2013年12月四级听力模拟试题十四_大学英语听力

2013年12月四级听力模拟试题十四

　　So, if we want to stop this pollution, the answer is simple: sewage and industrial waste must be made clean before flowing into the water. It may already be too late to save some rivers and lakes, but others can still be saved if the correct action is taken at once.

　　Questions 29 to 31 are based on the passage you have just heard.

　　29. What are the main sources of water pollution?

　　30. Which of the following is harmful according to the passage?

　　31. What correct action should be taken to stop water pollution?

　　Passage Three

　　I dont often lose things and Im especially careful with money, so I was quite surprised when I reached for my wallet and it wasnt there. At first, I thought it was possible that I could have left it at home. Then I remembered taking it out to pay for the taxi, so I knew I had it with me just before I walked into the restaurant. I wondered if it was possible that it could have slipped out of my pocket while I was eating dinner. Thinking about that possibility, I turned and walked back to the table where I had been sitting. Unfortunately, there were several people sitting at the table at the time, so I called a waiter and explained to him that my wallet had fallen out of my pocket while I was sitting at the table a few minutes earlier. I had the waiter go over to the table to see if my wallet was on the floor.