引导学生想象和回想沙尘暴发生时的场景并准确地描述出来。活动二的判断正误可以使学生对当今地球的环境恶化有个更深地了解。最后的小组讨论活动涉及人们在沙尘暴中的自我保护和对改造环境能够作出什么样的努力。学生通过本节课的学习, 能够对沙尘暴这种天气现象作出准确的描述并能分析其原因和给出解决方法。

　　三维目标

　　1. 知识与技能

　　1)Make students master some new words.

　　2)Encourage students to know how to describe a sandstorm.

　　2. 过程与方法

　　Train students' speaking ability through individual and pair work.

　　3. 情感与价值

　　Get students to know the harm that sandstorms do to human beings and try to develop their sense of environment protection.

　　教学重点

　　Get to know some information about sandstorms and encourage students to use their own words to describe them.

　　教学难点

　　Learn some new words and other information about sandstorms.

　　教学方法

　　Individual work, pair work to get every student to participate in class.

　　教学过程

　　→ Step 1 Background about the topic of this module

　　1. Talk about the topic of this module as an introduction.

　　Show the following passage to students on the screen.

　　About Sandstorm

　　The topic of this module is "environmental conservation"(环境保护). This module mainly introduces something about the sandstorms in Asia, especially in China. At the same time, it brings in some words about sandstorms and environmental conservation.

　　What is a sandstorm? A sandstorm, a kind of disastrous(灾难性的)weather system, is a combination of sand and strong wind.

　　What on earth causes sandstorms? In my opinion, severe sandstorms are usually caused by both natural and contrived(人为的)factors, that is, climatic, geographical, social and human factors. Of all the factors, the overuse of natural resources, such as cutting down too many trees and opening up too much untouched land, leads to the frequent occurrence of sandstorms.

Where does a sandstorm usually go? As mentioned above, disastrous as it is, a sandstorm does not go everywhere, coming to only those places with dry weather and little vegetation(植物的总称, 植被). Take China for example, in the northwest of China, where there is little forest, sandstorms are worsened with(因为......而恶化)people's activities like digging up grass and