下列哪种措施不利于维持生态系统的稳定性（　　）

短文改错。

    One summer evening, I was playing and ____ some childs ____ by a river. We saw a lot of frogs(青蛙) in the water. One of us said, “Let's to see ____ who can Catch most ____ frogs.” Then we began. After while____  we caught a lot. We are ____ having a good time when a farmer shouted at us. “Don't caught ____ frogs!” Then he told us how importance ____ they are to farming. They eat a lot of bad insects(害虫) every year, Caught ____ frogs must be stopped. After hear ____ that, we felt very sorry.

习作

题目：我印象最深的                    

要求：写景，记事，写人，写物，展开想象编故事都可以，题目自定。