选修2 Unit 5 A delicate world（课件PPT）-【金版新学案】2027年高考英语高三总复习大一轮复习讲义（外研版）

该高中英语高考复习课件聚焦外研版选择性必修第三册Unit 5，覆盖词汇、语法、阅读、写作等高考核心考点，依据高考评价体系整合2023-2025年全国卷真题，分析词汇熟词生义（如trap“吸收”、appetite“需求”）、句型公式（what引导名词性从句）等高频考点分布，归纳阅读理解七选五、应用文写作等常考题型，体现备考针对性与实用性。 课件亮点在于“真题精讲+技巧建模+素养提升”，如通过trap和owe的用法对比训练突破词汇语境运用，结合what引导名词性从句构建语法思维模型，培养学生语言能力与思维品质。应用文写作提供“问题-措施-呼吁”框架，读后续写积累“看”类动作描写语料，助力学生掌握答题技巧，教师可据此实施精准复习，提升备考效率。

高三一轮复习讲义 外研版 选择性必修　第二册 Unit 5　A delicate world 03 核心知识巩固 02 探究必备知识 语基自主学习 01 内容索引 04 提升关键能力 05 单元测评 04 提升关键能力 语基自主学习 返回 1．inhabitant n.　　　　　 栖居的动物 2．penguin n. 企鹅 3．habitat n. 栖息地 4．rat n. 大老鼠 5．vegetation n. 植物，草木(总称) 6．erosion n. 侵蚀 7．parakeet n. 长尾(小)鹦鹉 8．immunity n. 免疫力 9．postscript n. 附言 注： 表示熟词生义； 表示反义词 Ⅰ.阅读单词 10．pest n. 有害小动物；害虫 11．nutrient n. 养分，营养物 12．herbal adj. 用香(药)草制成的 13．fossil n. 化石 14．floral adj. 花的 15．vertebrate n. 脊椎动物 16．beehive n. 蜂房，蜂箱 17．subsequently adv. 后来，随后 18．intervention n. 干预，介入 19．dissolve v. (使)溶解 20．thrive v. 茁壮成长 21．heritage n. 遗产；传统 22．chaos n. 大混乱；紊乱 23．virus n. 病毒 24．criterion n. 标准，准则 25．conservation n. 保护 26．prosper v. 兴旺，发达 1．halfway adj. 中间的，半途的 2．appetite n. 胃口，食欲 3．decrease v. (使)变小，(使)减少 4．trap n. 夹子，陷阱 5．collapse v. 倒坍；塌下 6．incident n. 事件 7．owe v. 应该做；对……负有……的义务 8．ecology n. 生态 9．session n. 一段时间 10．status n. 地位；身份 Ⅱ.核心单词 11．rare adj. 稀有的，罕见的 12．apparently adv. 据说；看来，似乎；显然 13．vast adj. 巨大的；广大的 14．altitude n. 海拔(高度) 15．elsewhere adv. 在别处 1．compare v．比较，对比 →comparison n．比较 →comparative adj. 比较的，相比的n. 比较级；对手 2．greet v．欢迎；打招呼 →greeting n．问候，招呼 3．invade v．侵略；涌入 →invasion n．涌入 →invader n．侵略者 Ⅲ.拓展单词 4．endanger v．危害；使遭危险 →endangered adj.濒临灭绝的 →danger n．危险；危害 →dangerous adj.有危险的；不安全的 5．depart v．离开；起程 →departure n．离开 6．vary v．变化；不同 →variation n．差异；变化 →variety n．不同种类；变化 →various adj.各种各样的 7．exist v．存在 →existence n．存在 →existing adj.现存的；现有的 →coexist v．共存，共处 8．explode v．突然增加 →explosion n．爆炸 →explosive adj.爆炸性的； (局势)一触即发的 9．substance n．物质；主旨，重要性 →substantial adj.实质性的，重要的； 大量的，多的 →substantially adv. 非常；基本上 10．visual adj.视觉的 →visually adv.看得见地 →visualize v．使形象化；想象 11．nutrient n．养分，营养物 →nutritious adj.有营养的；营养丰富的 →nutrition n．营养；滋养 12．drama n．戏剧 →dramatic adj.戏剧性的 →dramatically adv.显著地； 急剧地 13．mystery n．神秘的事情 →mysterious adj.神秘的 14．secure adj.安全的；稳固的 →security n．保护措施；保证 →securely adv.安全地 15．multiple adj.数量多的；多种多样的 →multiply v．(使)大大增加，(使)倍增 16．biology n．生物学 →biological adj. 生物的，与生物有关的 →biologist n．生物学家 构词法：名词后加后缀­y变为形容词，表示天气、环境、特点等。 ①mist薄雾→misty有雾的　wind风→windy有风的　rain雨→rainy下雨的　fog雾→foggy有雾的 cloud云→cloudy多云的　 ②dirt泥土→dirty脏的　hand手→handy便利的　thirst口渴→thirsty口渴的　health健康→healthy健康的　dust灰尘→dusty布满灰尘的 1．be introduced to 被引进到……，被介绍给…… 2．fail to do sth 未做到某事 3．develop an appetite for 对……产生兴趣 4．remove...from... 把……从……移走；把……从……去除；把……从……免职 5．decrease from...to... 从……减少到…… 6．turn out 原来是，证明是，结果是 7．owe...to... 把……归功于……；欠…… 8．coexist with 和……共存；与……共处 9．a substantial number of 大量的 10．in harmony with 与……协调，与……一致，与……和睦相处 Ⅳ.重点短语 11．out of control 失去控制 12．in consequence 结果，因此 13．on behalf of 代表 14．once and for all 一劳永逸 1．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 habitat for thousands of years.(否定副词位于句首引起的倒装) 他们也不会想不到，几千年来，这里栖居的动物，包括皇家企鹅、帝企鹅和海象，是如何与它们的自然栖息地和谐共存的。 2．This incident made it clear that the rat，mouse and rabbit problem needed solving once and for all.(it作形式宾语，that引导宾语从句) 这一事件表明，大鼠、老鼠、兔子问题需要一劳永逸地解决。 Ⅴ.经典句型 3．Although endangered elsewhere in China due to the invasion of foreign species，the bees of Shennongjia have coexisted with the local people for centuries.(状语从句的省略) 虽然在中国的其他地区，由于外来物种入侵，神农架的这种蜜蜂濒临灭绝，但是这种蜜蜂和当地的人们已经共存了几个世纪。 探究必备知识 返回 trap(教材义)n.夹子，陷阱；(补充义)n.圈套；牢笼，困境v．设陷阱捕捉；使陷于(尤指危险之地) 先练透 ①(2025·全国一卷)The way they demonstrated how microplastics ___________ (trap)through the boiling process was nice... ②(2025·全国一卷)What determines the effectiveness of ______________(trap) microplastics in water? ③(应用文写作之求助信)我读英语时，经常被一些不认识的单词难住，所以您能帮我个忙吗？ __________________________________ when reading English.So could you please do me a favor? 1 were trapped trapping I'm often trapped in some new words (1)trap sb into(doing)sth　 使某人陷入(做)某事的圈套；使某人中计 (2)be/get trapped in... 被困在……中 (3)fall into the trap of doing sth 落入做某事的圈套 再归纳 owe(教材义)v．应该做；对……负有……的义务；(补充义)v．欠(钱)；欠(人情)，应该感激；归因于 先练透 ①Bernard ____ (owe)it to the kind family that he could earn some money to help support his poor family. ②(应用文写作之人物描写)当被问到他成功的秘诀时，这位伟大的科学家说他的成功和幸福很大程度上要归功于他对祖国和家人深深的爱。 When asked about the secret of his success，this great scientist said that he _________________________________________________ for the country and his family. 2 owed owed much of his success and happiness to his deep love ③(中国元素)由于其丰富的文化遗产和多样的景观，中国已成为越来越受世界各地游客欢迎的目的地。 ____________________________ and diverse landscapes，China has become an increasingly popular destination for tourists from around the world. Owing to its rich cultural heritage (1)owe sb sth＝owe sth to sb 欠某人某物 (2)owe...to... 把……归功于…… (3)owe it to sb that... 多亏某人…… (4)owing to 因为；由于 再归纳 句型公式：what引导的名词性从句 先练透 ①(2025·全国二卷)It's about problem­solving around ____________________ _____________(拥有完整的人生意味着什么). ②(2025·全国一卷)Do we really recognise ________________ (我们付出的代价是什么)as a society when children can't move safely around our communities? ③(2024·浙江1月卷)几分钟前对她来说似乎是一项挑战性的任务，现在已经完成了。 ________________________________________________________ was now accomplished. 3 what it means to have a full life what it costs us What had seemed to be a challenging task to her minutes before ④(读后续写之主旨升华句)决心和坚持是你征服恐惧和实现目标所需要的。 Determination and perseverance are __________________________________ and accomplish your goal. what it takes to conquer your fear (1)what引导名词性从句时，在从句中可作主语、表语、宾语和定语等。 (2)what引导名词性从句，可表示“……的事情或东西；……的样子；所……的地方”等。 (3)that引导名词性从句，在从句中不作任何成分，只起连接作用。 再归纳 核心知识巩固 返回 维度一　词汇语境运用 Ⅰ.单句语法填空 1．(2025·全国二卷)Plants can improve our state of mind in a few ways but the biggest is by __________ (decrease)our level of cortisol，the stress hormone(激素) in our body. 2．(2024·新课标Ⅰ卷)Habitat Restoration Team volunteers play a vital role in restoring sensitive resources and protecting __________ (endanger)species across the ridges and valleys. 3．(2023·浙江1月卷)All camp ________ (session)are created with age­appropriate activities that are tailored to the multiple ways that kids learn. decreasing endangered sessions 4．(2023·浙江1月卷)I parked my car outside the farm and walked past a milking house which had __________ (apparent)not been used in many years. 5．(2024·新课标Ⅰ卷)I touched down in Vienna just 30 minutes before the _________ (depart)of the last bus to Prague. apparently departure Ⅱ.语篇语境填空 In 1.__________(compare) with the past，people's awareness has been improved 2.____________(dramatic)and the conservation areas are becoming larger，3._____ makes the number of animals multiply.Besides，owing 4.__ the substantial intervention of the government，effective measures 5.______ ____________ (take)to protect the ecology and keep the 6.__________(biology) balance.Apparently，all the efforts are rewarding.More laws which protect the number of animals from 7.__________(decrease) come into effect，leading to harmonious coexistence between mankind 8.___ animals.However，to protect the 9.__________(endanger)rare animals and decrease the spread of infectious 10.________(virus)from wild animals，we need to keep humans from invading their habitats and establish more natural reserves. comparison dramatically which to are/ have been taken biological decreasing and endangered viruses 维度二　阅读理解清障 Ⅰ.熟词生义/一词多义 (写出句中加黑词汇的词性及汉语意思) 1．(2025·全国二卷)...there was a 30% decrease in sick leave for people... _________ 2．(2023·新课标Ⅰ卷)Why can certain plants trap harmful bacteria(细菌)? _________ 3．There is an increasing appetite for organic food in the market _________ n．休假 v．吸收 n．需求 4．The population in the city has exploded in the past decade. ____________ 5．Afterwards，she and her father secured their first business meeting with a supermarket owner，who finally agreed to sell Moore's product—CanCandy. _______________________________ v．激增 v．(尤指经过努力)获得，取得 Ⅱ.构词训练 (写出下列黑体词的构词方法和词义) 构词 规则 dis­前缀表示”否定，相反”，添加在形容词、动词或名词前，使该词表达与原词相反或否定的意思。 1．(2025·全国二卷)“I feel like it is a disservice to the kids，”Ho says. ___­_______________________________________ 2．(2025·全国二卷)She'd been struggling with eating disorders and health issues，which ultimately led her to getting surgery. ___­_______________________________________________________ 3．(2025·全国二卷)This approach spared me the discomfort of having to over­explain. ___­_______________________________________________________ dis­相反＋service n．服务→disservice n．帮倒忙 dis­没有，相反的＋order n．秩序→disorder n．混乱，杂乱 dis­不，相反＋comfort n．安慰→discomfort n．不适，不安 提升关键能力 返回 Part 1.应用文增分练 请结合本单元话题，用单元词汇句型完成下面的应用文写作，并背诵。 【情境呈现】 假设你是李华，每年3月3日是世界动植物日，为此英语老师组织大家开展了关于保护野生动物的主题演讲，请代表你所在的小组作一个主题发言。内容要点：(1)目前存在的问题或现象；(2)采取的措施；(3)你的看法。 注意：1.写作词数应为80左右；2.请按如下格式作答。 Dear students， ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Thank you. 【布局谋篇】 首段 开篇提出 问题 Dear students， Many endangered wild animals are ①______________________ __________________________________(由于人类活动而面临灭绝的危险).To make them have a secure habitat，the following measures should be taken. 中段 说明解决 方案理由 　　Firstly，pollution criteria should be made to decrease poisons in the air.Secondly，②_____________________________________(为了与自然和谐相处)，national parks should be regarded as wild animals' reserves. 末段 总结呼吁 　　Let's make contributions to protecting wild animals so that we can coexist with nature. Thank you. facing the danger of dying out owing to human activities in order to be in harmony with nature 【多元表达】 试用倒装句型改写本句：Let's make contributions to protecting wild animals so that we can coexist with nature. ③______________________________________________________________ ________________________ Only by making contributions to protecting wild animals can we coexist with nature. Part 2.读后续写提能练 拓展语料积累　动作描写之“看”(一) 【语言素材】 注意到 ①notice　　　　　注意到；　　 ②observe　　　 注意到；观察到；　　 ③spot 看见；注意到； ④set/lay eyes on 注意到； ⑤catch one's eye 引起某人的注意 看到/ 看见 ①scan　　　　　　细看；察看，端详；浏览；　　 ②look at　　　　　看； ③see 看见； ④one's eyes fall on 看到/目光落在……； ⑤catch sight of 看见； ⑥take a look at 看一下； ⑦look up at 抬头看； ⑧look down at 低头看； ⑨come into one's view 映入眼帘 注视/凝 视/盯 ①eye　　　　　　　　　 注视；盯着；　　　 ②watch　　　　　　　　　 注视； ③stare at 盯着看；凝视； ④gaze at 凝视；注视； ⑤fix/focus one's eyes on 注视； ⑥one's eyes linger on 目光停留在；注视着； ⑦fasten one's gaze on 盯着； ⑧lock one's eyes on 盯着； ⑨have one's eyes on 盯着； ⑩have/keep one's eyes fixed on 盯着； ⑪fix unblinkingly on 目不转睛地盯着； ⑫one's eyes be glued to 目不转睛地盯着 【靓句表达】 1．The road was so slippery that I tried to keep my eyes glued to it.路太滑了，我尽量让眼睛紧盯着路面。 2．Again he cast a look toward the window，and saw an excited face against the glass. 他又朝窗户看了一眼，看见一张激动的脸靠在玻璃上。 3．The boy glared around the house as if expecting a challenge.男孩瞪着眼睛环视房子，好像在等待挑战。 4．Swallowing hard，I stared into her eyes for a moment，wondering how to cope with the annoying situation. 我忍气吞声，盯着她的眼睛看了一会儿，想知道如何应对这种烦人的情况。 5．As the rescue team approached the collapsed building, their eyes were glued to every corner，hoping to spot signs of survivors. 救援队靠近坍塌的大楼时，目光紧盯着每一个角落，盼着能发现幸存者的踪迹。 6．As we walked along the quiet street at dusk，our eyes fell on an old man sitting on a bench, playing the violin. 黄昏时分，我们沿着安静的街道散步，目光落在了长椅上坐着的一位老人身上，他正拉着小提琴。 7．She sat on the bench, looking down at the book in her hands, so she didn't notice when I walked over. 她坐在长椅上，低头看着手里的书，所以我走过去时她都没注意到。 8．He lay on his stomach on the lawn, gazing at the twinkling stars in the night sky, lost in thoughts of his future.他趴在草坪上，凝视着夜空中闪烁的星星，沉浸在对未来的畅想中。 续写语料运用　用表“看”的表达补全下面的微场景并背诵 微场景：主题“画展偶遇”——观展时的“看、望、凝” 　　As the afternoon sunlight streamed through the gallery windows，Lila wandered past the oil paintings，①___________________(瞥一眼) each canvas casually. Suddenly，her steps slowed—②________________(目光落在) a familiar landscape painting in the corner. She stared at the brushstrokes for a long moment，recognizing the style at once. Just then，a man behind her ③_________________(注视着) the same painting and murmured，“This is my mother's work.” Lila ④______________(看向) him in surprise，and ⑤______________________(目光停留在) each other for a second—it turns out he was the artist's son，whom she'd met years ago at an art lecture. casting a glance at her eyes fell on fixed his eyes on glanced at their eyes lingered on 单元测评29　Unit 5　A delicate world 返回 Ⅰ.阅读理解(本题共8个小题，每小题2.5分，共20分) A Walking home from school, I am enjoying my day.Each day I stop to hear music coming from the ivy (常春藤).Sparrow (麻雀) song, a loud glorious sound.The ivy is pulsing below a leafless tree, decorating around the lower trunk like a celebration.Nervous flittings, in and out, pecking at the branches.This ivy is a home for them, harboring an entire flock.But this scene is no longer ubiquitous．Numbers have declined by almost 70% in the UK since 1970.Sparrows make their homes near human places and finding a tree like this is a blessing.Happily, the ivy is still full of chatter and twitter. In Greek mythology, sparrows are sacred and often associated with the goddess Aphrodite, symbolizing true love and spiritual connection.I wonder how many people look at sparrows and feel that depth of connection.All birds live brightly in our imagination, connecting us to the natural world, opening up all kinds of creativity. As I stand there, fluffed­up sparrows in conversation among themselves, there is a spark.Noticing nature is the start of it all.Slow down to listen, to watch.Take the time, despite mountains of homework. Take the time to observe nature, to immerse oneself in its patterns, structures, happenings and rhythms.It is how mathematicians and scientists are nurtured.Alan Turing studied the patterns in nature：the arrangement of petals on the flower, spots on a leopard and stripes on a zebra.He was looking for a mathematical formula (公式) for the development of cells in living things.Nature sparks creativity.All we have to do is start with the question, why? The way my mind whirrs and whirls in nature, or even when“daydreaming” is way more productive than the work I do in school. I consolidate myself by thinking and thinking while intensely watching the movements of sparrows.Who knows where watching sparrows will lead? 【语篇解读】　本文是一篇记叙文。主要讲述了作者放学回家路上观察麻雀的经历。 1．What do I do on the way home from school? A．Listen to pop music. B．Decorate the tree. C．Clean up the trunk. D．Observe the sparrows. 细节理解题。根据第一段中“Each day I stop to hear music coming from the ivy (常春藤)...in and out, pecking at the branches.”可知，作者在放学回家的路上会观察麻雀。故选D项。 √ 2．What does the underlined word“ubiquitous”in paragraph 1 probably mean?　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 A．Unusual. B．Delightful. C．Common. D．Horrible. 词义猜测题。根据第一段中“This ivy is a home for them, harboring an entire flock.”以及“Numbers have declined by almost 70% in the UK since 1970.Sparrows make their homes near human places and finding a tree like this is a blessing.”可知，此处为这种场景已不再随处可见。故可猜测画线单词ubiquitous为“随处可见的”的意思，和C选项Common“常见的”意思一致。故选C项。 √ 3．What is the author's purpose in mentioning Greek mythology? A．To show the imagination of humans. B．To stress the significance of sparrows. C．To introduce the power of Aphrodite. D．To demonstrate the diversity of species. 推理判断题。根据第二段“In Greek mythology...connecting us to the natural world, opening up all kinds of creativity.”可推知，作者提到希腊神话的目的是强调麻雀的重要性。故选B项。 √ 4．What can we learn from paragraph 4 of the text? A．Nature facilitates cell development. B．Nature follows rigid patterns. C．Nature is a source of inspiration. D．Nature offers companionship. 推理判断题。根据第四段中“Take the time to observe nature，...Nature sparks creativity.”可推知，我们能从第四段中了解到自然是灵感的源泉。故选C项。 √ B North America's monarch butterfly, whose showy looks and extraordinary migration have made it one of the continent's most beloved insects, has been classified as endangered by the International Union for Conservation of Nature (IUCN), the world's most comprehensive scientific authority on the status of species. The decision comes after decades of falling populations driven by losses in the plants they need as caterpillars and in the forests where adults spend the winter, combined with climate change, the assessment found. “It's been so sad to watch their numbers decline so much, so anything that might help them makes me happy, and I think that this designation might help them，”said Karen Oberhauser, a conservation biologist at the University of Wisconsin who has studied monarchs for more than 35 years and contributed to the assessment. The numbers of Western monarchs, which live west of the Rocky Mountains, plummeted by an estimated 99.9 percent between the 1980s and 2021.While they rebounded somewhat this year, they remain in great peril.In 2020, U．S.wildlife officials found that monarchs were threatened with extinction but declined to add them to the endangered species list because they said conservation of other species took priority. Monarch caterpillars depend on milkweed (马利筋), the only plants they can eat.After leaving their overwintering grounds, which for most monarchs are concentrated in just a few hectares of forest in central Mexico, females deposit eggs on milkweed plants from Texas to as far north as Canada in a multi­generational journey. Habitat destruction in those Mexican forests was an early threat, said Anna Walker, an entomologist (昆虫学家) with the New Mexico BioPark Society who led the assessment.The Mexican government stepped in, creating a reserve in 1986 and expanding it in 2000.While concerns remain over illegal logging (伐木) and disease, that conservation work has helped, she said, preventing the loss of overwintering habitat quite effectively. 【语篇解读】　本文是一篇说明文。本文谈及北美帝王蝶减少的现象、原因及保护措施等。 5．Why is monarch butterfly declining? A．The reduction of forests. B．The step­in of government. C．The lower survival rate of eggs. D．The expansion of habitats. 细节理解题。根据文章第2段首句中的“由于毛毛虫所需的植物和成虫过冬的森林的减少(driven by losses in the plants...and in the forests)，加上气候变化，导致了帝王蝶几十年的数量下降(falling populations)”可知，A项“森林数量的减少”符合题意。A项中的reduction是原文中losses的同义替换。 √ 6．What is Karen's attitude towards IUCN's decision? A．Opposed. B．Delighted. C．Distressed. D．Surprised. 观点态度题。由关键词Karen定位到文章第3段。第3段第1句凯伦提到任何可能帮助帝王蝶的事情都能让他高兴(makes me happy)，而他认为将帝王蝶列为濒危物种(this designation)能够帮助帝王蝶。由此可推论，凯伦对IUCN将帝王蝶列为濒危物种的决定感到高兴，故B项delighted“高兴的”符合题意。 √ 7．Why did U.S.wildlife officials refuse to list monarchs as endangered in 2020? A．Because the officials didn't see the value of monarch butterfly. B．Because the officials didn't realize the threat on the butterfly. C．Because the officials failed to perform their own duties. D．Because the officials put more emphasis on other endangered species. 细节理解题。根据题干关键词U.S.wildlife officials可以定位到文章的第4段最后一句。句中美国野生动物官员提到这么做是因为要优先保护其他物种(conservation of other species took priority)。故D项“因为官员们更加重视其他濒危物种”符合题意。 √ 8．How can we evaluate the protection made by Mexican government? A．Hard and painful. B．Effective yet objected. C．Committed yet sad. D．Positive and fruitful. 推理判断题。根据题干关键信息Mexican government可以定位到文章的尾段最后两句。尾段最后一句提到，尽管可能还存在非法砍伐和帝王蝶染病的问题，但保护工作(the conservation work)已经有效帮助(helped)阻止了越冬栖息地的丧失。由此可知，保护工作起到了积极作用，颇有成效，故D项“积极而有效的”符合题意。 √ Ⅱ.阅读七选五(本题共5个小题，每小题2.5分，共12.5分) As the seasons are starting to change around the world, the animal kingdom is on the move.Animal migration is one of nature's great wonders, but how do animals know when it is time to set off on their journey, or where they need to go? Once they've worked out their destination, how do they know how to get there? 1( ). Migration is a behavioral pattern where animals travel from one habitat to another in search of something.It happens seasonally, and usually involves a return journey.These journeys can be by land, sea or air.2( ).Animals like gazelles, wildebeests and zebras migrate in huge herds during dry seasons to look for fresh grass to eat and water to drink. Animals also migrate because of the weather.Around 50 bird species leave the UK each winter to avoid the cold.3( ).They're either searching for a mate, looking for somewhere to lay their eggs or finding the best place to raise their young.For example, humpback whales travel to warmer waters each winter to raise their calves. 4( ), but how do they know when it is time to head off? For those who migrate to look for something to eat, scientists think shortages of food could be a sign that it's time to begin their journey.Others might be able to recognize when winter is coming because they can see that the days are getting shorter. So how do they know where to go? Some use the stars and the sun to help them navigate while others rely on landmarks like rivers and mountains to show them where they are.5( ).Wildebeests are thought to follow the smell of rain. A．Below are some ways they get there B．Animals have their reasons for migrating C．Scientists have been puzzled by these questions for many years D．It's also possible for animals to sniff their way to their destination E．Some birds travel to the UK to escape extreme cold further north F．One of the main reasons behind animal migration is the search for food G．For some animals, it's the need to reproduce that sends them on their journey 【语篇解读】　本文是一篇说明文。文章主要解释了动物迁移这一行为相关的问题。 As the seasons are starting to change around the world, the animal kingdom is on the move.Animal migration is one of nature's great wonders, but how do animals know when it is time to set off on their journey, or where they need to go? Once they've worked out their destination, how do they know how to get there? 1( ). 根据空前“Animal migration is one of nature's great wonders, but how do animals know when it is time to set off on their journey, or where they need to go? Once they've worked out their destination, how do they know how to get there？”可知，空前提出了一系列与动物迁徙相关的问题，故C项“科学家被这些问题困扰了很多年。”符合，C项中的“these questions”指代空前提出的这几个问题，故选C项。 C．Scientists have been puzzled by these questions for many years Migration is a behavioral pattern where animals travel from one habitat to another in search of something.It happens seasonally, and usually involves a return journey.These journeys can be by land, sea or air.2( ).Animals like gazelles, wildebeests and zebras migrate in huge herds during dry seasons to look for fresh grass to eat and water to drink. 根据空后“Animals like gazelles, wildebeests and zebras migrate in huge herds during dry seasons to look for fresh grass to eat and water to drink.”可知，空后提到了瞪羚、角马和斑马等动物在旱季成群结队地迁徙，寻找新鲜的草吃和水喝，它们迁徙的目的是为了寻找食物和水源，故F项“动物迁徙的其中一个重要的原因在于寻找食物。”符合，故选F项。 F．One of the main reasons behind animal migration is the search for food Animals also migrate because of the weather.Around 50 bird species leave the UK each winter to avoid the cold.3( ).They're either searching for a mate, looking for somewhere to lay their eggs or finding the best place to raise their young.For example, humpback whales travel to warmer waters each winter to raise their calves. G．For some animals, it's the need to reproduce that sends them on their journey 根据空后“They're either searching for a mate, looking for somewhere to lay their eggs or finding the best place to raise their young.For example, humpback whales travel to warmer waters each winter to raise their calves.”可知，空后提出它们迁徙是为了寻找配偶，或者寻找产卵的地方，或者寻找养育幼崽的最佳地点，故G项“对于一些动物，是繁殖的需求让它们踏上了旅程。”符合，繁殖的需求让一些动物踏上了旅程，它们要么是在寻找配偶，要么在寻找产卵的地方，要么寻找养育幼崽的最佳地点，故选G项。 4( ), but how do they know when it is time to head off? For those who migrate to look for something to eat, scientists think shortages of food could be a sign that it's time to begin their journey.Others might be able to recognize when winter is coming because they can see that the days are getting shorter. 根据空后“but how do they know when it is time to head off？”可知，空后提出了另外一个问题，什么时候出发，且前文一直在解释动物迁徙的原因，故B项“动物有它们迁徙的理由。”符合，承上启下，总结前文分析的原因，并引出后文迁徙的时间，故选B项。 B．Animals have their reasons for migrating So how do they know where to go? Some use the stars and the sun to help them navigate while others rely on landmarks like rivers and mountains to show them where they are.5( ).Wildebeests are thought to follow the smell of rain. 根据空前空后句子可知，两句都提出了一些动物如何知道自己该去哪里的方法，故D项“动物也有可能通过嗅觉来到达目的地。”符合语境，即空前提出一些动物通过地标和星星、太阳来帮助自己导航，而空后则具体举例角马是靠着闻雨水的味道，故D项引出后文，通过嗅觉来导航，故选D项。 D．It's also possible for animals to sniff their way to their destination 谢 谢 观 看 WELCOME UNIT $