9B Unit 1 Saving the earth
章节综述
章节分析（Reading section ） （一）综述
本单元是关于一本有关地球环境的处于危险的书。现在对地球环境存在很多威胁。，本文通过五个方面来描述地球所面对的危机，学生通过阅读和分析，培养学生良好的环境保护意识，让他们感觉到制止污染已经成为一个刻不容缓的问题。
本课的任务有两个：
1 对课文进行整体阅读。培养学生略读（获取大意）、扫读（整理有关信息）、
细读（分析篇章结构，概括中心）等的阅读技能。 2 结合课文内容，引导学生谈谈和写作如何做到保护环境，提高保护环境意识。 （二）单元目标 1． 知识与能力：
学习课文中重点单词、词组、句型和语法；了解课文大意。 学会使用 as..as 来比较物品和事情 动词ing的多种使用形式
提高学生的阅读理解能力和培养学生的阅读技巧。通过阅读准备（收集与树木作用、污染有关的资料）、略读（获取大意）、扫读（整理相关信息）等方式，培养学生理解能力，信息处理能力，思维能力，继续培养学生阅读能力。 2． 过程与方法
采用任务型教学法组织教学，通过比较、归纳、讨论等具体活动，达到教学效果。 3．情感态度与价值观
让学生认识到保护环境的重要性，并决定为环保出一份力，做绿色环保者。 （三）重点和难点
壮语从句so?that 和so that
First Period
Teaching aids: 1. Students‘ Book 2. cassette player
New words and expressions:
1. green consumer 绿色消费者 2. in danger 处于危险中 3. global warming 全球变暖
4. vital 致命的，重要的 5. save the earth 拯救地球 6. first of all 首先
7. threat 危险，危害，威胁 8. environment 环境 9. the Greenhouse Effect 温室效应 10.imagine 想象，设想 11.atmosphere 大气 12.fuel 燃料
13.keep?from 阻止?做某事 14.warmth 温暖，暖和 15.lifeless 无生命的
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16.pollute 污染 17.chemical 化学药品
18.in the form of gases 以气态的形式存在 19.keep in 抑制，保留 20.carbon dioxide 二氧化碳 21.environmentally friendly 环保的 22.petrol 汽油
23.level 水平，水准 24.drown 淹死 Teaching procedure:
ⅠPre-task preparation
1. Warming up and introduction of the topic:
Tell students something about the cartoon. The joke is a pun on the two meanings of the word ‘green’. ‘Hi’ has told ‘Lo’ to become green, meaning that he should care for the environment. But ‘Lo’ has misunderstood the advice from his friend, and has painted himself the colour green.
The word ‘green’ has become associated with things which are friendly to the environment. It is now regularly used about products, action groups and policies 2. Ask the students the following questions:
a) T: What is happening to the ozone layer?
S: Huge holes have appeared over the North and South Poles. b) T: What will the bad effects of cutting down trees be?
S: There will be more carbon dioxide in the atmosphere. S: There will be fewer animals and plants. S: Many areas will become deserts. S: The earth will become warmer.
c) T: What should we do with our rubbish?
S: Sort it out and recycle glass, plastic, paper and metal.
d) T: If you look after the environment, what colour do we say you are?
S: Green.
3. Look and think:
a) This exercise shows the students how to approach a new text, learning as
much as possible about it before a detailed study.
b) Let the students work in pairs to complete the exercise, and then ask some
pairs to report their answers to the class.
4. Read the new words. Ⅱ While-task procedure
1． Listen to the tape recording of the first passage
2． Listen and repeat it sentence by sentence after the recording. 3． Explain some new words and expressions on the reading. 1) green consumer: 绿色消费者
consumer: (解释)a person who buys or uses something, customer （词性转换）v: consume
（例句）The consumers complained about the poor quality of the
electronic products.
2) situation 情况，状况
（例句）I’m afraid the situation is very serious. 3) in danger: 处于危险中 danger: 危险
（词性转换）adj: dangerous 4) vital: 致命的，重要的
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(解释) essential, very important
（词性转换）adv: vitally
（例句）1. It’s vital that we do something to save the earth. 2. Oxygen is vital for life. 5) save the earth: 拯救地球 save: 拯救，搭救
（词性转换）adj: safe n: safety adv: safely 6) first of all: 首先
（例句）First of all, let’s invite Mr Wilson to give us a speech. 7) threat: 危险，危害，威胁
(解释)danger
（词性转换）v: threaten威胁, 恐吓
（例句）1. The threat of war has depressed business activity. 2. He took no notice of his father’s threat. 3. What are the threats to the environment?
4. Corruption and crime are serious threats to any society. 8) environment: 环境
(解释)the natural world around us, surrounding
(例句）If we destroy our environment, we will destroy ourselves. 9) the Greenhouse Effect 温室效应 10)imagine: 想象，设想
(解释)make a picture of something in your mind
(词性转换）n: imagination
（例句）1. He imagines that people don’t believe him. 2. I can’t imagine what he looks like. 11)atmosphere: 大气
(解释)the mixture of gases which are around the earth
（例句）1.The rocket went up through the atmosphere and into space. 2. The atmosphere covers the whole earth. 12)act: 生效，发生作用
(解释)do sth. or behave in a certain way
（词性转换）n:action, actor, actress adj: active （例句）Does the drug take long to act? 13)keep?from: 阻止?做某事
（例句）She tried to keep me from seeing the letter. 14)warmth: 温暖，暖和
(解释)heat
（词性转换）adj: warm
（例句）She felt the warmth of the sun on her face. 15)lifeless: 无生命的
(解释)without any form of life, dead
(例句）We think that Mars is a lifeless planet.
16)pollute: 污染
(解释)make something dirty, unpleasant or dangerous
（词性转换）n: pollution
You can see the pollution on this beach. （例句）1. Your smoking is polluting the air in this room.
2. The stadium lights polluted the sky around the observatory. 17)chemical: 化学药品
（词性转换）n: chemistry 化学
18)in the form of gases: 以气态的形式存在
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19)keep in: 抑制，保留
20)carbon dioxide: 二氧化碳 21)fuel: 燃料 22)petrol: 汽油
23)level: 水平，水准
(例句）1. The garden is arranged on two levels.
2. I finally found my own level in the business world. 24)drown: 淹死
(解释)kill by covering with water
（词性转换）n: drowner
(例句）1. Some plants will drown if you water them too much. 2. Don’t play by the river in case you fall in and drown.
4. Read the reading together. 5. T or F
1) It’s not vital that we do something to save the earth. F 2) The atmosphere is essential to us. T
3) We are polluting our earth with chemicals, so our atmosphere is changing. T 4) The Greenhouse Effect is harmful to the earth. T 6. Ask and answer:
1) What’s around our earth? What is it like?
2) What would happen if there is no atmosphere around the earth? 3) Why is the atmosphere changing ?
4) What should we do to deal with the problem? Ⅲ Post-task activity
1）ask students to say something about the importance of the atmosphere 基本要求 2）say in your own words what the job of the atmosphere is 提高要求
3）.Ask some students to describe what greenhouse effect is in their own words. And draw a diagram to help you retell the text if you can .提高要求 Consolidation:
1. Read the reading after the tape recording 基本要求. 2. Recite the new words and expressions 基本要求
3. write an article about what causes the greenhouse effect and what happened to the earth
because of the greenhouse effect 拓展要求 Sum up:
本课时先扫除学生的单词关，为学生接下来学习reading的内容打好基础。
Second Period
Teaching aims:
To review the first passage of the reading
1. To learn the second part of reading and let students master some words and expressions
2. To tell the students about the environment, threats to the environment from pollution and how
we can protect the environment. Teaching aids: 1. Students‘ Book 2. Cassette player
New words and expressions:
1. damage 损害，伤害 2. the ozone layer 臭氧层
3. occur 发生，出现，存在 4. protective 保护的，防护的 5. burn up 烧起来，烧掉
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