Unit 5 A delicate world 同步检测学案 -2026-2027学年高中英语外研版选择性必修第二册

该高中英语学案聚焦外研版选择性必修第二册Unit 5 “A delicate world”主题，整合核心词汇、短语、语法（It作形式宾语）及语篇应用等核心知识点。通过教材语境改编练习搭建从词汇到语篇的学习支架，衔接生态保护主题与语言技能，助力学生系统掌握单元语言知识。 资料亮点在于语境化与迁移应用结合，通过词汇短语的教材语境训练、语篇填空与理解提升语言能力，语法练习与高考应用文写作培养思维品质和学习能力，帮助学生巩固知识、形成生态保护意识，高效对接高考需求，提升综合语言运用能力。

外研版高中英语选择性必修第二册 Unit 5 A delicate world 同步检测学案 班级：________________ 姓名：________________ A. 核心词汇 学科网（北京）股份有限公司 1.显著地 adv.________________ 2.栖息地 n.________________ 3.后来，随后 adv.________________ 4.胃口，食欲 n.________________ 5.繁殖；（使）大大增加，（使）倍增 v.________________ 6.大混乱；紊乱 n.________________ 7.保护 n.________________ 8.病毒 n.________________ 9.（使）变小，（使）减少 v.________________ 10.夹子，陷阱 n.________________ 11.离开 n.________________ 12.突然增加 v.________________ 13.倒坍；塌下 v.________________ 14.大量的，多的 adj.________________ 15.事件 n.________________ 16.干预，介入 n.________________ 17.应该做；对……负有……的义务 v.________________ 18.生态 n.________________ 19.养分，营养物 n.________________ 20.比较 n.________________ 21.visual adj.________________ 22.session n.________________ 23.criterion n.________________ 24.rare adj.________________ 25.biological adj.________________ 26.apparently adv.________________ 27.vast adj.________________ 28.variation n.________________ 29.elsewhere adv.________________ 30.secure adj.________________ B. 词汇语境化训练 Contextual Vocabulary Practice 用括号内词的正确形式完成句子。注意词性转换、单复数、时态和固定搭配。 1. [教材语境改编] The green grass and bare rock of its landscape contrast __________, giving it a wild and natural beauty. (dramatically) 2. [教材语境改编] Nor would they fail to imagine how its native inhabitants, including royal penguins, king penguins, and elephant seals, existed in perfect harmony with their natural __________ for thousands of years. But the island’s more recent history tells a different story. (habitat) 3. [教材语境改编] Loose on the island, they did what rabbits do best – they __________ rapidly and began eating the native vegetation and digging holes, which caused soil erosion. (multiply) 4. [教材语境改编] But although the __________ caused the rabbit population to decrease from 130,000 to around 10,000, it also meant less food for the cats. (virus) 5. [教材语境改编] In the 1980s, __________ and dogs were used to catch the cats. (trap) 6. [教材语境改编] The last Macquarie Island cat was caught in 2000. But as the saying goes, “While the cat’s away, the mice will play.” With the __________ of the cats from the island, the mouse and rat population started to increase. (departure) C. 一词多义与构词 Word Families 写出合适的同根词。 1. conserve (v.) → ______ (n.) → ______ (n. 人) 2. compare (v.) → ______ (n.) → ______ (adj.) 3. intervene (v.) → ______ (n.) → ______ (adj.) 4. mystery (n.) → ______ (adj.) → ______ (adv.) 5. ecology (n.) → ______ (adj.) → ______ (adv.) A. 中译英：Chinese → English 1.代表______________ 2.弄清；查明______________ 3.以及；也______________ 4.为了______________ 5.根据______________ 6.能够______________ 7.由于______________ 8.多亏；由于______________ 9.more than______________ 10.take place______________ 11.contribute to______________ 12.refer to______________ 13.depend on______________ 14.rely on______________ 15.pay attention to______________ B. 短语语境化训练 Phrase Practice 从上面短语中选择恰当短语，并用其正确形式完成句子。 1. [教材/主题语境改编] It is my great pleasure to give a lecture here __________ the Be at One with Nature Association. 2 As we know, in 2016, Shennongjia made it onto the UNESCO World Heritage List. 2. [教材/主题语境改编] Secondary consumers prey on primary consumers, __________ eating other animal matter. 3. [教材/主题语境改编] Both verbal and visual information is used __________ maintain the audience’s interest. 4. [教材/主题语境改编] __________ official statistics, over 3,000 plant species have been recorded there. 5. [教材/主题语境改编] Although endangered elsewhere in China __________ the invasion of foreign species, the bees of Shennongjia have coexisted with the local people for centuries. 6. [教材/主题语境改编] __________ their efforts, the monkey’s population has doubled since the 1980s. C. 短语迁移运用 Phrase Application 1. [原创迁移] 我谨代表学校环保社团呼吁大家尊重脆弱生态系统。【on behalf of】 ________________________________________________________________________________________________ 2. [原创迁移] 科学干预只有建立在长期监测基础上，才可能真正有助于生态恢复。【contribute to】 ________________________________________________________________________________________________ 3. [原创迁移] 进入自然保护区时，游客尤其要注意不要把外来物种带入当地环境。【pay attention to】 ________________________________________________________________________________________________ A. 单元助记短文：语篇填空 Memory Passage 用括号内词的正确形式或恰当短语完成短文。 Data, examples and __________ (comparison) are then used to support the main ideas. Both verbal and __________ (visual) information is used __________ (in order to) maintain the audience’s interest. The end of a lecture is often followed by a short question-and- answer __________ (session). It contains a naturally-balanced environment that allows the many and various species to live and __________ (prosper). It is also one of the __________ (rare) locations in the world where scientists can observe in real time the ecological and __________ (biological) processes that occur as the plants and animals develop and evolve. 4 For the first __________ (criterion), Shennongjia is __________ (apparently) one of the most “complete” natural areas in the world. The region rises from about 400 metres to over 3,000 metres above sea level, giving it the name the “Roof of Central China”. The __________ (vast) range in altitude results in a great variation in climatic conditions. This allows a wide variety of species to thrive. B. 语篇理解 1. 该语段主要围绕“生态系统保护、生物多样性与自然平衡”中的哪一具体内容展开？请用不超过30个汉字概括。 ________________________________________________________________________________________________ ________________________________________________________________________________________________ 2. 根据语段，文本传递了怎样的态度、价值或学习启示？请用中文概括。 ________________________________________________________________________________________________ ________________________________________________________________________________________________ A. 语法要点：It as an empty object 语法学习提示：先判断句法功能和时间/逻辑关系，再选择结构；完成后检查主谓关系、语态和非谓语逻辑主语。 要点 讲解 例句 形式宾语 在 find/think/consider/make 等后，可用 it 作形式宾语，把真正宾语 to do/that 从句后置。 We find it important to protect fragile ecosystems. 结构 verb + it + adj./n. + to do/that... 常见于正式表达。 Technology makes it possible to monitor wildlife remotely. 易错点 it 不能随意删除，否则宾补与真正宾语的结构关系会变得不完整。 I think it necessary to act now. B. 单句练习 Sentence Practice 1. [单元/高考趋势改编] 完成句子：We find __________ important to protect the island’s ecosystem. ________________________________________________________________________________________________ 2. [单元/高考趋势改编] 改写：To remove invasive species was difficult for the team.（用 found it...） ________________________________________________________________________________________________ 3. [单元/高考趋势改编] 完成句子：New technology makes it possible __________ (monitor) wildlife with less disturbance. ________________________________________________________________________________________________ 4. [单元/高考趋势改编] 翻译：研究人员认为长期观察生态变化是必要的。 ________________________________________________________________________________________________ 5. [单元/高考趋势改编] 改正：We think important to limit visitor numbers in fragile areas. ________________________________________________________________________________________________ 6. [单元/高考趋势改编] 完成句子：The project made __________ clear that prevention was better than later repair. ________________________________________________________________________________________________ 7. [单元/高考趋势改编] 改写：The rules make protecting the habitat easier.（用 make it...） ________________________________________________________________________________________________ 8. [单元/高考趋势改编] 句型升格：The school values field study. ________________________________________________________________________________________________ C. 句型升格 Sentence Upgrading 1. [开放表达] 用 it 作形式宾语改写：We think protecting fragile ecosystems is important. ________________________________________________________________________________________________ 2. [开放表达] 用 it 作形式宾语升格：The project makes understanding the island’s ecology easier. ________________________________________________________________________________________________ A. 万能句型翻译 Useful Sentence Translation 1. [高考应用文表达] 脆弱生态系统中的一个外来物种可能改变整个食物网，因此干预必须谨慎。【invasive species; food web】 ________________________________________________________________________________________________ ________________________________________________________________________________________________ 2. [高考应用文表达] 生态恢复不是简单清除某种动物，而是重建多个物种之间的平衡。【not...but...; ecological balance】 ________________________________________________________________________________________________ ________________________________________________________________________________________________ 3. [高考应用文表达] 保护项目应依据长期监测数据调整，而不是依靠短期印象。【long-term monitoring; rather than】 ________________________________________________________________________________________________ ________________________________________________________________________________________________ 4. [高考应用文表达] 神农架的保护价值不仅在于珍稀物种，也在于完整生态系统及其科学意义。【not only...but also...; ecosystem】 ________________________________________________________________________________________________ ________________________________________________________________________________________________ 5. [高考应用文表达] 只有理解生态系统的相互联系，我们才能避免“解决一个问题却制造另一个问题”。【only by; interconnected】 ________________________________________________________________________________________________ ________________________________________________________________________________________________ B. 高考应用文写作 Practical Writing 假定你是校园自然讲座的学生主讲人，请围绕“Why Protect a Delicate Ecosystem?”写80-100词讲稿，包括生态系统特点、一个威胁和保护建议。 ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ 参考答案 第一部分 必备词汇 A. 核心词汇 1.显著地 adv. dramatically adv. 2.栖息地 n. habitat n. 3.后来，随后 adv. subsequently adv. 4.胃口，食欲 n. appetite n. 5.繁殖；（使）大大增加，（使）倍增 v. multiply v. 6.大混乱；紊乱 n. chaos n. 7.保护 n. conservation n. 8.病毒 n. virus n. 9.（使）变小，（使）减少 v. decrease v. 10.夹子，陷阱 n. trap n. 11.离开 n. departure n. 12.突然增加 v. explode v. 13.倒坍；塌下 v. collapse v. 14.大量的，多的 adj. substantial adj. 15.事件 n. incident n. 16.干预，介入 n. intervention n. 17.应该做；对……负有……的义务 v. owe v. 18.生态 n. ecology n. 19.养分，营养物 n. nutrient n. 20.比较 n. comparison n. 21.visual adj. 视觉的 22.session n. 一段时间 23.criterion n. 标准，准则 24.rare adj. 稀有的，罕见的 25.biological adj. 生物的，与生物有关的 26.apparently adv. 据说；看来，似乎 27.vast adj. 巨大的；广大的 28.variation n. 差异；变化 29.elsewhere adv. 在别处 30.secure adj. 稳固的；安全的 B. 词汇语境化训练： 1. dramatically 2. habitat 3. multiplied 4. virus 5. traps 6. departure C. 一词多义与构词： 1. conservation; conservationist 2. comparison; comparative 3. intervention; interventionist 4. mysterious; mysteriously 5. ecological; ecologically 第二部分 必备短语 A. 中译英及英译中： 1. on behalf of 2. find out 3. as well as 4. in order to 5. according to 6. be able to 7. due to 8. thanks to 9. 不仅仅；超过 10. 发生；举行 11. 有助于；促成 12. 提到；指的是 13. 依赖；取决于 14. 依赖 15. 注意 B. 短语语境化训练： 1. on behalf of 2. as well as 3. in order to 4. According to 5. due to 6. Thanks to C. 短语迁移运用： 1. On behalf of the school environmental club, I call on everyone to respect fragile ecosystems. 2. Scientific intervention can contribute to ecological recovery only when it is based on long-term monitoring. 3. When entering a nature reserve, visitors should pay particular attention to not introducing non-native species. 第三部分 单元助记短文 A. 语篇填空： 1. comparisons 2. visual 3. in order to 4. session 5. prosper 6. rare 7. biological 8. criterion 9. apparently 10. vast B. 语篇理解： 1. 语段围绕“生态系统保护、生物多样性与自然平衡”展开，概括时应包含语段中的核心对象、事件或观点。 参考答案：神农架因海拔跨度大而形成完整生态系统与丰富生物多样性。 2. 参考要点：根据语段呈现的事实或人物经历概括其态度、价值或学习启示；答案须有语段信息支撑。 参考答案：文本赞美了神农架独特的自然环境和科研价值，启示我们要珍惜和保护自然遗产，善用生态优势促进科学研究与可持续发展。 第四部分 语法要点与练习 B. 单句练习： 1. it 2. The team found it difficult to remove invasive species. 3. to monitor 4. Researchers consider it necessary to observe ecological changes over a long period. 5. think important → think it important 6. it 7. The rules make it easier to protect the habitat. 8. The school considers it important for students to understand ecosystems through field study. C. 句型升格（示例）： 1. We think it important to protect fragile ecosystems. 2. The project makes it easier to understand the island’s ecology. 第五部分 单元作文话题训练 A. 万能句型翻译： 1. A single invasive species can alter an entire food web in a fragile ecosystem, so intervention must be carefully planned. 2. Ecological restoration is not simply about removing one animal, but about rebuilding balance among many species. 3. Conservation projects should be adjusted according to long-term monitoring data rather than short-term impressions. 4. The value of protecting Shennongjia lies not only in rare species, but also in its complete ecosystem and scientific importance. 5. Only by understanding how ecosystems are interconnected can we avoid solving one problem while creating another. B. 高考应用文写作（参考范文）： Today I’d like to explain why a delicate ecosystem deserves careful protection. In such a system, plants, animals, soil and climate depend closely on one another. If an introduced species spreads too quickly or human activity damages a habitat, the effect can move through the whole food web. Protection therefore needs long-term monitoring, scientific planning and limits on harmful activities. Visitors can also help by following local rules and leaving no waste behind. Protecting one ecosystem means protecting the relationships that keep many forms of life alive. $