Unit 1 Nature in the balance Welcome and reading ppt课件（含听力素材）-（2020）新牛津译林版高中英语必修第三册.rar

Unit 1 Nature in the balanceWelcome to the unit & Reading Lead inLook and think PresentationPresentationHoweverHoweverHoweverHowever, , , , it is a totally different situation in it is a totally different situation in it is a totally different situation in it is a totally different situation in some other places !some other places !some other places !some other places !Presentationair pollutionlarge-scale constructionwhite pollution Let us not, however, flatter ourselves over much on account of our human victories over nature. For each such victory nature takes its revenge on us. Friedrich Engels“但是我们不要过分陶醉于我们人类对自然界的胜利。对于每一次这样的胜利，自然界都对我们进行报复。” 恩格斯Welcome to the unit Listen to a song! Discussion 1. What is the message of the song?Humans have done much harm to the Earth, and we have to take action to change the situation.2. What can we do to help protect the environment? plant more trees use less paper drive less and walk more use fewer plastic bottles and bags save water and cut down the use of electricity dont waste food dont use one-off things if possible, dont use air conditioners .3. How do you understand “harm” and “alarm” ?“Harm” means something bad we have done to the earth, including polluting soils and seas, cutting down too many trees, etc. “Alarm” means the signal that warns us of the dangers of environmental damage, which urges us to find a solution.Pre-readingDo you know where it is?The Amazon rainforest: a natural treasureWhat will be talked about in the text according to the title and the picture?What could be the genre（体裁） of the article? the Amazon rainforest documentary script (纪录片脚本） PredictionAnalysing the structureListen to 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: _Plant biodiversity：levels of the rainforest（plants）Animal biodiversity：food chain （birds and animals）The rainforests value to the human race; threats to the rainforestPassage Structure Read carefully again and fill in the blanks with the figures. 8 86 million6 million6,4006,40040,00040,0001,3001,30040040020%20%17%17%What is the purpose of using so many figures?To support the statement and make the statement more persuasive and convincing; to make the factsvivid and specific by making comparisons with figures.Read para. 1 carefully and try to find the theme of the script. Find a sentence to match the pictureRead paragraph 2 a 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 Paragraph 3 and complete the mind map about different levels of the rainforest.brazil nutwater lilyjaguarsinsectsat least 87 species, including frogsleaves and fruitleaves and fruitmicroorganismsfeed onfeed on break downbreak downfeed feed onon feed onfeed on While a significant number of jaguars survive here, they are only one element of this forests food chain. nutrients Read para. 4 carefully and try to understand the food chain. Read para. 5 carefully and try to understand the importance and danger. 1. Why does the Amazon rainforest play a significant role in maintaining the balance of the Earths ecosystem?2. Can we afford to damage the “lungs of the planet”?the “lungs of the planet” a treasure house of species forfood and medicine materialsNo. The Amazon rainforest is far too important for us to allow it to be destroyed. It helps maintain the balance of the ecosystem and provides our society with food and medicine.Language practiceThe 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 cannot 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, B1 varietyagriculturesurviveimpact(5) the Amazons hot climate, it is difficult for the soil to build up enough nutrients. Dead plants and animals (6) more quickly. The nutrients are soon taken in by the roots of the plants deep (7) the ground. As a result, most of the forests nutrients are locked up in the plants themselves, (8) _ allowing them to grow at an unbelievable speed.due toare broken downbeneaththusWords formed with negative prefixesB2PrefixesWordsun-dis-in-/im-/il-/irnon-unbelievable, unlimited, unhappy, unknown, unusual, unreal, unfortunate, unlucky, unkinddisappear, disagree, disadvantage, dissatisfied, dishonest, disabledirreplaceable, invisible, incorrect, inactive, independent, impolite, imbalance, illegal, irregular, irresponsiblenon-smoking, non-stop, non-existent, non-profit, non-fictionLanguage rule1. You will be _ (able) to pass the exam if you dont study hard.2. If someone doesnt show good manners to others, he is _ (polite).3. Simon is such a(n) _ (honest) person that no one believes him.4. It is so _ (fair). Mary gets more money for less work.5. They looked poor and _ (healthy).6. Would you let other peoples _ (sense) change your mood?7. Most of that money goes to _ (profit) organizations that run programmes for the poor.8. It is _ (friendly) of him to say such bad words to his classmates.unfriendlyimpolitedishonestunfairunhealthynonsensenon-profitunableFill in the blanks with words with negative prefixes. Homework1. Write a summary of the script based on the chart discussed in class.2. Finish the workbook.