Though the teacher had explained it three times, many students still felt ____. It was so difficult a

physics problem.

[      ]

A. amused

B. excited

C. frightened

D. confused

用以核算信用社吸收的各种定期存款利息支出的会计科目是（）。

A、应计利息

B、应付利息

C、利息支出

D、利息收入