高一英语unit4 earthquakes 浙教版.ppt

* Unit 4 Warming up , Pre-reading Listening (Wb) flood typhoon earthquake volcano drought natural disasters fire sandstorm Have you gone through any natural disaster? What damage did it cause? Where? When? How serious? typhoon, drought, earthquake, volcano, flood… So it may cause great damage to a city which suffer from natural disaster. Tangshan and San Francisco, Discussion: What might happen if there has been a big earthquake in these two cities? broad roads beautiful gardens tall buildings large population People lose their homes. Many buildings are destroyed. Roads get huge cracks. The bridges fall down. Steam burst from holes in the ground. Water pipes are destroyed. The railway tracks are useless pieces of steel. The whole city lies in ruins. Can we avoid( 避免)or reduce (减少)the damage? We can foretell(预测) earthquakes. How to foretell an earthquake? What may happen before an earthquake? Let’s look at some signs(前兆). signs(前兆). 1.People see bright lights in the sky. 2.Animals are too nervous to eat. 3.Mice run out of the fields for places to hide. Fish jump out of the pond. 4.The well walls have deep cracks in them. How does an earthquake happen? *