— Are you content with her lecture?

— Nowhere near that. It         .

A．may have been good

B．couldn’t have been worse

C．can’t be better

D．must be better

会导致电磁泄露的有（）。

A、显示器

B、开关电路及接地系统

C、计算机系统的电源线

D、机房内的电话线

E、信号处理电路