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1、Unit 1 Nature in the balanceWelcome to the unit & Reading (I)内容分析：本板块围绕单元话题以“保护我们的唯一家园一一地球”创设情境，展开一 系列听、看、说、写等任务活动。任务活动设计围绕一首英文歌曲展开，旨在让 学生明白：人类应该对大自然心怀感恩，对所造成的环境危害心存愧疚，并果断 采取措施来保护我们的家园。Welcome to the unit板块通过歌曲的形式，着重培 养学生听和读的语言技能一一婉转悠扬的曲调、简单易懂的歌词，可以让学生在 学唱的过程中激发探究本单元的兴趣，为单元学习做好热身。阅读板块是纪录片 脚本，内容围绕亚马孙
2、雨林展开，包括亚马孙雨林的基本信息、动植物资源、生 物多样性、对地球的重要作用，以及所面临的危险等。教学目标：By the end of this section, students will be able to:1. sing the English song;know the harm we have done to the Earth;2. understand the significance of environmental protection.教学重难点：1. Understand the concept of balance of nature” from two ways；
3、Learn to sing the song “The Earth is our only home. after discussing questions concerning environmental protection ；2. Learn to use the basic data about the Amazon Rainforest to call on people to protect the “Lung of the Earth”.教学过程：Step 1 Lead-inQI: What key words can you think of when we talk abou
4、t balance of nature?Ecosystem, wildlife, rain forest, human being, pollution, environmental protection, species, survive, greenhouse effect, global warming, extinction, low carbon life and so on.Q2: Look at the slides, what are these animals? What is the relationship between them?Picture one: Jaguar
5、 and sheepPicture two: Hawk and birdThey arc predator and prey, they form the food chain in our nature. They arc part of the ecosystem in our earth.Q3: What does this picture tell us?The number of predator and prey in nature is related.Q4: What does the concept balance of nature“ convey?The expressi
6、on is often used one of two ways. Sometimes the balance is depicted as fragile, delicate, and easily disturbed. Other times its the oppositethat the balance of nature is so powerful that it can correct any imbalances on its own.Quote sharing:Q5: How do you understand Engels words about nature?Let us
7、 not, however, flatter ourselves overmuch an account of our human victories over nature. For each such victory nature takes its revenge on us.一 Fredrich EngelsWe must protect the environment, or human being could not survive.【设计意图：快速引入话题，拓展相关词汇。】Step 2 Listen to the songWhat are the rhyming words in
8、 this song?harm/alarm; seas/trees; clean/green; above/love; pollution/solution.How do you understand “harm and alarm”？“HamT 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 env
9、ironmental damage, which urges us to find a solution.Step 3 DiscussionWhat is the message of this song?1. What can you do to help protect the environment?Possible answer:1. Humans have done much harm to the earth. And we have to take action to change this situation.2. We can use less paper and fewer
10、 plastic bottles and bags. Cutting down on electricity usage can also help reduce the air pollution that power stations create.Step 4 Pre-ReadingAsk the students the following question:What plants or animals do you know about? What is special about them?The cheetah is a large cat native to Africa an
11、d central Iran. It is the fastest land animal, estimated to be capable of running at 80 to 128 km/h (50 to 80 mph) with the fastest reliably recorded speeds being 93 and 98 km/h (58 and 61 mph), and as such has several adaptations for speed, including a light build, long thin legs and a long tail.Th
12、e cheetah is active mainly during the day and hunting is its major preoccupation, with peaks during dawn and dusk. It feeds on small- to medium-sized prey.【设计意图：快速引入阅读，吸引学生的对于“The Amazon rainforest, a natural treasure”的兴趣。】Step 5 Fast ReadingComplete part A1 on page 4 with the main idea of each para
13、graph.Para. 1: Introduction to the Amazon rainforestPara. 2: Basic information about the rainforestPara. 3:Para. 4:Para. 5:Answer: Para. 3: Plant biodiversity; levels of the rainforestPara. 4: Animal biodiversity; food chainPara. 5: The rainfbresfs value to the human race; threats to the rainforest【
14、设计意图：通过快速阅读，抓住每一段的主旨大意，考察学生对信息内容的整 体把握情况】Step 6 Detailed Readingaboutabout in lengthlength1. Finish A2: (on page 4) Read the documentary script again carefully and fill in the blanks with the figures.more than plant speciesaround of forestcountriesone overseas regionAMAZONabout(8)_ of the rainforest
15、 lost over the past 50 yearsmore than bird speciesover of allthe Earth/s oxygen producedrover speciesof mammalsPossible answer：(1)8(2) 6 million(5)1,300(6) 400(3) 6, 400(4) 40,000 20%(8) 17%2. Read para. 3 and figure out different layers of the forest.Possible answer：(1 )The mass of leaf litter.(2)
16、Shorter plants with large leaves.(3)Towering ancient hardwoods. (4) The tops of the tallest trees.3. Read para. 4 and figure out the food chain of a jaguar.4. Watch a video on tropical rainforest ecosystem.【设计意图：通过细读，训练学生了解雨林中的动物及食物链，植物和雨林分层 的情况。】Step 7 In-depth reading: Facts about the Amazon fores
17、t.1. The Amazon is the worlds biggest rainforest, larger than the next two largestrainforests-in the Congo Basin and Indonesia-combined.2. The Amazon is estimated to have 16,000 tree species and 390 billion individual treesNearly two-thirds of the Amazon rainforest is found in Brazil.3. The Amazon i
18、s thought to have 2.5 million species of insects. More than half the species in the Amazon rainforest are thought to live in the canopy.4. 70 percent of South Americas GDP is produced in areas that receive rainfall or water from the Amazon. The Amazon influences rainfall patterns as far away as the
19、United States.5. Cattle ranching accounts for roughly 70 percent of deforestation（滥伐森林）in the Amazon.6. Deforestation（滥伐森林）in the Amazon rainforest has been declining since 2004, mostly due to the falling deforestation rate in Brazil. There are a variety of reasons for the decline, including macroec
20、onomic（宏观经济）trends, new protected areas and indigenous（原住民）territories, improved law enforcement, deforestation monitoring via satellite, pressure from environmental groups, and private sector initiatives.【设计意图：通过深度阅读，帮助学生全面了解亚马孙丛林的情况以及人类因为 滥伐森林而引起的对环境的巨大破坏。】Step 8 Discussion: What can we do to help
21、 maintain a delicate ecological balance? Protecting the ecological balance is an issue that everybody can become involved in. You have the power to have a positive effect, no matter how small, in maintaining the delicate balance of the Earths ecosystem. Recycle to help prevent the over-harvesting of
22、 natural resources. Conserve energy by choosing more energy efficient appliances and automobiles. If everybody uses less energy, pollution decreases and less coal gets used to power the nation and the world. Encourage family and friends to be ecologically aware in the ways that they live day-to-day.
23、 Just as many hands make light work, many individuals working together can help by protecting and maintaining ecological balance.【设计意图：通过激发学生的讨论，培养学生口语及用英语交际的能力，让学生 分析亚马孙雨林作为“地球之肺”的作用及面临的危险。】Step 9 Homework1. Exercises Bl & B2, Page 5;Introduce places in China with rich biodiversity like the Amazon rainforest.教学反思