1、懂你英语Level4Unit2讲课教案懂 你 英 语 Le v el 4Un i t 2L4 Unit 2-1Listening 物种、环境The earth was born about 4.6 million years ago. The first life appeared about abillion years later. The first plant didn t appear until around 2 billion years ago. Untilaround 580 millio n years ago, life formedweresmall and micro
2、scopic （ 微笑的 ）.Si nee that time, lives has evolved to many differe nt types and species. However, scie ntists estimate that more tha n 99% of them are now ext in ct.They have bee n several ext inction eve nts in the history of the earth. In the exti ncti on eve nt, many life forms or species of life
3、 die out. The causes of the massive ext in cti on eve nts are un soughtmystery. These eve nts are not predictable and can happen at any time. Scientists think that some of that started by asteroid pass or volcano corruption. Events like this, can change the global conditions that life depe nds on.On
4、e major exti ncti on eve nt, happe ned about 66 milli on years ago. That eve nt may have been started by a large asteroid that hit the earth. As a result, the dino saurs and about half of the all species on the pla net, died out. Whe n the asteroid hit the earth, it started a cha in of eve nts. A ch
5、a in of eve nt is a series of eve nts lin ked together, like a cha in.These particular cha in of eve nts happe ned over a period of mon ths and years. When the asteroid hit the earth, it caused huge cloud of dust to enter the atmosphere. This cloud of dust blocked the sun and darke n the earth for a
6、 period of mon ths. Without eno ughsun light, pla nts and pla nt-eat ing an imals, quickly died. With the deaths of so many pla nts and ani mals, the food cha in collapsed . This led to the deaths of many more species.Mass ext in cti on eve nts had played importa nt part in the evoluti on of life. I
7、 n fact,some ext in cti on eve nts had helped to accelerate evoluti on. For example, some mammals lived to the age of dinosaurs, but they couldn t compete. When thedino saurs were removed, the mammals were able to compete more successfully. Once they could compete, mammal evolved to a higher state.
8、Without the ext inction eve nt, perhaps we would n t be here today.Scientist estimate that there have been at least 5 massive extinctions in the pass 540 millio n years. They also believed that we had en tered a new exti ncti on eve nt.Species are beco ming ext inct at a much faster rate tha n befor
9、e. In stead of the asteroid and volca no corruptio ns, the curre nt eve nt is the result of huma n activities. Human activities, for example, had led to global warming.Global warm ing is the result of an in crease in carb on gases in our atmosphere. These gases trap heat from the sun, so the earth i
10、s getting warmer. As a result, sea levels are rising and weather patter ns are cha ngin g. In additi on, we huma ns are destro ying habitats of many pla nts and ani mals. Cutt ing dow n forest and polluti ng rivers destroys the habitats of many forms of life.There is no Ion ger any doubt that this i
11、s happe ning. Specials of lives are disappeari ng at an in creas ing rate. Global temperatures are risi ng and weather patter ns are cha nging. Scien tists are warning us that fast action is n ecessary to save our future. If we don t act, we may go the way of the dinosaurs.L4 Un it 2-1 vocabulary 身体
12、系统、产业、技术The body circulatory system in eludes the heart and blood vessels. The heart pumps the bloods to all parts of body through a n etwork of arteries and vein.The digestive system breaks dow n and absorbs food into the body. It supplies the en ergy that the body n eed s for growth and repair. Af
13、ter digesti on, excess food is turned into waste and eliminated from the body.The n ervous system in cludes the brain, spinal corda nd n erves. This is your con trol system. It con trols your muscles and orga ns in cluded your circulatory system and digestive system.The respiratory system in cludes
14、your nose and lun gs. It brings air and oxyge n into your body and remove the carb on dioxide from the body. The lungs are where oxyge n en ters the bloodstream and carb on dioxide is removed.Immune system protects body aga inst the infections and diseases. Sn eez ing and fever are examples of how t
15、he immune systems works. If the in fectio n in vades the body and the immune system attacks it.The con trol use of fire allowed people to cook food and survive in the colder climates. Fire provided the light so that people could work and socialize for Ion ger hours.With the invention of agriculture,
16、 people can grow food and settle into communities. By growing food, people can spend less time hunting and more time on other thin gs, such as art.The domestication of animals allows people to raise and use animals for food and work. By raise herds of ani mals, such as sheep, people have regular sup
17、ply of meat and clothing. The strength of animals such as horses and oxen was used for work and tran sportati on.The developme nt of tools and mach ines has resulted in a more fashi on manu facturi ng and con struct ion. With better tools and mach in es, works can be done with fewer people and much
18、lower cost.The developme nt of scie nee and engin eeri ng has improved many thing in clud ing com muni cati ons. With un dersta nding of electricity, teleph one and radios allow people to com muni cate over long dista nces.The use of machi nes has reduced the nu mber of people n eeded to make thin g
19、s.L4 Unit 2-1 dialogue谈论手机和老板Itook a vacation last night.What are you talki ng about. Where did you take the vacati on.I did n t go any where. i just left with my smartpho ne.How was it.It was great. I got a real magazine and read it with no interpretation . It was very peaceful. Yes, I haven t done
20、 that for a long time.You know what, I beg in to hate smartph one.Really, but y ou can t live without one, right.Yes, that s the problem.This cha nge the way people live.Yes, I just so on documentary about that. A husband was complaining his wifethat she was spe nding too much time on her smartph on
21、e.What happe ned, did they get divorced.You guess it. In the end, they got divorced.It is a bit ironic , don t you think. Smartphones were supposed to bring peopletogether but they are pulli ng people apart.Yes, you are right.Hey, just a minute, I ve a message on smartphone and it wait. tHey, wake u
22、p and get back to work.What s wrong with you.I m on my break sir and I had a bad headache.Well, you re not paying you to sleep.If you re going to sleep, sleep some places else.Yes, sir, it won t happen again.You had better not.Just a minute. Don t tell me like that.What did you say.You hurt me, you
23、don t have to treat people like that.Well, if you don t like it, I suggest you leave.Ok, I will. I pet eno ugh of you. I will get a job somewhere else.L4 Unit 2-2 Listening 概率、角度he box.This man is hold ing a piece of food in this hand. The piece of food is either an orange or an apple. What can t se
24、e which it s because we can see in sideThe probability that it is an orange is equal to the probability that it is an apple. It may be an apple or it may be an orange. It s going to be one or the other. It cananything else.Now let s look at it from the man s point of view. From his point of view, th
25、eprobability is differe nt. From his point of view, the possibility that he has an orange is 100% or 0%. That s because he knows what he has. For hi m, that is not uncertainty. If he has an orange, the probability is 100%. If he doesn t have an orange, theprobability is 0%. He either has it or he do
26、esn t.From our point of view, the probability that he has an orange is 50%. From his point of view, the probability that he has an orange is 100% or 0%. So the probability depe nds on the point of view.v, he ist bee hard he hasPeople see thi ngs from differe nt poi nts of view. This ofte n leads to
27、argume nts between the people. Here are some examples. From his man s point of viewrelax ing. He n eeds to relax because he has bee n work ing too hard. He has n getting sleep. His wife see things differently. She isn t aware of howbee n work ing. From her point of view, he is doing no thi ng. Howev
28、er, she knows what needs to be done around the house. It isn t fair that she has to work while he does no thi ng. When people see thi ngs from differe nt poi nts of view, they ofte n come to differe nt con clusi on. This differe nces can cause real com muni cati on problems.L4 Unit 2-2 vocabulary 自然
29、灾害、宗教Earthquakes are caused by forces deep with in the earth. Whe n the earth shakes, build ings can collapse and people can be buried in side.An explosi on is a rapid, viole nt release of en ergy. Explosi ons can be caused by chemical react ion, such as in side the engine. A spark can ign ite a mix
30、ture of gases and release en ergy for good an ddestructive purposes.Accide nts are ofte n caused by people doing foolish things or by not being careful. One major cause of accide nt is driv ing too fast. Accide ntswith fire can be very serious, and can result in very painful in juries.Epidemics are
31、the rapid spread of a disease, such as the flu and Ebola. Throughout history, epidemics have killed millions of people. Storms are caused by cha nges in atmosphere, and result in high wi nds and heavy rai ns. Thun derstorms are caused by electric charges in the atmosphere, that produce lighte ning,
32、which can cause forest fire. Some storms cause flood ing, and major damage to homes and cities.Followers of thelslam religio ns are called Muslims. These Muslims are prayer in side the Moses. Muslims are called to prayer 5 times a day, begi nning just before sun rise.Christia ni tyis based on the teachi ng of Jesus crisis, who lived more tha n 2000 years ago. Christian believe that Jesus is the son of god. Christians are often gatheri ng in churchesor cathedralsto worship.
