Chapter Two Pollution FightersI.章节分析（一）综述本单元的Reading部分的文章是关于“树和环境”。
通过一名中学生采访科学家来了解“树”对环境保护所起的作用。
“污染”问题是一个旧话题，在6B Module 1The Natural Elements和教材后面的Project 1 The Environment 都谈论到环境与污染的问题；7A Module 3 Natural Elements Unit 4 Forests and land中谈到了森林，实际上就是谈树的作用和用途。
其中的大部分内容都是我们的学生很熟悉的，所以老师在引入新课时，可以从学生们熟悉的话题“森林”谈起，很自然的进入新课内容。
本单元的Listening部分也是围绕主题，通过Completing a notice的形式，进一步让学生了解树的作用，从而积极投入到“植树战役”中去。
Language部分介绍了现在进行时(the present continuous tense)的用法。
Speaking部分围绕本课的主题讨论How to fight pollution我们可以把这部分内容放在Post-reading环节，让学生进行讨论。
Using English 部分(The index) 老师可以告诉学生the index 与the contents page 都可以帮助我们快速了解一本书的信息，只是the index 的排版大部分在书后，而且是以字母循序排列的，有主题，比较详细而the contents page 的排版在书的前面，按页码排序。
Writing部分是为学校报纸写一篇有关工人们是如何建造一个sitting-out area的文章。
（二）教学目标1. 知识目标1）词汇：掌握本章出现的生词。
2）语法：能熟练运用现在进行时的陈述句，一般疑问句，特殊疑问句。
3）功能：能和同学，老师表达自己的思想。
4）话题：能谈论“抗污染”这一话题。
2. 能力目标1）听：通过听录音材料来培养学生捕捉特定信息的能力。
并强化自己在阅读中所获取的信息。
2）说：通过看图说话，谈论话题，与同学交流，合作中反复运用语言，自己的所学来表达自己的思想，观点。
3）读：通过朗读对话，快速阅读来培养学生快速捕捉信息，解决问题的能力。
4）写：根据所给话题，把自己的想法，观点与同伴的交流成果写在纸上。
3. 情感目标通过谈论话题，小组合作的形式激发学生学习英语的兴趣以及合作意识。
强化学生自主学习的目的。
指导协同努力实现自己的教学目标。
（三）教学方法课文的引入和现在进行时态的训练时可使用游戏教学法。
在课文教学中可采用任务型教学法，引导学生完成教学设计。
合作学习法完成说和写等部分的练习（四）重点和难点1．现在进行时：I’m reading.He is not working.Are they planting treesWhat’s Ted doingHe’s pla ying volleyball with CarolIs Ted playing volleyballYes, he is. / No, he isn’t. He’s _____.2．快速阅读抓住自己需要的信息。
通过听力的形式对所获取的信息进行巩固加深。
3．小组合作讨论如何防治污染并以对话的方式体现，并能自己阐明观点。
4．记录自己本节所学。
II. 教学设计：1. ReadingStep 1 Pre-reading1)老师可以通过复习旧句型：What can we get from forests 引出本单元的主题。
然后让学生根据图片一问一答做 pair work，来了解 What good are trees 当然除了老师提供的图片以外，也可以让学生根据自己了解到的知识自由发挥。
2)老师与学生一起得出结论：Trees are very useful and important. 老师接着问学生：What else do you know about trees How long do trees live 然后让学生来做一个与树有关的quiz。
通过这个quiz让学生知道 Trees are pollution fighters.老师还可以充分利用教参中的Notes来帮助学生进一步了解树是如何与空气污染、水污染和噪音污染作斗争的。
同时帮助学生解决部分Reading中的生词，如：chemical, produce, release, oxygen, nasty等等。
Step 2 While-reading（这是本课的重点部分）1)第一遍阅读文章，要求学生根据上下文的内容和线索猜测词意。
2)第二遍通读全文，理解文章意思，并完成Ex. D (page 18)、Ex. E (page 19)。
提醒学生阅读时注意阅读方法的使用。
比如，在做Ex. D时，使用scanning即跳读的方法寻找具体问题的答案。
在做Ex. E时，使用skimming即略读的方法，注意文章中的主题句和关键句。
3)听课文录音。
4)重点词汇及句式讲解。
1. collect some facts for a class project on pollution2. pollute (v.) / pollution (n.) / polluted (adj.) / pollutant (n.) 污染物3. interview (vt.) Doctor Ray4. be interested in = be keen on / be fond of / enjoy / like 喜欢，感兴趣5. show (great) interest in6. interest (n./v.) / interesting (adj.) / interested (adj.)7. the biggest and oldest living things on earth8. live (v.) 生活，居住 . Where do you live(adj.) 活着，有生命 . Have you ever touched a real live snake现场直播的. It wasn’t a recorded show, it was live.lively (adj.) 有生气的，活泼的，充满活力的 . They are lively children.alive (adj.) 活的. The young woman was still alive when the ambulance reached the hospital.He kept the little cat alive by feeding it warm milk.充满生机的 . In the evening the town really comes alive. (名词后用alive) living (adj.) 活的 . Does he have any living relatives (名词前用living) (n.) 生活 . She makes a living by selling newspapers.life (n.) (个人的)生命 C . Three lives were lost in the fire.Doctors fought all night to save her life.生活 U . Life can be hard for a single parent.That’s life, you can’t change it.Exercises: 1) My family __________ in New York ten years ago.2) Is your grandfather ___________3) What is the oldest ____________ things in the world4) Policemen make our __________ safe.5) The _________ people should always look forward.6) My pet dogs are dying. Can’t you make them __________7) I make a ____________ by teaching in a middle school.9. What good are trees = What is the good of trees 树有什么好处呢10. make streets more beautiful and less noisy11. noise (n.) / noisy (adj.) / noisily (adv.)12. else (adj.) 其它的 (置于疑问代词或不定代词后). What else can they do Do you want to buy anything elseother (adj.) 其它的 (置于名词前) . We study Chinese, math, English and other subjects.13. suppose (v.) = think something to be true. I suppose you felt tired after running the marathon (, didn’t you). suppose = pretend that something is true. Suppose you had a million dollars, what would you do14. enjoy breathing pure, cool air (enjoy doing sth)15. breath (n.) [breθ]/ breathe (v.) [bri: ]Exercises: 1) People ________ slowly when they are sleeping.2) You can see people’s ___________ on a cold day.3) I need a _________ of a fresh air.4) The doctor told me to __________ in and __________ out again slowly.16. Thank sb for sth. . Thank you for your help. / Thank you for helping me.17. natural air conditioners 自然空调 (nature / natural)18. take harmful gas from the air19. release oxygen into the air20. one and a half hectares of tree 一公顷半的树木21. produce enough oxygen to keep your whole class alive and healthy for a year产生足够的氧气供你们全班学生一年时间的存活和健康成长22. Trees cool the air as well as clean it.as well as… = besides / in addition to. On Sundays, his farm provided lunch as well as breakfast.It is important for y ou as well as for me.Father as well as his children hasn’t been to Euro Disney. (远离原则) William Shakespeare was an actor as well as a play writer. (强调前者) = William Shakespeare was not only a play writer but (also) an actor. (强调后者)23. Three trees can do the jobs of 15 air conditioners running (=as they are running ) almost all day.24. know a lot about trees25. attack a tree 攻击树 attract one’s attention引起某人注意26. warn its neighbors27. warn sb of sth./sb warn sb against doing sth. The policeman warned us against running across the road.警察警告我们不要跑着过马路。