(
课件网) Unit 2 Saving the Earth Topic 2 All these problems are very serious. Section A 掌握重点词汇和短语： sand, although, sandstorm, desert, human being, reduce, completely, change into, stop … from, blow/ wash … away, as a result等。 2. 能听懂谈论沙尘暴成因的对话。能够从所听材料中获得有效的细节信息。 3. 掌握动名词做主语，“防止...做...”的几种表达。 4. 通过课文的学习，让学生了解沙尘暴形成的原因和过程，关注全球的环境问题。 Learning aims: Do you know how sandstorms come into being wash the earth away many trees change into desert forests gone sandstorms come into being cut down trees Pre-listening The forests have gone and the rain washes the earth away. Then there is a sandstorm. wash away 把...冲走 sandstorm ['s ndst :m] n.沙尘暴 拓展：blow away 把...吹走 rainstorm 暴风雨 snowstorm 暴风雪 This land has changed into desert because people have cut down too many trees on it. desert //d 'z t/ n. 沙漠/d 'z :t/ v. 舍弃，遗弃 区分：dessert [d z rt] n. 甜点 New words 1.sand [s nd] n. 沙 2.sandstorm [ s ndst :m] n. 沙暴 3.change into 转换成，变成（turn into) 4.desert [ dez t] n. 沙漠 v. 舍弃，遗弃 5.human being 人 6.although [ :l u] conj. 虽然，尽管，即使 7.reduce [r dju:s] v. 减少，减轻 沙暴 人 转换成 减少 彻底的 沙漠 虽然 沙子 While-listening 1b Focus on the main idea of the conversation when you listen for the first time. The boy and girls are talking about . different types of sandstorms the reasons for sandstorms sandstorms in different cities Listen to 1a and choose the best answer. 1c Read 1a and complete trees’ functions. Tree’s functions _____ A lot of water can be saved by forests. _____ Trees can stop the wind from blowing the earth away. They can also stop the water from washing the earth away. 教考衔接 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 _____. bad cut down stop from be saved washing away Listen to 1a again and fill in the table. Group work. Read 1a and find the phrases. 3.变成 change into = turn into 4.阻止某人做某事 stop sb. from doing sth 1.砍到 5.吹...走 6.冲走 7.许多 8.形成、开始、产生 cut down blow away wash away a number of... come into being 2.结果 as a result 10.灭绝、消失 die out 9.处于...的危险 in danger of 12.尽某人最大努力做某事 try one’s best to do sth 11.大量 plenty Look, listen and say. 1a What a strong wind! (Kangkang, Maria and Jane are talking in a room. The wind outside is blowing strongly.) Yes. But it’s better than the last few years. There were sandstorms before. While I was walking down the street, I couldn’t see anything. The sand really hurt my face. Why was the weather so bad People cut down too many trees. As a result, a lot of rich land changed into desert. ... ...
