2011-2012学年初中英语九年级（人教新目标）素材（含教案和练习）Unit 9 When was it invented?

2011-2012学年初中英语九年级（人教新目标）素材（含教案和练习）
Unit9 When was it in
一. 教学内容：
Unit 9 When was it invented
二. 学习目标：
1. 动脑筋，找规律，弄清主动语态与被动语态之间的差异，通过练习和运用加以巩固。
2. 学会使用含有被动语态的不同句型结构来谈论各种发明物的历史。
3. 通过熟悉我们周围经常使用的发明物的历史来开阔眼界，丰富自己的阅历，使自己养成勤于思考善于总结的好习惯。
三. 教学重点难点：
一般过去时的被动语态及本模块中的一些重点短语
四. 重点词和短语
1. be used for doing＝be used to do sth. 用来做某事
2. hand-held calculators 手提计算器
3. battery-operated slippers 用电池操作的拖鞋
4. in the dark 在黑暗中
5. shoes with adjustable heels 可调整后跟的鞋
shoes with high heels 高跟鞋
6. change the style of shoes 改变鞋子的式样
7. from casual to dressy 从休闲到正式
8. do sth. by mistake 错误的/巧合的做某事
9. in a bad mood 心情糟糕
10. in the end 最后，终于
at the end 在……的结尾，在……尽头
by the end 在……结束时，到……末为止
【即学即用】
At first he was strongly against our plan, but the end he gave in.
A. at B. in C. by D. to
11. by accident 偶然，意外
12. not… until 直到……才
13. according to
【即学即用】
the following pictures, please write a composition.
A. Thanks to B. Because of C. According to D. Instead of
14. an ancient Chinese legend 一个古老的中国传说
ancient culture 古文化
15. fall into 落入
16. some time 一段时间
sometime 某时
sometimes 有时
some times 几次
【即学即用】
My uncle will come next month and he will stay here for .
A. sometime; some time B. some time; sometime
C. sometimes; some time D. some time; some times
17. in this way 这样
18. travel around China 游览中国
19. much-loved and active sport 深受人们喜爱而且很活跃的运动
20. a doctor called/named… 一个叫……的医生
21. knock into sb 撞上某人
knock at the door 敲门
22. fall down 跌倒
23. divide sth into 把……分成
24. the aim of sth ……的目标
25. move/run towards 朝……方向移动/跑
26. It’s believed that 人们相信
It’s heard that 人们听说
It’s said that 据说
It’s thought that 人们认为
27. the first basketball game in history历史上第一场篮球赛
28. since then 从那以后
29. the popularity of ……的流行
30. rise worldwide 引起全世界广泛传播
31. the number of ……的数量
a number of 许多
【即学即用】
⑴ the students in their school over two thousand.
A. The number of; is B. The number of; are
C. A number of; is D. A number of; are
⑵Every year, water sports attract large numbers of tourists to Haikou.（词语替换）
A. a lot B. much C. many D. more
32. dream about /of doing sth 梦想做某事
五. 重点、难点、考点及疑点注释
1. They’re used for seeing in the dark. 它们被用于在黑夜里观看。（Section A, 2b）
be used for表示“被用来做……”，介词for表示目的和用途，后面接名词或动词-ing形式。相当于be used to do sth.。如：
Wood can be used for making paper.木材可以被用来造纸。
知识拓展
含有be used的常用短语：
◎be used as表示“被用作……”，介词as意思是“作为”的意思，其后一般接名词，强调使用的工具及手段。
This book can be used as a textbook.这本书可以当作教科书来用。
This piece of wood is used as a bench.把这块木头用作凳子。
◎be used by表示“被……使用”，by后接动作的执行者。
This kind of machine is used by farmers for getting in crops.
农民们用这种机器来收割庄稼。
【即学即用】
⑴The stones they carried were used houses and bridges.
A. to build B. for building C. to be built D. A and B
⑵The room as a meeting room.
A. used to being used B. was used to be used
C. was used to being used D. used to be used
2. I think the most helpful invention is the light bulb. 我认为最有用的发明是灯泡。（Section A, 3b）
helpful是由名词help加上-ful后缀构成的形容词，意为“有帮助的”，类似的形容词还有：
thank—thankful（感谢的，感激的） grate—grateful（感谢的，感激的）
use—useful（有用的） wonder—wonderful（令人惊奇的）
forget—forgetful（健忘的） success—successful（成功的）
beauty—beautiful（美丽的） pain—painful（疼痛的）
3. Potato chips were invented by mistake. 薯条的发明纯属歪打正着。（Section B, 2a）
⑴ potato chips是一个复合名词，其中第一个名词用作定语修饰后一个名词，这样的例子有很多，又如: alarm clock, telephone number等。
知识拓展
复合名词变复数的规则：
◎通常只把主体名词变为复数
school boy—school boys（男生） apple tree—apple trees（苹果树）
vegetable sandwich—vegetable sandwiches（蔬菜三明治）
girl friend—girl friends（女朋友）
◎由man, woman和另外一个名词构成的复合名词，两个部分都要用复数。
man teacher—men teachers（男教师）
woman doctor—women doctors（女医生）
⑵by mistake 表示“错误地（因粗心、遗忘等所致）”。
Sorry, I took your bag by mistake. 对不起，我错拿了你的手提包。
【注意】by 和mistake中间可以加相应的形容词性物主代词。
I took your pen by（my）mistake. 我错拿了你的钢笔。
4. George Crum cooked them for a long time until they were crispy. George Crum将它们煮了很长时间，直到它们变脆了。（Section B, 2b）
Although tea wasn’t brought to the Western world until 1610, this beverage was discovered over three thousand years before that. 尽管茶直到1610年才被带到西方国家，但这种饮料早在传入西方之前的三千年就被发现了。（Section B, 3a）
until意为“直到……”，引导一个时间状语。作介词时，引导一个短语；作连词时，引导一个时间状语从句。
◎until用于肯定句中，主句中的谓语动词必须是延续性、持续性动词，表示“直到……为止”。如：
I worked until late in the afternoon. 我一直干到下午很晚的时候。
I’ll wait for you until you come. 我要等到你来为止。
◎until用于否定句中，表示“直到……才……”，常与瞬间动词、短暂性动词连用，强调主句所表示的动作从until所表示的时间发生，主句必须是否定句。表示瞬间的动词有come, go, leave, meet, reach, get, arrive, realize, stop等。如：
He didn’t go home until ten o’clock. 他直到10点钟才回家。
（go home的动作是在10点钟才发生的。）
The rain didn’t stop until midnight. 雨直到半夜才停。
I won’t leave until you promise to help me. 你不答应帮助我，我不会离开。
【即学即用】
I won’t believe that little Bob can run 100 metres in 15 seconds I see it with my own eyes.
A. until B. after C. when D. if
◎discover 作动词，意为“发现”，即发现的对象是本来存在的，只是以前不知道而已，也可指发现新奇或意外之物或发现某种情况。“发现者”为discoverer。
相关链接
invent作动词，意为“发明”，发明的对象是以前没有的新东西，如工具、手段或方法。“发明”作名词用invention，“发明者”为inventor。
【即学即用】
用discover和invent填空
⑴Paper was in China.
⑵Columbus America in 1492.
⑶I that she was a good cook.
5. And in this way, one of the world’s favorite drinks was invented. 就这样，世界上最受欢迎的一种饮料产生了。（Section B, 3a）
本句中的in this way意为“就这样”，“以这种方式”。
The song was composed in this way. 这首歌就这样被创作出来了。
In this way, you will find the answer to this question.
用这种方法，你可以找到这个问题的答案。
知识拓展
way主要有以下几种用法：
◎表示“方法”，接不定式，...way to do sth这一结构等于...way of doing sth。
Scientists are trying to find ways to prevent（of preventing）disease.
科学家们正在寻找预防疾病的方法。
There are many ways of traveling（to travel）, for example, by air.
旅行有许多方式，例如乘飞机。
◎表示“路途”，“路线”，常构成on one’s/the way to...“在……的途中”。在这一结构中，介词to表示方向，后接名词。如果后面接地点副词如here, there, home时则不用to。
I’m on my way home.我正在回家的路上。
She’s on her way to see the film.她正在去看电影的路上。
◎表示“方向”。
Look this way.看这边。
Go that way.往那边走。
◎表示“距离”，“路程”。
Beijing is a long way from here.北京离这里很远。
6. It is believed that on December 21st, 1891, the first basketball game in history was played.人们认为历史上的第一次篮球比赛是在1891年12月21日。（Reading）
本句中的It is believed that... 为常见句型，相当于people believe that...是“人们相信/认为”的意思，其中it为形式主语，that引导的从句是真正的主语。类似的句型还有It is said that…, It is supposed that…等。如：
It is believed that by the year 2010, the population of the world will be seven billion.
＝People believe that by the year 2010, the population of the world will be seven billion.人们都认为到2010年，世界人口将达到七十亿。
It is said that they have won the game. 据说他们赢得了那场比赛。
【即学即用】
It’s that he’ll come here.
A. say B. supposed C. believe D. expect
7. …although they didn’t win they used the experience to help develop the game at home.尽管他们没有赢得比赛，他们却用自己获得的经验来帮助发展了国内的运动。（Reading）
⑴although引导让步状语从句，意为“尽管，虽然”。but也有“尽管，但是”的意思，但不可与although同时出现在同一句话中，且but用作并列连词。试比较：
Although it rained, the boys still played outside.
＝It rained, but the boys still played outside. 尽管天下雨了，但是那些男孩子们仍在外面玩耍。
⑵at home 在此意为“在本国，在国内”，多用于报刊新闻中。如：
The company is not as popular at home as it is abroad. 那家公司在国内不如在国外受欢迎。
【即学即用】
He sticks to his dream of becoming a famous football player, he can’t get support from his parents.
A. but B. although C. and D. so
六. 语法：
被动语态“模仿秀”
【1号】Thomas Edison invented the light bulb.
→The light bulb was invented by Thomas Edison.
【模仿秀】We will finish the task tomorrow.
→ .
【评委点评】
主动语态变被动语态：将主动语态变为被动语态时，谓语结构为：be + 过去分词，其中be的时态和主动语态的时态一致。
【2号】My father gave me a football on my 13th birthday.
→I was given a football（by my father）on my 13th birthday.
→A football was given to me（by my father）on my 13th birthday.
【模仿秀】Lucy shows us some photos of her family.
→ .
→ .
【评委点评】
含有双宾语的动词的被动语态：一般把代表人的宾语（间接宾语）变为被动句的主语，而把直接宾语留作被动句的宾语。如果把主动句的直接宾语变为被动句的主语，则间接宾语前需有介词（一般是to或for）。常接to的动词有：give, lend, show, pass等；常接for的动词有：borrow, make, buy等。
【3号】We find physics very hard.
→Physics is found very hard.
【模仿秀】I saw Mr Wang walk into the bank just now.
→ .
【评委点评】
带有复合宾语的动词的被动语态：主动句中如果有复合宾语（即宾语和宾语补足语），变为被动语态时，将句子的宾语（即复合宾语中的逻辑主语）变为被动句的主语（宾语补足语也转化成了主语补足语）。在主动语态中，make, let, have, see, watch, hear, feel, notice等使役动词或感官动词后常接不带to的动词不定式作宾语补足语，但在被动语态中需加上to。
【4号】The nurse takes good care of my daughter in the hospital.
→My daughter is taken good take of in the hospital（by the nurse）.
【模仿秀】You should pay more attention to your spelling.
→ .
【评委点评】
短语动词的被动语态：在变为被动语态时，不可丢掉构成短语动词的介词或副词，也不能将其拆开。
【5号】这种茶叶闻起来很清香。
→This kind of tea smells very nice.
【模仿秀】这款裙子很好卖。
→ .
【评委点评】
主动形式表示被动含义：有些动词的主动形式表示被动意义。这类动词有：wash, sell, smell, taste, sound, feel等。
被动语态中考真题大练兵
1. —Would you please tell Miss Li that she as a volunteer for the 2008 Olympic Games
—Of course. I will tell her tomorrow. （2007山东淄博）
A. choose B. chose C. has chosen D. is chosen
2. We not to play computer games. （2007内蒙古乌兰察布）
A. are told B. have told C. told D. tell
3. —Could you tell me whom the radio by
—Sorry. I have no idea. （2007福建福州）
A. invents B. invented C. is invented D. was invented
4. —Your hometown has changed a lot.
—Yes. Take a look at these tall buildings. They last year. （2007重庆课改区）
A. build B. built C. was built D. were built
5. —Did you go to Kang Kang’s birthday
—No, I . （2007福建宁德）
A. wasn’t invited B. didn’t invite C. am not invited
6. An English speech to the children tomorrow. （2007广东茂名）
A. is given B. has been given C. will be given
7. 根据汉语意思完成英语句子：
丢失的部件在船拖出水后被找到了。 （2007山东济南）
The lost parts after the ship was of the water.
8. She used the knife to cut the fruit a moment ago.（改为被动语态）（2007重庆非课改区）
The knife to cut the fruit by her a moment ago.
9. I sent a letter to you last month.（改为被动语态）（2007甘肃兰州）
A letter to you last month.
10. 用括号内动词的适当形式填空：
The dog （train）to understand different instructions for two years.（2007山东烟台）
答案：1~6 DADDAC
7. were found; pulled out 8. was used 9. was sent 10. has been trained
中考聚焦
考点1. by mistake
—Sorry, Jane. I took your schoolbag by .
—It doesn’t matter. （2006江苏盐城）
A. hand B. mistake C. bike D. heart
【要点简析】by mistake 意为“错误地”，在句中作状语。选B。
考点2. in the end
（词语替换）In the end, he decided to send the sick child to hospital. （2007四川成都）
A. At once B. At last C. At first
【要点简析】in the end 意为“最后，终于”，相当于at last / finally。选B。
考点3. pleasant
根据句意，用所给词的适当形式填空：
①It is rainy today, but tomorrow we’ll have （please）weather.（2007山东烟台）
②Most people like easy jobs and don’t like to do the （pleasant）work.（2007湖北随州）
【要点简析】pleasant形容词，意为“舒适的；令人愉快的”，一般指天气、时间、旅行等令人感到高兴、愉快和舒服。其反义词是 unpleasant。分别填写：①pleasant；②unpleasant。
考点4. It is said that…
— that China has the largest number of mobile phone users.
—I believe so. It seems everyone has one. （2007湖北宜昌）
A. Someone said B. They told me C. It is said D. I was told
【要点简析】所缺主句的时态要用一般现在时，和that从句的时态保持一致。句型It is said…意为“据说……”，其中it为形式主语，真正的主语是that从句。选C。
【模拟试题】（答题时间：80分钟）
I. 单项选择
1. Sunglasses are used protecting your eyes.
A. from B. by C. to D. for
2. the weather report, it will be snowy tomorrow.
A. Because of B. Instead of C. According to D. Hearing
3. I met a friend of mine in the street yesterday.
A. by accident B. by the end C. by mistake D. by car
﹡4. Did the police catch the thief
A. on the end B. by the end C. at the end D. in the end
5. he isn’t tall enough, he is good at basketball.
A. Because B. After C. Although D. Since
6. The beef so delicious that I like to eat some more.
A. tastes B. smells C. feels D. sounds
7. There was an important meeting last night. Mr Smith to it.
A. invites B. invited C. was invited D. is invited
﹡8. In our school library there a number of books on science and the number of them growing larger and larger.
A. is; are B. are; is C. has; is D. have; are
9. If you someone, you should say “I’m sorry”.
A. knock at B. knock over C. knock into D. knock out
﹡10. Many boys and girls are made what they’re not .
A. do; interesting B. to do; interesting C. do; interested in D. to do; interested in
11. that some foreigners will come to visit our village.
A. It is said B. They are said C. That is said D. Who is said
12. I took the wrong train. I didn’t even know it half an hour later.
A. to B. until C. by D. after
13. — , you can work out the problem easily.
—I see. Thank you.
A. On the way B. In this way C. By the way D. In a way
﹡14. I noticed them the teachers’ office just now.
A. went into B. go into C. are going into D. came out
﹡15. Can you tell me ？
A. who the machine invented B. who the machine invented by
C. who the machine was invented by D. who was the machine invented by
﹡II. 完形填空
The invention of the camera goes far into the past. In the 1500s, man was experimenting with cameras that made images. But man didn’t find a way to make the pictures continue to exist for all the time 16 the early 1800s. Even then, photography was a new field. Most families had their pictures 17 by photographers. People did not own cameras because taking pictures and developing the films were very difficult. In 1884, George Eastman changed photography by 18 a kind of film that could fit into a small camera. Because the new film was 19 to use, many people began to buy cameras. When they had 20 their films, people returned their cameras to the factory. There, the films were developed, and pictures were 21 . Then more films were put into the cameras, which were sent back to the owners, along 22 their pictures.
Today’s cameras are 23 easier to use, and people can put in their own films. Photography has become a growing hobby. There are also many new jobs in the field of photography. One of the most important kinds of work is in news reporting. Newspapers, magazines, and televisions all need pictures to tell their stories. Photographers help scientists 24 taking pictures through microscopes and telescopes. Deep-sea drivers take pictures of ocean plants and animals, while astronauts take their cameras into 25 . Man finds new uses for the camera every day.
16. A. before B. until C. when D. while
17. A. taken B. put up C. drawn D. taken away
18. A. making B. watching C. doing D. inventing
19. A. difficult B. easy C. quick D. safe
20. A. used for B. in use C. used to D. used up
21. A. taken B. done C. made D. drawn
22. A. to B. into C. with D. including
23. A. more B. very C. too D. much
24. A. to B. by C. with D. in
25. A. cars B. planes C. water D. space
III. 阅读理解
A
One day Mr. Robinson saw a woman in the street with ten children. He was very surprised because all the children were wearing the same clothes—white hats, blue coats and white pants.
“Are all those children yours ”he asked the woman.
“Yes, they are,” she answered.
“Do you always dress them in the same clothes ”asked Mr. Robinson.
“Yes,” answered the mother,“When we had only four children, we dressed them in the same clothes because we didn’t want to lose any of them. It was easy to see our children when they were among（在……中间）others because they were all wearing the same clothes. And now, when we have ten, we dress them like this because we do not want to take other children home by mistake（错误）.When there are other children among ours, it is easy to see them because their clothes are different.”
根据短文内容，选择正确答案。
26. One day ______.
A. Mr. Robinson met a woman teacher with 10 school children
B. Mr. Robinson met 10 children with their mother
C. the mother met Mr. Robinson with 10 school children
D. the mother met Mr. Robinson with his 10 children
27. －Why was Mr. Robinson surprised when he saw the ten children
－Because he saw that______.
A. they all had the same look
B. they were all the mother’s children
C. the woman had so many children
D. they were all dressed in the same way
28. When did the mother begin to dress her children in the same clothes
A. Just after she had the fourth child.
B. Just before the mother had ten children.
C. When she met Mr. Robinson in the street.
D. When she didn’t want to take other children home by mistake.
29. According to the story, we know that_____.
A. all the ten children are boys who are wearing the same clothes
B. all the woman’s children are girls who are in the same clothes
C. the children’s clothes had the same colour
D. the ten children are both the woman’s and Mr. Robinson’s children
30. When the woman has ten children, she dresses them in the same clothes because______.
A. the mother wants to show it to Mr. Robinson
B. she doesn’t want to take other children by mistake
C. she wants to take them to walk in the street
D. it’s very easy to find them in the street
B
Baseball（棒球）is one of the favorite sports in the USA. Children play baseball in sports field or parks.
At summer picnic, there is often an informal（非正式）baseball game. Boys and girls, young and old take turns to bat（击球）. Each team has nine players.
The baseball season goes from April to September. During this time, baseball matches are shown on TV and members of the important baseball teams become America’s heroes. At the end of the season the two top teams play against each other. Many baseball fans go along to watch the game. Millions of others listen to the radio and watch television. People seem to talk only about the game. Even long after it is over, they will still talk about the result and players.
American baseball is perhaps the most popular sport in the USA. The football season begins when the baseball season ends. More people are interested in football than baseball. When there is an important game, thousands of people sit beside the radio or in front of the television set to hear the result.
31. According to the short passage, which is wrong
A. Boys and girls all like baseball.
B. Baseball is played in the open air.
C. A baseball match has nine players.
D. Children sometimes play baseball in parks.
32. American people play baseball in _____.
A. April, May, June, July, August and September
B. September, December, November, December, January, February, March
C. January, February, May, April, and June
D. October, November, December, January, February and March
33. What happens at the end of the baseball season
A. People talk only about football games.
B. Many baseball fans become members of top teams.
C. A lot of people join the games.
D. Two top teams play a wonderful baseball game.
34. _____ follows the baseball season in the USA.
A. The basketball season B. The football season
C. The volleyball season D. The tennis ball season
35. This passage mainly tells us something about _____.
A. the football season in the USA
B. football is more interesting than baseball in the USA
C. the difference between baseball and football
D. the baseball season in the USA
﹡C
It’s important to learn how we can protect the environment. Here are 5R rules for us.
Reduce. If you want to reduce waste, you should use things more wisely. A large number of trees are being cut down to make paper. If everyone uses paper carelessly, soon we would not have any trees left. Other things are also being wasted, and people don’t know what to do with the waste in big cities. So it is necessary to reduce the amount of waste we produce.
Reuse. You should always think of reusing things before throwing them out. For example, give the clothes you do not use or the ones which are too small to the poor. In a family, you may pass on such clothes to younger brothers or sisters.
Recycle. Bottles, cans and paper can easily be recycled. By doing so we save lots of time and money. For example, coke cans are sent to a factory, where they are smashed flat and melted. The metal can be used to make new coke cans.
Recover. When you buy a box of apples, there may be a few rotten ones. You have two choices: one is to throw the apples away, the second is to throw the rotten parts and keep the good parts. In this way, you are recovering the eatable parts of food.
Repair. If one of the legs of your table is broken, you should repair it. If you want to buy something newer and better, it is better for you to sell the old item, or give it to people who can use it after repairing it.
Learn the rules to protect our environment. Let’s try our best to make the earth cleaner and more beautiful.
36. The “Reduce” rule mainly asks us ________.
A. to use things more wisely B. to cut down lots of trees
C. to use a lot of paper D. to throw away your old clothes
37. What should you think of before you throw things out
A. Buying new ones. B. Reducing. C. Reusing. D. Eating them.
38. What’s the correct order for recycling coke cans
a. collect the used cans b. melt them c. smash them flat d. send them to a factory
A. abcd B. adcb C. bdca D. cabd
39. The “Recover” rule mainly asks us ________.
A. to keep waste things B. to cover waste things with earth
C. to keep the useful parts D. to throw everything away
40. What is the first suggestion that you should do with broken items
A. To throw them away. B. To repair them.
C. To sell them. D. To put them in a cupboard.
IV. 根据句意及首字母提示，补全单词。
41. Edison is the greatest i in the world.
42. We know that tea was invented by a .
43. One c means a period of one hundred years.
44. I k at the door, but there was no answer.
45. The girl is shy. She stands with her back t us.
46. The pretty girl gave me a p smile.
47. Mom had added salt to the soup, but it wasn’t s enough.
48. China is a d country now.
49. The n on the door said that the library was closed.
50. Boys, stop t stones at the poor dog.
V. 从方框中选择恰当的句子补全下列对话，使对话意思完整。（其中有两项多余）
A. What’s it used for B. That sounds interesting.C. It’s very useful.D. How can it fly E. Who invented it F. How was it invented G. It’s used for opening and locking our auto-bike.
A: Look at that strange thing, Wei Hua! What’s that
B: It’s a key. 51
A: Auto-bike What’s it then 52
B: It’s a battery-operated machine and it was invented by my father!
A: 53
B: It’s used for riding or flying.
A: Flying 54
B: You can just ride it like an auto-bike and it will fly as it goes faster enough.
A: 55 I think your father is so great!
B: I think so. He has invented many things.
VI. 书面表达
根据下面的提示，写一篇关于“汉堡包”这一发明的文章。词数不少于60。
内容提示：
1. 以前西方人吃面包、肉和蔬菜；
2. 一位欧洲人在面包中加入肉和蔬菜；
3. 是一位来自德国汉堡的人把它带到了美国，故被称作“汉堡”；
4. 很受人们的喜爱，尤其是年轻人。
参考词汇：欧洲人European；汉堡hamburg；德国Germany；德国人German
【试题答案】
I. 1~5 DCADC 6~10 ACBCD 11~15 ABBBC
II. 16~20 BADBD 21~25 CCDBD
III. 26~30 BDACB 31~35 CADBD 36~40 ACBCB
IV. 41. inventor 42. accident 43. century 44. knocked
45. towards 46.pleasant 47. salty
48. developing 49. notice 50. throwing
V. 51~55 GEADB
VI. There was no hamburger in the world before. Westerners ate bread, meat and vegetables. One day a European put several pieces of meat and some fresh vegetables between two pieces of bread. He ate it and it tasted delicious. So a kind of food was invented in this way. Later a man from the city of hamburger in Germany brought it to America. And soon it became a kind of popular American food. Now many people, especially young people , like hamburgers very much.