题目

Why do people drink too much, eat too much, smoke cigarettes or take drugs? What’s to blame for all the bad behavior? Most people would say that, while these self-destructive acts can have many root causes, they all have one obvious thing in common: they are all examples of failures of self-control, lacking the will power to resist them.        According to a recent study, however, if you really think about it, something about that simple answer doesn’t quite make sense. In fact, it turns out that sometimes it’s having will power that really gets you into trouble.      两只标有“PZ220-60”字样的灯泡串联接在220伏的电路中，两只灯泡的总功率为　　　[　　] A．120瓦　　　B．30瓦　　　C．15瓦　　　D．60瓦