高一英语(外研版) 必修二 Unit 6 Earth first (4) 2课件.pptx

,必修二 Unit 6 Earth first(4)高一年级 英语,Developing ideasWhats really green?Reading,Look at the questions about“green living”and tick your answers.,Pre-reading,Pre-reading,1.Which shopping bag is more environmentally friendly?A plastic bag.A paper bag.Neither of these.,Pre-reading,2.What should you do to save energy when leaving your home?Turn off a device.Unplug a device.Neither of these.,Pre-reading,3.What food is better for the environment?Food produced near to where you live.Food produced far from where you live.It depends.,Pre-reading,4.Which uses less water?Taking a bath.Taking a shower.It depends.,Its“really”.,Prediction,Q1.Whats the key word in the title?,Look at the title,answer the two questions and try to predict.,Prediction,Q2.What does“really”imply(暗示)?,The information mentioned in the passage may not be true.,While-reading,Q.Do you find something special in this passage?,Skim the passage and answer the question.,While-reading,Q.Do you find something special in this article?,There are four subheadings.,1.Expand on the main heading or title.2.Be slight longer than the main heading.3.Give an overall understanding of the content of a text.,What are subheadings?,Learning to learn,Structure,?,Subheading 1,Subheading 2,Subheading 3,Subheading 4,?,While-reading,Task 1.Read the first and the last paragraphs and answer the questions.Q1.What is the first paragraph about?,While-reading,Most of us are aware that we must take care of the environment,and the majority of us take steps to save energy and reduce waste and pollution.But recently,some“green truths”have been shown to be only half true,or even completely false.Here are some common ones.Which are really green?,Structure,Introduction,Subheading 1,Subheading 2,Subheading 3,Subheading 4,(“green truths”),(“green truth 1”),(“green truth 2”),(“green truth 3”),(“green truth 4”),?,While-reading,Q2.What is the last paragraph about?,While-reading,Environmental awareness is now part of daily life.But its worth checking common ideas and opinions to see whats really green.,Structure,Introduction,Subheading 1,Subheading 2,Subheading 3,Subheading 4,Conclusion,(“green truths”),(“green truth 1”),(“green truth 2”),(“green truth 3”),(“green truth 4”),(check to see),While-reading,Task 2.Read the first“green truth”and decide if the statement in subheading 1 is true or false.Why or why not?,While-reading,Read the first paragraph of subheading 1 and answer question 1.Q1.Are plastic bags good for the environment?Why or why not?,?Paper shopping bags are better than plastic ones.,“Green truth 1”,While-reading,Plastic bags cause litter and are a danger to wild animals,which mistake them for food.It takes hundreds of years for plastic to break down,?Paper shopping bags are better than plastic ones.,cause litter,are a danger to wild animals,take hundreds of years to break down,Plastic bags are bad for the environment.,CAUSES,EFFECTS,While-reading,Read the second paragraph of subheading 1 and answer question 2.Q2.Are paper bags better than plastic ones?Why or why not?,?Paper shopping bags are better than plastic ones.,While-reading,However,making a paper bag uses four times as much energy as making a plastic bag and up to three times the amount of water.The process also produces more greenhouse gases.,?Paper shopping bags are better than plastic ones.,use more energy,use more water,produce more greenhouse gases,Paper bags are not better than plastic ones.,CAUSES,EFFECTS,While-reading,?Paper shopping bags are better than plastic ones.Read the last paragraph of subheading 1 and answer question 3.Q3.Whats really green?,While-reading,In fact,both kinds of bags are bad for the environment.So,take a reusable bag with you when you go shopping.,Both are bad for the environment.,?Paper shopping bags are better than plastic ones.,1.Plastic bags are bad for the environment.2.Paper shopping bags are not better than plastic ones.,Reusable bag is really green.,While-reading,?Paper shopping bags are better than plastic ones.,False.,Is your answer in exercise 1 the same as the truth?,“Green truth 1”,While-reading,Task 3.Read the next three“green truths”and find out the causes,effects and whats really green.,While-reading,?When you turn off a device,it stops using power.,“Green truth 2”,CAUSES,EFFECTS,Whats really green?,While-reading,When we turn off a device,such as television,it goes into stand-by mode.Devices in this mode still use power,and older devices in stand-by mode can use even more.This happens because electricity continues to leak from the device,even when it is turned“off”.,?When you turn off a device,it stops using power.,go into stand-by mode,still use power,use even more,electricity continues to leak,Turning off a device wont stop using power.,CAUSES,EFFECTS,While-reading,To make sure your appliance is in fact off,remove the plug from its power supply.,?When you turn off a device,it stops using power.,go into stand-by mode,still use power,use even more,electricity continues to leak,Turning off a device wont stop using power.,CAUSES,EFFECTS,Remove the plug from its power supply.,While-reading,?When you turn off a device,it stops using power.,False.,“Green truth 2”,Is this truth beyond your expectation?,While-reading,?Eating local food is good for the environment.,“Green truth 3”,CAUSES,EFFECTS,Whats really green?,While-reading,It seems like common sense:eating local food should be better for the environment,because it does not need to be transported long distances and kept cold during transport.Unfortunately,it is not that simple.It is the production of food,not its transport,that uses most of the energy and produces most of the greenhouse gases.,While-reading,In some cases,local produce might have used more energy and produced more greenhouse gases than produce grown a long way awayeven taking into account its transport.,?Eating local food is good for the environment.,use more energy,produce more greenhouse gases,take into account its transport,Eating local food is not always good for the environment.,CAUSES,EFFECTS,It depends.,While-reading,?Eating local food is good for the environment.,False.,“Green truth 3”,Does the truth surprise you?,While-reading,?Its better to take a shower than a bath.,“Green truth 4”,CAUSES,EFFECTS,Whats really green?,While-reading,It depends on how long you spend in the shower and how large your bath is.If you spend more than eight minutes in a shower,youll use as much water as in a bathabout 50 litres of water.Therefore,the key is to keep your shower time as short as possible.,?Its better to take a shower than a bath.,If you spend more than eight minutes in a shower,youll use as much water as in a bathabout 50 litres of water.,Its not always better to take a shower than a bath.,CAUSES,EFFECTS,Keep shower time as short as possible.,While-reading,?Its better to take a shower than a bath.,False.,“Green truth 4”,What is your answer to this question in exercise 1?,While-reading,Lets check to see if all your answers in exercise 1 are correct.,These so-called truths often make people confused and they are really worth checking.,While-reading,Task 4.What is the genre(文体)of the passage?Editorial 社论文(to make an authoritative comment)权威性的评论,Summary,How does this editorial develop?,CAUSES,EFFECTS,Whats really green?,Post-reading,Task 5.Read the effects and complete the causes of these according to the passage.,Post-reading,CAUSES,EFFECTS,1.Making a paper bag uses more energy and water than making a plastic bag.It also produces more greenhouse gases.,Paper bags are not good for the environment.,Post-reading,CAUSES,EFFECTS,2.,Turning off a device wont stop it from using power.,Devices turned off go into stand-by mode and still use power.,Post-reading,CAUSES,EFFECTS,3.,Eating local food isnt always better for the environment.,Local produce sometimes might use more energy and produce more greenhouse gases than produce grown a long way awayeven taking into account its transport.,Post-reading,CAUSES,EFFECTS,4.,Its not always better to take a shower than a bath.,If you spend more than eight minutes in a shower,youll use as much water as in a bathabout 50 litres of water.,Post-reading,Task 6.What is the authors purpose in writing the passage?,Post-reading,1.To introduce us some misunderstandings about environmental protection in daily life.2.To tell us whats really green.3.To teach us to use critical thinking to judge so-called truths.4.To call on us to protect the environment.,Post-reading,Task 7:Give a talk about one of the“green truths”in the passage.,Post-reading,1.Use these questions to help plan your talk.Which“green truth”are you going to talk about?Why do people believe it is“green”?Why is it not completely true?What can you do to become“greener”?,Post-reading,2.Organise your talk following the steps below.Start your talk by stating the topic.Describe your chosen“green truth”in more detail.Explain why it is not completely“green”.End your talk by encouraging your audience to become“greener”.,Post-reading,3.Give your talk to the class.,Post-reading,Sample answer:Today I would like to talk about if paper shopping bags are better than plastic bags.,Post-reading,As everyone knows,plastic bags cause litter and are a danger to wild animals.It takes hundreds of years for plastic bags to break down.Therefore,plastic bags are bad for the environment.,Post-reading,Because of this,some people think paper bags are better than plastic ones.But that is not true.Making paper bags uses much more energy and water.It also produces more green house gases.So we come to the conclusion that paper bags are not environmentally friendly,either.,Post-reading,Since both of the above are not good for the environment,whats really green?I suggest taking a reusable bag with you when shopping.It is really green.Starting from the small things around us,everyone can become a real“greener”.,Post-reading,Task 8:Are you aware of any other“green truths”that are not true?Share them with us.,CAUSES,EFFECTS,Post-reading,Sample answer:I would like to talk about which way of boiling water is more environmentally friendly,with gas or with electricity.It is generally believed that using electricity to boil water is as environmentally friendly as using gas to boil water.,Post-reading,However,it is not that simple.As is the case,it is very convenient and economical to boil water with electricity.But the heat from boiling water with electricity produces more greenhouse gases,even almost three times as much as heating water with gas.,Post-reading,Boiling water with gas can reduce carbon emissions(减少碳排放)and generate heat(产生热量),especially in winter,which helps raise the indoor temperature.,Post-reading,Therefore,it is more environmentally friendly to boil water with gas than with electricity.,Choose one of the tasks to finish.1.Give a talk to introduce one of the“green truths”in the passage.2.Share more“green truths”with the classmates on WeChat.,Homework,Thank you!,