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课件网) Unit 2 Saving the Earth Topic 2 Section C 学习导航 新知学习 课堂小结 当堂检测 学习目标 重点研讨 新课导入 Fill in the blanks using something, anything, others, nobody, everyone, anybody, everywhere, none, other. Review (1)_____ of us knows how to stop the bad behavior. (2) I knocked on the door but _____ answered. (3) Some of these books are better than _____. (4) She was driving the car with one hand and wiping the window with the _____. (5) They are beautiful but I am looking for _____ useful. (6) Is there _____ you can do to help her (7) There’re 5 000 people living here and almost _____ has his/her own car. (8) He’s cleverer than _____ I know. (9) I’ve looked _____ but I can’t find it. None nobody others other something anything everyone anybody everywhere 新知学习 课堂小结 当堂检测 学习目标 重点研讨 学习目标 1. 能熟悉并正确运用本课时的重点单词和短语 2. 能进一步学习各种污染对地球造成的危害 和造成这些污染的原因 3. 能根据不同的阅读目的，运用简单的阅读策略 获取信息 新知学习 课堂小结 当堂检测 学习目标 重点研讨 New words Ozone is a special kind of oxygen. It can protect the earth. ozone layer [ o zo n ler] [ ɑ ks d n] 臭氧 氧气 臭氧层 新知学习 课堂小结 当堂检测 学习目标 重点研讨 People produce lots of harmful chemicals into the air. They cause a big hole in the ozone layer. So the radiation can pass through the hole and reach the earth directly. [ re di e n] 穿过 [d rektli] New words 放射物 直接地 新知学习 课堂小结 当堂检测 学习目标 重点研讨 New words carbon dioxide / kɑ:b n da ksa d/ oxygen / ' k s d n/ CO2 二氧化碳 O2氧气 Trees can breathe in_____ and breathe out_____. carbon dioxide(CO2) oxygen(O2) 吸入 呼出 新知学习 课堂小结 当堂检测 学习目标 重点研讨 形成 / bl k t/ 毯子 / ske p/ 逃离、渗出 It has formed a blanket and the heat from the sun can’t escape. The temperature is rising. rise / ra z/ 上升 But Carbon dioxide has increased a lot. (增加) (热气) New words 新知学习 课堂小结 当堂检测 学习目标 重点研讨 1a Read and understand. Look at the following pictures and predict the main idea of the passage. fewer trees factory pollution traffic pollution the ozone hole more carbon dioxide 新知学习 课堂小结 当堂检测 学习目标 重点研讨 The earth is 4.6 billion years old. We humans have lived on the earth for only 35 000 years, but during this period, we have changed our planet a lot in many ways. Some things we have done are very good for the earth while others are bad. _____ All over the world, people have cut down millions of trees. When it rains or when the wind blows, the earth is taken away. Forests have become deserts, so many kinds of animals and plants are disappearing. Fewer Trees 新知学习 课堂小结 当堂检测 学习目标 重点研讨 _____ In big cities, cars and buses have polluted the air. Now many people in cities have health problems. _____ Factories have also polluted the land and the water. As a result, many rivers and lakes are now dead. _____ Around the earth, there's a specia ... ...
