There are five people in the room, but I know _____.

A．both of them

B．none of them

C．all of them

D．neither of them

骨盆弓无断裂骨折是指（）。

A.耻骨联合分离

B.髂前上、下棘骨折

C.一侧骶髂关节脱位

D.骶骨骨折

E.一侧骶髂关节附近的髂骨骨折