如图所示，电源电压U=18V，小灯泡L的额定电压为9V当滑动变阻器的滑片P移至中点时，小灯泡L正常发光；当滑片P移至最右端时，小灯泡L的实际功率为6W，则小灯泡额定功率和滑动变阻器的最大阻值分别为（　　）

A．13.5W 6Ω

B．6W 13.5Ω

C．6W 12Ω

D．13.5W 12Ω

I really don't know how anyone can _____ your constant complaint; no wonder you have lost so many friends.

A．come up with

B．end up with

C．put up with

D．keep up with