《lesson 5 Silent Spring》.pptVIP

Lesson 5 Silent Spring Vocabulary tree Warm-up Please look at the pictures and say something about environmental pollution. Warm-up Air pollution includes all contaminants found in the atmosphere.? These dangerous substances can be either in the form of gases or particles. Warm-up Human created noise harmful to health or welfare. Transportation vehicles are the worst offenders, with aircraft, trucks, buses, automobiles, and motorcycles all producing excessive noise. Pollution refers primarily to the fouling of air, water, and land by wastes. Thus litter, billboards, and auto junkyards are said to constitute visual pollution; noise excessive enough to cause psychological or physical damage is considered noise pollution; and waste heat that alters local climate or affects fish populations in rivers is designated thermal pollution. The 20th century has seen pollution approach crisis proportions throughout the world. Rachel Carson and Silent Spring(from: Wikipedia) Silent Spring Turns Fifty! Structure of the text Part 1: 1-2 How did the author describe the beautiful scenes of the town? Part 1:1-2 What town was the author referring to? Do you think her lyrical descriptions of the town were too exaggerated? Why did she paint such a rosy picture of this place before the ecological disaster? Part 2: 3-5 What is the topic sentence in this part? Then some evil spell settled on the community. Part 2: 3-5 What puzzled the doctor? What happened to the birds, fishes, plants and trees? What were the roadsides like? Part 3: 6-9 What had caused all these? Part 4: 10-23 The history of life on earth has been a history of interaction between living things and their surroundings. (10) Part 4: 10-23 Considering the whole span of earthly time, the opposite effect, in which life actually modifies its surroundings, has been relatively slight. (10) Part 4: 10-23 What negative effects of pollution did the author describe? 1. This pollution is for the most part irrecoverable. 2. Chemi