（2019新教材）外研版高中英语选择性必修一Unit 5 Using language 同步ppt课件.pptx

1、Unit 5 Revealing Nature Period 2 Using language Past perfect Activity 1: Look at the sentences from the reading passage and answer the questions. a Darwin suspected that the finches had evolved from a common ancestor, b Many people refused to believe that living things, including humans, had evolved

2、 from lower forms of life. 1 In sentence (a), which action happened first, “suspected” or “evolved from a common ancestor”? In sentence (a),“evolved from a common ancestor” happened first. 2 In sentence (b), which action happened first, “refused to believe” or “evolved from lower forms of life”? In

3、sentence (b),“evolved from lower forms of life” happened first. 3 What does the structure had done indicate? It indicates the action happened before a certain past action. 过去完成时的基本用法： 1) 表示在过去的某一时间或某一动作或存在的状态，即“过去的过去”。例如: a. Before we got to the train station, the train had already left. (我们到达火车站之前，

4、火车就已经离开了。) b. Before I could say thank you, he had run away. (我还没来得及说谢谢，他就跑开了。) 2)表示从过去某一一时间开始， 一直延续到过去的另一个时间的动作，常用的时间状语有by then,bythe end of, by the time。例如: a. By the end of last term, we had learnt 2,000 English words. (到上学期期末为止，我们已经学习了2,000个英语单词了。) b. They had lived there for ten years by then.

5、(到那时为止，他们已经在那里住了10年了。) 3)表示愿望、打算等的动词，如 hope, want, expect, think, mean, suppose, intend, plan 等后接从句 时，一般用过去完成时表示本打算实现而未实现的愿望和计划。例如: a. I had intended to meet him at the airport, but I had an important meeting to attend. (我本打算去机场接他，但是我有个重 要的会议要参加。) b. | had hoped to take a holiday this year but I was

6、 not able to get away. ( 我原打算今年去度假， 可是我离不开。) 4) 在句型 hardly. when和 no sooner. than中，主句用过去完成时，从句用般过去时， 表示“一. 就.”。例如: a. Hardly had | left when it began to rain. (我刚离开就开始下雨了。) b. No sooner had he sat down than the telephone rang. (他刚坐下，电话铃就响了。) Practise what you have learnt. By the end of last year, he

7、_ (collect) more than 100 foreign records. He once_ (work) as a lecturer, but now he is a manager. John and Jane _h(know) each other for a long time before their marriage. He said that great changes_ h(take) place in his hometown since 1990. He _l(leave) school three years ago. I_ (live) in Beijing

8、for ones year. His brother_ (be) the conductor of the orchestra for many years. This was the second time that the musician_ (tour) Europe. had collected worked had known had taken left have lived has been had toured Activity 2: Complete the paragraphs with the information from the given sentences. T

9、he sentences are in the order in which they happened. They can help you to decide the use of tenses. 1 a Natural disasters led to food shortages in the 1960s. b Yuan Longping began to do research on hybrid rice. c Yuan Longping developed a better type of rice. Yuan Longping 1_to do research on hybri

10、d rice because natural disasters 2_ food shortages in the 1960s. In the end, he 3_a better type of rice. 2 a Gregor Mendel chose to study pea plants because their characteristics were easy to control. b Gregor Mendel made important discoveries about genetics. c Gregor Mendel died in 1884. Gregor Men

11、del 4_study pea plants because their characteristics were easy to control. By the time of his death in 1884, he 5_ important discoveries about genetics. began had led to developed chose to had made 1. shortage n.缺乏，缺缺乏，缺 少；不足少；不足 2.hybrid rice 杂交水稻杂交水稻 3. do research on 在在.方面进行研究方面进行研究 4. in the end

12、 最终最终 5. genetics n. 遗传学遗传学 Activity 3: Complete the online encyclopaedia entry with the correct form of the words in the box. Lonesome George Lonesome George was the last Pinta Island tortoise. He died in 2012. After Georges death, the Pinta Island tortoise was declared extinct. The extinction of t

13、he Pinta Island tortoise is blamed on humans. Before humans 1._ on the island, the species 2._in isolation and 3. _ the plants that naturally grew there. George was discovered many years after their arrival, and by then humans 4._ new species that 5._ for the food the tortoises ate. After goats in p

14、articular had been brought to the island, the Pinta Island tortoise population 6 . Eventually, only George remained. compete decline eat live introduce arrive arrivedhad livedeaten had introduceddeclined Biodiversity Activity 5: Listen to the podcast and choose the statements that are made. 1 Biodiv

15、ersity is important. 2 Bacteria are always harmful to humans. 3 Some species of bacteria are used in food production. 4 Many species of bacteria recycle dead organic matter. 5 Our immune systems are able to fight off all germs. Activity 6: Listen again and complete the fact sheet. Cells Every living

16、 thing is 1 ._ They are like 2 ._ In the human body there are about 3._human cells and around 4. _ bacteria cells. Bacteria Most bacteria in the human body can 5._ In the food production process, bacteria can 6._dead organic matter. made up of cells bricks that are used to build houses thirty tillio

17、n thirty-nine trillion help with digestion break down 听力文本： Jenny: Hello, and welcome to Science Under the Microscope, a science programme for teens. Im Jenny. Josh: And Im Josh. Jenny: This week, as part of our series on biodiversity, we are discussing microorganisms. They are the oldest form of li

18、fe on Earth. Scientists believe they first emerged around three and a half billion years ago! Josh: Thats incredible! Jenny: But you can only see them with a microscope, as these living things are very very small. Were talking about life at the level of the cell. Do you know about cells, Josh? Josh:

19、 Erm. Im afraid not. What exactly is a cell? Jenny: Every living thing is made up of cells. They are like bricks that are used to build houses. By the way, most microorganisms are single-celled. This means that they consist of just one cell. Josh: How strange! Jenny: Actually, were the ones who are

20、unusual. The vast majority of life on this planet is made up of single-celled microorganisms. They re everywhere! In the air, in water,there are even microorganisms. inside you. Im talking about bacteria. Have youheard of bacteria, Josh? Josh: I have, Jenny. But bacteria, inside me? Yuck! Jenny: lau

21、gbs Thats right. You have lots of them living in your body. In fact, an average human body contains about thirty trillion human cells, and around thirty-ninetrillion bacteria cells. Josh: Seriously? Oh, this is making my stomach turn. Jenny: Speaking of which, most of the bacteria in your body help

22、with digestion. And they help make the food that goes into your stomach, too. Without bacteria, we wouldntbe able to make cheese, yoghurt, vinegar. Josh: Really? I didnt know that! Jenny: Oh, and bacteria are also useful at the other end of the food production process. They have an important role de

23、aling with your waste and that of other organisms. Josh: Euw! You mean what goes down the toilet? Jenny: Yes. Bacteria break down this waster and other dead, organic matter, like fallen leaves, into nutrients. Josh: Oh I get it. And these nutrients go back into the soil where they can be used by pla

24、nts! Jenny: Thats it exactly. Josh: All right. Although some of the bacteria may cause diseases in humans, plants and animals, they arent all bad. Activity 8: Read the passage and answer the questions. 1 What species are mentioned and what is special about them? Two species are mentioned: the blue w

25、hale and the water bear. The blue whale is thelargest animal species on Earth, which cangrow up to almost 30 metres in length andweigh over 130,000 kilos. The water bear is probably the toughest species, which can survivetemperatures from 150 to a below freezing-272. 2 What other unusual life forms

26、do you know of? Activity 9: Complete the paragraphs with the correct form of the words and expressions in the box. ancestor scientific be native to primitive habitat appearance be home to ecosystem The Galpagos Islands are renowned worldwide for their unique biodiversity. The Giant Tortoise Reserve

27、on Santa Cruz 1._ several species of giant tortoise that 2._ the Galpagos Islands. The island is also home to the Charles Darwin Research Station, where 3._studies are carried out. Mangroves are one of the coastal plants that grow on Isabela. They serve as the 4._for various birds and fish, and are

28、very important to the 5._ Iguanas can be found on San Cristbal. They have a very special 6_ , with comb-like spines on their back. There is evidence that all the different iguanas have developed from more 7_ ones and share a common 8._ is home toare native to scientific habitats ecosystem appearance primitiveancestor