A:why did you get it
B:when will you get it
C:where you got it
D:how will you get it
观察一列数: 12 , −25 , 310 , −417 , 526 , −637 …根据规律,请你写出第10个数是____.
细胞衰老和凋亡对维持个体的正常生长发育及生命活动具有重要意义。下列叙述错误的是