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Period 4ALook and say 略BListen and write More and more people drive cars. It is bad for the air, because smoke from cars makes the air dirty. Cars use a lot of energy. There is not much coal or oil on Earth. Many rivers are dirty. There are no fish in them. We can’t see trees on many mountains either. Many people don’t have clean water to drink. Everyone should help to protect the Earth.(drive, bad, dirty, use, much, rivers, fish  | 