—I think sixteen-year-olds should be allowed to drive.

— ______. They aren’t serious enough at that age.

A．I agree

B．I disagree

C．I think so

D．That’s right

两个电阻串联后接在电源上，它们消耗电功率之比                    ，若将它们并联起来，接到电源上，消耗的电功率之比                    ，若保持电源电压不变，则串联与并联消耗的总功率之比                    。