在受众态度的构成要素中，具有基础性质的成分是( )
A．需要
B．认知
C．情绪情感
D．行为意向
参考答案：B
Safety in school is of great concern because of the accidents ______ students got injured or killed. [ ]
A. in which
B. when
C. that
D. for which
—Tom came to work last Friday ,but no one has seen him since.
— he have had an accident ?
A．Should
B．Must
C．Might
D．Could
