Dad and son

One day, my father took his son to the small tree in front of the door and measured his height. His father made a mark with a nail. One day, one week, one month... In this way, one year has passed. In the second year, the father still wanted to measure the height of his son, so he took him to the small tree in front of the door. A quantity, hey, my father was shocked and said with a sigh of relief: "Son, why didn't you grow taller and still become shorter?" The son said with a smile: "Dad, this is not because I am not tall, but your method is wrong. You see, I grow taller, but the little tree is too long! This shows that it grows faster than me."

First grade: Xiaoyang 2013