Why did Mr. Guo laugh in Xu Tong's article about protecting trees?

In the article "Xu Tong's punch line to protect the tree", Mr. Guo smiled, because Xu Tong answered Mr. Guo's inquiry with clever language, which made Mr. Guo appreciate himself more.

1, Mr. Guo asked Xu Tong that the boy was a young seedling and was bullied by urchins. The literal meaning of this question is that you belong to children, but you are bullied by other children. What happened? Faced with this question, Xu Tong did not show timidity or humility, but answered the question tactfully. He didn't lie when he said what children said. This answer not only answered Mr. Guo's question, but also expressed Xu Tong's own belief that his words were true, honest and credible.

Mr. Guo asked about the tree again. The literal meaning of this question is, what about this tree? This is a further investigation of Xu Tong. Faced with this problem, Xu Tong once again showed his wit and cleverness. He said the tree was big and straight. This answer not only expresses his views on this tree, but also implies his confidence in himself-he believes that his growth will naturally become as strong and tall as this tree.

Mr. Guo was very satisfied with Xu Tong's answer, so he smiled. This laughter expressed Mr. Guo's appreciation and recognition of Xu Tong, and also showed his appreciation of Xu Tong's wisdom and agility.