Unit 13 We’re trying to save the earth（第1课时）
本学期第    课时  本单元第  1  课时    上课日期：_________
教学目标：  
一、 目标
(一)、 能掌握以下单词和短语：
To learn the following words and expressions.
bottom, coal, p ublic, ugly, cost, advantage, method, cruel, harmful, afford.
二、 教学重点
 1. How to use the following words and ex pressions: cost, advantage, harmful, afford, used to, play a part in…
 2. to understand the passage on  Page 99.
三、 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.
情感态度和价值观
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.
教学过程:
Step 1 Lead-in
1) Show so me pictures about pollution and ask students to discuss what’ s the danger  of each kind of pollution.
2) H ere are some words are related to different kinds of pollution.  Write them in the box below, and you c an add more words.
loud music, littering, building houses, cars, ships, mobile phones, rubbish, fa ctories, planes, smoking.
Air pollution  Noise pollution Water
 
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 pa rt in cleaning it up.
Step 2. Reading
1) Fast-reading
Now turn to page 99 and read the page quickly to find a nswers to the sheet.
2) careful-reading
3) Studying useful words  and expressions.
 ① 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..
Badges are also available at a cost o f £2.50. 徽章也有卖的，2.5英镑一枚。
It's going to cost me over $100,0 00 to buy new trucks.
买几辆新卡车将花掉我10万多美元。
② 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。
③ 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 di shes in a restaurant.她曾经在餐馆里洗过盘子。
④ afford vt.买得起；担负得起；提供；给予
We couldn't afford to buy a new car. 我们买不起新的车。
We can't affo rd to wait. 我们等不起。
My parents can't eve n afford a new refrigerator.
我父母甚至买不起 一台新冰箱。
⑤ play a part in扮演某角色; 与…有关，对…有影响
I'd like to play a part i n 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。

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