A.one's creativity needs stimulating by the others. B.Most people's creativity is weak and rare. C.All individuals have the ability of creativity. D.Creativity is something only a few people have.
【简答题】如图,正比例函数y=2x与反比例函数 y= k x (k>0) 的图象相交于A、C两点,过 点A作AD垂直x轴,垂足为D,过点C作CB垂直x轴,垂足为B,连接AB和CD.已知点A的横坐标为2. (1)求k的值; (2)求证:四边形ABCD是平行四边形; (3)P、Q两点是坐标轴上的动点(P为正半轴上的点,Q为负半轴上的点),当以A、C、P、Q四点为顶点的四边形是矩形时,求P、Q两点的坐标.