资源描述
Unit 2 Saving the EarthTopic 3 What can we do at home to protect the environment?Section A【学习目标】1.学习由连词or and, but和while连接的复合句；2.从“减量”，“再使用”，和”再循环”的角度讨论保护环境。【预习案】一、在文中找到并划出下面的短语41.环境保护_ 2.为一个组织工作_3.保护环境为一个组织工作_ 4.我的专职工作_5.传播信息_ 6.循环使用塑料袋_7.省钱_ 8.收集废纸_9.饮料罐_ 10.一种污染_ 11.考试不及格_ 12.错过公车_13.失败几次_ 14.放弃_【探究案】 在文中划出下面的句子并分析1.We all know that youre working for an organization that protects the environment.译：_思考：句中的第一个that引导 _从句, 第二个that引导_从句点拨：work for 为工作 链接：play for - _拓展：work as - 充当，担当 work on-从事 work out -算出 work hard at -在方面工作努力巩固：a. We should work for our motherland to make her stronger and more beautiful . 译：_ b. You can work as a teacher like Linda after college. 译：_ c. He is working on a special job to protect the environment. 译：_ d.Can you work out how much money it will need? 译：_ e.Work hard at English and you will make great progress soon. 译：_2.My main job is to help spread the message about protecting the environment.译：_总结：help sb. (to) do sth.-帮助某人做某事help sb. with sth.-帮助某人某事cant help doing sth.-禁不住做某事练习：1.我昨天帮助我妈妈做家务活了。I _ my mother _ _ _ yesterday. 2.你能帮帮我的英语吗？ Can you _ me _ my English? 3.听到那个消息后，她禁不住哭了。_ _ the news, she _ _ _.3.So we encourage students to collect waste paper and soft drink cans.译：_点拨: encourage sb. to do sth. 鼓励某人去做某事练习：My mother _ me to _ the sports meeting. 我妈妈鼓励我去参加运动会。Section B【学习目标】1.学习用ought to提建议；2.从身边小事做起，师生一起保护环境，做一个环保人。【预习案】一、 在文中找到并划出下面的短语1.做一个环保人士_3.关灯_5.骑车_7.乘公交车或打的_9.节约能源_11.带个布袋_13.说起来容易做起来难_2.应该_4.最好走路骑车_6.代替_8. 短距离旅行_10.减少空气污染_12.不要使用塑料袋_14.行动胜于语言_二、在文中划出下面的句子并分析1.You ought to shut off the electricity when you leave a room.译：_点拨：ought to-应该，应当(情态动词，无人称，时态及数的变化) 表示责任, 义务或道义上应该语义同should注意：ought to的否定形式为ought not to do sth., 缩略形式oughtnt to疑问形式为ought + 主语 + to do sth.? 肯定回答：Yes, 主 + ought. 否定回答：No, 主 + ought not. ought to 的反义疑问句中，附加疑问部分用ought或should疑问练习：a. We ought to be polite to the old. 译：_b.你应该帮你妈妈做些家务活。You _ _ _ your mother _ some housework.c.你不应该在墙上画画。You _ _ draw on the wall.d.我应该立刻去浇花吗？_ I _ _ the flowers at once? e.我们应该现在出发，是吗？We _ _ _ now, _ _?2.Youd better walk or ride a bike instead of taking a bus or a taxi if you travel a short distance. 译：_点拨：d better = had better 总结：had better (not) do sth. 最好(不)做某事 点拨：instead of代替，而不是 (介词短语) 练习：a.你们最好明天准时到这儿。You _ _ _ here _ _tomorrow. b.老人最好不要开车。_ _ _ _ _ drive cars. c.我将代替他参加运动会。I will _ _ _ the sports meet _ _ _. d.昨天晚上我去看电影了没有呆在家。I _ _ _ _ instead of _ at home_ _. 6Section C【学习目标】1.继续学习连词引导的复合句；2.了解现代科学技术在环保方面的作用。【预习案】一、在文中找到并划出下面的短语1.用煤矿生产能源_ 2.造成酸雨_3.使用核能生_ 4.全世界的人_5.寻找新办法_ 6.首批国家之一_7.使用沼气技术_ 8.制沼气_9.可再生能源_ 10.在人们的日常生活中_11.主要缺点_ 12.上海世博会_13.最著名的磁悬浮火车_ 14.达到最高时速_15.更贵得多_ 16.传统铁轨_17.用尽_ 18.发电_【探究案】 在文中划出下面的句子并分析1.Some countries use nuclear energy to produce power. 译：_点拨：use sth. to do sth.=use sth. for doing sth. -使用某物做某事 练习：a.在过去人们使用竹子写字.People _ bamboo _ _ in the past. b.人们用风发电。People _ wind _ producing electricity.2. The train can reach a top speed of 431 km per hour. 译：_点拨：reach a speed of+具体速度 -达到某个速度链接：at a speed of + 具体速度-以某个速度, 可用high, low, full等形容词修饰speed 。练习：a.北京至天津线火车时速达到每小时300千米。Beijing-Tianjin train travels _ _ _ _ 300 km per hour. b.我们以每小时30英里的速度前进。We were traveling _ _ _ _thirty miles per hour.3 It takes people just 7minutes to go to the airport 30km away. 译：_同义句：_4.However, maglev guide paths are much more expensive than traditional steel railways.译：_点拨：形容词前可加a lot, much, far, a little ,even等词修饰；还可在形容词比较级前加表数量的词。练习：a. Dont go by plane. Its a lot more expensive. 译：_ b. His illness is far more serious than we thought. 译：_ c. Its a little colder today than it was yesterday. 译：_ d. It was cold yesterday, but its even colder today. 译：_ e. My sister is two years younger than me. 译：_ 10Section D【学习目标】1.总结复合句的用法；2.继续学习和拓展环境保护的话题。【预习案】 在文中找到并划出下面的短语1.地球的肺_3.制造氧气_5.面临许多困难_7.寒冷潮湿_9.不同种类的_2.清除二氧化碳_4.例如_6.炎热干燥_8.植树者_10.植树_【探究案】 文中划出下面的句子并分析1. In many countries, such as New Zealand, Canada, and Brazil, forests were cut down to provide wood to build houses.译：_.点拨：such as “例如”，列举几个例子 for example “例如”，列举一个例子，前面有逗号隔开。练习：I have traveled many cities _ _ Beijing, Shanghai and Shenzhen. I like western counties, _ _ , America. 2. They plant different types of trees so that birds and animals can live in the forests.点拨：different types of + 可数名词的复数 “不同种类的”我喜欢不同种类的电影。_.so that引导目的状语从句，意为“以便，为了，使能够”They got up early_ they could catch the early bus. 他们早早起床以便坐上早班车。so that引导的是表示结果的状语从句，但不一定是“如此以至于”This book is_ interesting _everyone wants to read it.这本书如此有趣以致于每个人都想要阅读。
展开阅读全文