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高中英语北师大版 (2019)必修 第三册Lesson 3 A Musical Genius课前预习ppt课件
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这是一份高中英语北师大版 (2019)必修 第三册Lesson 3 A Musical Genius课前预习ppt课件，共51页。PPT课件主要包含了Advantages，haze，Para 1，Para 2，Para 3，Para 4，Para 5，Para 6，Today，Thanks to等内容，欢迎下载使用。
1. Which means f transprt d yu ften chse in yur daily life? 2. Which means f transprt d yu think is envirnmentally friendly?3. Have yu tried shared bikes?
transprtatin
Pre-reading
Are there any shared bikes in yur neighburhd r arund yur schl? What d yu think are the advantages and disadvantages f them?
causing parking prblems causing accidents n the rad
cnvenient saving energy reducing pllutinprviding public transprt making “the last-mile distance” easy
Disadvantages
n. (车辆等的) 停放
With the develpment f science and technlgy, transprtatin in cities is imprving, but with the cnvenience it has brught us, sme ther prblems are cming ut. Hw can we change the situatin?
traffic jam
air pllutin
Can yu guess in which city the idea f “shared bikes” was brn?
Amsterdam 阿姆斯特丹the capital f Netherlands
Amsterdam is a city with cyclists. It has the highest prprtin f bicycles in the wrld — 14 millin bicycles amng 15 millin peple!
Fast-reading
A. The white bikes are backB. Bike-sharing is mre and mre ppular in the wrldC. Hw the white bikes beganD. The cnvenience and prblems f bikes in ChinaE. Hw the white bikes affect Amsterdam F. Amsterdam is a gd place fr cycling
Match the main idea f each paragraph.
Amsterdam is called "the City f Bicycles". Why is it a gd city fr cycling? Read the first paragraph and take ntes abut the reasns.
Why is Amsterdam a gd city fr cycling?________________________________________________________________________________________________________________________________________________________________________________________________________________________
It’s flat and therefre cnvenient fr bicyclesThere are plenty f places fr bicycles parking; Mst streets in the city centre have a bicycle 38% f all trips are made by bike
Where did the idea f “white bikes” start? What happened t it sn after, and what is the situatin nw? Read the rest f the text. Make ntes in the table.
Develpment f "White Bikes"
Peple in Amsterdam first had the idea fr “white bikes”. They wanted t reduce the amunt f traffic and pllutin in the city centre. They painted hundreds f white bikes and left them arund the city centre fr peple t use. Within a matter f weeks, the bikes had all been stlen and the prject came t an end.
“White bikes” returned t Amsterdam. This time every bike had a cmputer tracking system in it t make it pssible t recrd its mvements and yu had t use a special card t take a bike.
Bike-sharing is becming mre and mre ppular in cities arund the wrld, including Chinese cities.
Understanding Develpment f EventsThe develpment f events talks abut hw ne event fllwed anther t create a certain situatin.Find the starting pint f the events.Find ut when and where the events develped.Find ut what prblems develped and what the cnsequences f the develpment were.
Skill Builder
1 Why did cycling fans put frward the idea f “white bikes” in the 1960s?
Answer the fllwing questins based n yur ntes.
They were hpeful that this wuld help t save energy, reduce pllutin and prvide free public transprt.
2 What is the difference between the “white bikes” f the 1960s and f 1999?
3 What effects have “white bikes” had n Amsterdam?4 Why has the idea spread t ther parts f the wrld in recent years?
Peple can nw enjy clean air and easy transprt in central Amsterdam.
Because bike-sharing is a cheap and easy way t save energy, reduce air and nise pllutin, and enjy the benefits f exercises in cities.
Intrduce “white bikes” in Amsterdam with the help f the flw chart.
“White bikes” in the 1960spurpsesactinsresults
Influence in the wrld
Amsterdam: the City f Bicycles
The return f “white bikes” in 1999actinsresults
Act as museum guides t make the intrductin using the mind maps created in the last activity.
Student A: AmsterdamStudent B: in the 1960sStudent C: 1999Student D: nwadays
Imagine what the situatin will be like in ur city as far as bike-sharing is cncerned in 10 years frm nw? Hw can yur ideas be achieved? What fficial decisins need t be made? Hw peple will be infrmed?
Think and share.
1 What des the title “‘White Bikes’ n the Rad” mean?
“White bikes” n the rad refers t “white bikes” being used t ride arund the streets f a city. Apart frm the literal meaning, the title can als mean that the effrt t implement “White bikes” prjects takes time and it’s still n the way. There’s still aspects that need t be imprved.
2 What des the writer mean by saying “Where will bike-sharing g in China? Yu decide”?
Yung peple like the students will determine hw successful bike-sharing is in the future by deciding whether r nt and hw much they want t use it. It can als mean that whether r nt bike-sharing can exist successfully depends n each individual. Everyne has t take the respnsibility t take care f bike-sharing s that it can last lnger and help peple better.
Peple in Amsterdam have been 1____________________ cycling fr years. They are particularly lucky because the city is very flat and therefre 2____________ cycling. Back in the 1960s, a grup f cycling fans 3_____________ an idea f using free shared bikes. They believed that this wuld help t 4_____________, 5______________ and 6_________________________.
Cmplete the summary with the infrmatin yu have learnt.
enjying the benefits f
cnvenient fr
came up with
save energy
reduce pllutin
prvide free public transprt
Hwever, shrtly after setting up the new system, there was a serius prblem as all the bikes 7______________. In 1999, the bike-sharing idea returned t Amsterdam. This time they were 8_____________ a cmputer 9______________. 10______________ the effrts f many peple, the idea f “shared bikes” has nw pedalled its way arund the wrld.
disappeared
designed with
tracking system
What makes “white bikes” successful in Amsterdam?What factrs influence the develpment f bike-sharing?
What are the similarities and differences between “white bikes” in Amsterdam and shared bike in yur city/ twn?
Similarities:1. Peple use them fr shrt jurneys.2. There’s a cmputer tracking system t recrd their every mve.3. They’re painted in bright clurs.
1. disappear vi 消失；不见 disappearance n 消失；不见
Sn after, hwever, prblems came up and the “white bikes” all disappeared... (教材P37)然而不久就出现了问题，“白色自行车”全都消失了……
Fucs n Language: Imprtant wrds
① Many beautiful fish are fast disappearing because f the severe pllutin.因为污染严重，许多美丽的鱼类正在迅速消失。② He disappeared int the dark. 他消失在黑暗中。③ I watched her disappear frm my hrizn.我看着她从我的视线消失。④ The sun disappeared behind the cluds.太阳消失在云丛后面。
2. prvide vt 提供；供应
They were hpeful that this wuld help t save energy, reduce pllutin and prvide free public transprt. (教材P36)他们希望这样能够节约能源，减少污染并提供免费的公共交通。
① She prvided her father with all the fd and mney he wanted.她给她父亲提供他所需要的食物和钱。② He was very pr because he had t prvide fr five children.他很穷，因为他要抚养五个孩子。
1. cme up with 想出；想到
In the 1960s, a grup f cycling fans came up with an idea. (教材P36) 20世纪60年代，一群骑行爱好者提出了一个想法。
cme up 走近；上来；被提出 cme ut 出来；出版cme abut 发生；产生 when it cmes t... (t为介词) 当谈到…… cme acrss 遇见；(偶然) 发现cme t 苏醒；总计；达到
Fucs n Language: Imprtant phrases
① He came up with a really creative slutin t the prblem.他找到一个真正具有创造性的解决问题的方案。② Can yu tell me when it came abut?你能告诉我这是何时发生的吗？③ I came acrss my ld friend at the ffice yesterday.昨天在办公室，我偶然碰见了我的老朋友。④ When it cmes t making friends, yu cannt be t careful.一谈到交朋友，你再怎么小心也不为过。
2. thanks t 幸亏；由于；因为
Thanks t the ideas and effrts f many peple, like the cycling fans in the 1960s and thse wh enabled the return f “white bikes”, yu can nw enjy clean air and easy transprt in central Amsterdam. (教材P37)由于这个创意以及众多人的努力，如20世纪60年代的骑行爱好者和那些让 “白色自行车” 回归的人，现在人们可以在阿姆斯特丹的市中心享受清新的空气和便利的交通。
thanks fr 因……而感谢 thanks a lt 非常感谢；多谢many thanks 多谢，十分感谢① Thanks fr yur help.非常感谢您对我的帮助。② Many thanks fr yur invitatin.非常感谢你的邀请。③ Thanks a lt fr everything yu did fr me.非常感谢你为我做的一切。
1. Peple wuld leave the bike in the place where they finished their jurney, s that smene else culd then take it and use it frm there. (教材P37)人们在行程结束时就地停放自行车，以便其他人能继续使用。
Fucs n Language: Imprtant sentences
[句式解读] 句中s that引导目的状语从句，从句中含有情态动词culd。s that引导目的状语从句，意为 “以便，为了”，可用in rder that 替换，从句中常有may, can, culd等情态动词。
① I will leave s that yu can cncentrate n yur wrk.我这就走，以便让你专心工作。② He came in quietly s that he wuldn’t wake his wife up.他轻轻地进来，为了不把他的妻子吵醒。
③ I gt up early, s that I caught the first bus.我起得很早，所以赶上了第一班公共汽车。④ Suddenly it began t rain heavily, s that it was almst impssible t carry n driving.突然下起了大雨，几乎无法继续开车。
s that引导结果状语从句，意为 “因此，所以”，通常不与情态动词连用，从句前可用逗号与主句隔开。
2. T take a bicycle, yu had t put in a special card. (教材P37)要使用自行车，必须插入专用的卡片。
[句式解读] 句中t take a bicycle为不定式短语作目的状语。动词不定式作目的状语通常译为“为了……”，主要有以下三种结构形式：
① They wrked hard t get gd marks in the final exams.为了在期末考试中得到高分，他们很用功。② They tk exercise every day t keep healthy.他们为了保持健康每天运动。③ In rder t learn spken English well, he ften talks with American friends.为了学好口语他常常和美国朋友交谈。④ Lily saw many Chinese films s as t knw mre abut China.莉莉看了很多中国电影以便更多地了解中国。
Fcus n Grammar
一、在英文中，有许多“名词活用作动词”的现象。或者说，这些单词本身就有动词的意思，只是我们在学习这些单词的时候通常只接触了其名词的意思。
举个最简单的例子 “man” 这个单词，我们都知道是人、男人的意思，但它也可以作动词，有操作、配置人员、使增强勇气、拿出男子气概等意思。Yu need t man up and wn up t yur mistake.你要像个男人一样承认自己的错误。
二、熟练掌握这种名词和动词之间的转换具有非常重要的意义，对于我们英语水平的提高也至关重要。它的主要作用体现在：
1.让语言更加简洁比如说表示“我坐公共汽车去上班”这个意思，你可以说“I take a bus t wrk”也可以说“I bus t wrk”。当bus作动词时既包含了乘坐这个动作，又包含了所乘坐的交通工具，所以可以帮助省略不必要的take，让说话写作更加简洁明了。
2.使语言更加生动比如crner这个单词，名词意思是角落、墙角，动词的意思则有转弯、垄断、使为难等等。With this new technlgy, we are ging t crner the market within the next tw years.有了这项新科技，我们将在未来两年垄断市场。当crner这个单词作垄断意思解释的时候非常形象，想象一下一家公司把所有竞争者都逼到了墙角，这不就是垄断吗？还有个单词entrance，名词解释是入口，但当它作动词时就变成了使着迷、欣喜若狂。Her beauty entrances him. 她的美丽让他痴迷。
所以如果能做到名词的动词活用，可以使英文的语句更加具有画面感。
3．使语言更加地道比如用英文表达 “他著有两本畅销小说”。当然可以说“He has written tw best-selling nvels”，但这里的write让人感觉只是“写”，而没有“著”，所以会显得不够书面，不够地道。如果用authred来取代written就可以准确地表达出句子。英文单词中名词作动词的情形远远不止以上的例子。比如还有一组植物的名词，像花flwer、杂草weed、植物plant、种子seed、根rt等等都可以作动词使用，分别是成熟、除草、种植、播种、固定的意思。
随着人类社会的不断前进，语言也不断地向前发展，旧词少用，新词产生，语言变得越来越生动、形象，富于表现力和丰富多彩。人们常常用转化法、合成法、派生法等来创造新词。转化法: 就是词类转化，或叫词性转化，即利用某些词本身固有的特点，把原属于一类词性的词转化成另一种词类，即一种词类不经过任何词态变化而有意地作另一类词使用，同时又没有失去原有词内在的意思。
假设你是星光中学的李华，将参加主题为“Let’s Ride Bicycles” 的英语演讲比赛。请撰写一份演讲稿，主要内容包括：1. 目前汽车带来的空气污染和交通堵塞等问题；2. 骑自行车的益处，如节能环保、有利健康等。参考词汇：低碳生活 (lw carbn life)；节能 (energy saving)注意：1. 词数：120词左右；2. 演讲稿开头和结尾已给出，不计入总词数。
优点：带来方便, 重要交通方式
带来问题：空气污染、交通堵塞
参考词汇：cnvenienttraffic jamsave energy envirnmentally friendlybenefit / beneficial lw carbn lifeenergy-saving keep fit
1. Which means f transprt d yu ften chse in yur daily life? 2. Which means f transprt d yu think is envirnmentally friendly?3. Have yu tried shared bikes?
transprtatin
Pre-reading
Are there any shared bikes in yur neighburhd r arund yur schl? What d yu think are the advantages and disadvantages f them?
causing parking prblems causing accidents n the rad
cnvenient saving energy reducing pllutinprviding public transprt making “the last-mile distance” easy
Disadvantages
n. (车辆等的) 停放
With the develpment f science and technlgy, transprtatin in cities is imprving, but with the cnvenience it has brught us, sme ther prblems are cming ut. Hw can we change the situatin?
traffic jam
air pllutin
Can yu guess in which city the idea f “shared bikes” was brn?
Amsterdam 阿姆斯特丹the capital f Netherlands
Amsterdam is a city with cyclists. It has the highest prprtin f bicycles in the wrld — 14 millin bicycles amng 15 millin peple!
Fast-reading
A. The white bikes are backB. Bike-sharing is mre and mre ppular in the wrldC. Hw the white bikes beganD. The cnvenience and prblems f bikes in ChinaE. Hw the white bikes affect Amsterdam F. Amsterdam is a gd place fr cycling
Match the main idea f each paragraph.
Amsterdam is called "the City f Bicycles". Why is it a gd city fr cycling? Read the first paragraph and take ntes abut the reasns.
Why is Amsterdam a gd city fr cycling?________________________________________________________________________________________________________________________________________________________________________________________________________________________
It’s flat and therefre cnvenient fr bicyclesThere are plenty f places fr bicycles parking; Mst streets in the city centre have a bicycle 38% f all trips are made by bike
Where did the idea f “white bikes” start? What happened t it sn after, and what is the situatin nw? Read the rest f the text. Make ntes in the table.
Develpment f "White Bikes"
Peple in Amsterdam first had the idea fr “white bikes”. They wanted t reduce the amunt f traffic and pllutin in the city centre. They painted hundreds f white bikes and left them arund the city centre fr peple t use. Within a matter f weeks, the bikes had all been stlen and the prject came t an end.
“White bikes” returned t Amsterdam. This time every bike had a cmputer tracking system in it t make it pssible t recrd its mvements and yu had t use a special card t take a bike.
Bike-sharing is becming mre and mre ppular in cities arund the wrld, including Chinese cities.
Understanding Develpment f EventsThe develpment f events talks abut hw ne event fllwed anther t create a certain situatin.Find the starting pint f the events.Find ut when and where the events develped.Find ut what prblems develped and what the cnsequences f the develpment were.
Skill Builder
1 Why did cycling fans put frward the idea f “white bikes” in the 1960s?
Answer the fllwing questins based n yur ntes.
They were hpeful that this wuld help t save energy, reduce pllutin and prvide free public transprt.
2 What is the difference between the “white bikes” f the 1960s and f 1999?
3 What effects have “white bikes” had n Amsterdam?4 Why has the idea spread t ther parts f the wrld in recent years?
Peple can nw enjy clean air and easy transprt in central Amsterdam.
Because bike-sharing is a cheap and easy way t save energy, reduce air and nise pllutin, and enjy the benefits f exercises in cities.
Intrduce “white bikes” in Amsterdam with the help f the flw chart.
“White bikes” in the 1960spurpsesactinsresults
Influence in the wrld
Amsterdam: the City f Bicycles
The return f “white bikes” in 1999actinsresults
Act as museum guides t make the intrductin using the mind maps created in the last activity.
Student A: AmsterdamStudent B: in the 1960sStudent C: 1999Student D: nwadays
Imagine what the situatin will be like in ur city as far as bike-sharing is cncerned in 10 years frm nw? Hw can yur ideas be achieved? What fficial decisins need t be made? Hw peple will be infrmed?
Think and share.
1 What des the title “‘White Bikes’ n the Rad” mean?
“White bikes” n the rad refers t “white bikes” being used t ride arund the streets f a city. Apart frm the literal meaning, the title can als mean that the effrt t implement “White bikes” prjects takes time and it’s still n the way. There’s still aspects that need t be imprved.
2 What des the writer mean by saying “Where will bike-sharing g in China? Yu decide”?
Yung peple like the students will determine hw successful bike-sharing is in the future by deciding whether r nt and hw much they want t use it. It can als mean that whether r nt bike-sharing can exist successfully depends n each individual. Everyne has t take the respnsibility t take care f bike-sharing s that it can last lnger and help peple better.
Peple in Amsterdam have been 1____________________ cycling fr years. They are particularly lucky because the city is very flat and therefre 2____________ cycling. Back in the 1960s, a grup f cycling fans 3_____________ an idea f using free shared bikes. They believed that this wuld help t 4_____________, 5______________ and 6_________________________.
Cmplete the summary with the infrmatin yu have learnt.
enjying the benefits f
cnvenient fr
came up with
save energy
reduce pllutin
prvide free public transprt
Hwever, shrtly after setting up the new system, there was a serius prblem as all the bikes 7______________. In 1999, the bike-sharing idea returned t Amsterdam. This time they were 8_____________ a cmputer 9______________. 10______________ the effrts f many peple, the idea f “shared bikes” has nw pedalled its way arund the wrld.
disappeared
designed with
tracking system
What makes “white bikes” successful in Amsterdam?What factrs influence the develpment f bike-sharing?
What are the similarities and differences between “white bikes” in Amsterdam and shared bike in yur city/ twn?
Similarities:1. Peple use them fr shrt jurneys.2. There’s a cmputer tracking system t recrd their every mve.3. They’re painted in bright clurs.
1. disappear vi 消失；不见 disappearance n 消失；不见
Sn after, hwever, prblems came up and the “white bikes” all disappeared... (教材P37)然而不久就出现了问题，“白色自行车”全都消失了……
Fucs n Language: Imprtant wrds
① Many beautiful fish are fast disappearing because f the severe pllutin.因为污染严重，许多美丽的鱼类正在迅速消失。② He disappeared int the dark. 他消失在黑暗中。③ I watched her disappear frm my hrizn.我看着她从我的视线消失。④ The sun disappeared behind the cluds.太阳消失在云丛后面。
2. prvide vt 提供；供应
They were hpeful that this wuld help t save energy, reduce pllutin and prvide free public transprt. (教材P36)他们希望这样能够节约能源，减少污染并提供免费的公共交通。
① She prvided her father with all the fd and mney he wanted.她给她父亲提供他所需要的食物和钱。② He was very pr because he had t prvide fr five children.他很穷，因为他要抚养五个孩子。
1. cme up with 想出；想到
In the 1960s, a grup f cycling fans came up with an idea. (教材P36) 20世纪60年代，一群骑行爱好者提出了一个想法。
cme up 走近；上来；被提出 cme ut 出来；出版cme abut 发生；产生 when it cmes t... (t为介词) 当谈到…… cme acrss 遇见；(偶然) 发现cme t 苏醒；总计；达到
Fucs n Language: Imprtant phrases
① He came up with a really creative slutin t the prblem.他找到一个真正具有创造性的解决问题的方案。② Can yu tell me when it came abut?你能告诉我这是何时发生的吗？③ I came acrss my ld friend at the ffice yesterday.昨天在办公室，我偶然碰见了我的老朋友。④ When it cmes t making friends, yu cannt be t careful.一谈到交朋友，你再怎么小心也不为过。
2. thanks t 幸亏；由于；因为
Thanks t the ideas and effrts f many peple, like the cycling fans in the 1960s and thse wh enabled the return f “white bikes”, yu can nw enjy clean air and easy transprt in central Amsterdam. (教材P37)由于这个创意以及众多人的努力，如20世纪60年代的骑行爱好者和那些让 “白色自行车” 回归的人，现在人们可以在阿姆斯特丹的市中心享受清新的空气和便利的交通。
thanks fr 因……而感谢 thanks a lt 非常感谢；多谢many thanks 多谢，十分感谢① Thanks fr yur help.非常感谢您对我的帮助。② Many thanks fr yur invitatin.非常感谢你的邀请。③ Thanks a lt fr everything yu did fr me.非常感谢你为我做的一切。
1. Peple wuld leave the bike in the place where they finished their jurney, s that smene else culd then take it and use it frm there. (教材P37)人们在行程结束时就地停放自行车，以便其他人能继续使用。
Fucs n Language: Imprtant sentences
[句式解读] 句中s that引导目的状语从句，从句中含有情态动词culd。s that引导目的状语从句，意为 “以便，为了”，可用in rder that 替换，从句中常有may, can, culd等情态动词。
① I will leave s that yu can cncentrate n yur wrk.我这就走，以便让你专心工作。② He came in quietly s that he wuldn’t wake his wife up.他轻轻地进来，为了不把他的妻子吵醒。
③ I gt up early, s that I caught the first bus.我起得很早，所以赶上了第一班公共汽车。④ Suddenly it began t rain heavily, s that it was almst impssible t carry n driving.突然下起了大雨，几乎无法继续开车。
s that引导结果状语从句，意为 “因此，所以”，通常不与情态动词连用，从句前可用逗号与主句隔开。
2. T take a bicycle, yu had t put in a special card. (教材P37)要使用自行车，必须插入专用的卡片。
[句式解读] 句中t take a bicycle为不定式短语作目的状语。动词不定式作目的状语通常译为“为了……”，主要有以下三种结构形式：
① They wrked hard t get gd marks in the final exams.为了在期末考试中得到高分，他们很用功。② They tk exercise every day t keep healthy.他们为了保持健康每天运动。③ In rder t learn spken English well, he ften talks with American friends.为了学好口语他常常和美国朋友交谈。④ Lily saw many Chinese films s as t knw mre abut China.莉莉看了很多中国电影以便更多地了解中国。
Fcus n Grammar
一、在英文中，有许多“名词活用作动词”的现象。或者说，这些单词本身就有动词的意思，只是我们在学习这些单词的时候通常只接触了其名词的意思。
举个最简单的例子 “man” 这个单词，我们都知道是人、男人的意思，但它也可以作动词，有操作、配置人员、使增强勇气、拿出男子气概等意思。Yu need t man up and wn up t yur mistake.你要像个男人一样承认自己的错误。
二、熟练掌握这种名词和动词之间的转换具有非常重要的意义，对于我们英语水平的提高也至关重要。它的主要作用体现在：
1.让语言更加简洁比如说表示“我坐公共汽车去上班”这个意思，你可以说“I take a bus t wrk”也可以说“I bus t wrk”。当bus作动词时既包含了乘坐这个动作，又包含了所乘坐的交通工具，所以可以帮助省略不必要的take，让说话写作更加简洁明了。
2.使语言更加生动比如crner这个单词，名词意思是角落、墙角，动词的意思则有转弯、垄断、使为难等等。With this new technlgy, we are ging t crner the market within the next tw years.有了这项新科技，我们将在未来两年垄断市场。当crner这个单词作垄断意思解释的时候非常形象，想象一下一家公司把所有竞争者都逼到了墙角，这不就是垄断吗？还有个单词entrance，名词解释是入口，但当它作动词时就变成了使着迷、欣喜若狂。Her beauty entrances him. 她的美丽让他痴迷。
所以如果能做到名词的动词活用，可以使英文的语句更加具有画面感。
3．使语言更加地道比如用英文表达 “他著有两本畅销小说”。当然可以说“He has written tw best-selling nvels”，但这里的write让人感觉只是“写”，而没有“著”，所以会显得不够书面，不够地道。如果用authred来取代written就可以准确地表达出句子。英文单词中名词作动词的情形远远不止以上的例子。比如还有一组植物的名词，像花flwer、杂草weed、植物plant、种子seed、根rt等等都可以作动词使用，分别是成熟、除草、种植、播种、固定的意思。
随着人类社会的不断前进，语言也不断地向前发展，旧词少用，新词产生，语言变得越来越生动、形象，富于表现力和丰富多彩。人们常常用转化法、合成法、派生法等来创造新词。转化法: 就是词类转化，或叫词性转化，即利用某些词本身固有的特点，把原属于一类词性的词转化成另一种词类，即一种词类不经过任何词态变化而有意地作另一类词使用，同时又没有失去原有词内在的意思。
假设你是星光中学的李华，将参加主题为“Let’s Ride Bicycles” 的英语演讲比赛。请撰写一份演讲稿，主要内容包括：1. 目前汽车带来的空气污染和交通堵塞等问题；2. 骑自行车的益处，如节能环保、有利健康等。参考词汇：低碳生活 (lw carbn life)；节能 (energy saving)注意：1. 词数：120词左右；2. 演讲稿开头和结尾已给出，不计入总词数。
优点：带来方便, 重要交通方式
带来问题：空气污染、交通堵塞
参考词汇：cnvenienttraffic jamsave energy envirnmentally friendlybenefit / beneficial lw carbn lifeenergy-saving keep fit
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