Unit 4 课本知识预习+巩固练习（导学案）新三年级英语暑假自学课（沪教版五四制·新教材）

沪教版五四制三年级上册 暑假自学课 Unit 4 Water in our life 单元知识整合 一、必会词汇 water n. 水 cloud n. 云；云朵 river n. 河；江 lake n. 湖；湖泊 sea n. 海；海洋 water vapour 水蒸气 rain n. 雨；雨水 snow n. 雪 ice n. 冰 from prep. 来自 become v. 变成 where adv. 在哪里 cold adj. 寒冷的 hot adj. 热的 when adv. 什么时候 二、重点短语 little by little 缓慢地；一点一点地 become clouds 变成云 make plants grow 使植物生长 keep food nice 保持食物新鲜 find me 发现我 in the air 在空气中 三、核心句型 1. Where is ice from? It's from water vapour and water. 冰来自哪里？——它来自水蒸气和水。 2. Where is water vapour from? It's from water. 水蒸气来自哪里？——它来自水。 3. Where is rain from? It's from the water vapour in clouds. 雨来自哪里？——它来自云中的水蒸气。 4. When it is hot, water becomes water vapour. 当天气热时，水变成水蒸气。 四、重难点突破 Where is ... from? 句型 Where is ... from? 用来询问某物来自哪里，回答用 It's from... 结构。from 是介词，表示「来自；从……起」。这个句型常用于描述事物的来源。 Where is ice from? It's from water.（冰来自哪里？它来自水。） Where is rain from? It's from the clouds.（雨来自哪里？它来自云。） Where is water vapour from? It's from water.（水蒸气来自哪里？它来自水。） 【进阶训练】选择正确的选项：Where is snow _____? A. in B. on C. from D. at 答案：C Where is ... from? 是固定句型，from 表示「来自」，所以选 C。 水的三态变化 水有三种形态：liquid（液态的 water）、gas（气态的 water vapour）、solid（固态的 ice）。当温度变化时，水的形态也会改变：hot → water 变成 water vapour；cold → water vapour 变成 water；very cold → water 变成 ice。become 表示「变成」，后面接名词或形容词。 When it is hot, water becomes water vapour.（当天气热时，水变成水蒸气。） When it is cold, water vapour becomes water.（当天气冷时，水蒸气变成水。） When it is very cold, water becomes ice.（当天气很冷时，水变成冰。） 【进阶训练】选择正确的选项：When it is very cold, water _____ ice. A. become B. becomes C. becoming D. to become 答案：B water 是第三人称单数，动词用第三人称单数形式 becomes。 when 引导的时间状语 when 表示「当……时候」，引导时间状语从句。when 从句可以放在句首，也可以放在句末。放在句首时，从句后要加逗号。when 从句说明在什么条件下发生某事。 When it is hot, water becomes water vapour.（当天气热时，水变成水蒸气。） Water becomes ice when it is very cold.（当天气很冷时，水变成冰。） 【进阶训练】选择正确的翻译：「当天气冷时，水蒸气变成水。」 A. When it is hot, water vapour becomes water. B. When it is cold, water vapour becomes water. C. When it is cold, water becomes ice. D. When it is very cold, water becomes ice. 答案：B 天气冷对应 cold，水蒸气变成水对应 water vapour becomes water，所以选 B。 知识演练场 一、看图选词，将序号写在括号内 1. ( ) A. river B. lake C. sea D. rain 2. ( ) A. river B. sea C. lake D. cloud 3. ( ) A. rain B. snow C. ice D. cloud 4. ( ) A. cloud B. rain C. snow D. water 二、选出不同类的一项 1. A. river B. lake C. cold D. sea 2. A. rain B. cloud C. snow D. hot 3. A. water B. become C. ice D. snow 4. A. from B. where C. when D. hot 三、单项选择 1. Where is ice _____? A. in B. on C. from D. at 2. When it is hot, water _____ water vapour. A. become B. becomes C. becoming D. to become 3. It's _____ water vapour in clouds. A. in B. on C. at D. from 4. Water becomes _____ when it is very cold. A. rain B. snow C. ice D. cloud 5. Where is rain from? It's from the _____. A. river B. sea C. lake D. clouds 四、选词填空，将序号填入横线上 A. from B. become C. cold D. hot E. when 1. Where is water _____? 2. When it is _____, water becomes water vapour. 3. When it is _____, water becomes ice. 4. Water can _____ ice, water vapour and rain. 5. _____ it is cold, water vapour becomes water. 参考答案 【重难点突破】 1. C 2. B 3. B 【知识演练场】 一、1. A 2. C 3. D 4. C 二、1. C 2. D 3. B 4. D 三、1. C 2. B 3. D 4. C 5. D 四、1. A 2. D 3. C 4. B 5. E 第 1 页 共 4 页 学科网（北京）股份有限公司 $