题目

Three simple keys to successBeing successful means different things to different people.【1】 My point is, the specifics involved in finding success can vary greatly, depending on your goal.There are three basic components necessary for finding success, regardless of the specifics of your pursuit. And, since the desire for ownership is the driving force behind acquisition, I’ll use the word OWN as my simple three-item method for success:1.O-Opportunity: One of the most important components in finding success is being able to identify opportunity. It is to success what wind is to sailing. 某中学初二年级抽取部分学生进行“足球科普知识”测试，测试成绩从高分到低分以A、B、C、D等级表示，测试结果整理绘制成如下两幅不完整的统计图．请根据图中信息，解答下列各题：（1）参加这次测试的共有 人；在扇形统计图中，“A级”部分所对应的圆心角的度数是 度；（2）补全条形统计图；（3）如果该校初二年级的总人数是600人，根据此统计数据，请你估算该校初二年级学生对“足球科普知识”了解层次达到成绩为“B级（含B级）”以上的人数．