生产经营单位（）为从业人员缴纳保险费，从而化解企业风险，保障从业人员的基本权利。
参考答案：必须
Nobel Prize winner Mo Yan said prize the Academy had awarded to him was_______ victory of literature, but not a victory of politics.
A．the, the
B．the, a
C．a, a
D．a, the
髌骨软骨的营养主要来自（）
A.关节滑液
B.股四头肌的血液供应
C.关节囊的血液供应
D.髌韧带的血液供应
E.髌骨的滋养动脉
