They have socks _____ all colors for only three dollars.    [ ]

A. at

B. in

C. on

D. of

梨状肌下缘在体表投影区的直线是（）

A.骶管裂孔与股骨大转子连线

B.髂前上棘与股骨大转子连线

C.髂后上棘与股骨大转子连线

D.坐骨结节与大转子连线

E.从尾骨尖与髂后上棘连线的中点，向股骨大转子所作连线