Unit2 Topic 2 All these problems are very serious.Section C(教案)Teaching aims and demands 1. Learn some new words and phrases:on earth, period, millions of, take away, rise, level, refer to2. Learn more about the harm of pollution and reasons of these kinds of pollution3. Get information by using simple reading strategies4. Develop the students sense of environmental protection. Teaching procedureStep 1 warm up and lead inRead and enjoy the poem treesWe need the trees for shelter, We need the trees to feed us ,We need a place to stay We need them to survive,Somewhere to raise our children, They have all the fruits and leavesSomewhere to hide away. We need to stay alive.You want the trees for paper, You want the trees for timber,You want it every day. You want the wood to build,You use it just a little, But logging is the reasonAnd then throw it all away. A lot of us are killed.- Alan ElderStep 2 Presentation1. Talk about the pictures in 1a and present the new words.掌握 on earth, period, millions of, take away, rise, level refer to理解 carbon, carbon dioxide, ozone layer, pollute, oxygen, radiation, blanket, escape, the greenhouse effect, Mars2. Read 1a quickly and find out the answer to the question:How many environmental problems are mentioned in the passage? What are they?3. Read 1a again and answer some questions:(1), Have we changed our planet in many ways during we lived on earth?(2).People have done something bad to the earth, havent they？(3).why are more and more animals and plants disappearing?(4).Are many rivers and lakes dead now? Why?(5).Whats ozone? Is it good or bad for us? Why?(6) .What problems will the rise of carbon dioxide cause?4. Have a competition. Let students ask and answer more questions according to 1a.Step 3 Consolidation1. Let students choose the best answers according to 1a and finish 1b alone .Finally check the answers. Let students master “refer to” and know about “Mar”2. Let students find out the important and difficult points in 1a, try their best to solve them together. And complete the following exercises.在文中划出下面的句子并分析(1).Some things weve done are very good for the earth while some are bad. 译：_点拨：Some things weve done - 我们已经做过的事情,在句子中做主语 the films theyve seen-_while 并列连词， “而，却” ，表示对照关系。练习 a.她妹妹喜欢唱歌，而她喜欢阅读._b.昨天他们都出去了，而她却留在家里_链接：while- 在时 - 从属连词，常引导含有延续性动词的时间状语从句，表示一个动作在进行的同时，另一个动作也在发生 练习：我做作业时，妈妈正在做饭._while- 一会儿，一段时间 - 名词 常用短语：for a while - 一会儿练习：我们将离开一会儿._(2).When it rains or when the wind blows the earth is taken away. 译：_点拨：take away 拿走，取走 , 句子中是被动语态练习：a. 我不喜欢这些书，请把它们拿走。 _b. They took away everything they like when they left. 译：_拓展：与 take 有关的词组脱下， （飞机）起飞_ 把带到._ 发生_ 乘火车 飞机 公交车_ 轮流，替换_ 捎口信_照顾，照看_ 拍照_ 休息一下_ 坐下_吃药_ 吸毒_锻炼_ 花费时间做某事_(3). The heat from the sun cant escape so the temperature is rising. 译：_点拨：rise - 升起，上升 (不及物动词) 拓展：raise 举起，提起，抬起 筹集 (及物动词)饲养，喂养练习：1)太阳从东方升起。The sun _ in the east.2)河水在慢慢地上涨。The water in the river _ _ _.3)让我们为友谊干杯。Lets _ glasses to _ _.4)He raised his voice to make everyone hear him clearly._3.Read the passage after the tape, pay attention to their pronunciation and intonation.Step 4 PracticeFill in the blanks with the suitable forms of given words:Humans have changed the planet a lot in many ways during this _. People have cut down_ trees. So the earth is _ .Forests have changed into deserts. Air has been _ by cars and buses. Land and water have been polluted because of factory pollution .Ozone is a special kind of _.Its important to us. It can stop harmful _ from reaching the earth. Carbon dioxide has increased a lot. It is like a _ around the earth .The heat cant_, so the temperature is_.It changes the climate of the earth and cause the _ of the ocean to rise.Step 5 Written work1.Discuss what we can do to reduce the pollution and how to be a greener person in groups 2.Write a short passage about it板书设计：All these problems are very serious.Section C. rise level millions of, take awaycarbon dioxide ozone layer pollute, oxygen radiation blanket, fewer treestraffic pllution factory pollutionmore carbon dioxideozone layerwemustdosomethingtostopthemtake away