高中英语 选必B5U5-第一课时-starting out 课件

1、高一英语深圳市教育科学研究院2021年深圳市春季深圳市线上课程教学材料：外研版高中英语新教材选择性必修第二册教学内容：Unit 5 A Delicate WorldConnected together 第一课时：Starting Out执教人：王逸聪/深圳市罗湖区罗湖高级中学Unit 5 A Delicate WorldLook at the bottom picture in page 49What can you see?I can see bare ground with trees cut down and almost no grass. What will happen in su

2、ch a place?There will be some disasters, like soil erosion, drought, desertification.easily destroyedVocabulary in Video1. ecosystem 2. biodiversity 3. once in a while 4. go extinct 5. satellite 6. delicate 灭绝生态系统偶尔生物多样性脆弱的卫星Connected togetherActivity 1: Watch a video and think the following questio

3、ns:1. Are humans part of Earths ecosystems? Why?2. In what ways can humans affect ecosystems?Yes. Humans are part of Earths ecosystems. Because all the living things live in ecosystems and people are living things. Humans can affect ecosystems in positive and negative ways. For example, to have a po

4、sitive influence on ecosystems, people can plant trees, feed and protect animals, recycle things, etc. However, deforestation, air and water pollution and excessive waste affect ecosystems in a negative way._ 失败做某事_ 与和谐相处_ 对产生兴趣_ 被引入_ 土壤流失New Phrases of the Unit:fail to doin harmony withdevelop an a

5、ppetite forsoil erosionbe introduced toNew Phrases of the Unit:_ 失控_ 从移除_ 从减少到 _ 因此，结果_ 结果是，证明是turn outin consequencedecrease from.toremove fromout of control_ 大量的_ 一劳永逸的_ 每一个_ 做是有必要的_ 与共存New Phrases of the Unit:a substantial number of once and for allevery lastcoexist withowe it to .to doActivity 2

6、: Look at the satellite images and answer the questions.What is happening to the area according to the satellite images?What do you think a later satellite image would show?Aral Sea is becoming smaller and smaller / shrinking.3.What do you think caused these changes?Maybe its due to over exploitatio

7、n; or human over exploitation. The water area may disappear.Why is Aral Sea shrinking? In the 1960s, people built dams on the two rivers so that they could irrigate the surrounding desert region and focus on cotton production. As a result, the Aral Sea has been decreasing in size, and by 1997, it ha

8、d shrunk to a tenth of its original size, splitting into four lakes. By 2009, the south-eastern lake had disappeared altogether, and the south-western lake had been reduced to a thin strip, with a salinity level of more than 110 grammes per litre.Introduction of Aral Sea (死海)Situated in Central Asia

9、, Aral Sea was once the worlds fourth largest body of inland water. It was famous for its thriving fishing and tourism industry which contributed a lot to the local economy. As it was the most salty sea in the world, contained 10 grammes of salt per litre, people who were not able to swim can easily

10、 float on the sea. Activity 3: What do you know about Aral Sea?What happened after the sea shrank?The shrinking of the Aral Sea became known as “one of the planets worst environmental disasters”.After the sea shrank:1. water disappeared less tourists came tourism decline unemployment2. water disappe

11、ared water was saltierfish and sea animals died the fish industry declined unemploymentWhat happened after the sea shrank?After the sea shrank:3. the water disappeared more salt was left on the seabed extra salt spread to other areas environment got worse4. the water disappeared seabed became dry la

12、nd local weather became hotter and drier living environment got worseFinal result: The decline of the once-thriving fishing industry brings unemployment and economic hardship to the surrounding region.How can human being protect Aral sea?1. Plant more trees or grass to keep the soil.2. Hire more cleaners to pick up the garbage near the sea.3. The country should do more propaganda to encourage the citizen