用如图所示的电路测量小灯泡的功率，当滑动变阻器滑片从a向b滑动时，小灯泡消耗的功率和其亮度将分别：

A．变大变暗

B．变小变亮

C．变大变亮

D．变小变暗

Nearly four hundred supermarkets in Beijing are preparing to dim(使暗淡) their lights ________ the "Earth Hour 2010" on Saturday night．

A．honor

B．honoring

C．to honor

D．having honored