Last Sunday， my mother and I went to a park on foot。 At first， both my mother and I were very happy。 But I became unhappy and angry after I found there was some litter lying on the grass。 At the same time， I saw a man throwing a plastic bag on the road。At once， I told him to pick it up， but the man did nothing after he had heard what I said just now。 It made me even angrier。 I picked it up and threw it into a dustbin。
After I went home， I thought it for a long time。 I think people mustn’t throw about in public places。 We should do something useful to improve the environment。 Because the environment is one of the factors which can decide how long we can live in the world。 So to protect the environment is just to help ourselves。
(指导老师 陈珍慧)