2020届一轮复习人教版必修五Unit 3Life In the Future单元教案(33页word版)

2020届一轮复习人教版必修五Unit 3Life In the Future单元教案
Teaching Goals:
1.Predicting the good and bad changes in the future.
2.imagine the alien creatures.
Functions：
1.做出预测（Making predictions）
Do you suppose that…?
Suppose that…I wonder if…
Do you imagine that…? I imagine that…
2. 猜测未来（Making conjectures about future）
Is it likely/ unlikely that…Possibly …
It is possible that …Most likely …
I’m sure…Probably…
Suppose that …Perhaps …
Maybe …
Grammar:
1.过去分词作定语（The past participle as the attribute）
I followed him to collect a hovering carriage driven by computer. Tomorrow you will be ready for some visits organized by computer.
2.过去分词作状语（The past participle as the adverbial）
Worried about the journey, I was unsettled for the first few days. Confused by the new surroundings, I was hit by the lack of fresh air.
本单元以life in the future 为中心话题，旨在通过本单元的学习，让学生大胆发挥想象，对人类今后的生活环境，生活方式进行猜测，提倡环保生活意识，同时让学生学会过去分词作定语和作状语的不同用法，最后让学生将本单元所讨论的话题和推测手法结合，学习怎么样写report
本单元所涉及的要点有：
1.学习并了解未来生活的各个方面用与现在生活的不同之处，学习
外星人的生活方式。

2）学习表示预测，建议的句型。

（3）学习过去分词作定语和状语的结构。

（4）学习写好“report”,以训练学生的逻辑思维及写作能力.
Periods 1&2
Teaching Aims:
1. Learn some new words and expressions.
2. Help the students to talk about life in the past, at present and in the future.
3. Enable the students to describe the life in the past, at present and in the future.
Difficult and Important Points:
Compare life in the past, at present and in the future
What is life in the future like? What changes will take place?
Teaching Methods:
1. First and careful reading,
2. Asking and answering question activity
3. Individual, Pair work & group work
Teaching Procedures:
Step 1 warming up
Talk about how many changes there have been in the last one thousand years. And what changes we might expect to find in the next one thousand years
Step 2: pre-reading
1.Can you tell what problems people are facing today?
2.what problems do you think people in the future will have overcome? Which ones will still be there or even worse in AD3008?
Keys:
1The problem of population will be solved, have begun to Control the birth rate.
2The problems will be still there, and will even worse.
3I don’t think so. Now scientists are trying their best to develop new resources that human beings can make use of ,such as solar energy. In my opinion……
Step 3：Fast reading
Read the text for the first time and tell what the text is about?
It’s an e-mail written by a man who has taken up a trip to the future.
2. Look at the following sentence, there are in wrong order, tell me the correct order for these sentence
A. We were transported into the future by a comfortable time capsule.
B. I arrived at Wang Ping’s home and everything in his house made me surprised.
C.I won a travel to the year AD3008
D. I have my first try to master a hovering carriage.
Step 4 Careful reading
1.Why did I have the chance to travel to the year AD3008?
2. What is a “ time lag”?
3. How did I feel when I was in the capsule?
4. Who guides my trip?
5. Why did my guide give me some tables?
6. Who transported us to the future?
Keys:
1. I took up the prize I won the year before.
2. “Time lag” means a person gets flashbacks from his previous time period.
3. The seats in the capsule are very comfortable.
4. My friend Wang Ping is my guide to the future.
5. The tablets could help me feel less nervous and uncertain
6. Wang Ping’s parents’ company transported us to the future.
1How did I feel as soon as I was transported to the future?
After the writer was transported to the future, he was hit by the lack of fresh air.
2.how did Wang Ping solve this problem?
Wang Ping gave a mask to the writer and hurried him through to a small room nearby to have a rest.
3.what do you think has caused this kind of problem?
Now we are causing more and more pollution to the nature, this will cause serious problems to life in the nature. This may be the cause of the lack of fresh air in the future.
1 What did Wang Pang’s house look like?
His house is a large bright ,clean room. It had a green Wall, a brown floor and soft lighting .
2 What was the green wall made of? What’s the purpose of building this kind of green wall?
The green wall was made of trees. The leaves of the trees will provide much-needed oxygen to the house.
3 How can you produce a TV set in Wang Pang’s house?
You can just flash a switch on the computer screen and a TV set will rise from the floor.
Sample answers to Ex.2
I think the writer has an optimistic view of the future. He was very excited when he traveled to the year AD 3008 and couldn’t believe if was true. From this, we can see he is eager to go to the future. Though he was hit by the lack of fresh air,
The 3nd period
Teaching aims:
Learn expressions & phrases
Learn. language points
Difficult and Important Points:
1）Language points
2）The usage of “take up and sweep”
Teaching Methods:
Presentation & Practice
Teaching Procedures:
Step I Revision
Have a dictation
Step II. Check the answers
ch eck the answers of yesterday’s homework
Step three language point
1.FIRST IMPRESSIONS 第一印象
impression 印记；印象；感想；后接of sb./ of sth./ on sb./ that 从句；
知识拓展：impress v.给……留下深刻的印象；使铭记；使感动；常用结构有：impress sth. on/upon sib ./ impress sb. with sth .给……留下深刻的印象；使铭记；
做一做:
1）________________________________ was favourable.他给我的第一印象不错。

2) His trip to India made ____________________________________.他的印度之行对他的触动
3) He ____________________________his sincerity. 他的真诚打
2．I still cannot believe that I am taking up my prize that was won last year. 我仍然无法相信我是在接受去年获得的这个奖励。

take up 有这几个含义：
1）to start to do sth. 开始做（某项工作）；开始从事（工作）；
I have taken up teaching since I graduated from university.
我大学毕业后就从事教学工作。

2）to accept sth. that is offered or available 接受（建议或能得到的东西）
She took up his offer of a drink. 他请她喝一杯，她接受了。

另外还表示“占用空间和时间”
This table takes up too much room. 这张桌子太占地方了。

The work took up all his time. 那工作花费了他所有的时间。

做一做：
Helen always helps her mother even though going to school ______
most of her day. (广东)
A. takes up
B. makes up
C. saves up
D. puts up
3.I have to remind myself constantly that I am really in AD 3008.
我不得不一直不断地提醒自己已到了公元3008年。

1)remind v.提醒；使想起；常用结构有: remind sb. to do sth.提醒
某人做某事；remind sb.＋(that)/wh-从句提醒某人……；使某人想
起……；remind sb. about/of sth. 使某人想起或意识到……；提醒某
人某事
He reminded the children to wash their hands. 他提醒孩子们
去洗手。

This song
reminds me of my childhood. 这首歌曲使我想起了我的孩提时代。

The doctor reminds me that I should see her again in two months.
医生提醒我两个月后应该再去看她。

做一做：
①1You _________me ______your father when you say that.
你说这样的话使我想起了你的父亲。

②Remind me ________ __________Alan before I go out.
提醒我在出去之前给艾伦打电话。

知识拓展：reminder n.提醒物；引起回忆的事物
2)constantly adv.始终；一直；重复不断地
Fashion is constantly changing.时尚总是日新月异。

知识拓展：constant adj.连续发生的；不断的；重复的；
4. Worried about the journey, I was unsettled for the first few days.因为担心旅程，开始的头几天我很不安。

此处Worried about the journey的作用相当于一个原因状语从句As I was worried about the journey,在句中作状语
5. This is similar to the “jet lag” you get from flying, but it seems you keep getting flashbacks from your previous time period.这种病有些像乘喷气式飞机高速飞行时所引起的时差反应那样，所不同的是，它意味着你的脑海里不停地从以前的时间段一直往回闪去。

1）be similar to 与……相似
be the same as 与……相同
be different from 与……不同
2）you get是定语从句，修饰the “jet lag”, 省略了关系代词which/that(作get的宾语)；when flying是省略句，省略了主语you和谓语动词的一部分were；instead位于句首或句末，作状语，引出与上文不同的内容。

3) jet lag指喷气式飞行时差综合症，即乘飞机跨越时区时，人体的生物钟或昼夜生理节律仍然停留在原时区的状态，从而与新时区不同步。

flashback往事；往回闪现。

4) previous adj.先前的；以往的；（时间上）稍前的
No previous experience is necessary for this job.
这一工作无需相关的经验。

I couldn't believe it when I heard the news. I had only seen him the previous day.
听到这个消息时，我不敢相信；我就在前一天还见到过他。

知识拓展：previously adv. 先前的；早先
The building had previously been used as a hotel.
这座楼房早先曾用作旅馆。

6. Well-known for their expertise, his parents’ company. called “Future Tours” ,transported me safely into the future in a time capsule.他父母的“Future Tours”公司技能精湛，用时间太空舱安全地把我运送到未来。

1) Well-known for their expertise表原因，相当于一个原因状语从句，表示他父母的“Future Tours”公司能够把我运送到未来的原因
2) named “Future Tours”是过去分词作定语，相当于定语从句that was named “Future Tours”
7. Hit by the lack of fresh air, …缺乏新鲜空气我感觉受不了。

1) lack 用作名词表示：“缺乏；短缺”；用作动词表示：“缺乏；短缺；没有；不足”。

a lack of food /money/skills 缺乏食物/金钱/技能
做一做:
①The trip was cancelled through___________________________.
因为缺乏兴趣这次旅行被取消了。

②He ____________________________.
知识拓展：lacking adj. 缺乏；没有；匮乏；不足
2）surroundings n.[pl.] 环境；surround v. 围绕；环绕；
surrounding adj.周围的；附近的
Everyone likes to work in pleasant surroundings.
人人都喜欢在愉快的环境中工作。

8. Soon I was back on my feet again and following him to collect
a hovering carriage driven by computer. 很快我又重新振作起来，跟随他领取了一部由电脑控制的气垫车.
1）back on one's feet 经受打击后重新站起来，再次恢复了健康2）driven by computer在句中作定语,相当于which was driven by
computer；
过去分词短语作定语通常放在被修饰的词后面，相当于一个定语从句：
The suggestion made by the foreign expert was adopted by the manager.
外国专家所提出的建议被经理采纳了。

9．These hovering carriages float above the ground and by bending or pressing down in your seat.
1）by+ doing 用某种方式或手段, 如, They put out the fire by pouring water on it. 他们泼水扑灭了火；句中by bending and pressing down on the driving stick strongly修饰move swiftly,表示使气垫车“迅速地移动”的手段；driving stick中的driving为动名词作定语，表示用途，如：a sleeping car 用来睡觉的车（卧铺车）；one在句中泛指人。

2）bend 弯曲；使弯曲；弯腰；弯身；常用搭配有: bend one's mind/efforts to sth. 致力于某事；bend sb.to sth. 迫使；说服bend the truth 歪曲事实
It's hard to bend an iron bar. 把铁棒弄弯很不容易。

做一做:
①She _____________________and kissed her daughter.
她低下头吻了她的女儿。

②The road_________ sharply__________________. 路向右急转弯。

3) press v. 压；按；推；挤；坚持；敦促n.报章杂志，新闻工作者，新闻界
做一做:
①She ______ _________hard _____the gas pedal.
②He is still _________her claim_______ compensation(赔偿).
他仍坚持索赔。

③______ _________was/were not allowed to attend the trial(审判).
4）by后接动名词，常作状语，修饰谓语或某个动作，表示其行为的方式或手段。

做一做:
He made his boss pleased________________________________.
10．However, I lost sight of Wang Ping when we …王平不见了。

lose sight of 看不见, 忘记, 失去其反义词组catch sight of
sth/sb 看见某人/物
另外, at first sight 一见就；乍看起来；at (the) sight of 一看见
就……; out of sight 看不见：Out of sight, out of mind. 眼不见,心不念。

be in sight 看得见，在眼前；
做一做:
1）We___________________ several precious animals. 我们失去了很多的珍惜动物
2）乍看起来，这个问题好像容易。

__________________________________________________.
3）小岛仍然可以看的见。

_____________________________________.
4）一看见老师男孩就跑掉。

________________________________________________.
11．He was swept up into the centre of them .他被卷入到这群车队当中去了，
sweep up打扫，横扫；涌向；快速地抱起
She was left to sweep up after the party.
聚会结束后她被留下来打扫。

做一做:
1) He ________________________into his arms.
他一把将孩子抱进怀里。

2)In pushing to the train, the children ___________the crowds of people.
A. sweeping up into
B. swept up into
C. were swept up
D. were swept up into
12．Just at that moment I had a “time lag” flashback and saw the area again as it had been in the year AD 2008.就在那一时刻，我得了时间滞后症，在我脑海里，这个地方又闪回到公元2008年。

1) time lag指乘坐时间太空舱穿梭未来时由于速度极快而产生的“时间滞后症”，与jet lag喷气式飞行时差综合症，即乘飞机跨越时区时人体的生物钟或昼夜生理节律仍然停留在原时区的状态类似。

2) as it had been in the year AD 2005 是方式状语从句,修饰主句I saw the area again ;
as it had been 是由as it be变来的，as it be表示“按照原状, 照旧, 像…”
The situation is as it was before.形势还是原来那样.
13. Then Wang Ping flashed a switch on a computer screen, and
a table and chairs rose from under the floor as if by magic. 王平闪了一下电脑屏幕上的开关，于是一张桌子和几把椅子就像魔术般地从地面升了起来。

1）本句有两个句子并列，前两者之间用逗号隔开最后两者之间用and连接；
2) 后面的一个分句使用了倒装句，主要是为避免头重脚轻，使句
子平衡，同时也可使前后联系得更加紧密，正常语序是a
switch on a computer screen flashed；
3) 此处as if 引导的是一个省略的方式状语从句，其完整句子是
as if a table and chairs rose from under the floor by magic 4）switch 用作名词表示“开关；转换”。

用作动词表示“转换，改变”。

She made the switch from full-time to part-time work when her first child was born.。

第一个孩子出生后，她就由全日工作改为非全日工作。

Press these two keys to switch between documents on screen.
按这两个键就可以在屏幕上的文件之间进行切换。

I can't work next week, will you switch with me?
下个周末我不能上班，咱俩换个班好不好？
14．Exhausted, I slid into bed and fell fast asleep. 由于太累了，我倒在床上马上就睡
着了。

exhausted表原因，相当于一个原因状语从句As I was exhausted；fell fast asleep 酣睡。

fast或sound常与fall asleep 搭配表示睡的程度深。

做一做:
1) ______________, the children ___________ __________at once.
由于太累了，孩子们马上就睡着了。

2) 太激动了，这位老人一句话也说不出来。

______________________________________________________ _.
Learning about Language
15. speed (sth.) up 加速；加快
Cars speed up once they reach the highway.
汽车一到高速公路就加速。

They have speeded up production.
他们加快了生产速度。

Homework
Do exercises on page20 and Page 56 in the book
The 4th period
Teaching Aims:
Teach grammar (The Past Participle as the adverbial and attribute) Improve the students’ listening skills.
Difficult and Important Points:
1)Learn the grammar(The Past Participle as the Predicative & Attribute)
2)Have the Ss sum up the function of the past participle using inductive method.
Teaching Methods:
1.Inductive Method
2.Group work
Teaching Procedures:
Step I Dictation
Step II. Grammar
Grammar
past participle used as adverbial and attribute
Complete the following sentences with the words given, using their proper forms.
1, I like reading the novels______ (write) by him
2. The girl ________(write) a letter is my cousin
3. There is something wrong with my bike and I have to get it
__________(repair).
4.He spoke loudly in order to make himself ____ (hear)
Sentence patterns
Worried about the journey, I was unsettled for the first few days
As I was worried about the journey, I was unsettled for the first few days
Well known for their expertise, his parents’ company named “future tours” transported me safely into the future in a time capsule.
His parents’ company was well known for their expertise …
3.Confused by the new surroundings, I was hit by the lack of fresh air When I was confused by the new surrounding, I was…
Arriving home, he showed me into a large bright, clean room.
When he is arriving home, he showed me into…
Exhausted, I slid into bed and fell fast asleep
As I was exhausted, I slid into bed and fell fast asleep.
过去分词作状语，意义上相当于状语从句，表示时间，条件，原因，伴随状况等
Whenever praised, he blushed
United, we stand, divided, we fall
Written in a hurry, the book is full of errors
Although born in Germany, John lives and works in U.S.A
PAGE 21, EX 2
1. Frightened by the loud noise, I went to see what was happening.
2. Hit by the lack of fresh air, he got a bad headache,
3. Tired after the long journey, I still enjoyed meeting the aliens on the space station
4. Frightened by the noise outside, the little girl dared not sleep in her
bedroom.
5. Built in 1910, the museum is almost 100 years old.
6. Given some advice by the famous scientist, the student was not worried about his scientific experiment any more.
Pick out two more sentences from the reading with pp used as the attribute.
1. His parent’s company named “future tours” transported me safely into the future in a time capsule.
2. Tomorrow you will be ready for some visits organized by the company
3. He became inspired when he thought about helping ordinary people exposed to cholera.
Ex 3
1.Soon we lost sight of that famous astronomer called Li Qiang
2.I am going to buy a painting copied from Vincent van Gogh
3.I like that old private house built of wood and mud
4.The room connected to the rest of the house by a long passage is completely empty
5. The queen was sitting in a royal carriage drawn by four horses.
6. The vehicle mentioned in the book is unknown to me
7. The castle built in 1432 is under repair
Homework
Finish the grammar exercises in the book and ELL papers.
The 5th Period
Teaching Aims:
Improve the students reading skills.
Learn something about“I have seem amazing things”Difficult and Important Points:
1)Reading Comprehension
2) write a report
Teaching Methods:
Comparative method
Teaching Procedures:
Step1 extensive reading
Step2 group work
Create a new alien and fill in the blanks then draw it out
With your partner, draw a picture of your alien.
Then write a description based on your drawing and the notes in the chart. Step 3 extensive reading 2 Rising to a challenge
Paragraph 1
Silver adventure:
Advantages:
Paragraph 2:
Problem existed in the
past:______________________________________________
___________________________________________________________ _________
Now solved
by________________________________________________________ ___________________________________________________________ _________
What can Saturation City provide?
Paragraph 3:_________________
Paragraph 4:_________________
Paragraph 5:_________________
The 6th Period
Teaching procedures
Step 1 Revision
1 Check the homework exercises.
2 Ask the Ss a few random questions to revise future time and introduce the topic of the unit. For example: What lessons do you have this afternoon / tomorrow? Are you going to do anything special this evening? What do you think the weather will be like tomorrow? What are you going to do on Saturday evening? Are you planning to do anything on Sunday?
Step 2 Presentation
S. Ask questions about the picture (in PPT.), and get Ss to tell you what they think is happening. Teach the new words majority, goods, industry. Read the introduction aloud.
Step 3 Reading
Say Now read the dialogue silently and find out this information: What is being planned at this company? Allow the Ss a few moments to carry out the task. Check the answer. (A new factory may be built.) See if the Ss can guess the meaning of out of work.
Step 4 Dialogue
Play the tape of the dialogue for the Ss to listen and follow. Go through the dialogue briefly and make sure the Ss understand it. Ask questions
like these: What are people at the company talking about? Who is going
to make the decision? Why does the company need to build a new factory? What is the difficulty? Why do some people want the new factory to be
built? Why are some people against the new factory? Explain that may have plans expresses uncertainty about the future. Play the tape again. This time the Ss listen and repeat. Then let the Ss practice the dialogue in pairs. You may wish to ask one pair to act the scene in front of the class. Notes:
a People have been talking of it a lot recently.:
Note the Present Perfect Continuous Tense to express an activity which started in the past and is still continuing.
b I simply don‘t know. = I honestly don’t know.
c Right now = At this moment
d Th
e problem is … it. = Finding land for building the new factory is a problem ( i.e. difficult).
e The majority o
f people = Most people
f a number of people = quite a lot of people
g out of work = do not have jobs
h But some people … built on. = Some people do not want them to build a factory on good farm land. Note the structure not want something to be done.
i I can see the problem. = I understand the problem.
j is likely to happen = will probably happen
k It‘s quite likely: Quite emphasizes lik ely and increases the possibility. Step 5 Practice
Demonstrate how to make sentences from the table, and then get a few Ss to make example sentences. Then let the Ss do this exercise in pairs. At the end get Ss to write down 5 sentences from this table in their exercise books.
Step 6 Workbook
After Ex. 1 is done orally, get the Ss to write the answers in their exercise books.
Both Exx. 2 and 3 should be done in pairs first. Then check the answers with the class. Get Ss to translate the sentences into Chinese and ask them to think if they will be able to put them back into English. Pay attention to the sentence structures.
When doing Ex. 4, warn the Ss not to do word for word translation. Special attention should be paid to the sentence patterns and word order. Step 7 Consolidation
With a good class you can give the Ss the following phrases and get them to make up a dialogue. Write these phrases on the Bb.
I believe you’re right.
What are the problems then?
What do you think is likely to happen?
Write them up on the Bb and demonstrate with a good S how it is possible to make up a dialogue.
A: I think the company will buy more land.
B: I believe you‘re right.
A: But it isn’t likely that the manager will make a decision soon.
B: What are the problems then?
With an ordinary class, just practice the dialogue in Part 1 again. Homework
Finish off the Workbook exercises.
2. I still cannot believe that I am taking up this prize that I won last year. 我还是无法相信我是在接受去年赢得的这个奖励。

关键透析
take up 在此句中意为“接受”。

用法归纳
(1)占据时间、空间
Reading this novel took up most of my spare time.
读这部小说占去了我大部分空闲时间。

(2)开始从事
My father took up football when he was only ten years old.
十岁时，父亲开始踢球。

(3)拿起、举起
He took up his book and hurried out.
他拿起书匆忙出去了。

(4)欣然接受
She took up his offer of a meal.
他请她吃饭，她接受了。

即时活用
After studying in a medical college for five years，Jane___ her job as a doctor in the countryside.
A. set out
B. took over
C. took up
D. set up
3. The air seemed thin, as though its combination of gases had little oxygen left.
空气似乎很稀薄，似乎它的混合气体中剩下的氧气很少。

关键透析
as though引导方式状语从句，意为“似乎、好像”。

如：We felt as though we had witnessed the whole thing. 我们感到仿佛目击了整个这件事似的。

用法归纳
as though(=)as if
(1)引导方式状语从句
The old machine operates as if it were a new one.
这台旧机器操作起来就像新的一样。

(2)引导表语从句
It looks as if it is going to rain.
天似乎要下雨。

(3)as if后可接to do
He raised his hand as though to say something.
他举起手好像要说什么。

即时活用
Allen remembers everything exactly as if it ___ yesterday.
A. was happening
B. happens
C. has happened
D. happened
特别提示
从属连词as if，as though多表示一种假设，因此从句中的谓语动词常用虚拟语气。

He treats me as though I were a stranger.
他待我犹如陌生人。

4. Just at that moment I had a “time lag” flashback and saw the area again as it had been in the year AD 2008.
就是在那时，我有了一次“时间逆转”的闪回，再次看到了公元2008年时的那的地区。

关键透析
as it had been in the year AD 2008，为定于从句，修饰先行词area。

用法归纳
as作连词引导从句：
(1)引导定语从句
As we all know, the earth travels around the sun.
众所周之，地球绕着太阳转。

(2)引导让步状语从句
Boy as he is, he knows so much about the world.
尽管他是个小孩，但他通晓很多事情。

(3)引导方式状语
She stayed in bed as the doctor had ordered.
她依照医生的吩咐卧床休息。

(4)引导时间状语从句
As time went by, we knew more and more about ourselves.
随着时间的退移，我们对自己的了解越来越深。

As I was getting on the bus, someone called me.
我上公共汽车时，有人叫我。

即时活用
---Who should be responsible for the accident?
---The boss, not the workers. They just carried out the order___.
A. as told
B. as are told
C. as telling
D. as they told
特别提示
as引导的让步状语从句，需要倒装。

这是高考命题中的一个重点和热点。

Child as he was, he knew what was the right thing to do. 尽管他是个孩子，他却懂得应该做什么。

(Child前无冠词)
5. At first my new surroundings were difficult to tolerate.
开始时新的环境让我很难忍受。

关键透析
to tolerate是不定式短语，作方面状语，其逻辑宾语是my new surroundings. 如：The air on mars is hard to breathe. 火星上的空气难
以呼吸。

用法归纳
tolerate
(1)容许、允许
This kind of behaviour will not be tolerated.
这种行为是不能被容许的。

(2)忍受、容忍(bear=put up with=stand)
I don’t know how you tolerate that noise.
我不知道你怎么能忍受那样的噪音。

(3)耐得住、经受住
Few plants will tolerate sudden changes in temperature.
少数的植物能经受住温度的突然变化。

联想拓展
(1)toleration n. 宽容、容忍
(2)tolerance n. 忍受、容忍
(3)tolerant adj. 容忍的
6. I found later that their provided the room with much-needed oxygen. Then Wang Ping flashed a switch on a computer screen, and a table and some chairs rose from under the floor as if by magic.
后来我才发现，就是这些树的叶子为这栋房子提供了最急需的氧气。

然后王平使电脑屏幕上的一个开关闪了一下，于是一张桌子和几把椅子就像变魔术那样从地板下面升了上来。

switch n.开关如：You pressed the wrong switch. 你按错了开关。

联想拓展
switch
(1)Turn on/off the switch 打开/关掉开关
(2)the switch in …在……方面的转变
(3)switch off=turn off 关掉(电灯或电器)
(4)switch on=turn on打开(电灯或电器)
(5)switch from A to B 由A转变为B
即时活用
(1) Derek, I wish you'd keep that radio ___ ___.
德里克, 我希望你把收音机关了。

(2) ___ ___ the recorder, please.
请打开录音机。

(3) Duval could ___ easily ___ French ___ English.
杜瓦尔可以转很容易从法语译成英语。

(4) There's been a ___ ___ our plans.
我们的计划改变了。