Linda didn't go to school yesterday because she had to _____ her sick mother at home.     [ ]

A. look at

B. look for

C. look after

D. look up

对传播的要素之一受传者描述正确的是（）

A.传播行为的引发者

B.在传播过程中信息的主动发出者

C.必须是个人

D.必须是群体

E.大量的受传者称为受众