— Are the rulers _____?

— Yes, they're _____. [ ]

A. your; our

B. her; I

C. him; ours

D. yours; ours

现代传播效果研究兴起的媒介背景时期是（）.

A.政党报刊

B.黄色报刊

C.大众报刊

D.电子媒介