Unit 2 Topic 2 All these problems are very serious. Section B Teaching aims and demands2. Learn to talk about the sandstorm and its harm. 1. Learn some new words and phrases: sand, desert, sandstorm, cut down, change into , prevent from. Step1 Check wordssanddesertsandstorm,cut downchange into prevent from human being although沙子沙子沙漠沙漠沙塵暴沙塵暴砍倒砍倒把把.變成變成阻止，防礙阻止，防礙人人雖然雖然Step2 Lead-inWhat causes sandstorm?What kind of pollution are they talking about?What causes it ?They are talking about the sandstormsPeople have cut down too many trees.Step3 listen, read and sayTask1 listen and answerTask 2 Listen and repeat1 People have cut down too many trees. 2 A lot of rich land has changed into desert.3 Trees can stop the wind from blowing the earth away. They can also prevent the water from washing the earth away. 4 Although we have built the Great Green Wall, we still need to work hard to protect the environment. change into:把把.變成變成 砍倒砍倒 stop/prevent sb/sth (from) doing sth 阻止阻止 某人某人/某物做某事某物做某事 相當(dāng)于相當(dāng)于though， 引導(dǎo)讓步狀語引導(dǎo)讓步狀語從句。從句。 不能和不能和but連用連用Dont _ _ (砍倒)any trees.Our school _ _ _(變成) my home.The government the people (from)_ _ trees.(阻止人們砍樹)_ my uncle is old, _he looks very strong and healthy. Task 4 Finish the sentences cut downhas changed into prevents /stopscutting downAlthough / Step4 Pair workDo you know the relations between trees, human beings and sandstorms? Number the pictures and make your own story in pairs( 4 )( 1 )( 5 )( 3 )( 6 )( 2 )MAKE UP A STORY ACCORDING TO 1CYou can start it like this : long long ago, there were many trees in my hometown the air was fresh and the water was clean but one day long long ago, there were many trees in my hometown. They can prevent the wind from blowing the earth away.The air was fresh and the water was clean. But one day some people came to my village. They cut down a lot of trees for wood. The forest was gone soon. The water washed the earth away and a lot of rich land changed into desert. As a result, sandstorms came into being.STOPING SANDSTORMThe sandstorm is very terrible. As a student, what should you do to stop sandstorm?Step5 DiscussionStep6 Practice Make a new dialogue about water pollution Whats the water like now? What cause water pollution? How to protect and save water? Writing1: How to stop sandstorm 1 Whats the weather like now? 2 What cause sandstorms?3 How to stop sandstormWriting2: How to save waterStep7 Homework1. Our teacher have told us _ the trees. A. cut off B. cut down C. not to cut off D. not to cut down2. _ they can swim, _ they never go swimming alone. A. Although, but B. Though, but C. Although, / D. Because , so HOMEWORKDC3.The policemen tried to prevent traffic accidents _ happening. A. from B. in C. to D. with 4.He didnt cross the road until the red traffic lights changed _ green ones.A. to B. into C. for D. in 5._ bad weather! We have to stay at. home.A. What a B. How C. How a D. What ABD Thank you goodbye