Jeremy Lin has scored 166 points in seven games and his fame is sweeping the US, which means that his career has _______.

A．paid off

B．taken off

C．put off

D．call off

在一个按行优先顺序存储的二维数组(M×N)中，假设数组的基地址是P，并且数组的每一个元素所占的存储空间为d个字节，则a[_ij的地址计算公式为______。