module4 sandstroms in Asia 复习课.ppt

Revision for Module 4 Read the reading and listening material in the 3 minutes before class A B brown-yellow dust Learning Goals After this class, you should be able to: 1.describe a sandstorm in English orally(口头地). 2.write a passage to introduce another natural disaster. 3.know what we should do to improve our environment. 1.What are sandstorms? 2.How strong are they? 3.What happens to traffic? 4.Sandstorms in China appear to have increased in recent years, why? 5.What is “desertification”? definition 定义 damage causes strong ,dry wind / carry sand so…that…see the sun; strong enough to move slowly…make it difficult to see as a result of “desertification” a process…climate changes… cut down…dig up How is the climate changing? Why is the climate getting warmer? Our climate is getting warmer and warmer because of pollution. Gases from cars enter the _________ (大气层)and stop the sun’s heat from leaving the atmosphere. Carbon dioxide from cars is a _____ (主要的)problem. But we have a problem with trees. Trees can _________ oxygen and __________ carbon dioxide. But we are __________ all the trees. Another problem is that we _____ a lot of garbage and once again, the gases not only ______ (污染) the atmosphere but also __________________(对……有坏的影响) our health. global warming atmosphere major give out take in cutting down burn pollute have a bad effect on Why is the climate getting warmer? 1.Gases from cars… 2.Cut down trees… 3.Burn garbage….. 1.When a s_________ comes, the air is full of small d_____ and people have difficulty in walking or riding. 2.Any Chinese c____ must obey the law even if he is not in China. 3.The talk was held in a friendly a________. As a result, an agreement was reached in the end. 4.If you use waste materials again, you r_____ them. 5.When temperature is above zero, ice m_____ and becomes wa