题目

如图，均匀带正电的绝缘圆环a与金属圆环b同心共面放置，当a绕O点在其所在平面内旋转时，b中产生顺时针方向的感应电流，且具有收缩趋势，由此可知，圆环a( ) A．顺时针加速旋转                      B．顺时针减速旋转 C．逆时针加速旋转                      D．逆时针减速旋转Andres is the only boy of the after-school program, ________ students learn to cook and are taught to eat healthy．A.thatB.whichC.whoseD.where