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听下面一段材料,回答第1-5小题。 1. How many kinds of pollutions are mentioned in the passage? [ ] A. 2 B. 3 C. 4 2. pollution makes us become angry more easily. [ ] A. Air B. Water C. Noise 3. Most air pollution is caused by the dirty smoke let out from . [ ] A. hospital B. hotel C. cars and factories 4. New laws are being made to . [ ] A. protect the environment B. pollute the air C. fight against the factories 5. The speaker calls on to keep our country clean and make it more beautiful. [ ] A. the listeners B. all the people C. the students