2. No, because the second paragraph is about Xiang Yu, the third paragraph is about Liu Bang, and the contents quoted and discussed in the fourth paragraph correspond to the order of the second paragraph, which reflects the rigor of the argumentative structure.
3. First, use the old saying as the argument of truth, and then use two examples of learning books and medicine as the argument of facts to explain and demonstrate the central argument; Finally, take the old proverb as the fine argument, and demonstrate the central argument again.
4. Example 1: In the process of inventing the electric light, Edison made numerous experiments, constantly summed up experiences and lessons in failure, and finally succeeded.
? Example 2: Failure is the mother of success.