A:灯泡变亮,电流表示数不变
B:灯泡变暗,电流表示数不变
C:灯泡亮度不变,电流表示数增大
D:灯泡亮度不变,电流表示数减小
— You don't look well. ?
— I have a sore back.
— How was your stay in Hong Kong?
—________. And it was a pity that I couldn't stay there longer.
如图所示,阴影部分的面积为( )