高二英语下学期Unit13课件 人教.ppt

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1、Period 4Period 4Integrating skills2021/8/11 星期三12021/8/11 星期三2 How much do you know about them?How much do you know about them?Is the economy there well-developed or Is the economy there well-developed or not?not?Which city is the most developed?Why?Which city is the most developed?Why?2021/8/11 星期三

2、3Can you tell what map it is?Where is it?Can you tell what map it is?Where is it?Is the water here salty or fresh?Is the water here salty or fresh?Whats the place where river and the ocean Whats the place where river and the ocean meet?meet?2021/8/11 星期三4SkimmingFind the definition of an estuaryAn e

3、stuary is the body of water where a river meets the ocean.Salt water from the ocean and fresh water from the river mix together in an estuary.This mixing of fresh and salt water creates a unique environment filled with life of all kindsa zone between the land and sea.2021/8/11 星期三5Great places for n

4、atures young animals Great places for natures young animals clean our water by absorbing nutrients clean our water by absorbing nutrients and pollutants from water coming from and pollutants from water coming from inland sources;inland sources;Provide both recreation and Provide both recreation and

5、education for human beings.education for human beings.What kinds of function of estuaries have been mentioned in the passage?2021/8/11 星期三6DiscussionWhat living conditions do you think What living conditions do you think are needed for natures young are needed for natures young ones?ones?Do estuarie

6、s have such conditions Do estuaries have such conditions for them?for them?2021/8/11 星期三71.Why are estuaries such good places for natures young ones?In estuaries,animals can enjoy all the In estuaries,animals can enjoy all the benefits of the oceans without having to benefits of the oceans without h

7、aving to face many of its dangers.face many of its dangers.Tides provide energy for the ecosystems,Tides provide energy for the ecosystems,but estuaries are protected from waves and but estuaries are protected from waves and storms by islands,mud or sand.storms by islands,mud or sand.Nutrients from

8、both the land and the ocean Nutrients from both the land and the ocean arrive in estuaries.arrive in estuaries.Read the passage and answer the following questions.Scanning2021/8/11 星期三84.Why are estuaries more sensitive to pollution than other areas?Because estuaries act as filters(Because estuaries

9、 act as filters(过滤器过滤器),),many many pollutants end up in them.pollutants end up in them.2.What does density mean in this passage?It means the number of species per area.It means the number of species per area.3.How do you estuaries affect the water that passes through them?They absorb nutrients and

10、pollutants from They absorb nutrients and pollutants from water coming inland sources,thus cleaning water coming inland sources,thus cleaning our water.our water.2021/8/11 星期三95.Why are estuaries important to human beings?Estuaries provide both recreation and Estuaries provide both recreation and ed

11、ucation for human beings.education for human beings.People can fish,swim and have fun on the People can fish,swim and have fun on the beach.beach.Scientists and students have endless Scientists and students have endless opportunities to study a variety of life in opportunities to study a variety of

12、life in the habitat.the habitat.Estuaries also contribute to the Estuaries also contribute to the economy through tourism and fishing.economy through tourism and fishing.2021/8/11 星期三10 Estuaries are bodies of water along coasts that are _(形成)when fresh water from rivers flows into and _ with salt w

13、ater from the ocean.In estuaries,the fresh river water is blocked from streaming into the open ocean by either surrounding mainland,or islands.This mixing of fresh and salt water _ a unique environment _ with life of all kinds a zone between the land and sea known as an estuary.Finish the following

14、passage with words from the text.formedmixescreatesfilled2021/8/11 星期三11The estuary gathers and holds a _ of lifegiving nutrients from the land and from the ocean,forming an ecosystem that contains more creatures than any other _ on the earth.Estuaries are also important for human beings.They protec

15、t water quality by _ pollutants from water coming from inland sources.They are centers for _(娱乐)and education.Estuaries,in short,are treasures.varietyhabitatabsorbing entertainment2021/8/11 星期三12Writing 2021/8/11 星期三13If you are describing a process,If you are describing a process,l You should expla

16、in each step in the order it You should explain each step in the order it happens.happens.l Tell the readers about the causes and effects Tell the readers about the causes and effects and use words like first,second,then,etc to and use words like first,second,then,etc to show the order of the steps.

17、show the order of the steps.Tip 1 First Second Third/Then Last 2021/8/11 星期三14If you are writing about something that has If you are writing about something that has several parts,describe each part and explain several parts,describe each part and explain its function and structure.its function and

18、structure.The following questions may help:l What is it?How many parts is it made up of?What is it?How many parts is it made up of?l Whats the structure of each part?How Whats the structure of each part?How does it work?does it work?l Whats the function of the thing?Whats the function of the thing?T

19、ip 22021/8/11 星期三15Imagine that your science teacher ask you to explain one of the following questions:Why Why Why Why does an ice cube float?does an ice cube float?What will happen to a piece of metal if you put What will happen to a piece of metal if you put it in water?it in water?Why do so many

20、species live in estuaries?Why do so many species live in estuaries?Why have so many cities been built by estuaries?Why have so many cities been built by estuaries?Choose one of the questions and write a passage,using what you know about nature and science and what you have learned from this unit.202

21、1/8/11 星期三16 Choose one of the questions and Choose one of the questions and write a passage,using what you have write a passage,using what you have learned about water from this unit and learned about water from this unit and new words and sentence structures of new words and sentence structures of this unit as well.this unit as well.HomeworkHomework2021/8/11 星期三172021/8/11 星期三182021/8/11 星期三19