Jane _____ these families of chimps for many years and helped people understand how much they behave like humans.

A．had studied

B．studied

C．studies

D．has studied

漏斗骨盆行骨盆测量时，对的是（）。

A.入口平面各径线小于正常值

B.中骨盆及出口平面径线在正常范围

C.骨棘间径大于12cm

D.耻骨弓角度大于90度

E.双侧盆壁向内倾斜