A:①②
B:②④
C:②③
D:③④
Lucy is ______university student. She likes playing ______ piano.
已知:如图,在正方形ABCD外取一点E,连接AE、BE、DE.过点A作AE的垂线交DE于点P.若AE=AP=1,PB=6.下列结论:①△APD≌△AEB;②点B到直线AE的距离为3;③EB⊥ED;④S△APD+S△APB=0.5+2.其中正确结论的序号是
若一组数据2,3,x,5,7的众数为7,则这组数据的中位数为 ( )