At the computer operation test, one is supposed to stay at his own machine, keep his eyes on his screen, _______ to anyone.

A．and not to speak

B．but could not speak

C．instead of speaking

D．or rather speak

规划环境影响评价的评价方法不包括( )。

A．加权比较法
B．层次分析法
C．环境承载力分析
D．投入产出法