人教版高中英语配套ppt课件：选修8 unit 1 A land of diversity period 1（共87张PPT）

课件87张PPT。 Why American Culture is Unique
American culture is unique because it is nurtured, formed and developed under certain conditions, which are characteristically(特性)American. The major factors contributing to the making of this new nation and the forming of a new culture are the hard environment, ethnic diversity(多民族) and plural religion, which is quite different from other
Unit 1 A land of diversitynations in the world. ①What is more, these elements are still influencing the American culture.
The early immigrants who were English Puritans settled down in northeast part of America. The environment there was very rough but they believed the poor land could purify their mind so they chose the place along the coast. From 1607 to 1892, frontiers were pushed further west. The American frontier consisted of the relatively unsettled regions of the United States, usually found in the western part of the country. The frontiersmen looked for a land of rich resources and a land of promise, opportunity and freedom. Actually they looked for a better life. So individualism, self－reliance, and equality of opportunity have perhaps been the values most closely associated with the frontier heritage(遗产) of American.
The population of the United States includes ②a large variety of ethnic groups coming from many races, nationalities, and religions. People ③refer to the United States as “melting pot ”and the dominant people are British. American is made up of WASP＋MM, that is, White, Anglo Saxon, Protestants plus Middle Class and Male. In history, people from different countries in the world rushed to American three times. They brought their own culture to American and later on different cultures were mixed together. Thus the unique American culture is formed, a common cultural life with commonly shared values.
The fundamental American belief in individual freedom and the right of individuals to practice their own religion is at the center of religious experience in the United States. The great diversity of ethnic backgrounds has produced religious pluralism; almost all of the religions of the world are now practiced in the United States. Christianity(基督教) is the dominant religion in American and Protestant (新教)is predominate(主导). Any individuals are equal before God and they believe they can communicate directly to God so they can share the same idea. Under the protestant, many new ones are formed and different explanations produce different sect of religion. Churches are independent and American religion isno longer religion seculars. The institution permits the practice of religion and the political power is separate from religion. So there are more religions in American than in other countries.
From the facts above, we can see American culture is unique which was cultivated, formed and developed by the main three factors, rough environment, ethnic diversity and plural religion and still is affected and determined by them now.
Ⅰ. 阅读短文，判断正(T)误(F)
1．The major factors contributing to the making of this
new nation and the forming of a new culture are the
hard environment，ethnic diversity and multiple
religion. (　　)
2．The rough environment is the direct cause of the
American culture. (　　)
3．We can infer that religious beliefs are respected by the
law. (　　)
答案　1.T　2.F　3.T
Ⅱ. 佳句仿写
1．他是一位渊博的学者，而且是一位优秀的教师。
He is a good scholar, and________ ________ ________， a good teacher.
2．社会是由形形色色的人组成。有些人很好，有些人很坏，也有些人介乎两者之间。
Society is made up of________ ________ ________
people; some are good, others (are) bad, and still others (are) in between.
Many postings are expressions of love and thanks. Some________ ________Wen jia bao as premier, others________“Grandpa Wen.”
答案　1.what is more　2.a variety of　3.refer to；as
3．很多帖子表达了热爱和感激之情，一些人把温家宝称作“总
理”，有些人把他称作“温爷爷”。Ⅰ.单词识记
1．________v. to choose someone for an official position by voting
2．________n. a quick increase of business activity
3．________adj. clearly different or belonging to a different type
Period 1 Warming Up,Pre-reading & Reading4．________n. most of the people or things in a group
5．________adj. relating to the various races that humans can be divided into
6．________n. an amount expressed as if it is part of a total which is 100
7．________adj. relating to the central government of a country such as the US, rather than the government of one of its states
8．________n. one of the two long metal tracks fastened to the ground that trains move along
9．________n. a government department that is responsible for one of the areas of government work, such as education or health
10．________n. something that makes your life difficult or unpleasant
答案　1. elect　2.boom　3.distinct　4.majority　5.racial
6．percentage　7.federal　8.rail　9.ministry 10.hardship
Ⅱ.短语天地
1．____________习惯于新的生活方式、工作等
2．____________此外；另外
3．____________继续存在；继续生存；靠……生活；以……为主食
4．____________坚持；维持；沿袭(风俗、传统等)
5．____________用……方法；借助……
6．declare war on/upon____________
7．die from____________
8．by the time____________
9．fight against____________
10．the majority of____________
答案　1.make a life　2.in addition　3. live on　4. keep up
5．by means of　6.对……宣战　7. 因……致死；由于……而死　8.到……时候为止　9.与……作斗争　10.大多数
[信息提取]　It's likely that...“可能……”。
[例句仿写]　她的生日宴会很有可能在九月份举行。
________highly________ ________her birthday party will be held in September.
Ⅲ. 句型搜索
1．However, it is likely that Native Americans were living in
California at least fifteen thousand years ago.
[信息提取]　That is why...，“那就是……的原因”，why引导表语从句。
[例句仿写] 　这就是为什么开发工程师一定要非常小心的原因。
________ ________ ________the development engineers need to be very careful.
2．That is why today over 40% of Californians speak Spanish
as a first or second language.
[信息提取]　It is/was believed that...“人们认为，据认为……”。
[例句仿写] 　据认为，他此行得到很大的收获。
________ ________ ________ ________he gained a lot of profits from his visit.
答案　1.It's；likely that　2.That is why　3.It was believed that
3．It is believed that before long the mix of nationalities will be so great that there will be no distinct major racial or cultural groups, but simply a mixture of many races and cultures.
A．Because there were many Spanish staying in
California.
B．Because Spanish was one of the settlers living there.
C．Because the local people loved Spanish culture.
D．Because California was once ruled by Spain.
Ⅳ. 预读理解
1．Fast Reading: Scan the text and choose the best answers
according to the text. (1) Why is there strong Spanish influence in California?
A．Mexico gained independence from Spain.
B．Mexico lost the America-Mexico war and then gave it to
the USA.
C．Spain lost the Spain-America war.
D．Spain gave it to the USA as a gift.
A．A lot of people became rich in the gold rush.
B．Some people died in the gold rush.
C．After the gold rush, most people settled in California
although they did not find gold.
D．The first to arrive in California for gold were South
Americans and people from America.
(2) How did California become a state of America?(3) Which of the following statements is NOT true?
A．For gold.
B．For the building of the railway.
C．To open restaurants.
D．To live in the Chinatown.
A．Gold was discovered here.
B．It has attractive climate and lifestyle.
C．Many people came here to make a fortune.
D．All of the above.
答案　(1)D　(2)B　(3)A　(4)B　(5)D
(4)What's the main reason that Chinese immigrants came to
California?(5) Why has California attracted so many people?2．Careful Reading: Read the text carefully and finish the chart
below.
答案　(1)1800s　(2)1860s　(3)early1900s　(4)1911
(5)by the 1920s　(6)late 1800s　(7)1942－1945　(8)1970s　(9)Worked in Computer industry　(10)Recent decades

(1)差别；区别
Employers should hire men and women without distinction.雇主用人应不分男女。
We should make a distinction between right and wrong.
我们应该分清是非。
(2)荣誉(称号)；优异成绩
She passed all tests with distinction.
她以优异的成绩通过所有的考试。1．distinction n. He has the distinction of being very generous to those in need.
他得到了荣誉，因为他对那些需要帮助的人慷慨解囊。
(1)without distinction 无差别(无差异地)
with distinction 以优异的成绩；以杰出的表现
make a distinction 区分开来，区别对待
(2)distinct adj. 不同的，各异的；明显的，清楚的
distinctive adj. 与众不同的
distinctly adv. 清楚地；明白地；明显地
distinguish v. 区分；辨别；把……区别分类；使杰出Management had interests quite distinct from those of their employees.
管理层的利益和他们员工的利益完全不同。
There is a distinct smell of oranges in this room!
这个房间里有明显的桔子味！
The twins were so much alike that it was impossible to distinguish one from the other.
这对孪生子像得使人无法分辨。
【完成句子】
①Children are often not taught to________ ________
________．
孩子们通常也不被教育去加以区分。
②He________ ________ ________in his music exam.
他在音乐考试中获得了荣誉称号(或奖章)。
③Gold________ ________ ________iron.
黄金与铁截然不同。
答案　①make a distinction　②had a distinction　③is distinct from
All means have been tried out to help that poor girl.
为了帮助那个可怜的女孩儿，所有办法都试过了。
The quickest means of travel is by plane.
最快的交通工具是飞机。
The news media remains the primary means of communication with the public.
新闻媒体仍然是与大众交流的主要手段。
2．means n．方式，方法；途径(单复数同形)by means of　　　　借助于；利用；以……方法
by all means 无论如何；当然可以；没问题
by any means 无论如何；想尽办法
by no means 决不，绝非
by this means 通过这种方式
by every means 用一切办法I think she is right by all means.
不管怎么说，我想她是对的。
By no means will China first use nuclear weapons.
中国决不会首先使用核武器。
Only by this means can we master English.
只要用这种方法我们才能精通英语。
【感悟高考】
—Can I come and have a look at your new house?
—Yes，________． (2011·浙江，17)
A．with pleasure B．I like it
C．I quite agree D．by all means
解析　考查交际用语。句意：——我可以来看看你的新房子吗？——可以，当然可以。A项：非常乐意；B项：我喜欢；C项：我同意；D项：无论如何，当然行。
答案　D
【比较网站】　 manner/method/way/means/approach
这些名词均含“方法、方式”之意。
He finished off the story in his usual manner.
他还像往常那样结束了这个故事。
This is not an economical method of heating.
这不是一种经济的取暖方式。
The work must be finished in one way or another.
这件事必须设法做好。
Her approach to the job lacks purpose.
她干这项工作缺乏毅力。
【温馨提示】
【完成句子】
①They succeeded________ ________ ________hard working.
他们依靠努力工作而获得成功。
②We should________ ________ ________develop our industry wherever possible.
无论什么地方，只要有可能我们就应该想方设法发展工业。
③Only________ ________ ________can you solve the problem.
只有通过这种手段你才能解决这个问题。
④It is________ ________ ________easy to satisfy everyone.
要满足每一个人绝非易事。
选用manner/method/way/means/approach的适当形式填空
⑤We walked in a leisurely________， looking in all the
windows.
我们慢悠悠地走着，看遍所有的橱窗。
⑥The professor introduced a new________to learning
English words.
这位教授介绍了一种学习英语单词的新方法。
答案　①by means of　②by every means　③by this means/in this way　④by no means　⑤manner　
⑥approach
(1)the majority单独使用作主语时，谓语动词用单数或复数皆可。
The majority were on Syrian people's side.
大多数人都站在叙利亚人民的一边。
The majority were/was against the plan.
大多数人反对这个计划。
(2)the majority of后接复数名词，谓语动词用复数；后接不可数名词，谓语动词用单数。
The majority of people seem to prefer Internet to TV.
多数人喜欢网络胜过电视。
The majority of economists remain relaxed about the3．majority n. 多数，大多数inflationary risks China is facing. 对中国面临的通胀风险，大多数经济学家仍持轻松的态度。
The majority of the damage is easy to repair.
这次的损害大部分容易补救。
(1)the majority of　　　 大多数的
by/with a majority of 以大多数……赢得……
narrow majority 微弱多数
be in a/the majority 占多数；过半数
(2)major adj. 较大的；较多的；主要的 vi.主 修 n．主修课
major in 主修The new president got in with a large majority of the votes.
新任总统以大部分选票当选。
As the bill failed to be passed with a majority of votes, they decided to lay it on the table.由于大多数人没有投票支持那项法案，他们决定把它暂时搁置起来。
He majored in international commerce in college.
他大学时的专业是国际贸易。
【完成句子】
①He won by a________of 45，000 votes.
他获得了45，000张选票，以多数胜出。
②The________of citizens were unhappy with the new law.
绝大多数市民都对新法案不满。
③He________in English and I, in French.
他主修英语，我主修法语。
答案　①majority　②majority　③majors
The little boy elects to be a volunteer in the future.
这个小男孩决定将来当一名志愿者。
Increasing numbers of people elect to work from home nowadays.
现在越来越多的人选择在家工作。
After three rounds of voting, Jack was finally elected president of the school's Student Union.
经过三轮投票，杰克终于被选为校学生会主席。
4．elect vt.选择；决定做某事；选举某人(1)elect to do sth　　　　　决定/选择干某事
elect sb to do sth 选某人干某事
elect sb (to be/as)＋职务 选某人为
(2)election n. 选举We elected him chairman of the board.
我们选举他担任董事会主席。
I may vote for her at the next election.
下届选举我可能选她。
【完成句子】
①All the students________ ________ ________ ________of
our class.
所有的学生都选举汤姆作为我们班的班长。
②She________ ________ ________to work after her baby
was born.
她决定孩子出生后再回到工作岗位。
答案　①elected Tom as monitor 　②elected to return
Whisky contains a large percentage of alcohol.
威士忌所含酒精的百分比很高。
We have only a small percentage of foreign books.
我们只有一少部分外文书。
【温馨提示】
5．percentage n．百分比率，比率；部分A large percentage of high school students wear glasses.
中学生中有相当高比率的人戴眼镜。
A large percentage of the town's income is from the visitors to the lake nearby.
那个小镇的收入大部分来源于游览附近那个湖的游客。
The percentage of cancer patients keeps rising.
癌症病人的百分比在不断上升。
【比较网站】　percentage/percent
—What percentage of students were/was absent?
——学生缺席的比例是多少？
—Twenty percent.——百分之二十。
【图解助记】
percentage　　　　　　　　percent【完成句子】
①What________of children________absent?
缺席的孩子占百分之几？
②The company's market share is 48________in the
marketplace.
这家公司的市场占有率是百分之四十八。
答案　①percentage；were　②percent
The county boomed when gold was discovered there.
那个县在发现了黄金后便繁荣起来。
The economy reform boomed many new cities.
经济改革使许多新城市兴旺发达起来。
The oil market is enjoying a boom these years.
这几年石油市场欣欣向荣。
Greece indeed had a boom after it joined the eurozone in 2001.
希腊确实在2001年加入欧元区后才有一个繁荣期。
6．boom vi.处于经济迅速发展时期 n．(人口、贸易的)繁荣Baby boom　　　　　　 生育高峰期
economic boom 经济繁荣
boom town 新兴城市
boom years/times 繁荣时期It achieved an unbelievable economic boom after the war.
但战后它却成就了令人难以置信的经济繁荣。
Huawei, based in the southern Chinese boom town of Shenzhen, considers Europe a key battleground in its international expansion.总部位于繁华都市深圳的华威认为欧洲是其国际扩张中的一个关键战场。
These are boom years/times for voluntary organizations.
这是志愿组织兴起的时期。
【完成句子】
①Business________ ________since I enlarged the shop.
自从我扩大商店以来，生意日趋兴隆。
②________ ________ ________followed, especially in
housing and construction.
接下来出现了经济繁荣，特别是在房产和建筑方面。
答案　①is booming　②An economic boom
(1)继续存在；继续生存
He is ninety, and is likely to live on.
他九十岁了，看来还能活下去。
(2)靠……生活；以……为主食
His family has lived on government aid for three years.
他一家靠政府救济生活三年了。
Being an adult, how can I still live on the financial support of my family?
我都成年了，怎么还好意思靠家里贴补过日子？
1. live on/uponlive by　　　　　 靠……(手段、方式)生活
live a．..life 过着……的生活
live up to 符合；不辜负
live out 实践……；度过……He tried to live by writing, but it did not provide a good enough income.
他试图以写作为生，但写作的收入实在不够。
In order that my child can live a better life, I have to work more. 为了让我的孩子过得更好，我得多干点。
We will never fail to live up to what our parents expect of us. 我们决不辜负我们的父母对我们的期望。
Some men on their own will live out of tins rather than cook meals for themselves. 一些独居的男人宁肯靠罐头食品过日子，也不愿自己烧饭吃。
介、副词填空
①She tries up to live________to her ideals.
②Will the old man live________the month?
③I had to live________bread and water when I was a
student.
④I know you live________cheating people.
答案　①up　②out　③on　④by
We met some friends and other people in addition.
我们遇见几位朋友，还遇见其他一些人。
You need money and time, in addition, you need diligence.
你需要钱和时间，除此之外，你还需要努力。
When she fell, she hurt her arm and, in addition，broke her glasses.
她摔倒时，摔伤了胳臂，还摔坏了眼镜。
2. in addition此外，另外【比较网站】　 in addition/in addition to
In addition to an album, I gave him a pen and a pencil.
除了一本照相簿外，我还给了他一支钢笔和一支铅笔。
In addition to all of the above, she won a Pulitzer prize in 2012.
除上述外，她还在2012年获得普立策奖。
In addition to native plants, this garden contains numerous trees and flowers from overseas.
除了当地的植物之外，这座花园还有无数来自海外的花草树木。
选用in addition/in addition to填空
①________， early rising is also good to our health.
②There is a small photo of his girlfriend in his
wallet________the banknotes.
③________making movies, what else do you enjoy?
答案　①In addition　②in addition to　③In addition to
The country had no other choice but to declare war on their enemy.
这个国家没有其他选择，不得不向他们的敌人宣战。
We should declare war on the customs.
我们应向旧习惯宣战。
Britain and the United States declared war on Japan and the Pacific War started.
英国和美国对日宣战，太平洋战争开始。
3．declare war on发动进攻；对……宣战declare against　　　　声明反对/不支持，表态反对
declare for 声明支持/赞成，宣布赞成The students declared against cheating on exams.
学生们反对考试作弊。
Most people in the world declare against warring in Iran.
全世界大部分人反对伊朗战争。
The social group declared for equality between men and women.
这个社会团体声明赞成男女平等。
【完成句子】
①They finally________ ________ ________crime.
他们终于对犯罪行为进行打击。
②When it came to his turn, he stood up and________
________the plan.
当轮到他时，他站起来表示反对这项计划。
③They________ ________improving the public bus system.
他们赞成改进公共交通系统。
④The brave soldiers________ ________ ________the enemy.
勇敢的战士们对敌人宣战。
答案　①declared war on　②declared against
③declared for　④declared war on
She would go to the ends of the earth to make a better life for the family.
为了让她的家庭过上比较好的生活，她愿去天涯海角。
They went to the west and decided to make a life there.
他们去了西部地区，决心去适应那儿的生活。
Nowadays，many young people from the countryside are going to town to make a life themselves.
现在很多农村青年进城去适应新的生活。
4．make a life习惯于新的生活方式、工作等live/lead a．..life　　　　　过着……生活
come back to life 苏醒过来；复苏
bring...back to life 使苏醒；带来了生机
full of life 充满生气
start a new life 开始新生活In a few minutes Tom suddenly came back to life.
一小会儿汤姆突然苏醒过来。
Those curtains made this room full of life.
那些窗帘确实使这房间有了生气。
【完成句子】
①This is a great holiday resort that is______ _______ _______．
这里生气勃勃，是一个绝妙的度假胜地。
②Secret to happiness is to______ _______ _______about giving.
幸福的秘诀就是在生命中为他人奉献。
③Money can make us________ ________ ________ ________，
but not a happy life.
钱能使我们过上富裕的生活，但不是幸福的生活。
④He's decided to emigrate and________ ________ ________
________in China.
他决定移居中国，开始新的生活。
答案　①full of life　②make a life　③live/lead a rich life
④start a new life
It was too late by the time he got to the authorities.
等到他与当局联系上时，已经太迟了。
And by the time I walked into class, the teacher had started teaching already.
等我走进课堂，老师已经开始上课了。
By the time the dancing started they were all in bare feet!
等到跳舞的时候，她们都光着脚了。
5. by the time到……时候为止【温馨提示】
You needn't hurry me. I will have finished it by the time you are ready.
你不用催我，等你准备好我就做完了。
By the time you get home I will have cleaned the house from top to bottom.
你到家之前我将把房子彻底打扫一遍。
I will be hungry by the time our food gets here.
等到我们的菜上来我就得饿了。
用所给动词的适当形式填空
①It________(be) late afternoon by the time the
jeep________(come) back.
②I________(jog) for two hours by the time
you________(reach) Hyde Park.
答案　①was；came　②will have been jogging；reach
Castles in the air cost a vast deal to keep up.
空中楼阁，要有一大笔费用来维持。
He could not keep up and dropped out of the race.
他无法再坚持下去，因此退出了比赛。
I hope the fine weather will keep up.
我希望好天气继续下去。
6．keep up坚持；维持；沿袭(风俗、传统筹)keep away　　　　 避开，戒(烟、酒等)，站开；使离开
keep away from 躲开，避开，不接近
Keep back 隐瞒，不讲；阻止……前进；留在后
面，不上前；扣留，不付
keep down 抑制，控制；压服；缩减开支
keep...free from /of 离开，避开，不接近；戒除
keep hold of 紧紧握住某物，抓住
keep /bear in mind 记住，想着
keep in touch with 与……保持联系keep off 远离，(使)不接近，站开，不在…… 之上行走；挡开，防止
keep on sth/doing sth 继续；反复不断地做某事
keep up with 不落在后面，跟上，及时了解(情况)
Nobody can entirely keep away from this competitive world.没有人能够完全远离这个竞争社会。
She was unable to keep back her tears.
她无法忍住泪水。
We put our books in bookcase to keep them free from dust.
我们把书放进书柜目的是不落上灰尘。
The umbrella is used to keep off the rain.
伞是用来挡雨的。
介、副词填空
①Keep hold________the ropes, don't let the dogs go.
②With the teacher's extra help he has kept________
________the class.
③I have tried to keep the wound free________infection.
④He spread his handkerchief over his face to
keep________flies.
⑤Police warn bystanders to keep________ ________the
burning building.
答案　①of　②up with　③from　④off　⑤away from
“It is likely＋ that-clause”是一个固定句型，likely是形容词，it是形式主语，that-clause为真正的主语。
It is likely that her cousin will be late.
她堂弟很可能会迟到。
It is likely that his mother has known that she has cancer.
他的母亲很可能已经知道自己患上了癌症。
It is likely that she will give up in despair.
在绝望中，她很有可能会放弃。
1．However, it is likely that Native Americans were living in California at least fifteen thousand years ago.然而，很可能至少在15，000年以前美洲土著人就住在加利福尼亚了。sb/sth be likely to do sth　　　　　　某人可能做某事He is likely to visit us if he knows where we live.
如果他知道我们在哪里住，他可能会来拜访我们。
The thing is to know when he is likely to arrive.
关键是得知道他大概什么时候到。
【比较网站】　possible/probable/likely
【温馨提示】
(1)可能性大小排列：probable>likely>possible
Success is possible, but hardly probable.
成功是有可能的，但把握性不大。
(2)possible 和 likely 后面可以接不定式，probable则不能。
She's very likely to ring me tonight.
＝ It's very likely that she'll ring me tonight.
她今天晚上很可能打电话给我。
Will it be possible for someone to meet me at the gate about 9：30 a．m.?
上午九点半左右有人在大门口要见我，有可能吗？
(3)只有 be likely 前面的主语可以是人，而 possible 和 probable 不能。
I'm hardly likely to finish it within a week.
我不可能在一周内把它干完。
(4)只有 possible 后面可以接 for sb to do sth 而 likely 和 probable 不能。
It is possible for us to get from Beijing to Tianjin in less than an hour.
我们有可能用不到1小时的时间就可从北京到达天津。
(5)possible 可和表示条件的连词 if 连用，构成 if possible
(＝ if it is possible to do sth)。
If possible he would like to study Kongfu in China in the
future.如有可能他很想去中国学习功夫。
(6)possible 还可构成 as...as possible，意为“尽可能……”。
You must absorb as much information as possible in the modern society.
在现代社会，你必须接受尽可能多的信息。
【单项填空】
①Tomorrow is Sunday and he has a day off, so he is________to attend our party.
A．probable B．possible
C．likely D．possibility
解析　考查词义辨析。likely强调表面上看来有可能，故选C。
答案　C
②It is________for you to persuade him to go.
A．possible B．likely
C．probable D．possibly
解析　考查词义辨析。只有 possible 后面可以接 for sb to do sth, likely 和 probable 不能。故选A。
答案　A
【句型转换】
③It's likely that he will fail in the exam.
＝_______ ________ ________ ________fail in the exam.
④She's likely to ring me tonight.
＝________ ________ ________ ________will ring me tonight.
答案　③He is likely to　④ It's likely that she
That is why...“那就是……的原因”，why引导表语从句。
That is why they sent you to boarding school.
这就是他们为什么送你去寄宿学校的原因。
He was ill. That is why he was absent from the meeting.他病了，那就是他缺席会议的原因。
The road is being paved in front, and that is why it is blocked time and again.
前方正在铺路，这就是这条路时常堵车的原因。
2．That is why today over 40% of Californians speak Spanish as a first or second language.那就是为什么今天还有超过40%的加利福尼亚人仍然把西班牙语作为第一或第二语言的缘故。The reason why...is that...　　　　……的原因是……
That is because... 那是因为……The reason why we have to grow trees is that they can provide us with fresh air.
我们必须种树的原因是它们能供给我们新鲜的空气。
The only reason why I want to make you happy is that I love you.我想让你幸福的唯一原因就是我爱你。
That is because these planets are composed of gas.
这是因为这些行星都由气体构成。
I think that is because you have right qualifications and nice personality.
我想那是因为你资格符合，性情友好。
【完成句子】
①________ ________ ________I went to this school is that I could see a lot of pretty girls.
我到这所学校上学是因为我能见到许多漂亮的姑娘。
②She had a stomachache. ________ ________ ________she ate so little.
她胃疼，所以只吃了一点儿东西。
③________ ________ ________the computer technology is developing all the time.
那是因为电脑技术一直在发展。
答案　①The reason why　②That is why 　
③That is because
这是一个主从复合句。it作形式主语，真正的主语是that引导的主语从句。It is believed that...，据认为……，人们相信……。
It is believed that health is above wealth.
一般人都相信健康重于财富。
It is believed that the economic situation is critical in3．It is believed that before long the mix of nationalities will be so great that there will be no distinct major racial or cultural groups, but simply a mixture of many races and cultures.人们认为，要不了多久，多种国籍的混合将会非常大，以致于不可能存在一种主要的种族或文化群体，而是多种族、多文化的混合体。Europe.大家相信欧洲经济形势很危急。
It is believed that taking a walk after meals promotes digestion.人们认为饭后散步有助消化。
常用于“It is/was＋ 过去分词＋ that...”结构的动词有say，report，think，hope，suggest，believe，know等。
It was reported that more than ten children had died in the accident.
据报道有十多个孩子在这起事故中遇难了。
It was suggested that we put off the meeting because of emergency.
由于紧急情况，建议我们推迟会议。
上述句型可转换为“sb/ sth＋ be ＋过去分词＋ to do/to have done sth”。
It was said that this monument was set up about 200 years ago.
＝ This monument was said to have been set up about 200 years ago.
据说，这座纪念碑是约200年前竖立起来的。
【句型转换】
①It was said that the doctor operated on the injured man yesterday.
＝ The doctor________ ________ ________ ________ ________on the injured man yesterday.
②This building was reported to have been completed by the end of this month.
＝________ ________ ________ ________this building would have been completed by the end of this month.
答案　①was said to have operated　
②It was reported that