The athlete hurt his foot in the race. ______, he missed the chance to win it.

A．consequently

B．unfortunately

C．potentially

D．absolutely

在汽车电源电路中，点燃大客车的日光灯，低压直流电需要通过（）处理后，再进行升压才能得到可用的电压。

A.变压器

B.稳流器

C.硅整流器

D.逆变器