It is often recommended that children________chances to get close to nature.[ ]

A. are offered  

B. be offered

C. should offer    

D. must be offered

骨盆入口略呈三角形，两侧壁内聚，坐骨棘突出，耻骨弓较窄，骶坐切迹窄呈高弓形，骶骨较直而前倾，出口后矢状径较短为()
骨盆入口呈横椭圆形，髂骨翼宽即浅，入口横径较前后径稍长，耻骨较宽，两侧坐骨棘间径≥10cm，为何种骨盆()

A．类人猿型

B．扁平型

C．均小骨盆

D．女型骨盆

E．男型