高一英语人教版必修三Unit 4 课文内容

第一篇：高一英语人教版必修三Unit 4 课文内容

Unit 4 Astronomy: the science of the stars

HOW LIFE BEGAN ON THE EARTH No one knows exactly how the earth began, as it happened so long ago.However, according to a widely accepted theory, the universe began with a “Big Bang” that threw matter in all directions.After that, atoms began to form and combine to create stars and other bodies.For several billion years after the “Big Bang”, the earth was still just a cloud of dust.What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.The earth became so violent that it was not clear whether the shape would last or not.It exploded loudly with fire and rock.They were in time to produce carbon dioxide, nitrogen, water vapour and other gases, which were to make the earth’s atmosphere.What is even more important is that as the earth cooled down, water began to appear on its surface.Water had also appeared on other planets like Mars but, unlike the earth, it had disappeared later.It was not immediately obvious that water was to be fundamental to the development of life.What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.This produced a chain reaction, which made it possible for life to develop.Many millions of years later, the first extremely small plants began to appear on the surface of the water.They multiplied and filled the oceans and seas with oxygen, which encouraged the later development of early shellfish and all sorts of fish.Next, green plants began to grow on land.They were followed in time by land animals.Some were insects.Others, called amphibians, were able to live on land as well as in the water.Later when the plants grew into forests, reptiles appeared for the first time.They produced young generally by laying eggs.After that, some huge animals, called dinosaurs, developed.They laid eggs too and existed on the earth for more than 140 million years.However, 65 million years ago the age of the dinosaurs ended.Why they suddenly disappeared still remains a mystery.This disappearance made possible the rise of mammals on the earth.These animals were different from all life forms in the past, because they gave birth to young baby animals and produced milk to feed them.Finally about 2.6 million years ago some small clever animals, now with hands and feet, appeared and spread all over the earth.Thus they have, in their turn, become the most important animals on the planet.But they are not looking after the earth very well.They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space.As a result of this, many scientists believe the earth may become too hot to live on.So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.A VISIT TO THE MOON Last month I was lucky enough to have a chance to make a trip into space with my friend Li Yanping, an astronomer.We visited the moon in our spaceship!

Before we left, Li Yanping explained to me that the force of gravity would change three times on our journey and that the first change would be the most powerful.Then we were off.As the rocket rose into the air, we were pushed back into our seats because we were trying to escape the pull of the earth’s gravity.It was so hard that we could not say anything to each other.Gradually the weight lessened and I was able to talk to him.“Why is the spaceship not falling back to the earth? On the earth if I fall from a tree I will fall to the ground.” I asked.“We are too far from the earth now to feel its pull,” he explained, “so we feel as if no gravity at all.When we get closer to the moon, we shall feel its gravity pulling us, but it will not be as strong a pull as the earth’s.” I cheered up immediately and floated weightlessly around in our spaceship cabin watching the earth become smaller and the moon larger.When we got there, I wanted to explore immediately.“Come on,” I said.“If you are right, my weight will be less than on the earth because the moon is smaller and I will be able to move more freely.I might even grow taller if I stay here long enough.I shall certainly weigh less!” I laughed and climbed down the steps from the spaceship.But when I tried to step forward.I found I was carried twice as far as on the earth and fell over.“Oh dear,” I cried, “walking does need a bit of practice now that gravity has changed.” After a while I got the hang of it and we began to enjoy ourselves.Leaving the moon’s gravity was not as painful as leaving the earth’s.But returning to the earth was very frightening.We watched, amazed as fire broke out on the outside of the spaceship as the earth’s gravity increased.Again we were pushed hard into our seats as we came back to land.“That was very exhausting but very exciting too,” I said.“Now I know much more about gravity!Do you think we could visit some stars next time?” “Of course,” he smiled, “which star would you like to go to?”

第二篇：高一英语 必修三 unit4 复习案答案范文

Unit 4:

Astronomeratmosphereviolentexplodesystemharmfuldevelopmentglobaldependexistpresencedisappointedgraduallygravitylessenmasscheermethodgenerallyexhaust

Exercise 1:

1.Astronomy2.religions3.atmosphere4.exploded

5.spread6.mystery7.developments8.encourage

9.is published10.gravity

Exercise 2:

1.Now that2.on earth3.prevent…from4.in time

5.surface6.dissolves7.depends/depended on8.lays/laid

9.gradually10.was…lessening

Exercise 3:

1.Learning English makes it possible for us to communicate with foreigners.2.What is even more important is that we should take homework seriously

3.She was so seriously ill that it was not clear whether or nor she will come.4.What Japanese economy is to become is uncertain.5.As a result of nuclear radiation, many Japanese are worried about their safety.6.This box is three times as heavy as that one.This box is twice heavier than that one.7.English is as interesting a subject as French.8.He went home tired and hungry.9.The spaceship was pulled close to the satellite by its strong gravity.Exercise 4: 改错

1.glared—glaring2.on—in3.fall—falling4.the—a5.settled—to settle

6.to去掉7.midnight后加that8.what—how9.to use—using10.In—AS

Exercise5:

ACDBAAABCCCAACDCDC

第三篇：高一英语人教版必修三Unit 5 课文内容

Unit 5 CANADA-“THE TRUE NORTH”

A TRIP ON “THE TRUE NORTH”

Li Daiyu and her cousin Liu Qian were on a trip to Canada to visit their cousins in Montreal on the Atlantic coast.Rather than take the aeroplane all the way, they decided to fly to Vancouver and then take the train from west to east across Canada.The thought that they could cross the whole continent was exciting.Their friend, Danny Lin, was waiting at the airport.He was going to take them and their baggage to catch “The True North”, the cross-Canada train.On the way to the station, he chatted about their trip.“You’re going to see some great scenery.Going eastward, you’ll pass mountains and thousands of lakes and forests, as well as wide rivers and large cities.Some people have the idea that you can cross Canada in less than five days, but they forget the fact that Canada is 5,500 kilometres from coast to coast.Here in Vancouver, you’re in Canada’s warmest part.People say it is Canada’s most popular cities to live in.Its population is increasing rapidly.The coast north of Vancouver has some of the oldest and most beautiful forests in the world.It is so wet there that the trees are extremely tall, some measuring over 90 metres.”

That afternoon aboard the train, the cousins settled down in their seats.Earlier that day, when they crossed the Rocky Mountains, they managed to catch sight of some mountain goats and even a grizzly bear and an eagle.Their next stop was Calgary, which is famous for the Calgary Stampede.Cowboys from all over the world come to compete in the Stampede.Many of them have a gift for riding wild horses and can win thousands of dollars in prizes.After two days’ travel, the girls began to realize that Canada is quite empty.At school, they had learned that most Canadians live within a few hundred kilometres of the USA border, and Canada’s population is only slightly over thirty million, but now they were amazed to see such an empty country.They went through a wheat-growing province and saw farms that covered thousands of acres.After dinner, they were back in an urban area, the busy port city of Thunder Bay at the top of the Great Lakes.The girls were surprised at the fact that ocean ships can sail up the Great Lakes.Because of the Great Lakes, they learned, Canada has more fresh water than any other country in the world.In fact, it has one-third of the world’s total fresh water, and much of it is in the Great Lakes.That night as they slept, the train rushed across the top of Lake Superior, through the great forests and southward towards Toronto.“THE TRUE NORTH” FROM TORONTO TO MONTREAL

The next morning the bushes and maple trees outside their windows were red, gold and orange, and there was frost on the ground, confirming that fall had arrived in Canada.Around noon they arrived in Toronto, the biggest and most wealthy city in Canada.They were not leaving for Montreal until later, so they went on a tour of the city.They went up the tall CN Tower and looked across the lake.In the distance, they could see the misty cloud that rose from the great Niagara Falls, which is on the south side of the lake.The water flows into the Niagara River and over the falls on its way to the sea.They saw the covered stadium, home of several famous basketball teams.As they walked north from the harbour area, Li Daiyu said, “Lin Fei, one of my mother’s old schoolmates, lives here.I should phone her from a telephone booth.”

They met Lin Fei around dusk in downtown Chinatown, one of the three in Toronto.Over dinner at a restaurant called The Pink Pearl, the cousins chatted with Lin Fei, who had moved to Canada many years earlier.“We can get good Cantonese food here,” Lin Fei told them, “because most of the Chinese people here come from South China, especially Hong Kong.It’s too bad you can’t go as far as Ottawa, Canada’s capital.It’s approximately four hundred kilometres northeast of Toronto, so it would take too long.”

The train left late that night and arrived in Montreal at dawn the next morning.At the station, people everywhere were speaking French.There were signs and ads in French, but some of them had English words in smaller letters.“We don’t leave until this evening,” said Liu Qian.“Let’s go downtown.Old Montreal is close to the water.” They spent the afternoon in lovely shops and visiting artists in their workplaces beside the water.As they sat in a buffet restaurant looking over the broad St Lawrence River, a young man sat down with them.“Hello, my name is Henri.I’m a student at the university nearby,” he said, “and I was wondering where you are from.” The girls told him they were on a train trip across Canada and that they had only one day in Montreal.“That’s too bad,” he said.“Montreal is a city with wonderful restaurants and clubs.Most of us speak both English and French, but the city has French culture and traditions.We love good coffee, good bread and good music.”

That night as the train was speeding along the St Lawrence River toward the Gulf of St Lawrence and down to the distant east coast, the cousins dreamed of French restaurants and red maple leaves.

第四篇：人教高一英语必修2U2课后练习翻译

Unit 2 Healthy eating

1.这一饮食的缺点是包含了太多的脂肪和糖分，优点是有很多能提供能量的食品。（diet;strength;weakness）

The weakness of this diet is that it has too much fat and sugar;its strength is that it has plenty of energy-giving food.2.那个商店老板试图通过打折来赢回顾客。（win back;discount）

The shopkeeper is trying to win his customers back with a discount.3.如果你不为自己的错误道歉的话，他们是不会放过你的。（get away with）

If you don’t say sorry for your mistake, they won’t let you get away with it.4.他已经负债很久了。对于他来说，如何谋生成了个大问题。（in debt;earn one’s living）He has been in debt for a long time.How to earn his living is a big problem.5.就在我等朋友时，突然发现有个男人在离我不远处正瞪眼看着我。(spy;glare at)

When I was waiting for my friend, I suddenly spied a man not far away glaring at me.6.我不想对你说谎，但是我不得不告诉你他的智力有限。（lie;limited）

I don’t want to lie to you, but I have to say that his intelligence is limited.7.专家说吃胡萝卜对眼睛很有好处。（benefit;carrot）

Experts say eating carrots benefits your eyes.8.我吃饺子时通常都会加点醋，因为醋有助于消化食物。（vinegar;digest）

I usually eat dumplings with a little vinegar, which I believe helps me digest the food.

第五篇：高一英语人教版必修二Unit 3 课文内容

Unit 3 WHO AM I?

Over time I have been changed quite a lot.I began as a calculating machine in France in 1642.Although I was young I could simplify difficult sums.I developed very slowly and it took nearly two hundred years before I was built as an analytical machine by Charles Babbage.After I was programmed by an operator who used cards with holes, I could “think” logically and produce an answer quicker than any person.At that time it was considered a technological revolution and the start of my “artificial intelligence”.In 1936 my real father, Alan Turing, wrote a book about how I could be made to work as a “universal machine” to solve any difficult mathematical problem.From then on, I grew rapidly both in size and in brainpower.By the 1940s I had grown as large as a room, and I wondered if I would grow any larger.However, this reality also worried my designers.As time went by, I was made smaller.First as a PC(personal computer)and then as a laptop, I have been used in offices and homes since the 1970s.These changes only became possible as my memory improved.First it was stored in tubes, then on transistors and later on very small chips.As a result I totally changed my shape.As I have grown older I have also grown smaller.Over time my memory has developed so much that, like an elephant, I never forget anything I have been told!And my memory became so large that even I couldn’t believe it!But I was always so lonely standing there by myself, until in the early 1960s they gave me a family connected by a network.I was able to share my knowledge with others through the World Wide Web.Since the 1970s many new applications have been found for me.I have become very important in communication, finance and trade.I have also been put into robots and used to make mobile phones as well as help with medical operations.I have even been put into space rockets and sent to explore the Moon and Mars.Anyhow, my goal is to provide humans with a life of high quality.I am now truly filled with happiness that I am a devoted friend and helper of the human race!

ANDY-THE ANDROIDI’m part of an android football team.About once a year we are allowed to get together to play a game of football.I’m as big as a human.In fact, I look like one too.On the football team I’m a striker so I have to be able to run very fast.My computer chips help me to move and think like a human.For example, I have learned to signal to my teammates in computer language to give me the ball when I am open and have a good shot for a goal.My first football competition was in Nagoya, Japan several years ago.Last year our team went to Seattle, Washington in the USA.We won second place.Personally, I think the team that won first place cheated.They had developed a new type of program just before the competition.So we need to encourage our programmer to improve our intelligence too.We are determined to create an even better system.In a way our programmer is like our coach.She programs us with all the possible moves she has seen while watching human games.Then she prepares reliable moves to use if a new situation arises.In this way I can make up new moves using my “artificial intelligence”.I would really like to play against a human team, for I have been programmed to act just like them.After all, with the help of my electronic brain which never forgets anything, using my intelligence is what I’m all about!