—Jenny and Joe have________recently.
—How come？As far as I know，they have been good friends for many years.
A：picked up
B：made up
C：split up
D：given up
—________
下列有关金属的说法中不正确的是（ ）
已知x2+4x-1=0，求代数式(2x+1)2-(x+2)(x-2)-x(x-4)的值．
下列表述中，能体现意志具有强大力量的是（ ）①天下兴亡，匹夫有责②有毅力者成，反者败③志不强者智不达④锲而不舍，金石可镂
