《2025年53天天练六年级英语上册译林版》

Our city is beautiful now, but it was once dirty. Black smoke from cars made the air dirty. Black water from factories made the water dirty. Rubbish made the streets messy.
What can we do to keep our city clean? We can take the bus and the metro. We can plant more trees. We can also put rubbish in the bin.

答案： 示例:Our city is beautiful now, but it was once dirty. Black smoke from cars made the air dirty. Black water from factories made the water dirty. Rubbish made the streets messy. What can we do to keep our city clean? We can take the bus and the metro. We can plant more trees. We can also put rubbish in the bin.