在教育工作中我们要“一把钥匙开一把锁”，这是遵循了人的发展的( )。

A．个别差异性

B．稳定性

C．不平衡性

D．顺序性

It was in the factory ________the TV sets were produced________ we met for the first time.           

A．where, where

B．that, where

C．that, that

D．where, that