时针从3走到6是15分钟．______．
时针从3走到6是3小时，不是15分钟；
故答案为：×
家庭是我们成长的摇篮。这是因为[ ]
①家庭是我们的天然学校②父母是我们的第一任老师③家庭是我们接触的第一个小社会④家庭是社会的细胞
A．①②
B．②③
C．①②③
D．①③④
A box contains 100 balls, numbered from 1 to 100. If three balls are selected at random and with replacement from the box, what is the probability that the sum of the three numbers on the balls selected from the box will be odd
