The professor, _____ some of his assistants, _____ to attend our discussion this afternoon.

A．and; is

B．as well as; is

C．or; are

D．except for; are

下列属于网络直接调研方法的是（）。

A.利用专业网站

B.利用网络问卷

C.利用新闻组

D.利用网上发布的调研报告