It has been made __________ public that anyone who does harm to the environment in         __________ public places will be blamed by __________ public.

A．the, the, the

B．/;the; the

C．/; /; the

D．the; /; the

设A是4×6矩阵，则齐次线性方程组AX=0解的情况是（）。

A．无解

B．只有零解

C．有非零解

D．不一定