unit 13 we’re trying to save the earth（第1课时）教案

Unit 13 Were trying to save the earth 一、 教材分析 本单元带领学生了解了一些有关地球污染，动物濒危等问题。并且教给大家如何保护濒危动物，如何通过回收利用等方式来保护地球。本单元分为section A and section B 两个部分。本课为第一课时带领大家了解地球污染问题，以及探讨如何保护地球，减少污染。二、 三维目标 (一) 知识与技能 1. To learn the following words and expressions.bottom, coal, public, ugly, cost, advantage, method, cruel, harmful, afford.2. To understand the pasage on Page 99.(二) 过程和方法 3.To get a general knowledge of pollution by reading and role-play. 4. To know about how to reduce pollution through discussion. (三) 情感态度和价值观 5. After learning this part, every student will be aware of the serious situation of pullution and determined to take action to protect our earth fron now on.三、 教学重点 1. How to use the following words and expressions: cost, advantage, harmful, afford, used to, play a part in 2. to understand the passage on Page 99.四、 教学难点 1. How to use the following words and expressions: cost, advantage, harmful, afford, used to, play a part in 2. to understand the passage on Page 99.五、 教学策略 根据本课教学目标和重点内容，教师可采用听，读，小组讨论，角色扮演等活动来引导学生进行学习。六、 教学准备 ppt， recorder， mutiple-media七、 教学环节1、 课堂导入 Step 1 Lead-in1) Show some pictures about pollution and ask students to discuss whats the danger of each kind of pollution.2) Here are some words are related to different kinds of pollution. Write them in the box below, and you can add more words.loud music, littering, building houses, cars, ships, mobile phones, rubbish, factories, planes, smoking.Air pollution Noise pollutionWater 3) Role-play the following conversation and make your own conversations about the kinds of pollution above.A: The river was dirty. Even the bottom of the river is full of rubbish.B: But it used to be so clean.A: Yes, but people are littering in the river.B: Everyone in the town should play a part in cleaning it up.2、 课堂讲授Step 2. Reading 1) Fast-reading Now turn to page 99 and read the page quickly to find answers to the sheet.QuestionsAnswersWhere sharks fin soup is popularSouthern ChinaNumbers of sharks caught and traded every year70 millionHow much the numbers of some kinds of sharks have fallen in the last 20-30 years.over 90 percentTwo environment groups which are against finningWildAid and the WWF2) careful-reading Read the passage again and fill in blanks.so, although, if but, when Many people do not realize they are killing a whole shark _ they enjoy a bowl of sharks fin soup. Sharks are at the top of the food chain, _ if their numbers drop, the oceans ecosystem will be in danger. Many think that sharks are too strong to be endangered, _ they are wrong. _ there are no scienfitic studies to support this, a lot of people believe that sharks fins are good for health. Sharks may disappear one day _ we do not do something to stop the sale of sharks fins.Possible answers: when, so, but, although, if3) Studying useful words and expressions. cost v价钱为，花费 n.价钱，代价；花费，费用 The cost of a loaf of bread has increased five-fold. 一条面包的价钱增长了4倍。Badges are also available at a cost of 2.50. 徽章也有卖的，2.5英镑一枚。Its going to cost me over $100,000 to buy new trucks.买几辆新卡车将花掉我10万多美元。 harmful adj.对有害的；能造成损害的；不利；不良Smoking is harmful to our health.吸烟对人类的健康有害。 used to do过去一向，过去时常，过去曾（而现在不再）做Who used to do your laundry? 谁过去一直为你洗衣服？She used to wash dishes in a restaurant.她曾经在餐馆里洗过盘子。 afford vt.买得起；担负得起；提供；给予We couldnt afford to buy a new car. 我们买不起新的车。We cant afford to wait. 我们等不起。My parents cant even afford a new refrigerator.我父母甚至买不起一台新冰箱。 play a part in扮演某角色; 与有关，对有影响Id like to play a part in their discussion. 我愿意参与他们的讨论。Education is playing a big part in environmental protection.教育在环境保护中起着很大作用。He played a part in his favorite TV show.他在他最喜欢的电视节目中扮演了一个角色。3、 课堂练习Step 3 ExercisesTranslate the following phrases:1. 对有害2. 买得起.3. 在中起作用4. 过去常常5. 解决问题6. 起作用7. 听说8. 在顶部9. 在底部10. 切下，割下4、 课堂活动Step 4 Activities In your group make a list of things people can do to help the environment.5、 课堂小结Step 5. SummarizeLook back on what we have learned.1. How to protect environment.2. Useful languages : be harmful to, at the top of, at the bottom of. Solve problems6、 作业布置Homework : make a conversation with your parnter about what you can do to reduce pollution.八、 板书设计 Unit 13 Were trying