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Yes, it’ s dirty. What makes the river dirty? Rubbish makes the river dirty. (兩人一組問答 ) W h a t c a n w e d o t o k e e p o u r c it y c le a n ?我們能為保持城市干凈做些什么?我們能為保持城市干凈做些什么?We can…. What can we do to keep our city clean? Task 4. Listen and answer: What can we do to keep our city clean? We can take the bus and the metro to school. We can walk to school too. We can move some factories away from our city. We can put rubbish in the bin. We can plant more trees. They help keep the air clean. Your ideas are great . Well done, class! 地鐵 move…away from… 使 … 遠(yuǎn)離 … We can plant more trees. They help keep the air clean. We can take the bus and the metro to school. We can walk to school too. We can move some factories away from our city. We can put rubbish in the bin. What can we do to keep our city clean? Task 5. Read and answer: (四人一組朗讀課文 ,并回答問題) We can….