Unit 1 Nature in the balance Welcome to the unit&Reading ppt课件-（2020）新牛津译林版高中英语高一下学期必修第三册.rar

Unit 1 Nature in the balanceWelcome to the unit & Reading To be aware of the importance of protecting the environment by learning an English song about human and nature. To be able to express opinion on how to help protect the environment.In this unit, you are going to: read a documentary script about a rainforest; write an article for the school newspaper calling for the protection of animals; read a TV show transcript about a polluted city; make a booklet on environmental problems.Watch the video about human and nature. Work in pairs. Share how you feel about the world were living in.Step 1 Lead-inQuote For most of history, man has had to fight nature to survive; in this century he is beginning to realize that, in order to survive, he must protect it. -Jacques-Yves CousteauWhats your understanding of the quotation?Listen & Think What do you think is the message of the song? Which lyrics or words do you like best? Can you share your feeling with us?Listen & Think harm/alarm; seas/trees; clean/green; above/love; pollution/sollutionComprehensionWhat are the rhymes of this song?The earth is our only home The human race has done much harm. We have polluted our soils and seas， And cut down too many trees. Now is the time to sound the alarm. We want to live in a world thats clean； We want to live in a world of green. The human race has done much harm； Now is the time to sound the alarm. Lets be thankful for the skies above； Lets plant new trees and stop pollution； Lets work together to find the solution； The Earths our home to protect and love. We want to live in a world thats clean； We want to live in a world of green. Lets be thankful for the skies above； The Earths our home to protect and love.Step 2 Reading The Amazon rainforest: a natural treasureRead the para. 1. What aspects will be mentioned in the following paragraphs?Reading Para. 1Welcome to the jungle, a huge sea of green alive with the sounds of animals. This is the Amazon rainforest. As the largest rainforest in the world, it plays a significant role in maintaining the fine balance of the Earths ecosystem.Reading Para. 2The Amazon rainforest crosses into eight countries, including Brazil land Peru,on the South American continent. With an area of around 5.5 million square kilometres, the Amazon rainforest is more than half the size of China.The Amazon River, from which the rainforest gets its name, is about 6,400 kilometres in length-around 100 kilometres longer than the Yangtze River.On its journey from the mountains to the ocean, the river supports many different ecosystems. They give this area the richest biodiversity on the Earth: one in ten known species in the world can be found here.Para. 2 Reading Para. 3Of the 390,000 plant species known to us, more than 40,000 can be found in the Amazon. This tall and ancient brazil nut tree produces nuts that we can eat; these water lilies are big enough to lie down on. The forests different levels support an unbelievable variety of wildlife. At the bottom, there is a system of roots beneath the ground. Above that is the mass of leaf litter on the dark forest floor. The next level is made up of shorter plants with large leaves. Then there are the towering ancient hardwoods, and finally the tops of the tallest trees many metres above the ground. Each level of the forest forms its own little world, home to different kinds of living things.Para. 3 Reading Para. 4More than 1,300 species of birds and over 400 species of mammals hide among the jungles plant life. This jaguar is one example. It has a yellowish-brown coat with black spots. While a significant number of jaguars survive here, they are only one element of this forests food chain. They feed on at least 87 species, including frogs. These frogs, in turn, feed on insects which eat leaves and fruit. When a jaguar dies, a tiny army of microorganisms helps break down its body and return the nutrients to the earth.Para. 4 Reading Para. 5The Amazon rainforest breathes life into the planet by fixing carbon and producing over 20 percent of all the Earths oxygen.Thus, it is often known as the“lungs of the planet. Moreover,the Amazon rainforest is a treasure house of species that can be used for food or medicine.Yet there is one major danger to these irreplaceable plants and animals: us. Over the past 50 years,17 per cent of the rainforest has disappeared due to human activities such as agriculture and cattle farming. As the impact of human activities continues to grow and the list of species in danger of extinction becomes longer, we are left with a question: can we afford to damage the“lungs of the planet?A1. Complete part A1 on page 4 with the main idea of each paragraph.Para. 1: Introduction to the Amazon rainforestPara. 2: Basic information about the rainforestPara. 3: _Para. 4: _Para. 5: _Step Step 3 3 Understanding the textPlant biodiversity; levels of the rainforestAnimal biodiversity; food chainThe rainforests value to the human race; threats to the rainforestA2. Complete part A2 on page 4 with the details 8 86 million6 million6,4006,40040,00040,0001,3001,30040040020%20%17%17%Read para. 3 carefully and try to understand the rainforests different levels. Step Step 4 4 Mind mapa system of rootsThe forests different levels support an unbelievable variety of wildlife.the tops of the tallest treesthe mass of leaf littershorter plants with large leavestowering ancient hardwoodsRead para. 4 carefully and try to understand the food chain. JaguarsInsectsAt least 87 species, including frogsLeaves and fruitLeaves and fruitMicroorganismsfeed onfeed on break break downdownfeed onfeed on feed onfeed on While a significant number of jaguars survive here, they are only one element of this forests food chain. The Amazon rainforestAs the largest rainforest in the world, it plays a _ role in maintaining the fine balance of the Earths ecosystem.Basic information about the rainforestPlantsBirds and mammals It crosses into _ and one overseas region of France. It covers around _ square kilometres. It gets its namefrom the AmazonRiver, which is about_ inlength. It has the richest _ on the Earth. There are more than _ plant species, including _ and_ . There are more than_ species of birds and over _ species of mammals such as the jaguar. The jaguar is only one _ of the food chain. Values:* It fixes carbon and produces over _of all the Earths oxygen.* It is a treasure house of species that can be used for food or medicine. Threats:About _ of the rainforest has lost over the past 50 years due to human activities. Value and threatssignificanteight countries6 million6,400 kilometresbiodiversity40,000ancient brazil nut treewater lilies 1,300400element20%17%Step 5 SummaryWhat makes the Amazon rainforest a natural treasure according to the script? What is your answer to the question at the end of the script? Can we afford to damage the “lungs of the plant”? Discuss it with your partner.Step 5 DiscussionStep 7 Buding your languageThe Amazon rainforest is home to a great(1)_of plant life however，its soil is surprisingly poor in nutrients. In fact, the soil in the region can not support(2)_ for more than a few years. If a scientist is shown a report listing the nutrients of that soil, he or she will probably think that only desert plants can(3)_in it. Then why is the soil so poor in nutrients? For one thing，the rainy season has a(n)(4)_on the soil. In the rainy season, the water level can rise to as high as 12 metres. When the water goes away, it takes away the nutrients in the soil. For another thing, (5)_the Amazons hot climate, it is different for the soil to build up enough nutrients.Dead plan and animals(6)_ more quickly. The nutrients are soon taken in by tree roots deep (7)_the ground. As a result, most of the forests nutrients are locked up in the the plants themselves,(8)_allowing the unbelievable growth of the plants.agricultureimpactthusdue tosurvivebeneathbreak downB1 complete with correct wordsComplete partB1 on page 5 varietyB2 Fill in the table below as many words as you canComplete partB2 on page 5 PreflxesWordsun-unbelievabledis-disappearin-/ im-/ il-/ ir-irreplaceablenon-non-smokingNegative prefixesdislike; disabled; disagree incorrect; inconvenient; impossible; illegal; irregularunimportant; unfit; unwell; unfriendlynonverbal; nonfat.HomeworkHomeworkHomeworkHomeworkKnow about the laws of protecting envionmentMake a plan about what you can do to protect the envionment in the daily life Bye-byeBye-bye