— What do you think of the cake?
— I like it very much. It tastes .
A:good
B:terrible
C:well
小灯泡通电后其电流I随所加电压U变化的图线如图所示,P为图线上一点,PN为图线的切线,PQ为U轴的垂线,PM为I轴的垂线.则下列说法中正确的是( )