—The advertisement says this kind of camera is wonderful.

—Oh, don’t just believe the advertisement. The camera is        it says.

A．as good as

B．not as good as

C．as well as

D．not as well as

关于脑电图的叙述正确的是

A．是中枢神经系统各部位的综合电变化图

B．是皮层的自发电位变化图

C．正常成人安静、清醒、闭目时多为β波

D．兴奋、觉醒时多为α波

E．通常脑电图是直接在皮层表面引导的电位变化