文档介绍：Unit Two TEXT I Beware the Dirty Seas (当心肮脏的海洋)
I. Pre-reading Questions
1. Suggested Answer (SA): It reminds me of a text about the polluted sea and gets interested in the text and occur great concerns on me to our living environment. Every year there is a lot of sewage poured into the seas. The waste of coastal cities, industry and factories’ poisons, etc, cause the seas to e dirty and cause many diseases which threaten people’s lives. Meanwhile, the
I. Pre-reading Questions
seas are important tour places, and mon areas of the countries along them. They play very important roles to the countries and people in the areas, if not treated properly, they will bring great trouble to human beings.
III. Library Work
1. Water pollution is a major element of 20th-century environmental pollution. It includes the accumulation in oceans, lakes, rivers, and streams of physical, chemical, and biological substances that are either directly harmful to life or that have dangerous or harmful secondary and long-range effects. The principal sources of water pollution are sewage, industrial waste, garbage and refuse, and agricultural fertilizers, pesticides, and weed killers. The two chief reasons for the contami-
III. Library Work
nation and exacerbation of the problem are industrialization and urbanization. Industrial wastes include dissolved minerals, toxic chemicals, and sediments. Modern industrial processes have polluted water with certain metals, such as lead and mercury, while agricultural practices do so with a variety of pesticides.
III. Library Work
2. Treatment and control of wastes of all kinds is the only answer to water pollution problems. Pollution can be controlled by building sewer systems, sewage treatment plants, and installations to keep fertilizers and insecticides from entering the water.
IV. Organization of the Text
1. Paragraphs 1 - 4
Introducing the topic: The Mediterranean is the most polluted sea in the world (thesis statement). (1)
Causes and c