题目

甲、乙两同学在高考前各作5次立定跳远测试,测得甲的成绩如下(单位:米):2.20,2.30,2.30,2.40,2.30.若甲、乙两人的平均成绩相同,乙的成绩的方差是0.005,那么甲、乙两人成绩较稳定的是_______________. 答案：解析：求得甲的成绩方差是0.004＜0.005.答案:甲的成绩较稳定Pay as much attention to the things that are working positively in your life as you do to ______ giving you trouble. A．these            B．ones             C．what             D．those