The Internet is a wonderful discovery, _____ of great significance to people's lives. [ ]

A. as is I think

B. which I think it is

C. as I think

D. which I think is

利用就业机构进行征召的优点是（）。

A.应聘者面广

B.招聘时间短

C.应聘者素质较高

D.录用后员工很难形成裙带关系