Unit 5 Section Ⅰ“Understanding ideas”的课文习读环节-【新课程学案】2025-2026学年高中英语选择性必修第二册配套课件PPT（外研版）

该高中英语课件围绕“保护脆弱星球”主题，整合生态保护相关听、读、看输入活动与演讲稿写作、话题讨论输出任务，通过Macquarie Island案例精读与泛读结合，构建“问题-措施-结果”的知识支架，衔接it作形式宾语语法学习与真实语境运用。 其亮点在于融合文化意识与思维品质培养，如通过漓江生态治理、塑料回收等案例分析人类活动对生态的影响，引导学生树立人类命运共同体意识。采用“课文写法借鉴+美文阅读润心”模式，赏析用词修辞与环境描写，提升语言能力，助力教师高效开展主题式教学，促进学生环保素养与语言综合运用能力提升。

A delicate world UNIT 5 1 把握单元素养目标 主题意识 本单元的主题是保护我们脆弱的星球。通过了解生态系统面临的问题和发生的变化，认识到人类的生存必须依赖于良好的自然生态系统，保护生态就是保护人类，坚定人与自然和谐共处的理念，树立人类命运共同体意识。 语法项目 归纳总结it作形式宾语的用法，并能在真实语境中灵活运用。 语言输入 听 能够听懂与保护生态相关的话题，把握核心思想和细节信息。 读 能够读懂与保护生态相关的文章，增强环保意识。 看 观看介绍生态系统中所有生物之间相互依赖关系的视频，思考人类对生态系统的影响。 语言输出 写 能够掌握演讲稿的结构特点及如何运用数据引用、举例和作比较的写作方法来支撑观点。 说 能够就与保护生态相关的话题进行讨论，并能恰当使用所学词汇、句型描述不同生态系统面临的问题和发生的变化。 续表 “Understanding ideas”的 课文习读环节 Section Ⅰ 课文阅读理解 课文写法借鉴 美文阅读润心 课时跟踪检测 Contents 目录 01 02 03 04 5 01 课文阅读理解 泛读课文，完成以下学习任务 (一)理清文脉结构 leading to South-west Pacific Ocean a wild and natural beauty World Heritage Site in perfect harmony developing an appetite for removing released exploded dropping poison (二)把握主旨大意 What's the main idea of the text？ A．How Macquarie Island was saved from destruction. B．The chaos caused to Macquarie Island by humans. C．A funny story about what happened on Macquarie Island. D．The ways in which an ecosystem can be protected. √ 精读课文，完成以下学习任务 (一)阅读理解 1．What can we learn from the first paragraph？ A．Macquarie Island is a UNESCO World Heritage Site because of its wild and natural beauty. B．The green grass and bare rock of its landscape on Macquarie Island form its beauty. C．Royal penguins，king penguins and elephant seals live in perfect harmony now. D．The writer is standing on Macquarie Island enjoying its wild and natural beauty. √ 2．What is mentioned in the second paragraph？ A．When humans arrived on the island，they hunted the birds on the island. B．So many rats and mice were brought to the island on purpose. C．Rats and mice have been taking over the island， eating the birds' eggs so far. D．Cats were introduced to the island to control the rats and mice. √ 3．What was the cause of soil erosion according to the passage？ A．Rabbits were introduced to the island，multiplying rapidly and digging holes. B．Parakeets， native to the island， died out because of humans' activities. C．The increasing number of cats led to more cats hunting the birds. D．Rats and mice multiplied rapidly and dug holes. √ 4．Which method to remove the rabbits from the island was used effectively in the 1970s？ A．A large number of dogs were released. B．A large number of birds were released. C．A virus was released onto the island. D．A large number of cats were released. √ 5．What can we infer from the former methods of controlling invading species？ A．They all brought about some negative effects to the ecosystem. B．They turned out to be quite successful in the end. C．The number of rats was under good control. D．The rabbits developed a new appetite for birds. √ 6．What caused some land to collapse at the beginning of the 21st century？ A．The departure of the cats from the island. B．The increasing population of mice and rats. C．The digging of the rabbits. D．The death of a number of penguins. √ (二)阅读表达 1．What's the author's mission on the island？ ________________________________________ 2．How do you understand the sentence “ ...we humans owe it to the island to give it a happy ending.” at the end of the passage？ ____________________________________________________________________________________________ Remove the last remaining invading species. It is humans that have caused great damage to the island and it is our duty to help it return to normal. |阅|读|技|能|提|升| 关注首段；理清时间线 本文是一篇记叙文，采用了倒叙的写作手法。读文时应优先扫读第一段，因为采用倒叙结构的文章通常在第一段交代事件的结局或事件中最突出的问题。关注首段，有利于把握此类文章的主旨。其次，找到事件的起止点，分清哪些内容是倒叙，哪些内容是顺叙，进而理清文章的时间线索，把握行文脉络。 02 课文写法借鉴 (一)赏用词之妙 1．Unfortunately， the cats subsequently developed an appetite for the birds， too. 赏析：本句中的Unfortunately表达了作者的叹惜之意；短语developed an appetite for则风趣、生动地描写了被带来捕鼠的猫却开始捕捉岛上的鸟类的情形。 2．Loose on the island， they did what rabbits do best — they multiplied rapidly and began eating the native vegetation and digging holes， which caused soil erosion. 赏析：本句中用rapidly修饰multiplied，突出了兔子的繁殖速度之快。 3．The cats in consequence turned their attention — and their stomachs — back to the native birds，killing up to 60，000 each year. 赏析：本句中使用了in consequence来表示结果，相比于简单地使用“therefore， so”等更能彰显写作功底。其他可用来灵活表达结果的还有 end up doing， only to do以及therefore doing， thus doing等。 4．So， I am here on Macquarie Island to participate in the programme to tackle this very problem. 赏析：本句中的tackle是“处理，对付”的意思，该词相比于deal with更能强调待处理的问题的难度。 [提能训练|完成句子] ① _____________ ， this happy story ended with a sad ending. 遗憾的是，这个快乐的故事结局却比较伤感。 ②The scientists made joint efforts， and_______________________ ____________________. 这些科学家勠力同心，因此取得了重大突破。 ③I eagerly unpacked the package，___________________________. 我急切地打开包裹，结果只在里面发现了一本破损的书。 Unfortunately in consequence they made a great breakthrough only to find a broken book in it (二)赏修辞之功 But as the saying goes， “While the cat's away， the mice will play.” 赏析：此处引用了谚语“While the cat's away， the mice will play.”说明由于猫从岛上消失后，老鼠开始泛滥成灾。谚语的恰当使用使文章形象生动，富有趣味。 [提能训练|翻译下列谚语] ①When the cat runs on the roofs， the mice dance on the floors. ________________________________ ② A year's plan starts with spring. ___________________ ③Friends may meet， but mountains never greet. _______________________________ 只要猫上了房，老鼠就在地上忙。 一年之计在于春。 山与山不相会，但人与人总相逢。 (三)赏描摹之韵(环境描写) Strong winds and stormy seas have helped sculpt its long， thin shape.The green grass and bare rock of its landscape contrast dramatically， giving it a wild and natural beauty. 赏析：此处先用Strong winds and stormy seas描写了海岛的自然环境：充斥着强风和惊涛骇浪；然后用The green grass and bare rock 描写了岛上的景色：绿草和光秃的岩石形成反差巨大的自然景观；最后用wild and natural beauty点评：海岛呈现出一种狂野和天然的美。 03 美文阅读润心 漓江位于桂林市区以南，是桂林最重要的自然景观之一，也是中国最美丽的河流之一。江水清澈见底，掩映在两岸碧绿的青山下，恍如一副绝美的画卷。然而，大约20年前，漓江的水质和沿江生态却是另一番景象。采石挖砂、乱砍滥伐、工业废水及生活污水排放等都破坏了漓江以及两岸的生态系统，络绎不绝的游客更是使当地环境进一步恶化。为了守护漓江的生态底色，当地政府采取了一系列措施，打响生态保卫战，最终留住了桂林山水之美。 The beautiful Li River and its amazing surrounding scenery is one of the most well-known tourist destinations in China's Guangxi Zhuang Autonomous Region.It attracts millions of domestic and foreign visitors each year.However， its reputation as a top destination has had negative effects on the river's water quality. Previously， water quality in the Li River had suffered greatly from an increasing volume of tourists，many of whom frequently threw garbage into the river.Many tour boats contributed to the problem， too.Kitchens on board were using lots of oil， which was often thrown into the water.The growth in tourism also meant the local population rose rapidly， as well as the number of commercial and industrial enterprises.Water pollution levels increased， with more household and commercial waste ending up in the river.In order to feed more people， more chemicals were used to increase crop production.These chemicals led to severe water quality issues， causing a decrease in the number of fish species. ① A comprehensive initiative was started，with a number of measures that addressed the issues.The construction of waste water treatment facilities improved the water quality and water conservation.The collection and transport of household waste was also improved.Dozens of polluting enterprises were closed or moved.The local government set up strict regulations regarding further industrial development.New rules were also introduced regarding tour boat routes and garbage disposal methods.Furthermore， the local authorities began to use the media to spread environmental awareness and encourage greater use of clean energy.With these measures， it is believed that the beauty of the Li River will be preserved for generations to come. ② [阅读理解] 1．What led to the water pollution in the Li River according to the passage？ A．The use of clean energy. B．The reduction of the number of fish species. C．The growth of tourism and related human activities. D．The construction of waste water treatment facilities. √ 2．What can we infer from the passage about the local government's measures？ A．They were mainly aimed at attracting more tourists. B．They were not effective enough as the pollution was still serious. C．They only focused on the construction of treatment facilities. D．They were comprehensive and covered various aspects of pollution sources. √ 3．What is the main idea of the passage？ A．The Li River's fame as a tourist spot. B．Tourism's impacts on the Li River. C．Government's efforts to attract tourists. D．Measures to protect the Li River. √ [素养积累] 1．由文积词汇 reputation n．　　　　　 名誉 enterprise n. 企业 comprehensive adj. 综合的 initiative n. 倡议 facilities n. 设施 regulation n. 章程 2．据文悟句式 句①本句是“many of＋关系代词”引导的非限制性定语从句。 句② with a number of measures ...为介词短语，其中that addressed ...为that引导的定语从句，修饰先行词measures。 04 课时跟踪检测 Ⅰ.阅读理解 A In a small tea shop located in Bisalpur， Uttar Pradesh， one can spot unique furniture like stools (凳子) and tables made of bricks and recycled plastic.Other than customers， tourists who come to visit the nearby Jawai Dam often stop by here to hand plastic waste over to the shopkeeper.Run by Kana Ram Mewada， the shop not only sells tea and snacks， but also leads a campaign to reduce the use of single-use plastic in the village. According to a report of the Central Pollution Control Board (CPCB) in 2019－2020， 3.5 million metric tons (公吨) of plastic waste is annually generated in India， and will remain in landfills (垃圾填埋场) for the upcoming hundreds of years. Kana was deeply disturbed after reading that report on the Internet and began thinking about ways to raise the villagers' awareness and make his village free of plastic. He started a campaign by collecting plastic waste from his own shop and roadside.Whenever customers came， he explained the campaign.In order to attract more people， he started giving something in return for the waste they brought.Sometimes， he purchased a few things made of recycled waste to show the villagers and told them they were created from their plastic waste contribution.He also made decorative items out of the waste and placed them around the shop. As a result， people from the village became curious about his campaign.Even tourists began participating in the exchange.And today， the forest， rivers and public spaces that were once filled with plastic waste are cleaner than before. He hopes that he can also help the neighboring villages recycle plastic waste and make the whole area plastic-free.“When an ordinary person like me decided to start a cause， it was inspiring that a whole village stood by me and supported me.We can all become torchbearers (启蒙者) for a better tomorrow.What we have to do is take a step forward，” he said. 语篇解读：本文是一篇记叙文。文章主要讲述了店主Kana Ram Mewada在看了网上的报告后，决定发起收集塑料垃圾，让村庄远离塑料的运动。他把塑料做成一些独特的家具，吸引了很多人参与。 1．What led Kana to start the campaign？ A．An online report.　　 B．Tourists' behavior. C．Customers' advice. D．His visit to landfills. √ 解析：细节理解题。根据第二段内容以及第三段“Kana was deeply disturbed after reading that report on the Internet ... free of plastic.”可知，是一篇网上的报告让卡纳发起了这场运动。 2．Why did Kana place plastic decorations around his shop？ A．To get more people to join his campaign. B．To teach shoppers how to make them. C．To make his shop much more beautiful. D．To advertise the goods in his shop. √ 解析：细节理解题。根据第四段内容可知，卡纳在他的商店周围放置塑料装饰是为了让更多的人加入他的运动。 3．Which of the following can best describe Kana？ A．Considerate and proud. B．Ambitious and generous. C．Responsible and creative. D．Determined and humorous. √ 解析：推理判断题。根据第一段第一句以及第三段可知，卡纳有责任心和创造力。 4．What is the text mainly about？ A．A shopkeeper's path to success. B．A historic tourist spot in Bisalpur. C．A unique way of turning waste into art. D．A shopkeeper's campaign for plastic recycling. √ 解析：主旨大意题。结合第一段及全文内容可知，这篇文章主要讲述的是一个店主的塑料回收运动。 B Deep in the Pacific Ocean，an underwater “superhighway” stretches roughly 700 kilometers between the marine reserves of Ecuador's Galapagos Islands and Cocos Island， off the coast of Costa Rica. It's important to the sea life that moves back and forth between the islands. But the route is in danger since it is also open to fishing boats. To protect marine life， MigraMar， an environmental group， is working to change the entire “superhighway” into a marine protected area， an area that will stretch 240，000 square kilometers， about the size of the UK. For more than ten years， scientists of MigraMar have been trying to prove the importance of the “superhighway” by documenting the species that use it. They have placed satellite and ultrasonic tags (超声波追踪器) on almost 400 marine organisms to track their migratory routes (迁徙路线). So far， they have successfully tracked the migration of whale sharks， hammerhead sharks， silky sharks， etc.， between the two islands. MigraMar has produced a document stressing the need to protect the “superhighway”， calling for it to stop people from fishing there or allow only sustainable and seasonal fishing. The document has raised a storm of protest in the fishing industry in both countries. However， in the long term this protected “superhighway” will have a positive impact on fishing. Fish can grow and reproduce there， causing the overall amount to increase and more fish to become available outside the protected area.It could also have economic benefits in other industries.For example， preserving iconic sea life could protect tourism. Both Costa Rica and Ecuador are currently considering plans to protect the “superhighway”. They have mapped out a strategy to create and strengthen marine protected areas. “We're hopeful that action will be taken in the near future，” says Steiner， one of the founding members of MigraMar， but he also warns that some species are facing extinction. “We've taken baby steps，” he says， “but these species are in great danger.” 语篇解读：本文是一篇说明文，主要讲的是太平洋深处的一条重要水下“高速公路”正面临威胁，环保组织MigraMar正在努力将其转变为海洋保护区以保护海洋生物。 5．What do we know about the underwater “superhighway”？ A．It belongs to Costa Rica. B．It is under threat from boats. C．It is a land wildlife reserve. D．It is about the size of the UK. √ 解析：细节理解题。根据第一段“But the route is in danger since it is also open to fishing boats.”可知，水下“高速公路”受到船只的威胁。故选B。 6．Why do scientists track the migratory routes of many marine organisms？ A．To test the function of satellite and ultrasonic tags. B．To confirm the importance of the “superhighway”． C．To protect sharks migrating between the two islands. D．To stop people from fishing near the “superhighway”． √ 解析：推理判断题。根据第二段“For more than ten years ... track their migratory routes (迁徙路线)．”可知，科学家追踪许多海洋生物的迁徙路线是为了确认“高速公路”的重要性。故选B。 7．What does paragraph 3 focus on？ A．The benefits of protecting the “superhighway”． B．The strong protest from the fishing industry. C．The need of sustainable and seasonal fishing. D．The document of forbidding illegal fishing. √ 解析：段落大意题。根据第三段“However， in the long term ... could protect tourism.”可知，第三段主要是关于保护“高速公路”的好处。故选A。 8．What can we infer from Steiner's words？ A．Marine reserves are created. B．The “superhighway” is safe. C．Many species have died out. D．Governments need to act fast. √ 解析：推理判断题。根据倒数第二段“We're hopeful that action will be taken in the near future”和最后一段的内容可知，我们能从Steiner的话中推断出政府需要迅速采取行动。故选D。 Ⅱ.阅读七选五 The world is losing monarch butterflies at a striking rate，as various kinds of human activities destroy natural habitats. ____ Climate change，with its extreme storms，prolonged droughts and warming temperatures， is to destroy the forest that serves as the butterfly's winter home. 9 Scientists believe，to help these lovely butterflies，it is necessary to create an ecosystem where the butterflies will be able to survive.They've decided to start a monumental project. ____ “It's an idea that may sound crazy，” said Cuauhtemoc Saenz-Romero， a forest geneticist.“But by the end of the century，it may be absolutely needed.” 10 The butterflies seek shelter here in the oyamel firs (冷杉) in winter. ____ The firs protect the butterflies from chilly winter rains and create a microclimate cold enough to keep the butterflies in a state of hibernation (冬眠) but not so cold as to kill them. ___ The region is warming at such an accelerated pace that the trees won't be able to adapt， scientists say， and will need help migrating to areas where the climate is predicted to be suitable for them in future years. 11 12 Over the last several years，the team of researchers has overseen the relocation of about 1，000 young fir plants， which were growing at lower altitudes， up to higher — and cooler — elevations. ____ They are now establishing the trees at even higher altitudes on other nearby mountains — seeding ecosystems now that monarchs could potentially use later if temperatures continue to rise. 13 Every winter is witnessing tens of thousands of butterflies in the new forests， some fluttering about and others resting in massive clumps on the firs，their bodies obscuring the branches and trunks. A．They hope to expand the project. B．There is still hope to restore the forests. C．Their dense tops act as an umbrella for the butterflies. D．But the biggest threat yet has only recently come into focus. E．They are trying to move an entire forest 1，000 feet up a mountain. F．Scientists fear that climate change may kill off these firs altogether. G．The project is believed to protect the butterfly and the natives as well. 语篇解读：本文是一篇说明文。文章主要介绍了人类为保护因气候变化而正在消失的帝王蝶所做出的努力。 9．选D　上文提到了人类活动导致帝王蝶正在消失，后文则重点指出气候变化对蝴蝶的影响，可见空处与上文构成转折关系，旨在说明对帝王蝶的最大威胁是气候变化。D选项“但是最大的威胁直到最近才成为焦点”符合语境，下文是对这个威胁的具体说明。 10．选E　上文提到科学家决定开始一项浩大的工程，空处为本段最后一句，应承接上文说明这一工程是什么。E选项“他们试图将整片森林移到1 000英尺高的山上”符合语境，选项中They指代上文Scientists。 11．选C　上文提到蝴蝶在冷杉中寻求庇护，后文则提到了冷杉是如何保护蝴蝶的，C选项“它们浓密的顶部就像蝴蝶的伞”符合语境，选项中umbrella呼应上文中shelter。 12．选F　后文提到“科学家指出树木无法适应气候变化，需要帮助它们迁移”，可见气候变化可能对冷杉造成消极影响，故F选项“科学家们担心气候变化可能会使这些冷杉全部灭绝”符合语境。 13．选A　上文提到冷杉幼苗由低海拔地区移到海拔较高的地区，后文则提到研究小组在海拔更高的山上种植这些树，即他们在做进一步实验，A选项“他们希望扩大这个项目”符合语境。 本课结束 更多精彩内容请登录：www.zghkt.cn $