A:that it was what
B:what it was that
C:what was it that
D:that was it what
下列依次属于系统、器官、组织、细胞的一组是( )
杯子里的开水越放越凉,下列图象中可以大致反映这杯水的温度T(℃)与时间变化t(分钟)之间变化关系的是( )