懂你英语Level 3 unit 3.doc

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1、【精品文档】如有侵权，请联系网站删除，仅供学习与交流懂你英语Level 3 unit 3.精品文档.Level 3 unit 3 part1ListeningThere are many forms of life on Earth, including human beings.Life exists in a variety of conditions.Some forms of life live in a watery environment, like the oceans.Other forms of life can be found in very dry areas, lik

2、e deserts.However, for any form of life to exist, conditions must be right.When conditions are not right, that form of life will become extinct. Tobecome extinct means to die out completely.-What must be right for life to exist? -Conditions.-What happens if conditions are not right? Life cannot exis

3、t.Conditions must be right for life to exist.Millions of years ago, there were forms of life that no longer exist.When conditions changed, these forms of life died out.One extinction event happened about 250 million years ago.This was the largest extinction event of all time.Many forms of life becam

4、e extinct.96% of all life in the oceans died out.Most insects also became extinct.This event happened over a period of several million years.-What happened about 250 million years ago? Many forms of life became extinct.-What happens in an extinction event? Many forms of life became extinct.The cause

5、s of this extinction event are still unknown.Possible causes include large volcanic eruptions and global warming.Some scientists believe that there were several causes.They believe that a series of events caused the extinctions.Scientists are working to better understand what really happened.-What i

6、s the one possible cause of this event? Volcanic eruptions.In modern times, we humans face changing conditions.For humans to live, we need clean air and clean water.Pollution is now a growing problem around the world.Pollution poisons the air and water that we depend on.Polluted air makes people sic

7、k and afraid to go outside. Pollutedwater poisons our food supply.As a result, we never know which foods are safe to eat.Human beings cannot live in a poisoned environment.Therefore, pollution is a major threat to our existence.-What do humans need to live? Clean air and clean water.-What poisons th

8、e air and water? Pollution.Humans need temperatures to be in a comfortable range.To be in a comfortable range means to be neither too hot nor too cold.With global warming, global temperatures are rising.As temperatures rise, the polar icecaps will melt.As the polar ice caps melt, ocean levels will r

9、ise.Areas of some countries will soon be under water.People will be forced to relocate from flooded areas.-As temperatures rise, what will happen to the polar icecaps? The polar icecaps will melt.-As the polar icecaps melt, what will happen? Ocean levels will rise.In nature, even small changes can s

10、ometimes have large effects.Its difficult to predict whats going to happen.The entire ecosystem that we depend on is changing.Some of these changes are irreversible.Irreversible changes cannot be undone.-What can small changes sometimes cause? Large effects.-What is happening to the worlds ecosystem

11、?Ecosystem is changing.Lets hope that humans are smart enough to understand how the world is changing.With more understanding, we can make better choices about what to do.We can face the challenges of pollution and global warming.We need to do this before its too late.This planet Earth is our only h

12、ome and we need to protect it.-What challenges do we need to face? Pollution and global warming.We need to protect the environment that supports us.VocabularyMammals are covered by hair or fur, have a backbone, and are warm blooded.All female mammals produce milk for their young.Reptiles are covered

13、 by scales, and includes snakes, lizards and turtles.Reptiles have a backbone and are cold blooded, which means they often relied on the external source of heat.Birds are covered by feathers and are warm blooded.Most birds can fly and many types of birds migrate great distances.Most insects such as

14、ants and bees have a small three part of body with three pairs of legs.Some insects, like mosquitoes, spread diseases that cause the deaths of many humans.Unlike animals, plants get the energy that they need from the sun.Plants convert light energy, along with carbon dioxide and water, into chemical

15、 energy.Insects dont have a backbone and most are cooled-blooded.Insects such as ants and bees live in well-organized colonies.Mosquitoes cause the deaths of more humans than any other animal.Mammals include some of the most intelligent animals on earth, such as elephants and human beings.Scales and

16、 rulers are used to measure weight and length.Units of weight include kilograms and pounds, and units of length include centimeters and inches.These instruments are used to observe very large and very small objects.Telescopes are used to by astronomers and microscopes are used by biologists and doct

17、ors.These appliances are used in the kitchens of almost every home.Stoves are used to heat food and refrigerators are used to keep foods cool or cold.Household tools like these are used to build and repair things.Hammers are used to pound in nails and screwdrivers are used to turn a scow.If you need

18、 to pound in a nail, use a hammer.DialogueW: do you know what day it is today?M: what do you mean? Is it a special day?W: oh, so you dont remember.M: remember what? Whats so special?W: its our anniversary. We started dating a year ago today. M:oh, really, Im sorry.-When did they first start dating?

19、A year ago.M: just a minute. What do you think this is?W: oh, its a necklace.M: do you like it?W: yes, I do. Its lovely, especially the red heart. May I put it on?M: no, let me do it.-What did he give her? A necklace.W: so you did remember.M: of course I remembered. Its a very special day for both o

20、f us.W: I have something for you too.M: you do?W: yes, but it will have to wait until later.M: oh, I cant wait. Tell me what it is.-What would have to wait until later? Shes going to give him a gift.Do you know what today is?W: can you guess what it is?M: could you give me a hint?W: we went there si

21、x month ago.M: oh, you mean Alfredos.W: yes, are you excited? You said you really like the food there.M: yes, thats true. I also remember the dessert. Do you?W: yes, but lets not talk about that now. Lets now ruin the surprise.-What is Alfredos? A restaurant.-What arent they going to talk about? The

22、y arent going to talk about the desert.He remembered that today is their anniversaryW: That restaurant looks nice.M: Yes, but it looks expensive.W: Lets go in and look the menu. Wow the menu looks great, especially the fish. M:Yes, it looks good, but look at those prices.-What doesnt she like about

23、the menu? She likes the food choices.M: Lets try somewhere else.W: Sometimes its ok to spend a little money.M: Yes, but these prices are a bit too high, dont you think?W: Yes, there are a bit high. But dont you think Im worth it? Lets enjoy ourselves.M: Ah, ok, if you put it that way. Lets see if we

24、 can get a table. W:Im glad you have your credit card.M: I sure hope the food is good.W: Stop worrying. Lets just enjoy.-Who is going to pay the bill? He will pay the bill.-How is he going to pay? He is going to use his credit card. Heis worried about spending so much moneyLevel 3 unit 3 part2Listen

25、ingQuickServe is a home repair company.It provides quick, reliable repair services to homes.QuickServe handles plumbing and electrical issues, 24 hours a day.It also cleans roofs, fixes internet connections and replaces broken windows.For a small fee, customers subscribe to the service.Its main cust

26、omers are the elderly, which means older people.Whenever customers have a problem, they can call for help.There is also a small service charge for each service call.-What kind of services does QuickServe provide? Home repair servicesThe company was established 5 years ago and is growing rapidly.It s

27、tarted in one city but is now in 5 cities.The company plans to expand to 10 cities within the next 24 months.In each city there is a small central office in the low-rent area of the city.The central office handles the business, advertising, payroll and billing.It also takes calls from customers, eit

28、her on line or by telephone. Ittakes calls 24 hours a day, 7 days a week.-When was the company established? It started five years ago.-Where does the company locate its central offices? They locate in low-rent areas.60% of the companys employees work from their homes.When a customer calls into centr

29、al office, a service employee is contracted.The service employee then contracts the customer and signs up an appointment.These service employees are highly trained and provide excellent service.In emergencies, such as a serious plumbing problem, service can be provided within an hour.One reason for

30、this is that the service employees live in different parts of the city.They are not centrally located so its quicker and easier for them to travel to a customers home.-Where do 60% of the companys employees work? From their own homes.QuickServe has an excellent reputation.Its prices are reasonable a

31、nd its services are quick and efficient.The companys service employees are clean, polite and efficient.In this type of business, person to person contact is the key to success.With each satisfied customer, more customers subscribe.Satisfied customers recommend QuickServe to their friends.This kind o

32、f word of mouth advertising is very cost effective.Cost effective means that the results are good without paying a high price. Inother words, quality service provides its own reward to the company.-What kind of customers recommend QuickServe to their friends? Satisfied customers.-What kind of reputa

33、tion does the company have? It has an excellent reputation.The company takes great pride in being honest with its customers.There are no hidden charges for their services.As a result, the number of customers in each city is growing rapidly.With the aging population there are more elderly people who

34、need home repair services.These people need to have confidence in the service provider.They dont want to be cheated.These people dont mind to pay a reasonable fee for high quality service. High quality service should be rewarded.-What should be rewarded?High quality service.-What is the company prid

35、e of? Its honest with its customers.The company provides a range of service plans, each with the different subscription plans.The least expensive service plan is called the basic plan.This plan provides non-emergency services with a very low service charge.The most expensive service plan is their VI

36、P plan.The VIP plan provides emergency services 24 hours a day with no additional service charge.It also provides rebates to customers who dont call for any services during the year.In addition, QuickServe gives bonus points to customers for each year they subscribe.These bonus points can be used to

37、 buy new appliances such as stoves and refrigerators.-What kind of service plans does the company provide? It has a range of plans.-What can bonus points be used for? Buying new appliances.If the business continues to grow, the owners may decide to take the company public.This means that the public

38、can buy shares of the company.It will then change from a privately-owned company to a public company.The owners believe that their business is successful and can expand around the world. Theyalso believe that taking their company public can make them rich.-Why do the owners want to take their compan

39、y public? They can become rich.VocabularyBiology is the study of life, including its structure and evolution.Biologists study how life survives and reproduces.Chemistry is the study of matter, including the structure of atoms and molecule.Chemists study how various substances interact with each othe

40、r.Astronomy is one of the oldest sciences.Astronomers study the structure and evolution of the universe, including the study of stars, planets, and galaxies.Geology is the study of the structure and history of the Earth and the other planets.Geologists study different types of rocks, earthquakes, an

41、d different layers of the Earth.Mathematic is the study of numbers, shapes, patterns and change. Mathematicis used by all other branches of science.Here are some types of terrible events that hurt or kill people.Earthquakes are caused by forces deep within the Earth.During earthquakes, many people a

42、re often killed by collapsing buildings and bridges.Floods happen when rivers rise and overflow their banks.Flood waters damage or destroy many houses and businesses.Fires destroy buildings, land and forests.There are many causes for fire, including lightning.In a hurricane, high winds destroy build

43、ings, and sometime cause flooding.Some hurricanes have winds of more than 200 miles an hour.Car accidents happen when cars collide, or when drivers lose control of their cars. One of the main causes of car accidents is driving too fast.When people are not careful, they can start fires that can cause

44、 a lot of damage.DialogueW: Whats in the big box you are carrying?M: Its a new desk. I just bought it and now I have to put it together.W: Do you need any help?M: No, I dont think so. I just need to get my tools. Ill need a screwdriver and maybe a hammer. W:Dont forget to read the instructions.-What

45、 does he need? Some tools.W: How are things going?M: Im almost finished.W: Something doesnt look right to me. The right side is higher than the left side. M:Oh, you are right. It looks like I put a couple of screws into the wrong places.-What doesnt look right? The desk.W: So now you have to take it

46、 apart.M: Great. And I thought I was almost finished.W: I told you to read the instructions. Did you read them?M: No, I didnt read them. I hate to read instructions. I looked them, but they were confusing.W: Well, this is what happens when you dont. You were too impatient. Anyway, what can I do to h

47、elp you?M: Would you get another screwdriver and help me unscrew some of these screws? W:Ok, but next time please read the instructions.-What didnt he do? Read the instructions.-What was wrong with the instructions? They were confusing.W: Do you ever look up at the sky and think about life and universe?M: I did when I was a kid. But I dont do that for as much anymore. Why do you ask?W: Sometimes I feel like I lost in day-to-day details. Then when I look up at the sky, I see the big picture. I appreciate things more, even t