英语选择性必修 第四册Unit 3 Sea Exploration精品ppt课件

教学过程

新课

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 2

Read 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.

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.

作业

Homework

Do the exercises on

Page 78-79 of Workbook.