是某些生物遗传信息的载体和催化剂
B.mRNA根据密码子依次将氨基酸连接成多肽
C.mRNA的主要功能是把DNA的遗传信息传给蛋白质
D.HIV的RNA中插入某些核苷酸会导致遗传信息改变
6.下列关于遗传密码子的叙述中,错误的是()
A.一种氨基酸可能有几种与之相对应的遗传密码
B.GTA肯定不是遗传密码子
C.每种密码子都有与之对应的氨基酸
D.信使RNA上的GCA在人细胞中和小麦细胞中决定的是同一种氨基酸
7.如图是某生物合成蛋白质的过程,下列说法正确的是()
A.发生该过程的细胞可能是原核细胞
B.mRNA上所含有的密码子均能在tRNA上找到相对应的反密码子
C.该图表示的两个过程分别发生在细胞核和细胞质中
D.mRNA产生过程中碱基之间有四种配对方式
8.下图为中心法则图解。
下列有关的叙述中,错误的是()
A.过程a只发生在有丝分裂的间期
B. 过程b和c为基因的表达,具有选择性
C.过程a、b、c、d、e都能发生碱基互补配对
D.过程d、e只发生在某些病毒
9.下图为基因的作用与性状的表现流程示意图。
请据图分析,正确的选项是()
A.①过程是转录,它以DNA的两条链为模板、四种核苷酸为原料合成mRNA B.②过程中只需要mRNA、氨基酸、核糖体、酶、ATP即可完成
C.人的镰刀型细胞贫血症是基因对性状的直接控制,使得结构蛋白发生变化所致
D.某段DNA上发生了基因突变,则形成的mRNA、蛋白质一定会改变
10.人类血管性假血友病基因位于X染色体上,长度180 kb。
目前已经发现该病有20多种类型,这表明基因突变具有( )
A.不定向性 B.可逆性 C.随机性 D.重复性
11.以下情况属于染色体变异的是( )
①21三体综合征患者细胞中的第21号染色体有3条②非同源染色体之间发生了互换
③染色体数目增加或减少④花药离体培养后长成的植株
⑤非同源染色体之间自由组合⑥染色体上DNA碱基对的增添、缺失或替换
A.②④⑤⑥ B.①③④⑤ C.②③④⑤ D.①②③④
12.在细胞分裂过程中出现了甲、乙两种变异,甲图中英文字母表示染色体片段。
下列有关叙述正确的是( )
①甲图中发生了染色体结构变异,增加了生物变异的多样性
②乙图中出现的这种变异属于染色体变异
③甲、乙两图中的变化只会出现在有丝分裂过程中
④甲、乙两图中的变异类型都可以用显微镜观察检验
A.①②③ B.②③④
C.①②④ D.①③④
13.图示细胞中含有的染色体组数目分别是( )
A.5个、4个 B.10个、8个 C.5个、2个 D.2.5个、2个
14.下列有关单倍体的叙述中,不正确的是( )
A.由未受精的卵细胞发育而成的个体
B.花药经过离体培养而形成的个体
C.凡是体细胞中含有的奇数染色体组数的个体
D.普通小麦含有6个染色体组,42条染色体,它的单倍体含有3个染色体组,21条染色体
15..在所有植物的下列各项中,肯定不存在同源染色体的是( )
A.卵细胞B.染色体组 C.单倍体D.极核
16.将基因型为AaBb(独立遗传)的玉米的一粒花粉离体培养获得幼苗,再用秋水仙素处理幼苗,获得植株的基因型是( )
A.Ab或ab或AB或aB
B.Ab、ab、AB、aB
C.AABB或aabb或AABb或aaBb
D.AABB或aabb或AAbb或aaBB
17.下列基因组合中,不可能是由二倍体产生的配子是( )
A.Dd B.YR
C.Ab D.BCd
18.如图表示人体某正常基因片段及其控制合成的多肽顺序。
A~D表示4种基因突变的位点。
A处丢失T/A,B处T/A变为C/G,C处T/A变为G/C,D处G/C变为A/T。
假设4种突变不同时发生。
则下列叙述不正确的是( )
注:除图中密码子外,已知GAC(天冬氨酸)、GGU和GGG(甘氨酸)、AU
G(甲硫氨酸)、UAG(终止信号)。
翻译时由左向右进行
A.A处突变会引起多肽链中氨基酸种类变化
B.B处突变对结果无影响
C.C处突变会引起多肽链中氨基酸数量变化
D.D处突变会导致肽链的延长停止
19.双子叶植物大麻(2n=20)为雌雄异株,性别决定方式为XY型,若将其花药离体培养,将幼苗用秋水仙素处理,所得植株的染色体组成是( )
A.18+XX或18+XY B.18+XX或18+YY
C.18+XX D.18+XY
20.下列有关人类遗传病的叙述,正确的是( )
A.遗传病一定是自亲代遗传而来,但不一定遗传给后代
B.应在人群中随机抽样调查以研究单基因遗传病的遗传方式
C.多基因遗传病与环境因素有一定的关系,在群体中发病率较高
D.从理论上分析,遗传病无法根治
选择题答题处:
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21.下图表示细胞内遗传信息表达的过程,根据所学的生物学知识回答:
(1)图2中方框内所示结构是_____的一部分,它在________中合成,其基本组成单位是________,可以用图2方框中数字________表示。
(2)图1中以④为模板合成⑤物质的过程称为______,进行的主要场所是[ ]________,所需要的原料是________。
(3)若该多肽合成到图1中UCU决定的氨基酸后就终止合成,则导致合成结束的终止密码是________。
(4)从化学成分角度分析,与图1中⑥结构的化学组成最相似的是( ) A.乳酸杆菌 B.T2噬菌体 C.染色体 D.流感病毒
(5)若图1的①所示的分子中有1 000个碱基对,则由它所控制形成的信使RNA 中含有的密码子个数和合成的蛋白质中氨基酸种类最多不超过( )
A.166和55 B.166和20 C.333和111 D.333和20
22.如下图是某种遗传病的家族系谱。
据图回答(以A、a表示有关基因):
(1)该病是由__________染色体上的__________性基因控制的。
(2)5号和9号的基因型分别是__________和__________。
(3)10号基因型是__________,她是杂合子的概率是__________。
(4)10号与一个患此病的男性结婚,则不宜生育,因为他们生出病孩的概率为__________。
23.如图所示表示三倍体无子西瓜的培育过程,据图解回答问题:
(1)用秋水仙素诱导四倍体西瓜植株,一般在种子萌发成幼苗期最有利,原因是________________________________________。
(2)第一年四倍体西瓜与二倍体西瓜杂交结出的果实中,其瓜瓤、种皮、胚及胚乳细胞中所含的染色体组数分别为__________;第二年三倍体无子西瓜结出的果实中,瓜瓤细胞所含的染色体组数为__________。
(3)种植三倍体西瓜时,通常间隔种植二倍体西瓜。
开花时,借助于昆虫将二倍体的花粉传授到三倍体植株的雌蕊柱头上,这项技术措施的目的是________________________。