题目

In one way of thinking, failure is part of life. In a【1】way, failure may be a way towards success. Edison, the i【2】of the light bulb（灯泡）, made hundreds of models that failed before he found the right way to make one. Once he was asked w【3】he kept on trying to make a new type of battery when he had failed so often, he smiled and said, “Failure? I have no failure. Now I know 50,000 ways that won't w【4】.So what? First, always think about your failure. What caused it？Were conditions right? Were you in top from yourself? What can you change? Then you can decide w【5】t四年级的全体学生参加广播操比赛，排成4路纵队入场，队伍长230米，每队中前后两人相距2米．四年级共有多少名学生？