外研社英语必修三 module 4.ppt

* Please look at these pictures. How beautiful they are! But one day something happened. There is strong, dry wind and the sky is yellow. The sand almost buries the car. What natural disaster is it? It is a __________. It is very __________. sandstorm frightening Look at the picture below and complete the sentences using the correct form of these words. There has been a __________. It ____ _____________________ for ten hours and was very ___________. The wind ___________ the sand high around the houses, and some cars were almost completely ______ by the sand. sandstorm lasted /has been blowing frightening was blowing buried has blow bury frightening last (v) sandstorm Check the meaning of these words and discuss which statements are true. dig earthquake protect sign the Pacific Ocean 1 Sandstorms begin in desert areas. 2 Deserts are created by climate changes. 3 Deserts are also crested because people cut down trees and dig up grass. 4 Sandstorms from Asia have blown across the Pacific Ocean to American. √ √ √ √ 5 Sandstorms can’t be prevented. 6 The inland region has more sandstorms than the one near the sea. √ 1. What’s 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 population of the world; improper use of land; rapid spread of urbanization. We shouldn’t go out. We have to wear hoods, masks and glasses. Cars slow down and have to turn on headlight. What we should do in a sandstorm to protect ourselves: Can you guess the words from these definition? 1. to ride a bicycle ________ 2. someone who knows a lot about a particular subject __________ cycle expert 4. someone who lives in a particular town or country __________ citizen 5. very small bits of dirt or earth, on the ground or in the air