Saving the earth 主讲人 : 王春玲 2006/9/21

Senior English Book 2 (A) Unit 9 Saving the earth Lesson 34 (the first period)

P rocedure: Step 1 Revision Check the homework exercises. Step 2 Lead-in 1.A song about the topic we’ll learn today. “ Earth song ” by Michael Jackson (Because it is too long, play it before the class begins.) 2.Some pictures.(show them to the Ss on the screen) Picture 1: an earth with a smiling face (she used to be happy) Picture 2: an earth with a crying face (she is sad now) And ask the Ss why she is sad now.

3.Some more pictures in pairs as comparison. Pair 1: the sea used to be clean and the beach is beautiful but now they are seriously polluted. Pair 2:green grass and thick forests but now only deserts left Pair 3: the sky was blue and clear but now there are a lot of smoke in it and it is no longer blue and clear. 4.Some short videos about different kinds of problems the earth has, including the three mentioned in the lesson – earth problem, air pollution, and water pollution.

Step 3 Presentation The teacher's brief introduction: Today we will deal with the three most serious problems the earth has --– earth problem, air pollution, and water pollution. 1.Pre-reading silently Give the Ss a few minutes to go through the passage as quickly as possible and try to find out the causes and results of the problems. 2.while-reading Passage1: a. Show the Ss a pictures and ask what can be found in it. (The area of the desert of the world is very large and it is growing every year.)

b. a short video about desert c. Question: What are the causes of the problem? Show some pictures to help the Ss to answer the question too many cattle eat all the grass nothing can grow only desert left trees be cut down no trees left to hold… blow …; wash…

Passage2: a. Show the Ss the following pictures. b. Questions : What can you see in the pictures? Why do these things happen? c. a short video about chemical rain d. Ask the Ss to explain the causes and results of chemical rain according to the video and with the help of the following pictures.

how does chemical rain form? smoke from factories smoke from cars e. another reason for air pollution --- serious accident Ask the Ss to tell the stories about the two most serious accidents.

Passage3: a.Show the Ss two pairs of pictures. b.Give the Ss a few minutes to find out the reasons for these changes.

c.Show some pictures to help them. Waste from factory waste form cities d.Another reason for water pollution – accidents Show them the picture a sinking oil tanker tell the story mentioned in the passage.

earth air water factcausesresults desert grow every year be polluted; chemical rain be polluted; diseases cattle ; trees be cut down have less farm land smoke from… ; accidents forests be destroyed; fish be killed ; do harm to people waste from … ; accidents living things be killed ; have less drinking water ; nowhere to swim 3.after-reading 1. Summarize the passage. Fill in the following form.

2.Choose the best answers. 1.Which of the following statements is not true according to the passage? A. Farmers are increasing the numbers of their cattle. B. Farmers are limiting the numbers of their cattle. C. Heavy rains and strong winds are destroying the valuable soil. D.Fewer trees are left to hold the soil in place on the hillside. 2.Air pollution doesn't cause _______. A. the destroying of forests B. the killing of fish in lakes C. illnesses and injuries to people D. the spreading of clouds of radiation 3.What is the possible reason why the Mediterranean can’t clean itself? A.One quarter of the shores are polluted. B. A lot of diseases are present in the water. C. It lies between Europe and Africa. D. It has only one narrow entrance to the ocean.

4. The 1 st part of the passage is mainly about ________. A. the reasons why the area of desert is growing B. the numbers of cattle farmers should keep C. the valuable soil strong winds blow away D. the damage rains and winds bring about 5. If people change their habits, pollution _______. A. can be completely stopped B. will become less and less C. can do less damage to people D.will do no harm to people 6. According to the text _________ are the worst enemy of nature. A. cattle B. humans C. deserts D. chemicals

3.Fill in the blanks with suitable words. 1. The area of desert in the world is growing. One cause of the problem is the increase of the number of _________, which eat up grass. Without grass, land turns into ________. ________ problem is that trees are cut down. There is nothing to ________ the soil. Strong winds also _______ away the soil on the top of the fields. 2. Air pollution comes from factories, power stations and cars. ________ in the smoke from power stations can destroy trees and kill the fish in the rivers, lakes and seas. Time and time again there are serious radiation accidents that ________ the air. Many people were ______ or killed. 3. Waste from factories and cities can also pollute water. Oceans are able to clean ________, but certain seas, once they are polluted, are not able to do so. Lakes also have the same ________. Some lakes have been seriously _______. A lot of diseases are ________ in them, so they are not safe for _________ and lots of animals and plants ___ them have been killed. cattle desertAnother hold blow Chemicals pollute injured themselves problems dirtiedpresent swimming in

Step 4.Further discussion A PROPOSAL 1). Don’t use one-off chopsticks, lunch-boxes and cups. 2). Don’t use paper tissue when you sneeze,use handkerchiefs instead. 3). Don’t send post-cards.Send electronic cards by . 4). Don’t throw rubbish at will. 5). Don’t make a lot of noise. 6). Don’t waste water 7). Don’t waste electricity. 8). Don’t destroy trees and grass. 1. Ask two students to tell their stories.(ask each of them to get ready for one before the class.) 2. Think of the question : Are we causing damage to the earth? 3. What should we do or what should we pay attention to in order to protect and save our earth? 4. Collect their answers and form a propose as following.

Homework 假如你是班长，现在要你代表全班同学给市长写一封信反映学 校前小河被污染的情况。 内容应包括以下几点： 1 。过去河水清澈见底，还有小鱼在水中游来游去。 2 。现在河水又臭又脏，水面上到处都漂着各种垃圾。 3 。河水被污染的原因是沿河几家工厂大量排放污水和沿 河居民乱丢垃圾。 4 。希望政府能采取一些措施来解决这一问题。 5 。 呼吁人们保护我们的环境。 字数： 100 字左右 Dear Major,