Unit 5 Amazing Nature 复习讲义 一、单元主题与词汇精讲 主题解读：本单元围绕“神奇的自然”展开，探讨自然现象、动植物多样性及环境保护，涉及地理、生态和气候等话题。 核心词汇分类 自然现象类动植物类环保类 mountain (n.) 山脉 forest (n.) 森林 protect (v.) 保护 river (n.) 河流 bird (n.) 鸟 pollution (n.) 污染 volcano (n.) 火山 insect (n.) 昆虫 recycle (v.) 回收 例题1： Q: The _____ in this area is very serious. We should take action. A. mountain B. pollution C. forest 解析：选B。根据句意“该地区污染严重”，选pollution。 高频短语 protect the environment 保护环境 in danger 处于危险中 cut down trees 砍伐树木 save energy 节约能源 take care of 照顾 例题2： Q: Many animals are _____ because of losing their homes. A. in danger B. in time C. in fact 解析：选A。in danger表示“处于危险中”，符合语境。 二、语法专项突破 1. 形容词比较级与最高级 规则： 单音节词：tall → taller → tallest 多音节词：beautiful → more beautiful → most beautiful 不规则变化：good → better → best; bad → worse → worst 例句： The Amazon is longer than the Nile. (比较级) Mount Qomolangma is the highest mountain in the world. (最高级) 例题3： Q: This is _____ (interesting) book I have ever read. A. interesting B. more interesting C. the most interesting 解析：选C。最高级结构“the most interesting”。 2. 情态动词must的用法 用法：表示义务或强烈建议，意为“必须”。 结构：主语 + must/mustn’t + 动词原形 例句： We must protect wild animals. You mustn’t throw rubbish here. 例题4： Q: Students _____ wear uniforms at school. A. must B. can C. may 解析：选A。校规要求“必须”穿校服。 3. There be句型 规则：表示“存在”，遵循就近原则。 结构： There is + 单数名词/不可数名词 There are + 复数名词 例句： There is a river near the village. There are many birds in the forest. 例题5： Q: _____ some milk in the bottle. A. There is B. There are C. Have 解析：选A。milk为不可数名词，用There is。 三、句型与话题表达 1. 描述自然现象 There are many volcanoes in this country. The river is getting dirtier because of pollution. 2. 环保倡议 We must stop cutting down trees. It’s important to recycle paper and plastic. 例题6： Q: —_____ we do to protect the Earth —We can plant more trees. A. What can B. How can C. Where can 解析：选A。What can we do询问“我们能做什么”。 四、题型解题技巧与例题 1. 完形填空：语境推断法 技巧： 根据自然主题词汇（如pollution, forest）选择合适选项。 注意形容词比较级与最高级的上下文提示。 例题7： Q: The air in the city is _____ (bad) than before. A. bad B. worse C. worst 解析：选B。than提示用比较级，bad的比较级为worse。 2. 阅读理解：事实细节题 技巧： 定位关键词（如地名、数字）。 对比选项与原文细节是否一致。 例题8（根据短文）： Q: How many kinds of birds are there in the forest A. 50 B. 100 C. 150 解析：定位原文“There are over 100 species of birds.” 选B。 3. 书面表达：环保倡议书 题目：How to Protect Our Planet 模板： 开头：Our planet is facing many problems. Here are some suggestions. 主体：First, we should... Second,... Finally,... 结尾：Let’s work together to make the Earth cleaner! 范文 ... ...
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