题目

如图所示，平行金属板中带电质点P原处于静止状态，不考虑电流表和电压表对电路的影响，当滑动变阻器的滑片向b端移动时，则（       ） A．R3上消耗的功率逐渐增大 B．电流表读数减小 C．电压表读数减大     D．质点P将向下运动  答案：       D按要求改写句子【1】There were some black clouds in the sky. (改为否定句)There ______ ______ black clouds in the sky.【2】He wore a lot of bottles.（改为一般疑问句）________ he __________ a lot of bottles?【3】Mike bought some oranges on the farm.（对画线部分提问）__________ did Mike __________ on the farm?【4】She did homework last night.（改为否定句）She _______ _______ homework last night.