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.

右图为某生态系统食物网的示意图。该食物网中（）

下列“QQ表情”中属于轴对称图形的是（　　）