加强水域岸线空间管控，将岸线划分为哪几个区（）
A.禁止开发区
B.保护区
C.保留区
D.控制利用区
E.开发利用区
参考答案：B, C, D, E
方程3x2-8xy+7y2-4x+2y=109的整数解是______．
Only after liberation to be treated as human beings.
A．did they begin
B．they had begun
C．they did begin
D．had they begun
