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课件网) Unit 2 Saving the Earth Topic2 All these problems are very serious. Section A 学习目标：1、熟记新单词，学会运用新短语； 2、学习不定代词和不定副词。 情感目标：了解沙尘暴的形成及其危害，认识树木的重要性， 提高环保意识。 教学重点：初步感知不定代词和不定副词的用法。 教学难点：能够根据图片和信息提示词描述沙尘暴形成的过程。 Teaching aims 检查预习稿 （1）刮大风 （2）过去几年_____ （3）结果_____ （4）砍伐太多的树木_____ （5）大量富饶的土地_____ （6）变成沙漠_____ （7）阻止大风刮走泥土_____ （8）阻止流水冲走泥土_____ （9）对人类有害_____ （10）绿色长城_____ （11）造成沙尘暴的原因_____ （12）许多、大量_____ （13） 灭绝、消失_____ （14）……的重要性 _____ Lead in Watch the video and see what happened to our earth. sandstorm snowstorm rainstorm What kind of weather is it Do you know how sandstorms come into being 你知道沙尘暴是怎么形成的吗？ It’s a kind of storm caused by sand. Pre-listening √ Long ago, there were lots of trees and forests. But h_____ _____ needed some wood to build houses and do other things, so they cut down the trees day by day. cut down many trees uman beings Use the new words forests gone wash the earth away The forests _____ _____ and the rain _____ the earth _____. washes away have gone change into desert 转换成，变成 沙漠 A lot of rich land has _____ _____ desert because people have cut down too many trees. changed into sandstorm As a result, the s_____ come into being andstorms 给沙尘暴的形成过程排序 ( ) ( ) ( ) ( ) ( ) ( ) 4 1 5 3 6 2 wash the earth away many trees change into desert forests gone sandstorms come into being cut down trees 3 Do you know how sandstorms come into being The boy and girls are talking about _____. different types of sandstorms the reasons for sandstorms sandstorms in different cities 1b Listen to 1a and choose the best answer. B Pre-listening 1. What is the weather like It’s _____.The wind is blowing strongly. 2. What causes these sandstorms People have_____ _____ too many trees. 3. How can trees affect the weather (1) Trees can ____ the wind_____ blowing the earth away. (2) A lot of water can ____ _____by forests. (3) Trees can prevent the water from _____ the earth _____. Listen to 1a and fill in. bad cut down stop from be saved washing away 1c Read 1a and complete trees’ functions. 阅读1a找出树的作用 Trees can stop the wind from blowing the earth away. A lot of water can be saved by forests. They can also stop the water from washing the earth away. Tree’s functions Role play: Act out the dialog in pairs. Key points 1.Trees can stop the wind from blowing the earth away. They can also stop the water from washing the earth away. 点拨：stop sb./sth. (from) doing sth. = prevent sb./sth. (from) doing sth. --阻止…做某事 (from可以省略) 同义词组 keep sb./sth. from doing sth. -- 阻止…做某事（from不能省略） 练习：We should stop/prevent humans from (destroy) the environment. destroyed 2.It is harmful to human beings, animals and plants. 点拨： ... ...
