大学英语听说3Unit 2.docx

大学英语听说3Unit 2 Unit 2II. Basic Listening Practice1. ScriptM: Now we have satellite and high-powered microscopes, it’s easy to think we know everything about the world; but we still don’t understand EI Nino.W: Right. Even the scientists are uncertain about the exact cause of the warm Pacific current that brings storms or drought—the mysterious EI Nino. Q: Which of the following is true according to the conversation? B) Even scientists cannot understand EI Nino.2. ScriptM: Everyone is talking about environmental problem: acid rain, greenhouse effect, holes in the ozone layer. We should think positively. What can we do to improve things?W: I agree. We could do a lot more to harness the sun’s energy for heating and lighting in our homes. Millions of solar roofs are now emerging in Japan, the U.S., Italy, and Germany.Q: How do the man and the woman view the environment? D) Both the man and woman think positively about it.3. ScriptW: We lived in Beijing some years ago. It was always difficult to keep the house clean with the wind from the north blowing sand from the desert.M: That’s why the Chinese government has been encouraging people to plant trees along the edges of the Gobi Desert. Now those trees act as wind barriers. Q: What have the Chinese people been encouraged to do? A) To grow trees.4. ScriptM: Many old refrigerators and cars are environmental hazards because they contain CFCs that destroy the ozone layer.W: Yes, but government organizations are helping people to safely dispose of old refrigerators or, in the case of cars, to upgrade their air conditioning. Q: What are government organizations helping people to do? A) To treat old electrical appliances safely.5. ScriptM: Hey. That’s an aerosol spray you’re using on your hair! Build a bomb or set fire to the apartment to kill us quickly instead of making holes in the ozone, so we die of cancer.W: Cool it. This spray doesn’t contain CFCs. And you’d better read a little more. 1Q: What does the man mean?C) The woman should not use an aerosol spray.III. Listening InTask 1: We should have proper respect for nature!ScriptMartha: Do you think most people in your culture respect nature? Ed: I think so. Um… more now than before.Martha: What do you think is the most serious environment problem in the worldtoday?Ed: Today…I think damage to the ozone layer is a big problem, and anotherproblem is pollution in big cities and things like that.Martha: How do you learn about environmental problems?Ed: Um… through school. A lot of clubs promote environmental safely, andsome TV programs, too. They talk about environmental safely and stuff like that.Martha: Do you think students should learn more about the environment at school? Ed: I think so. So, as they grow older, they can be more aware of all theproblems that are going on, and prevent more problems from occurring.Martha: If you could create a new law to help the environment, what would it be? Ed: A new law for the environment? Um…I’d probably say that when peoplethrow away their cigarette butts, they have to throw them into the garbage bin, not just throw them everywhere because it’s just littering and I hate that. So they should be fined if they throw them on the floor on the ground.Martha: That’s a good idea. What do you personally do to help protect theenvironment?Ed: I’ m so against littering. I never litter. If I see somebody litter, I get reallyangry. So I always throw my trash into the garbage bin. Key: (1) nature(2) environmental problem (3) pollution (4) promote (5) aware of(6) from occurring (7) law(8) throw away (9) fined (10) trash 2Task 2: River pollutionScriptIf you see dead fish floating on the river or notice that the water is discolored and smelly, you know the river has been polluted, and there are four main possible causes for it.First, fertilize. If large amount of fertilize or farm waste drain into a river, the concentrations of nitrate and phosphate in the water increase considerably. Algae use these substances to grow rapidly, turning the water green. This massive growth of algae leads to pollution. When the algae die, they are broken down by the action of the bacteria, which quickly multiply, using up all the oxygen in the water and therefore causing the death of fish.Second, industrial waste. Factories sometimes discharge chemical waste into rivers. Examples of such pollutants include cyanide, lead, copper, and mercury. These substances may enter the river in such high concentrations that fish and other animals are killed immediately. Sometimes the pollutions 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 。