My brother _____  to the ground while ____  his bicycle and hurt his leg .

A． falls; is he riding

B． fell; he was riding

C． fall; he is riding

D． felt; was he riding

无重叠畸形的股骨干中1/3骨折，因受内收肌收缩的影响，而有成角的倾向，成角的方向是（）

A.向前

B.向外

C.向内

D.向后

E.向上