高中定语从句课件

　　Teaching aims:

　　知识目标：To master some words and expressions about save our world:

　　factory, pollute, recycle, waste, enemy, crop, kill, oil, less, such as, hopeless…

　　能力目标：

　　1.To understand passages about pollution .

　　2. to learn to say why we need to save the world and how to be green.

　　New words

　　pollute v. 污染

　　factory n. 制造厂; 工厂

　　waste n. 废料; 废弃物

　　recycle v. 回收利用, 再使用(废品)

　　crop n. 庄稼; 作物

　　enemy n. 敌人; 仇人

　　oil n. 石油

　　kill v. 杀死; 弄死

　　What causes pollution ?

　　1.Pollution from factories spreads over cities and villages.If the rivers are polluted, farmers can’t use them to water their crops .

　　2.In some places, pollution from factories spreads over cities and villages

　　3.The cars on the roads use so much oil and cause pollution .

　　What can students do ?

　　1.every class collects waste which can be recycled or used again .Then the school sells the waste to help students.

　　2. Order food that you can finish.

　　3. Use less electricity at home.

　　4. Learn ways to recycle rubbish.

　　5. Divide rubbish into different groups.

　　6. Use paper cups and paper bags.

　　7.Go to school on foot or by bike.

　　8. Do not throw away things made of glass, plastic and paper, but recycle them when possible.

　　9. Turn off lights when you do not need them.

　　10. Take a bag when you go shopping in stead of asking for a plastic bag.

　　11. Use things for as long as possible.

　　language points

　　1. We throw tons of rubbish away each year, and we have to make a change.

　　ton n. 吨

　　tons of 许多, 很多

　　e.g 我们为今晚的聚会买了大量饮料。

　　We’ve bought tons of drinks for the party tonight.

　　throw away 扔掉; 丢弃

　　e.g. When are you going to throw away those old magazines?

　　你打算什么时候扔掉那些旧杂志.

　　他已经失去了一个良好的机会。

　　He has thrown away a good chance

　　2. Repeat these three words daily: reduce, reuse and recycle.

　　repeat v. 重说; 重新做

　　前缀“re-”, 意思是“再, 重复”

　　e.g. I repeated after the teacher word by word.

　　我跟着老师一个字一个字地读。

　　3. Although it takes energy to change things into something else, it is better than throwing things away or burning them.

　　change … into …

　　把……变成……

　　e.g. You can’t change iron into gold.

　　你无法把铁变成金子。

　　4. We cannot hope for rapid change, but let’s take these simple steps today …

　　take steps 采取措施

　　e.g.我们需要采取一些措施了减少污染。

　　We need to take some steps to reduce pollution

　　构词法

　　1.合成法

　　将两个或两个以上独立且语义不同的单词合在一起构成新词的方法叫做合成法。合成法是一种比较灵活的构词方法，可以合成名词、形容词、副词、代词、动词等。例如：afternoon, sportsman, blackboard, sportsperson, newspaper,

　　2. 派生法

　　通过在词根前面加前缀或在词根后面加后缀构成一个新词的方法叫作派生法。要通过派生法理解和记忆单词, 我们需要掌握常见的前缀和后缀及派生规律。

　　3. 转化法

　　英语构词法中把一种词性转化为另一种词性而词形不变的方法称作转化法。常见的转化有：

　　(1) 动词转化为名词

　　— Let’s talk about it more.

　　咱们再谈谈这件事吧。

　　— I think we’d better finish the talk now.

　　我想我们最好现在结束谈话。

　　(2) 名词转化为动词

　　She gave me a cup of water.

　　她给了我一杯水。

　　You should water the flowers twice a day.

　　你应该每天给这些花浇两次水。

　　Exercises

　　Complete the sentences with the words in the box.

　　hopeful impossible reuse unhealthy wasteful

　　1. Polluted water is _________.

　　2. It is _______ to throw so much food away.

　　3. If you look after things well, you may _______ some of them later.

　　4. It is ________ to clean up the whole river in such a short time.

　　5. If we pay attention to pollution now, the future will be ________.

　　Complete the sentences with the correct form of the words in Activity 3.

　　She was hopeful that her new job would make her more successful.

　　1. The factory _______ the river, and the fish died.

　　2. We often walk in the countryside. It is a(n) _______ activity for us.

　　3. Do not use so much water. It is very _________.

　　4. To keep the flowers growing, you need to _______ them once a day.

　　Listening

　　Listen and check (√) the true sentences.

　　1. It is OK to throw used things away. Looking after them takes a lot of time.

　　2. Do not throw away things made of glass, plastic and paper, but recycle them when possible.

　　3. Take a bag when you go shopping.

　　Discussion

　　Discuss your subject.

　　Take turns to say what you think about the problem and what can be done.

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