人教版小学二年级数学下册知识点预习第一单元 数据整理与收集1.学会用正字记录数据。2.会数正，知道一个正字代表数量5。3.根据统计表，会解决问题。例：气象小组把6月份的天气作了如下记录：(1) 把晴天、雨天、阴天的天数分别填在下面的统计表中。天气名称晴天雨天阴天天数(2) 从上表中可以看出：这个月中( )的天数最多，( )的天数最少。(3) 这个月中阴天有( )天。(4) 这个月中晴天比雨天多( )天。(5) 这个月中阴天比雨天多( )天。(6) 你还能提出什么问题?第二单元 表内除法（一）1.平均分的含义：每份分得同样的多，叫做平均分。除法就是用来解决平均分问题的。2.平均分里有两种情况：（1）把一些东西平均分成几份，求每份是多少；用除法计算，总数÷份数=每份数例：24本练习本，平均分给6人，每人分多少本？列式：（2）包含除（求一个数里面有几个几）把一个数量按每份是多少分成一份，求能平均分成几份；用除法计算，总数÷每份数=份数例：24本练习本，每人4本， 能分给多少人？列式：3、除法算式的读法：从左到右的顺序读，÷读作以，=读作等于，其他数字不变。4、除法算式各部分名称：被除数÷除数=商。例：42÷7=6 42是（被除数），7是（ ），6是（ ）；这个算式读作（ ）。5.一句口诀可以写四个算式。（乘数相同的除外）。例：用三八二十四这句口诀解决的算式是（ ）A、24÷6= B、4×6=C、24÷3= D、24÷4=6、用乘法口诀求商，想：除数×商=被除数。第三单元 图形的运动1、轴对称图形：沿一条直线对折，两边完全重合。对折后能够完全重合的图形是轴对称图形，折痕所在的直线叫对称轴。成轴对称图形的汉字：一，二，三，四，六，八，十，大，干，丰，土，士，中，田，由，甲，申，口，日，曰，木，目，森，谷，林，画，伞，王，人，非，菲，天，典，奠，旱，春，亩，目，山，单，杀，美，春，品，工，天，网，回，喜，莫，罪，夫，黑，里，亚。2、平移：当物体水平方向或竖直方向运动，并且物体的方向不发生改变，这种运动是平移。只有形状、大小、方向完全相同的图形通过平移才能互相重合。3、旋转：物体绕着某一点或轴进行圆周运动的现象就是旋转。（一）填空1、汽车在笔直的公路上行驶，车身的运动是( )现象2、长方形有( )条对称轴，正方形有( )条对称轴。3、小明向前走了3米，是( )现象。4、如果一个图形沿着一条直线对折，两侧的图形能够完全重合，这样的图形叫做( )图形，这条直线就是( )（二）判断1、圆有无数条对称轴。 ( )2、张叔叔在笔直的公路上开车，方向盘的运动是旋转现象。 ( )3、所有的三角形都是轴对称图形。 ( )4、火箭升空，是旋转现象。 ( )5、树上的水果掉在地上，是平移现象 ( )（三）选择1、教室门的打开和关闭，门的运动是( )现象。A.平移 B旋转 C平移和旋转2、下面( )的运动是平移。A、旋转的呼啦圈 B、电风扇扇叶 C、拨算珠第四单元 表内除法二这单元主要是考口算题。有以下几种形式：1、用7、8、9的乘法口诀求商求商方法：想除数×（ ）=被除数，再根据乘法口诀计算得商。例.直接口算：28÷4　 8÷82、解决问题求一个数里有几个几，和把一个数平均分成几份，求每份是多少，都用除法计算。例.填空：45÷9=5 表示把（）平均分成（）份，每份是（）；还表示（　）里有（）个（）；第五单元 混合运算1、同级运算：（连加，连减，连乘，连除，加减混合，乘除混合）在没有括号的算式里，只有加、减或只有乘、除法按照从左向右的顺序，依次计算。同级运算的类型：+ +，－ －，+ －，－ +× ×，÷ ÷，× ÷，÷ ×例：23+6+18 97－34－2832+11-8 53－24+382× 3 ×8 81÷9 ÷32× 8÷4 72÷ 8×42、非同级运算：（乘加，乘减，除加，除减）在没有括号的算式里，如果有乘、除法，又有加、减法，要先算乘、除法，再算加、减法。不同级运算的类型：× + ， × －， + ×， － ×÷ + ， ÷ －， + ÷， － ÷例：5× 6 +14 3× 7－163 + 5 ×9 45－ 9×345÷9+14 64÷ 8－813 + 56÷7 64－ 40 ÷83、带小括号运算的类型：×（ + ）， ×（－），（ + ）÷， （－ ）÷。算式里有括号的，要先算括号里面的。例：6×（7 + 2） （24－18）×9（ 14+35 ）÷7 （82－18 ）÷84.把两个算式合并成一个综合算式。（重点）。先看分步算式的第二步算式，再看其中第一个数和第二个数哪个数是前一步算式的结果，就用前一步算式替换掉那个数，其他的照写。当需要替换的是第二个数，必要时还需要加上小括号。例：6×7=42

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- 1 -The Mystery Knight A Tale of the Seven KingdomsA light summer rain was falling as Dunk and Egg took their leave of Stoney Sept. Dunk rode his old war horse Thunder, with Egg beside him on the spirited young palfrey he'd named Rain, leading their mule Maester. On Maester's back were bundled Dunk's armor and Egg's books, their bedrolls, tent, and clothing, several slabs of hard salt beef, half a flagon of mead, and two skins of water. Egg's old straw hat, wide-brimmed and floppy, kept the rain off the mule's head. The boy had cut holes for Maester's ears. Egg's new straw hat was on his own head. Except for the ear holes, the two hats looked much the same to Dunk. As they neared the town gates, Egg reined up sharply. Up above the gateway, a traitor's head had been impaled upon an iron spike. It was fresh from the look of it, the flesh more pink than green, but the carrion crows had already gone to work on it. The dead man's lips and cheeks were torn and ragged; his eyes were two brown holes weeping slow red tears as raindrops mingled with the crusted blood. The dead man's mouth sagged open, as if to harangue travelers passing through the gate below. Dunk had seen such sights before. "Back in King's Landing when I was a boy, I stole a head right off its spike once," he told Egg. Actually it had been Ferret who scampered up the wall to snatch the head, after Rafe and Pudding said he'd never dare, but when the guards came running he'd tossed it down, and Dunk was the one who'd caught it. "Some rebel lord or robber knight, it was. Or maybe just a common murderer. A head's a head. They all look the same after a few days on a spike." Him and his three friends had used the head to terrorize the girls of Flea Bottom. They'd chase them through the alleys and make them give the head a kiss before they'd let them go. That head got kissed a lot, as he recalled. There wasn't a girl in King's Landing who could run as fast as Rafe. Egg was better off not hearing that part, t

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BeverlyCleary ILLUSTRATED BY Tracy Dockray Contents 1. Ribsy and the Roast 1 2. Henry Gets Rich 34 3. The Untraining of Ribsy 74 4. Henry Parks His Dog 106 5. Beezus Makes a Bid 130 6. Henrys Bargain Bike 151 7. The Boy Who Ate Dog Food 174 About the AuthorOther Books by Beverly ClearyCreditsCoverCopyrightAbout the Publisher1 Ribsy and the Roast Henry Huggins stood by the front window of his square white house on Klickitat Street and wondered why Sunday afternoon seemed so much longer than any other part of the week. Mrs. Huggins was reading a magazine, and Mr. Huggins, puff-ing on his pipe, was reading the funnies in the Sunday Journal. Henrys dog, Ribsy, was asleep in the 1 middle of the living room rug. As Henry looked at him, he suddenly sat up, scratched hard behind his left ear with his left hind foot, and flopped down again without even bothering to open his eyes. Henry pressed his nose against the win-dowpane and looked out at Klickitat Street. The only person he saw was Scooter McCarthy, who was riding up and down the sidewalk on his bicycle. I sure wish I had a bike,Ž remarked Henry to his mother and father, as he watched Scooter. I wish you did, too,Ž agreed his mother, but with prices and taxes going up all the time, Im afraid we cant get you one this year.Ž Maybe things will be better next year,Ž said Mr. Huggins, dropping the funnies and picking up the sport section. Henry sighed. He wanted a bicycle now. He could see himself riding up and down Klickitat Street on a shiny red bike. He would wear his genuine Daniel Boone coonskin cap with the snap-on tail, only he wouldnt wear the tail fastened to the hat. He would tie it to the handle bars so that it would wave in the 3breeze as he whizzed along. Henry,Ž said Mrs. Huggins, interrupting his thoughts, please dont rub your nose against my clean window.Ž All right, Mom,Ž said Henry. I sure wish something would happen around here sometime.Ž Why dont you go over to Roberts h

上传时间：2024-02-06 页数：209

Chapter 1 The cafeteria at Lakewood Elementary was filled with kids eating lunch. Some of them had brought sandwiches from home. rest were eating school lunches. Today's choices featured a mystery meat covered in gravy. A few teachers wandered between the tables trying to keep the noise under control. Let's keep it down, said Mr. Ratburn. He shook his head. I don't think anyone's listening.'' Miss Sweetwater nodded. "Or maybe TheThey just can't hear us.'' She said.1At one of the middle tables, Arthur and Francine smiled. '' That didn't take his friends were finishing up. long,'' she said. Arthur was poking at his food with a Arthur flexed his hands " We justtake a fork. ''Even without the gravy, " he said little while to warm up. where ''we'd have no idea this came " All right, " said Sue Ellen. Let us know from.'' when you're nice and toasty. " Ready for action, boys? Francine " Maybe we'll need a substitution said asked .Buster. He turned to Binkv Barnes. " Do " Ready,'' said Arthur.He put aside his you want a turn?" tray. " No, said Binky, crushing another car- " And waiting, " said Buster. ton with his fist. He just liked making They started a game of milk hockey. pucks. Francine and Sue Ellen made up one team. "Attention please! " Arthur and Buster were the other. They Miss Tingley, the school secretary, was used a crushed milk carton as a puck, hit- speaking over the loudspeaker. ting it back and forth the length of the "Arthur Read, please report to Principal table. Haney's offi ce immediately.'' Francine dodged left and flipped the car- A hush fell over the room. Everyone ton past Arthur's hand. Buster tried to stop was staring at Arthur. Buster's mouth was it, but the puck slid past him off the table. wide open. Binky's hand had frozen in "Goal!" said Muffy. She was the official mid-crush. scorekeeper. ''Uh-oh!" said Francine. 23k1I'' I 'llsay," said Muffy. \ •  Sue Ellen just shook her head. _ - 0 , t " You're in real trouble now, Arthur,'' --1

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BeverlyCleary ILLUSTRATED BY Tracy Dockray Contents 1. The Rich Uncle 1 2. Ramonas Problem 29 3. Being Good 47 4. Picky-picky 64 5. IT 81 6. A Surprise, Sort Of 100 7. The Chain of Command 119 8. The Families Get Together 132 9. Ramona Saves the Day 146 10. Another Big Event 167 About the Author Other Books by Beverly Cleary Credits Cover Copyright About the Publisher 1 The Rich Uncle Guess what? Ramona Quimby asked one Friday evening when her Aunt Beatrice dropped by to show off her new ski clothes and to stay for supper. Ramonas mother, father, and big sister Beezus, whose real name was Beatrice, paid no attention and went on eating. Picky-picky, the cat, meowed through the basement door, asking to share the meal. 1 Aunt Beatrice, who taught third grade, knew how to behave toward her third-grade niece. What? she asked, laying down her fork as if she expected to be astounded by Ramonas news. Ramona took a deep breath and an-nounced, Howie Kemps rich uncle is coming to visit. Except for Aunt Bea, her family was not as curious as Ramona had hoped. She plunged on anyway because she was happy for her friend. Howies grand-mother is really excited, and so are Howie and Willa Jean.And so, to be truthful, was Ramona, who disliked having to go to the Kemps house after school, where Howies grandmother looked after her grandchildren and Ramona while the two mothers were at work.A rich uncle, even someone elses rich uncle, should make those long after-school hours more interesting. I didnt know Howie had a rich uncle, said Mrs. Quimby. 2 Hes Howies fathers little brother, only now hes big, explained Ramona. Why, that must be Hobart Kemp, said Aunt Beatrice. He was in my class in high school. Oh, yes. I remember.That boy with the blond curly hair who played baseball. Mrs. Quimby motioned to her daughters to clear 3away the plates. All the girls said he was cute. Thats the one, said Aunt Bea.He used to chew licorice and spit on th

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