Tina got ill yesterday. She felt a little _______ this morning. [ ]

A. ill

B. worse

C. worst

D. the worst

带蓄电池荧光灯的应急照明，平时接交流市电，通过（）变为直流电，向蓄电池充电。

A、逆变器

B、整流器

C、继电器

D、浪涌