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1、Unit 2 Saving the EarthTopic 1 What can we do at home to protect the environment?Section CLanguage goalsLearn some new words and phrases.Get to know:acid,nuclear,biogas,straw,renewable,disadvantage,process,electric,best-known,maglev train,per,efficient,path,steel,wave,source,run out,worldwide,sunlig
2、ht,steam Be able to use:technology,require,German,wheel,guide,deepBe able to use some useful expressions.(1)In many countries,people produce power from coal,but it is very dirty and causes acid rain.(2)They will never run out so they are called renewable sources.Talk about the advantages and disadva
3、ntages of some kinds of energy.ReviewHow can we become a greener person?Turn off the lights when we leave a room.Walk or ride a bike instead of taking a bus or a taxi.Take a cloth bag when we go shopping.Dont drive a car if you travel a short distance.Write on both sides of the paper.Dont use the th
4、ings that can be used only once.After we wash faces,we can use the water to wash clothes.Turn off the TV set while we are away.section BLearning1a Read and understand.Look at the pictures.Do you know what they are?Choose the right picture for each paragraph.Paragraph 2Paragraph 2 Paragraph 3Paragrap
5、h 3 Paragraph 4Paragraph 4LearningIn many countries,people produce power from coal,but it is very dirty and causes acid rain.Some countries use nuclear energy to produce power.However,nuclear power can be very dangerous.To solve the energy problem,people all over the world are looking for new ways t
6、o produce power.China is one of the first countries in the world to use biogas technology.Farmers recycle straw,grass and animal waste to make biogas.This renewable energy is used in peoples everyday lives.Its key disadvantage is that the process requires a long time(up to 30 days)and the cost is hi
7、gh.LearningElectric vehicles were developed in the 1990s.On April 11,2010,a new kind of electric vehicle named“Yezi”was shown in the 2010 Shanghai World Expo.It produces electricity from the sun,the wind and CO2.It can not only protect the environment but also save enerey.Its too small to hold many
8、people,but larger models will be developed in the near future.In China,the best-known maglev train is the German-built one in Shanghai.It takes people just 7 minutes to go to the airport 30 km away.The train can reach a top speed of 431 km per hour.It is quiet and quick.There is no wheel noise,becau
9、se there are no wheels.Maglev trains are very energy-efficient and do not pollute the air.However,maglev guide paths are much more expensive than traditional steel railways.Learning1b Read 1a and match the words with the pictures on Page 48.A.acid rain B.nuclear energy C.biogas ACBLearning1c Read 1a
10、 again and complete the table.ItemAdvantageDisadvantagebiogas electric vehicle maglev train renewablelong process and high costsave energy,no pollutiontoo small to hold many people quiet,quick,energy-efficient,no pollution much more expensiveLearning2a Read the passage below and match the pictures w
11、ith the sentences.Then discuss in detail the use of one energy source.The sun,wind,waves and heat from deep in the earth are energy sources.They will never run out so they are called renewable sources.In 2011,about 16%of energy used worldwide came from renewable sources.The use of it is increasing r
12、apidly each year.Learning2a Read the passage below and match the pictures with the sentences.Then discuss in detail the use of one energy source.（2）（4）（1）（3）1.Wind can produce electricity in many places.2.People use sunlight to produce electricity.3.Sea waves are used for producing electricity.4.Peo
13、ple use hot water or steam from deep in the earth to produce electricity and heat for factories,schools and homes.Learning2b Take notes on your discussion and write a passage with them.You may begin like this:Sunlight can produce a lot of energy.People began to use the energy from the sunlight in di
14、fferent ways many years agoLearningExampleSunlight can produce a lot of energy.People began to use the energy from the sunlight in different ways many years ago.We can use it to warm the house in the winter,to heat the water for baths,and to produce electricity.Whats more,we can even use it to run v
15、ehicles directly in the near future.As is known to us,the energy from the sunlight has a lot of advantages.For example,it is clean,renewable and non-polluting.Besides,it does no harm to our nature.So wed better use it as much as possible.Language points1.Some countries use nuclear energy to produce
16、power.use sth.to do sth.使用某物做某事nuclear energy 核能Language points2.However，nuclear power can be very dangerous.however 然而dangerous 危险的Language points3.To solve the energy problem,people all over the world are looking for new ways to produce power.all over the world 全世界looking for 寻找Language points4.Ch
17、ina is one of the first countries in the world to use biogas technology.one of+可数名词复数 之一biogas technology生物技术Language points5.Electric vehicles were developed in the 1990s.in+the+年份s 在几世纪几十年代Language points6.It can not only protect the environment but also save enerey.not only.but also 不但而且 Language
18、 points7.Its too small to hold many people,but larger models will be developed in the near future.too+adj.to do sth.太而不能做某事 Language points8.It takes people just 7 minutes to go to the airport 30km away.It takes sb.sth.to do sth.花费某人多长时间做某事 Language points9.Maglev trains are very energy-efficient an
19、d do not pollute the air.energy-efficient 节能的Language pointsuse sth.to do sth.使用某物做某事使用某物做某事nuclear energy 核能核能 all over the world 全世界全世界look for 寻找寻找biogas technology 生物技术生物技术not only.but also 不但不但而且而且too+adj.to do sth.太太而不能做某事而不能做某事It takes sb.sth.to do sth.花费某人多长时间做某事花费某人多长时间做某事 energy-efficient
20、节能节能SummaryTalk about the advantages and disadvantages of some kinds of energy.1.Some words:acid,nuclear,biogas,straw,renewable,disadvantage,process,electric,best-known,maglev train,per,efficient,path,steel,wave,source,worldwide,sunlight,steam,technology,require,German,wheel,guide,deep2.Some phrases
21、:run out3.Some sentences:(1)In many countries,people produce power from coal,but it is very dirty and causes acid rain.(2)They will never run out so they are called renewable sources.Exercise一、单项选择一、单项选择()1.We all know that learning a language _ time and effort.A.requires B.reduces C.removes ()2.We
22、think human beings may live on the moon in the future._,no one is sure about it.A.While B.Whatever C.However()3.What do you think of your new classmate?She _ has good grades _ is glad to help others.A.too.to B.not only.but also C.so.thatACBExercise一、单项选择一、单项选择()4.Do you take exercise every day?Yes.I
23、t usually _ me about half an hour to do that.A.spends B.costs C.takes()5.Do you think fresh water can _ on earth one day?Im afraid so,if people dont save it.A.take outB.go out C.run out CCExercise二、用所给的适当形式填空二、用所给的适当形式填空guide,wheel,require,German,technology1.He studies at a college of science and _.
24、2.Kris and Karl come from Europe.Theyre _.3.The front _ of the bike was out of shape.4.Please call me if he _ my help.5.I know the place well,so let me be your _.technologyGermanswheelrequiresguideHomework1.Read 1a.2.Memorize the useful expressions and key sentences which we learn today.3.Finish Section C in your workbook.4.Write a passage about one of the energy sources in 2a.