Tang Xi didn't expect the teacher would call her to answer the question. She was still dazed when she stood up, but she quickly adjusted herself and asked the teacher, "Mr. Li, do you want me to write the answer to this question on the blackboard?"
Mr. Li thought she didn't know the answer, so he said, "If you don't know the answer, I'll explain it to you…"
"Okay, I see." Tang Xi left her seat, went to the platform, took a piece of chalk and began to write the answer on the blackboard. Pretty soon, a detailed answer appeared on the blackboard step by step. Tang Xi checked her answer carefully before asking Mr. Li, "Mr. Li, did I answer it correctly?"
Mr. Li nodded blankly and replied, "Your answer is right." But this question involved contents that hadn't been taught yet. How could she know the answer?
Tang Xi nodded, went back to her seat and continued to be in a daze, not realizing how the math teacher was shocked by her.
