新视野大学英语视听说教程(第二版)第三册答案(4)

copper, and mercury. These substances may enter the water in such high concentrations that fish and other animals are killed immediately. Sometimes the pollutants enter the food chain and accumulate until they reach toxic levels, eventually killing fish and other animals.

Third, oil pollution. If oil enters a slow-moving river, it forms a rainbow-colored film over the entire surface, preventing oxygen from entering the water.

Fourth, warm water. Industry often uses water for cooling processes, sometimes discharging large quantities of warm water back into rivers. A higher temperature of the water lowers the level of dissolved oxygen and upsets the balance of life in the water. Keys:1.D 2.A 3.B 4.C 5.D

Task3: Curbing carbon emissions

Script:

Although it is not an easy task, China is striving to fulfill the promise to cut its carbon dioxide emissions per unit of GDP by 40 to 45 percent in the next 10 years.

Zhang Guobao, Director of the National Energy Administration, said, "The government puts great emphasis on seeking harmonious development between cities and the environment, and is readjusting the energy structure by giving priority to the