It's eight o'clock in the morning, and school has already started. Teachers and students are discussing biology in the classroom. They are going to go on a field trip to study the environment. Teachers and students are riding bicycles and talking about all kinds of things. The students are very interested in the discussion. At noon, they arrived at the mountain and began to plant trees there. After planting trees, the two girls began to pick up garbage, saying, "Reduce, reuse and recycle!" "

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