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课件网) Module 4 Sandstorms in Asia Para 1: Measures Para 2: Effects Para 3: Introduction Para 4: Causes Para 5: Definition Para 6: Suggestions Para 1: Introduction Para 2: Definition Para 3: Causes Para 4: Effects Para 5: Suggestions Para 6: Measures Raise a problem Analyse the problem Solve the problem 1 5 4 3 2 6 1) Sandstorms which sometimes affect Beijing can be forecasted some months before arriving in Beijing. Back to competition 2) Land becomes desert only because people cut down tress and dig up grass. 1. Choose the best answer. Sandstorms are strong winds carrying _____ through the air. A. dirt and mud B. rain and heat C. sand and dust D. cloud and snow From the last paragraph we know _____. A. the government won’t plant trees any more in five years B. the distance between the desert and the center of Beijing is only 250 kilometers C. more than 30 million trees have been planted in Beijing D. the government is taking measures to prevent sandstorms 2. Choose the best answer. Back to competition Why did traffic move slowly in sandstorms Because the thick dust makes it difficult to see. Back to competition What do the experts advise people to do when a sandstorm arrives in the city A. Don’t go out B. Don’t wear masks. C. Don’t go to work as usual. D. Don’t ride bicycles What are the four main places where there are sandstorms in the world and find them out on the map. B C D A North America Central Africa Australia Central Asia Back to Competition This is a process that happens when land becomes desert because of climate changes and because people cut down trees and dig up grass. Back to Competition 沙漠化是由于气候改变或者人类砍伐树木、铲除草皮而使陆地变成沙漠的一个过程。 To have been caught in a sandstorm is a terrible experience. To be cycling in a sandstorm is frightening. To prevent it coming nearer, the government is planting trees. Back to competition Discussion: What measures should we take to prevent sandstorms coming Green fences forecast Innovation，Coordination, Green, Opening and Sharing Homework: Design a poster that encourages people to protect the environment.
