英语必修三外研版 Module4 Sandstorms in Asia(共17张PPT).ppt

1、SandstormThere is strong,dry wind and the sky is yellow.the visibility dropsIts dangerous for us to go outpeople have to wear hoods,masks and glassescars slow down and have to turn on headlightSometimes delay the flightsIt spreads illnessWhat happens?major sandstorm centers in ChinaGansu and Western

2、 Inner MongoliaBeijing and Northeast Inner MongoliaDiscussion:1.Whats the cause of sandstorm?2.What should you do in a sandstorm to protect yourself?The cause of sandstorm:cutting down too many trees;desertification(沙漠化);high temperature and little rain;serious air and water pollution;the growing po

3、pulation of the world;improper of land;rapid spread of urbanization;Introduction-1Complete the sentences using the correct form of the words.blow bury frightening last(v)sandstormThe wind _ the sand high around the house,and some cars were almost completely _ by the sand.blowingburysandstormhas been

4、 blowing/has lastedfrightening There has been a _.It has _ for ten hours and was very_.Introduction-2Check the meaning of these words.Now,work in pairs.Discuss these statements and decide which statement is falsedig earthquake protect sign the Pacific OceanIntroduction-2Check your answers:1.Sandstor

5、ms begin in desert areas.2.Deserts are created by climate changes.3.Deserts are also created because people cut down trees and dig up grass.4.Sandstorms from Asia have blown across the Pacific Ocean to America.5.Sandstorms cant be prevented.6.The inland region has more sandstorms than the one near t

6、he sea.Introduction-3Work in pairs.Discuss the questions.1.What should you do in a sandstorm to protect yourself?2.Which do you think is more dangerous,an earthquake or a sandstorm?Say why?3.Where in China do sandstorms begin?4.If you are in a desert,what is the first sign of a sandstorm?5.Have you ever been in a sandstorm?If yes,describe it to your partner.Homework:1.Recite the new words2.Preview the reading part-read the text