1、Unit 4,Global warming,学习目标展示,知识目标 单词 重点掌握,识记理解,知识目标 短语 新学掌握,温习巩固,能力目标,背景知识链接,People and the sources of air pollution are found in the same places.This means that cities with large populations have the biggest problem of dirty air.Air pollution is caused by many different things.A major source of air
2、 pollution is the gas fumes from cars.Statistics show that 93 percent of all auto trips are within cities.Another major source of dirty air is the burning of coal and oil for energy.This energy is needed to make electricity.Of course, much more electricity is used in the city than in the country.,On
3、 the average, we throw away more trash and garbage than the year before.The burning of garbage contributes to air pollution. Many major industries are also responsible for the dirty air in the around cities.The fumes from iron，steel，chemical，and petroleum production add particles to the air.,The eff
4、ects of air pollution range from mild headaches to death. The levels of pollution found in heavy for traffic may cause headaches for loss of clear vision.Wherever coal and oil are used for fuel, fumes may kill trees and plants and cause metal to corrode.In some of the larger cities, these fumes enda
5、nger the live of human beings by contributing to lung diseases and causing early death.,.阅读短文，判断正(T)误(F) 1The purpose of this passage is to persuade people to stop polluting the air. (_) 2Air pollution is more grave in the city than in the country because there are much more gas fumes from cars and
6、burning of coal and oil for energy in the city than in the country.(_) 3The fumes from coal and oil may cause metal to turn black.(_) 4In larger cities, the fumes from coal and oil may contribute to heart disease. (_),F,T,F,F,.佳句仿写 1诚实加苦干有助于成功和幸福。(仿句) Honesty and hard work _. 2这个汽车旅馆的房价每天从三十美元到五十美元不等。(仿句) The room rate at this motel _ per day.,contribute to success and happiness,ranges from $30 to $50,
