unit 2 saving the earth
topic 3 would you like to be a greener person?
section c
the main activities are 1a and 2. 本课重点活动是1a和2。
Ⅰ. teaching aims and demands 教学目标
1. learn a new word:
technology, electric, wheel, steel
2. go on learning some compound sentences:
(1) in many countries, people produce power from coal, but it is very dirty and causes acid rain.
(2) although electric vehicles produce no pollution, there will be an increase in electricity needs if they are widely used.
3. learn the advantages and disadvantages of some kinds of energy.
Ⅱ. teaching aids 教具
挂图/图片/小黑板或幻灯片/录音机
Ⅲ. five-finger teaching plan 五指教学方案
step 1 review 第一步 复习(时间:10分钟)
通过对节能环保知识的复习讨论，导入新课，教学部分生词。
1. (通过对上一课1a的复习，强调怎样做才能成为绿色使者, 进一步增强学生的环保意识，同时也营造一种英语氛围，激发学生的学习兴趣。)
t: can you remember what we have learned in section b?
ss: yes.
(教师可以出示上一课1a的图片。)
t: what are jane and michael doing?
ss: they are talking about how to be a greener person.
t: can you tell me how to be a greener person?
ss: first, turn off the lights when we leave a room.
t: what about the next?
ss: walk or ride a bike instead of taking a bus or a taxi …
t: very good. please go on.
ss: take a cloth bag when we go shopping.
t: great. it’s easier said than done. so we have to keep on doing that every day.
2. (让学生分组讨论节约能源的各种方法，以旧带新，导入新课主题。)
t: we must not only protect our environment but also save energy like electricity. now discuss this problem in pairs: what should we do to save energy?
(采用竞答方式，鼓励学生说出日常生活中所观察到的节约能源的各种方法。)
t: well, i’m sure you have some new ideas to save energy. please tell me one by one. now let’s talk about how to be a greener person. who’s the volunteer? please hands up!
s1: don’t drive a car if you travel a short distance.
s2: write on both sides of the paper.
s3: don’t use the things that can be used only once.
s4: after we wash faces, we can use the water to wash clothes.
s5: take a cloth bag when we go shopping.
s6: turn off the tv set while we are away.
s7: …
t: well done! actions speak louder than words. if you want to be a greener person, you should do as what you say.
3. (通过学生对节能环保知识的讨论，教师引出文中所讲的新环保事物，出示1a的挂图，导入新课内容，教授生词。)
t: look at the pictures. maybe they are the new things that you haven’t known. they show us some forms of energy. some of them may do less harm to our environment. what’s it in picture a?
ss:it’s a car.
t: yes. what a beautiful car! but it looks strange, doesn’t it?
ss:yes.
t: it’s an electric car. it works well, but it’s slow and can’t run for long.
(板书并讲解，要求学生掌握。)
t: what’s it in picture b? who knows it?
s8:it’s a train. it can run fast.
t: you’re right. it’s a maglev train. its advantages are quiet, fast and clean, but it’s too expensive.
(板书并解释，要求学生理解maglev train。)
t: ok. let’s learn 1a and talk about other ways to produce power.
step 2 presentation 第二步 呈现(时间:10分钟)
呈现1a，完成1b。培养学生快速查阅字典的能力和快速阅读的能力。
1. (要求学生在字典中快速地查出1a中生词的意思，培养学生快速查阅字典的能力。)
t: take out your dictionaries. look up the new words in 1a as quickly as possible.
(以比赛的形式检查学生查字典的效果，看哪些同学最先完成。 板书并要求学生理解1a中生词power, acid, nuclear, per, guide; 了解biogas, straw, efficient; 掌握technology, wheel, steel。)
2. (让学生快速阅读1a中的2，为每段找到正确的图片。)
t: read the passage quickly, and choose the right picture for each paragraph.
3. (再次阅读，判断下列句子正误。用小黑板或幻灯片出示句子。)
t: read the passage again, and then mark true(t) or false(f).
(师生共同核对答案。)
4. (播放录音，让学生跟读，注意语音语调。)
t: now, listen to the tape of 1a and repeat. pay attention to the pronunciation and intonation.
step 3 consolidation 第三步 巩固(时间:10分钟)
巩固1a，完成1b，明确阅读任务，提高阅读能力。
1. (要求学生阅读1a课文，完成1b。明确阅读任务，有助于提高阅读效率。)
t: look at the form in 1b. read the passage again and fill out the table.
(几分钟后。)
t: discuss the answers in your group. then let’s check them together.
(先让学生在小组内讨论，然后师生共同核对答案。)
2. (让学生再读1a，找出疑难点，并鼓励他们分组讨论解决疑难点，教师作补充讲解。)
t: read 1a again, find the points you don’t understand, and then discuss in groups.
3. (根据1b表格，以问答形式复述1a课文，巩固1a。)
t: let’s retell 1a according to the table in 1b by asking and answering.
example:
(1) t: what are the advantages of biogas?
ss: renewable.
(2) t: can you say something about electric vehicle?
ss: efficient, cheap, and no pollution.
(3) t: what are the disadvantages of maglev train?
ss: much more expensive than traditional trains.
…
step 4 practice 第四步 练习(时间:8分钟)
学生四人一组讨论，进一步了解节约能源的几种新型发电技术，完成2。
1. (教师出示2中的图片，让学生看图说话。)
(1)t: now please look at the four pictures. what ways do they use to produce electricity? match the pictures with the proper sentences above.
(板书，并要求学生理解。)
(2)(核对答案后，让学生说出图中四种发电方式的优缺点。)
t: what’s the advantage of these ways?
ss: less pollution.
t: that’s right. for example, lighting is powerful. if it can be made good use of, that would be great. i’m sure you can do it one day. come on, my children.
…
t: what’s the disadvantage of these ways?
ss: all of them must be used to produce electricity in some special situations. that’s to say, they are limited. for example, people can produce electricity from the sun, but if there is no enough sunlight, how does it work? (学生在教师的帮助下回答。)
2. (让学生四人一组讨论更多的发电技术，然后向全班汇报。完成2。)
t: now, work in groups of four. think about what else can be used to produce electricity. then report to the class.
step 5 project 第五步 综合探究活动(时间:7分钟)
归纳本节课环保节能的方法，同时教育学生学会节约能源以及合理地利用能源。
1. (填写表格，让学生学会如何节约能源，更加合理地利用能源，以增强学生的环保意识。)
t: look at the form and think about things we should do every day and things we should not do to protect the environment, and what materials or waste things we can reuse, recycle and reduce. fill in the blanks in groups of four after discussion.
name
mon.
tue.
wed.
thur.
fri.
sat.
sun.
to do
not to do
to do
not to do
to do
not to do
to do
not to do
to do
not to do
to do
not to do
to do
not to do
s1
s2
s3
s4
t: discuss in groups and finish it as quickly as possible.
(几分钟后。)
t: who’d like to be a volunteer? report the answers of your group to the class.
s5: …
2. (和同桌一起讨论，列出环保的好习惯，教师鼓励学生列得越多越好。完成3。)
3. (要求学生在本课找出复合句，教师核对答案并板书。)
(让学生试着造句。)
t: could you make sentences with them? now, please have a try.
s6: i’d love to, but i have to finish my report first.
s7: he came up to her and she gave him a hug.
s8: could you take care of my dog while i’m away?
s9: …
4. homework:
turn to your parents and your friends and try to find some other kinds of materials that can produce electricity.
板书设计：