1、懂你英语L3Unit3Unit 3-1 ListeningThere are many forms of lives on earth, including human beings. Life exists in a variety of conditions. Some forms of live live in the watery environment, like the oceans. Other forms of lives can be found in very dry areas like deserts. However, for any form of live to
2、exist, conditions must be right. When the conditions arent right, that form of lives can extinct. To become extinct means to die out completely. Conditions must be right for life to exist. Millions of years ago, there were forms of lives that no longer exist. When condition changed, this form of lif
3、e died out. One extinction event happened about 250 million years ago. This is the largest extinction event of all time. Many forms of lives become extinct. 96% of all lives in the oceans died out. Most insects also became extinct. This event happened over a period of several million years. The caus
4、es of this extinction event are still unknown. Possible causes include largest 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 for better understand what really happened
5、. In modern times, we human beings 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 sick and afraid to get outside. Polluted water poi
6、sons our food supply. As a result, we never know which foods are safe to eat. Human beings can be not live in a poisoned environment. Therefore, pollution is a major threat to our existence. Humans need temperature to be in a comfortable range. To be in a comfortable range means to be neither too ho
7、t nor too cold. With global warming, global temperatures are rising. As global temperatures rise, the polar icecaps will melt. As the polar icecaps melt, ocean levels will rise. Areas of some countries will soon be under water. People would be forced to relocated from flooded areas. In nature, even
8、small changes can sometimes have large effects. Its difficult to predict whats going to happen. The entire ecosystem that we depend on is changing. Some of these changings are irreversible. Irreversible changes cannot be undone. Lets hope the humans are smart enough to understand how the world is ch
9、anging. With more understanding, we make better choices about what to do. We can face the challenge of the pollutions and global warming. We need to do this before its too late. This planet of earth is our only home and we need to protect it. Unit 3-1 vocabularyLizard 蜥蜴Mammals are covered by hair o
10、r fur, have a backbone and warm-blooded. All mammals produce milk for the young. Reptiles are covered by scales, includes snakes, lizards and turtles. Reptiles have a backbone and are cold-blooded, which means they often rely on the external resources of heat. Birds are covered by feather and are wa
11、rm blooded. Most of the birds can fly and many types of bird migrate great distances. Most insects such ants and bees have a small 3 parts body with 3 pairs of legs. Some insects, such as mosquitoes, spread diseases that cause the deaths of many humans. Unlike animals, plants get the energy that the
12、y need from the sun. Plants convert light energy along with carbon and water into chemical energy. Scales and rulers are used to measure weight and length. Units of weight includes kilograms and pounds and units of length includes centimeters and inches. These instruments are used to observe very la
13、rge and very small objects. Telescopes are used by astronomers and microscopes are used by biologists and doctors. 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. House tools like these, are used to b
14、uild or repair things. Hammers are used to pound in the nails and screw drivers are used to turn a screw.Mammals include some of the most intelligent animals on earth, such as elephants and human beings.Mosquitoes cause the death of more human than any other animals. Rulers are used to measure lengt
15、hWe can use a telescope to see objects that are far way. Unit 3-1 dialogueDo you know what date is it today? What do you mean, its the special day?Oh, so you dont remember. Remember what? Whats the special?Its our anniversary. We started dating a year ago today. Oh, really. Sorry. Just a minute, wha
16、t do you think this is. Oh, its a necklace. Do you like it? Yes, I do. Its lovely. Especially the red heart. May I put it on?No, let me do it. So you did remember. Of course I remember. Its very special for both of us. I have something for you too. You do? Yes, but you have to wait until later. Oh,
17、I cant wait. Tell me what is it. Can you guess what it is? Could you give me a h? We went there 3 months ago. Oh, you mean Alfredos. Yes, are you excited? You said you really like the food there. Yes, thats true. I also remembered the dessert. Do you?Yes, but lets not talk about that now. lets now v
18、iew in the surprise. That restaurant looks nice. Yes, but it looks expensive. Lets go in and look at the menu. Wow, the menu looks great, especially the fish. Yes, it looks good but look at those prices. Lets try somewhere else. Sometime its ok to spend a little money. Yes, but this price is a bit t
19、oo high. Dont you think?Yes, they are a bit high. But dont you think it worth? Lets enjoy ourselves. Em, ok, if you put it that way. Lets see if we can take the table. Ive got you have a credit card. I sure hope the food is good. Stop worrying, lets just enjoy.Unit 3-2 ListeningQuick serve is a home
20、 repair company. It provides quick, reliable repairs to homes. Quick serve handles plumbing and electrical issues 24 hours a day. It also cleans the roofs, fixes internet connections and replaces broken windows. For a small fee, customers subscribe to the. Its main customers are elders, which means
21、older people. Whenever customers have problems, they can call for help. There is also small charge for each call. The company was established 5 years ago and is growing rapidly. It started in 1 city but its now in 5 cites. The company plans to expand to 10 cities within the next 24 months. In each c
22、ity, there is small central office in a low rent area of the city. The central office handles the businesses, advertising, payroll and billing. It also takes calls by customer either online or by telephone. It takes call 24 hours a day, 7 days a week. 60% of the companys employees work from their ho
23、mes. When a customer calls into the central office, a employee is contacted it. The employee then contacts customer and sets up an employment. These employees are highly trained and provide excellents. In emergencies, such as a serious plumbing problem, can be provided within an hour. One reason for
24、 this is that the employees live in different parts of the country. They are not central located so its quick and easy for they to travel to customers home. Quick serve has an excellent reputation. Its prices are reasonable and its are quick and efficient. The companys employees are clean, polite an
25、d 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 quick serve to their friends. This kind of word-of-mouth advertising is very cost effective. Cost effect means that the results
26、 are good without paying a high price. In other word, quality provides its own rewards to the company. The company take great pride in being honest with the customers. There are no hidden charges for theirs. As a result, the number of customers in each city is growing rapidly. With the aging populat
27、ion, there are more elderly people who need home repairs. These people need to have confidence in the provider. They dont want to cheated. These people dont mind paying a reasonable fee for high quality. High qualitys should be rewarded. The company provides a range of plans, each with a different s
28、ubscription price. The least expensive plan is called the basic plan. This plan provides non-emergency with a very low charge. The most expensives plan is their VIP plan. The VIP plan provides emergencys 24 hours a day with no additional charge. It also provides rebates for customers who dont call f
29、or any during the year. In addition, quick serve gives bonus points to customers for each year they subscribe. These bonuses can be used to buy new appliances such as stoves and refrigerators. If the business continues to grow, the owners may decide to take the company to public. This means that the
30、 public can buy shares of the company. It would then change from private-owned company to a public company. The owners believe that their business is successful and can expand around world. They also believe that taking their company public can make them rich. Unit 3-2 vocabularyBiology is study of
31、life, including its structure and evolution. Biology study how life survives and reproduces. Chemistry is the study of matter, including the structure of its atoms and molecules. Chemists study how various substances interact with each other.Astronomy is one of the oldest sciences. Astronomers study
32、 the structure and evolution of the universe, including the study of stars, planets and galaxies. Geologies is the study of structure of history of the earth and other planets. Geologist study different types of rocks, earthquakes and different layers of the earth. Mathematics is the study of numbers, shapes, patterns and change. Mathematics is used by all other br
