(一)A It’ s not WASTE until it is WASTED!With the World Env ironment Day coming, our school is now requiring ev ery student to form a habit of sorting (分类) the waste. Here in our schoolyard we place four different colors of rubbish bins for different kinds of rubbish. The red is for harrmful waste, the blue is for waste that can be recycled, the green is for kitchen waste, the yellow is for other waste.