Unit 5 Revealing nature（复习课件）英语外研版选择性必修第一册

外研版·选择性必修第一册 Unit 5 Revealing nature 单元复习 Unit 5 Revealing nature 复习目标 知识图谱 考点串讲 单元语法 主题写作 综合训练 CONTNETS 1. 学生能够掌握本单元重点词汇，如seed, sample, suspect, ancestor, generate, characteristic, decline, blame, link, benefit等，并能在不同语境中正确运用。（重点掌握） 2. 学生能够理解并熟练运用过去完成时（had + 过去分词），表示"过去的过去"，区分其与一般过去时的用法。（语法重点） 3. 学生能够读懂关于达尔文进化论、生物多样性和植物交流的科普文本，提取关键信息并进行推理判断。（阅读能力） 4. 学生能够撰写格式规范、内容完整的观察日记，记录植物生长或自然现象的变化过程，恰当使用描写和议论。（写作能力） 5. 学生能够了解生物多样性和自然保护的重要性，培养科学探索精神和环保意识。（文化意识） 复习目标 Unit 5 Revealing nature 考点串讲 外研版·选择性必修第一册 知识图谱 过去完成时的构成 过去完成时的用法 单元语法 过去完成时vs一般过去时 2. 观察日记常用句式 3. 写一篇植物生长观察日记 主题写作 1. 阅读科普文本，理解生物进化阅读 generate characteristic 重点单词 decline evolve from play a role in 重点短语 be native to a variety of be to blame Revealing nature 考点串讲 重点词汇 单词 词形 意思 seed n. 种子，籽 distant adj. 遥远的 sample n./v. 样本；取样 suspect v. 猜想，怀疑 ancestor n. 祖先，原种 generate v. 产生，创造 characteristic n./adj. 特征；典型的 decline v./n. 减少；谢绝 blame v./n. 责怪；责任 link v./n. 联系；连接 考点串讲 重点词汇 单词 词形 意思 benefit v./n. 有益于；利益 evolve v. 进化，演变 encounter v. 偶然碰到 giant adj. 巨大的 primitive adj. 原始的，低等的 beak n. 鸟嘴，喙 finch n. 雀科鸣禽 tortoise n. 陆龟 disgrace n. 丢脸，耻辱 pesticide n. 杀虫剂，农药 考点串讲 词汇精讲 1. generate v. 产生，创造；生成 情景导学 The plants generate chemical signals to warn each other of danger from insects. 植物产生化学信号来互相警告来自昆虫的危险。 用法归纳 ①generate electricity/heat/power 发电/产生热量/产生动力 ②generate interest/ideas 产生兴趣/想法 ③generate a signal/response 产生信号/反应 ④be generated by... 由……产生 词汇拓展 generation n. 产生；一代人；代 a new generation of... 新一代的…… generator n. 发电机；发生器 generative adj. 能生产的；有生产力的 即时训练 1. The new method can ________ (generate) more electricity with less fuel. 2. The ________ (generate) of heat is a natural process in living things. generate generation 考点串讲 词汇精讲 2. characteristic n. 特征，特性 adj. 特有的，典型的 情景导学 The giant tortoise is one of the most distinctive characteristics of the Galapagos Islands. 巨型陆龟是加拉帕戈斯群岛最独特的特征之一。 用法归纳 ①a characteristic of... ……的特征 Long necks are a characteristic of giraffes. 长脖子是长颈鹿的特征。 ②be characteristic of... 是……的典型特征 This behavior is characteristic of the species. 这种行为是该物种的典型特征。 ③personal characteristics 个人特征 词汇拓展 character n. 性格；品质；角色；字符 characterize v. 以……为特征；描述 characterization n. 描述；人物塑造 即时训练 1. The ability to adapt is a key ________ (characteristic) of living organisms. 2. Warm colors are ________ (character) of his painting style. characteristic characteristic 考点串讲 词汇精讲 3. decline v. 减少，下降；衰退；谢绝，婉言拒绝 n. 减少，下降；衰退 情景导学 The number of giant tortoises has declined sharply due to human activities and climate change. 由于人类活动和气候变化，巨型陆龟的数量急剧下降。 用法归纳 ①decline in/of... ……的减少/下降 a decline in population 人口的减少 ②decline to do sth. 拒绝做某事 He declined to comment on the issue. 他拒绝就此事发表评论。 ③on the decline 在衰退中；在下降 ④fall into decline 开始衰退 词汇拓展 declining adj. 下降的；衰退的 a declining population 不断下降的人口 declination n. 倾斜；偏差；拒绝 即时训练 1. The population of this species has ________ (decline) by 30% in the past decade. 2. She ________ (decline) the invitation because she was busy. declined declined 考点串讲 句型精讲 It was not published until 1859 and immediately caused a storm. Sentence 1 not...until...句型，直到……才…… 引起轩然大波；引发激烈争论 and并列published和caused 译文：这本书直到1859年才出版，并立即引起了轩然大波。 即时训练 1. It was not until 1859 ________ the book was published. 2. The new theory ________ (cause) a storm in the scientific world. that caused 考点串讲 句型精讲 Darwin's scientific studies were so convincing that more and more people started to believe his theory. Sentence 2 so...that...句型 如此……以至于…… 从句谓语 译文：达尔文的科学研究如此有说服力，以至于越来越多的人开始相信他的理论。 即时训练 1. His theory was ________ convincing that many people believed it. 2. More and more people ________ (start) to protect the environment. so started Revealing nature 单元语法 外研版·选择性必修第一册 单元语法 过去完成时 · 过去完成时表示在过去某一时间或动作之前已经发生或完成的动作 即"过去的过去" 一、基本结构 肯定句：主语 + had + 过去分词 Darwin had collected many samples before he developed his theory. 否定句：主语 + had not (hadn't) + 过去分词 He had not seen such a species before. 一般疑问句：Had + 主语 + 过去分词？ Had you finished the experiment before the bell rang? 单元语法 过去完成时 二、基本用法 ①表示在过去某一时刻之前已经完成的动作， 常与by, before, by the time, by the end of等连用 By the end of last year, he had published three books. ②表示在过去某一动作之前已经完成的动作（即"过去的过去"）， 常用when, before, after, until等引导时间状语从句 When I arrived, the meeting had already begun. After he had finished his research, he published his findings. ③表示从过去某一时间开始，一直持续到过去另一时间的动作或状态， 常与for, since等连用 He had lived on the island for ten years before he returned home. 单元语法 过去完成时 三、过去完成时与一般过去时的区别 ①一般过去时表示在过去某个时间发生的动作或存在的状态 ②过去完成时表示在过去某个动作或时间之前已经发生的动作，即"过去的过去" 比较：He finished his homework.（过去完成作业） He had finished his homework before he went out.（出去之前已完成作业） 四、固定句型 ①Hardly had sb. done...when... 一……就…… ②No sooner had sb. done...than... 一……就…… ③It was the first/second time that sb. had done... 这是某人第一/二次做某事 即时训练 1. By the end of last year, he ________ (publish) three books. 2. When I arrived, the meeting ________ already ________ (begin). 3. It was the first time that she ________ (see) such a strange plant. had published had had seen begun 单元语法 语法专项练习 用括号内动词的适当形式填空 1. By the time he arrived, the train ________ (leave). 2. She ________ (finish) her homework before she went to bed. 3. I ________ (not see) him since he left school. 4. It was the second time that I ________ (visit) the museum. 5. Hardly ________ I ________ (arrive) when it began to rain. 答案 1. had left；2. had finished；3. hadn't seen；4. had visited；5. had; arrived Revealing nature 主题写作 外研版·选择性必修第一册 主题写作 主题解读 本单元写作任务：写一篇观察日记 【体裁】应用文——观察日记，融合记叙、描写与议论 【话题】围绕"揭示自然"主题，观察并记录植物生长过程或自然现象的变化 【时态】一般过去时为主，搭配一般现在时（描述客观规律） 【人称】第一人称为主 【格式】日记格式——日期、星期、天气写在开头 【写作要点】 ①开头：写明日期、星期、天气，交代观察对象和目的 ②主体：按时间顺序描述观察对象的变化过程，加入细节描写 ③突出最显著的变化或最有趣的发现，加入个人感受和思考 ④结尾：总结观察收获，写出从中学到的自然知识和感悟 ⑤恰当使用本单元词汇和过去完成时 主题写作 写作要点 ①审题：确定体裁为观察日记，时态以一般过去时为主，人称用第一人称 ②格式：掌握日记的标准格式——日期、星期、天气写在正文开头右上角 ③要点：必须涵盖观察对象、观察时间、变化过程、个人发现、感悟收获五个方面 ④语言：恰当使用过去完成时（如By the end of the week, the seed had...） ⑤连贯：使用时间状语连接全文，如at first, then, later, gradually, finally等 ⑥细节：加入视觉、触觉等感官描写，使变化过程生动具体 ⑦升华：结尾点明主题，写出从自然观察中获得的知识和人生启示 主题写作 写作思路 人物介绍 开头段 中间段 结尾段 开头（Introduction） 日期、星期、天气 交代观察对象（如一颗种子/一株植物） 说明观察目的 主体（Body） 初始状态：观察对象最初的样子 发展过程：按时间顺序描述变化（发芽、长叶、开花等） 关键发现：最显著的变化或最有趣的现象 细节描写：颜色、形状、大小、触感等 个人感受：观察过程中的心情和思考 结尾（Conclusion） 总结变化：观察对象最终的状态 收获感悟：从中学到的自然知识 升华主题：对生命、自然的思考和启示 主题写作 写作素材 开头常用句式 ①Today is sunny and warm. I decided to observe the growth of a bean seed. 今天阳光明媚，天气温暖。我决定观察一颗豆子种子的生长。 ②March 15, Sunday, Fine. Today I began my observation of a sunflower seed. 3月15日，星期日，晴。今天我开始观察一颗向日葵种子。 ③I have always been curious about how a tiny seed can grow into a tall plant. 我一直好奇一颗小小的种子如何能长成一棵高大的植物。 ④In order to learn more about plant growth, I planted a seed and decided to record its changes every day. 为了更多地了解植物生长，我种了一颗种子，决定每天记录它的变化。 ⑤It was a perfect day for observing nature. The air was fresh and the birds were singing. 这是观察自然的完美一天。空气清新，鸟儿歌唱。 ⑥Today I made an amazing discovery while observing my plant. 今天我在观察植物时有了一个惊人的发现。 主题写作 写作素材 中间常用句式 ①At first, the seed was just a small brown bean, hard and dry. 起初，种子只是一颗小小的棕色豆子，又硬又干。 ②On the third day, I noticed a tiny green shoot breaking through the soil. 第三天，我注意到一株嫩绿的小芽破土而出。 ③Gradually, the stem grew taller and the first pair of leaves unfolded. 渐渐地，茎长高了，第一对叶子展开了。 ④By the end of the first week, the seed had already grown into a small plant with three leaves. 到第一周结束时，种子已经长成了一株有三片叶子的小植物。 ⑤What surprised me most was how quickly the plant grew in sunlight. 最让我惊讶的是植物在阳光下生长得如此之快。 主题写作 写作素材 结尾常用句式 ①Through this observation, I learned that life is full of wonders and miracles. 通过这次观察，我了解到生命充满了奇迹。 ②Watching the seed grow day by day taught me the importance of patience and care. 看着种子一天天生长教会了我耐心和关爱的重要性。 ③This experience made me realize that nature is the best teacher. 这次经历让我意识到自然是最好的老师。 ④From then on, I became more interested in biology and decided to learn more about nature. 从那时起，我对生物学更感兴趣了，决定更多地了解自然。 ⑤I will never forget this meaningful experience of observing the growth of a seed. 我永远不会忘记这次观察种子生长的有意义的经历。 ⑥In a word, this observation not only brought me joy but also enriched my knowledge of nature. 总之，这次观察不仅给我带来了快乐，也丰富了我的自然知识。 ⑦Looking at the thriving plant, I felt a sense of achievement and pride. 看着这棵茁壮成长的植物，我感到一种成就感和自豪感。 主题写作 写作模板 【写作模板】 ________（日期）, ________（星期）, ________（天气） Today I decided to observe ________（观察对象）. I have always been curious about ________（观察原因）. At first, ________（初始状态）. On the ________ day, I noticed ________（第一个变化）. Gradually, ________（发展过程）. By the end of ________, it had already ________（过去完成时描述已完成的变化）. What surprised me most was ________（最显著的发现）. The ________（细节描写：颜色/形状/触感）. Through this observation, I learned that ________（学到的自然知识）. This experience made me realize ________（人生感悟）. I will never forget this meaningful experience. ①第一段：日期天气+观察对象+观察目的 ②第二段：按时间顺序描述变化过程，加入细节描写和个人感受（主体，详写） ③第三段：总结收获，升华主题 ④注意使用过去完成时和本单元词汇 主题写作 写作练习 【写作练习】 假如你是李华，最近你在生物课上学习了植物生长的知识。请你写一篇观察日记，记录你种植一颗豆子并观察其生长过程的经历。 内容包括： 1. 观察的时间、对象和目的 2. 豆子生长的变化过程（按时间顺序） 3. 你的发现和感受 注意： 1. 词数100左右 2. 可适当增加细节，以使行文连贯 3. 恰当使用本单元词汇（generate, characteristic, benefit等） 4. 恰当使用过去完成时 主题写作 写作范文 【写作范文】 March 15, Sunday, Fine Today I decided to observe the growth of a bean seed. I have always been curious about how a tiny seed can generate new life and grow into a strong plant. At first, the seed was just a small brown bean, hard and dry. I planted it in a pot with moist soil and watered it carefully. On the third day, I noticed a tiny green shoot breaking through the soil. It was so delicate that I was afraid to touch it. Gradually, the stem grew taller and the first pair of leaves unfolded. By the end of the first week, the seed had already grown into a small plant with three vibrant green leaves. What surprised me most was how quickly it grew in sunlight. The leaves felt smooth and looked full of energy. Through this observation, I learned that every living thing has its own characteristics and needs proper care to grow. This experience made me realize that nature is full of wonders and that patience is the key to discovering them. I will never forget this meaningful experience. Revealing nature 综合训练 外研版·选择性必修第一册 综合训练 一、根据句意及汉语提示写出单词。 1．这个世界将会不同，所以我们必须准备好适应变化。 The world will be different, and we will have to be prepared ________________. 2．到14岁的时候，他已经自学了高等数学。 By the end of he was 14 years old, he ________________advanced mathematics by himself. 3．看到生命的神奇真是太奇妙了。 It’s ________ to see the magic of life. 4．适应新环境的能力是成功物种的一个特征。 The ability to adapt to new environments is ________ successful species. 5．这次观察让我更加意识到生命的奇妙。 This observation has made me more ________ the wonders of life. 1．to adapt to the change 2．had learned/had learnt 3．amazing 4．a characteristic of 5．aware of 综合训练 二、单句语法填空 1．In the race to document the species on Earth before they go extinct, researchers and citizen scientists have collected __________ (billion) of records. 2．He had to pause from time to time to wipe the sweat from his forehead, because the air-conditioning system __________ (break) down. 3．It was the first time that she __________ (travel) alone. 4．The video shows us __________ seeds travel from place to place. 5．The birds on the islands had beaks of different shapes, _______ interested Darwin greatly. 6．Today, On the Origin of Species __________ (regard) as one of the most important works ever written. 1．billions; 2．broke; 3．had travelled 4．how; 5. which; 6．is regarded 外研版·选择性必修第一册 感谢聆听 $