英語選擇性必修 第四冊Unit 3 Sea Exploration精品ppt課件

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新人教版（2019）英語選修性必修四Unit 3 Sea Exploration  Period 5 Using languageExpress your opinions on sea exploration教學設計課題 Unit 3  Period 5 Express your opinions on sea exploration單元Unit 3 學科English年級Grade 2教材分析該部分的語篇是兩篇議論性質的短文，針對“海洋探索的利弊”表達針鋒相對的觀點。議論文圍繞一個鮮明的觀點展開，往往包含數(shù)個分論點，每個分論點都需要相應的論據(jù)作為支撐。短文一的觀點認為，海洋探索對海洋造成了很大的傷害，弊大于利。第一段開門見山地指出海洋探索往往意味著對海洋的過度開發(fā)，導致許多問題。第二至第四段分別闡述海洋開發(fā)帶來的問題，包括海洋污染、氣候變化、過度捕撈等。針對這三個問題，作者通過舉例等方式進行論證。在第五段，作者總結全文，發(fā)出呼吁：海洋是生命的家園，保護海洋迫在眉睫。短文二的第一句話闡明觀點：要更好地了解我們的星球，就必須探索占據(jù)地球絕大部分面積的海洋。緊接著，作者就反對者的擔憂提出第一個分論點，即為了更好地理解和解決氣候變化等全球問題，我們需要進行海洋探索活動。第二段是第二個分論點，指出海洋探索有利于人類更好地利用資源，并以生物研究、醫(yī)藥開發(fā)、地震預報等為例據(jù)。第三段是第三個分論點，指出海洋探索事關未來的人類生存。第四段，作者再次回應反對意見，認為在環(huán)保與發(fā)展之間需要謀求平衡，并相信隨著技術進步，將更有能力取得這種平衡。通過閱讀正反觀點的文章，學生對于海洋探索議題涉及的爭議有了較為全面的了解。通過比較正反觀點，學生需要思考爭議的根源。教師可以提醒學生，短文一的論斷有一個隱含的前提，即海洋探索往往意味著過度開發(fā)；第二篇短文則更多地關注海洋探索對人類發(fā)展的意義?？傊?，盡管兩種觀點對人類海洋活動的側重點有差異，但本質上都主張要保護海洋、謀求可持續(xù)發(fā)展、對未來負責，形成正確的海洋發(fā)展觀。此外，兩篇短文都為如何有理有據(jù)地表述觀點提供了參考，可供學生在之后的議論文寫作中模仿。學習目標與核心素養(yǎng)To analyzes the arguments and evidence in the texts.To express your opinions on sea exploration.To learn to write an argumentative essay with the help of PEEL method.重點To analyzes the arguments and evidence in the texts.To express your opinions on sea exploration.難點To learn to write an argumentative essay with the help of PEEL method. 教學過程教學環(huán)節(jié)教師活動學生活動設計意圖導入新課 Lead –in  Should sea be explored? The ocean is a treasure. Just as Xi Dada says, oceans  provide a breeding ground for life, connect the world and the promote development. Despite regular discoveries about the ocean, much remains unknown. Scientists predict that 95% of the ocean is unmapped and unexplored. So human being is keeping on exploring the ocean. However, there are arguments about sea exploration.  Students discussif the sea should be explored.To warm up for the reading. 新課Skim Skim the two texts and answer the questions.1.What is the text type of the two passages?(Four types of essay：1. Narrative 2.Descriptive3. Expository4. Argumentative)Argumentative essay.2.What are the three parts in argumentative essay?Argument, evidence, restatement/ recommendation/ a call to action.Read 1. Read the two texts below and find the arguments and evidence in them.Text 1  Text 2Read the two texts again and analyze the structure of them.2.Look at the two charts below and decide which one supports which text.Answers：Decline in oil spills:Text 2 Global trends In the state of world marine fish stocks: Text 1  Discussion In groups, discuss the following questions and take notes.1.What is your opinion about sea exploration? Do you agree with one argument more than the other?I think sea exploration is a wonderful idea, because even if there are no immediate rewards for it, to explore and find out more about our world is always a good thing.2. Has your opinion changed after reading the two texts? Why or why not? Yes, my opinion has changed. Before reading Text 1, I did not know that sea exploration could add to sea pollution, via deep sea drilling for example.3. Are there any other aspects of sea exploration not mentioned that you think are important?We do not know what we don’t know; We need to explore the ocean so that we can better understand issues such as acidification which leads to seawater to become more acidic, and how to fight these problems; Studying the ocean causes the creation of new technologies that can help us in other areas.Pre-Writing Based on your note, write an argumentative essay on sea exploration, expressing your opinions with supporting facts.1) The following questions may help you.?What is the purpose of sea exploration??How does sea exploration help us to protect the sea??How does sea exploration cause damage to the sea??Is there a good balance between protection and exploitation?2) Use the PEEL method to help structure your argument.Point         What point do you want to make?Evidence      What facts and examples can you find to support your point?  How reliable are the sources? Explanation       Explain how the facts support your opinion and show other opinions to be   incorrect.Link           Connect this point to the next point, or back to the main point of the essay or paragraph. 3) Write your draft and exchange it with a partner. Use the checklist to help each other revise the drafts.YesNo   Is the point clear enough?  Are there any examples or facts that support the argument strongly?  Is there any explanation on how the evidence supports the opinion?  Are there some connectives linking one point to another?4) Get your feedback and revise your draft.Sample Even though the oceans make up about 70% of the earth’s surface, more than 80% of the oceans remain unexplored. While some people say that we should not explore the oceans, their reasoning is not very sound. Exploring is not the same as exploiting. When we explore a place. We go just to see and understand what is there.We should explore the ocean, first and foremost, because we do not know what we do not know. We thought we knew many about the ocean, but we were wrong. There could be life forms in the ocean, for example, that fit none of the neat categories we have for life while we have no clue that they even exist.This brings up the second point. We already know many things about the ocean, but we need to learn more. A good example is ocean acidification.We know that it is causing coral to die. We know that using less fossil fuel would cause the process to slow down. However, we need to learn more to find out how to stop it. We need more research to see what is going on, and to come up with plans and solutions.Finally, to do this research, we have to enter an extreme environment not very friendly to humans. This requires the development of new technologies that can also benefit us in other areas. For example, in many ways, the deep ocean resembles outer space.The technologies can benefit each other. For another instance, the technology of a mechanical arm to collect samples with has been used in factories and development of artificial limbs for humans.All in all, there are many good reasons to explore the oceans. If we care about science, about protecting our oceans, and about developing new technologies, we need to do all we can to support ocean exploration.  Students skim the first paragraph of each text  and answer the questions.       Students read the two texts  and find the arguments and evidence in them..       Students read the two texts and analyze the structure of them.        Students look at the two charts decide which one supports which text.    Students discuss the questions in groups.                 Students read the questions and PEEL method before writing an essay.                  Students write  a draft using what they have learnt thus far.Students exchange and present their work.                  To skim  for  the text type of the two passages.        To read to find the arguments and evidence          To read for structure of an argumentative essay.        To practise matching charts to texts.  To develop ideas in group discussion for the preparation of writing an argumentative essay.          To provide both the framework for writing an argumentative essay on sea exploration and a chance to practise what students have learnt.           To help students learn from each other and get advice on improving their work.      作業(yè)Homework Do the exercises on Page 78-79 of Workbook.