如图所示,边长为L的正方形金属框ABCD质量为m,电阻为R,用细线把它悬挂于一个有界的匀强磁场中,金属框的下半部处于磁场内,磁场方向与线框平面垂直.磁场随时间变化规律为B = kt(k > 0).求: (1)线框中感应电流的方向; (2)线框中感应电动势的大小; (3)从t=0时刻开始,经多长时间细线的拉力为零?
Mother gets up ______ than any others in my family. [ ]
A. more earlier B. less earlier
C. far earlier D. farther early