How to write a composition about Tao Tao Expo?

People are always coming and going in the market, and the voice of bargaining is endless. ...

Today, my mother and I went to the market to buy things. A sea of people and a lot of noise. We went to buy watermelons, and my mother asked, "How much is a catty of watermelons?" The watermelon seller said, "Two and a half dollars". Mom said, "Why is it so expensive? Others only sell two pieces. " Uncle said, "This is the finest watermelon brought back from my hometown. I watch them grow up every day. Two and a half dollars is very cheap. If you don't believe me, buy it and try it. Very sweet. " Mom bargained and said, "Let's sell it for two dollars." Uncle hurriedly bargained: "No, no, two and a half, two and a half, or not to sell ..." Mother and uncle bargained. Finally, I bought it for two dollars and three cents. The first time is really not easy for me! Whether it's mom or uncle who sells watermelon.

The number of people who go to the market to buy things in the morning changes from less to more, and from less to less at night. The haggling sound in the market in the morning is morning song, and the haggling sound in the market at night is nocturne. Every day, people come and go in the market, and bargaining sounds come and go, and it is very lively everywhere.

Observe the market carefully and you will find its significance.