He is a man of ____ and he had a lot of interesting ____ in his life.

A．much experience, experiences

B．many experiences, experience

C．much experience, experience

D．many experiences, experiences

低钾血症及低钙血症纠正后，神经、肌肉及中枢神经系统功能亢进症状仍无好转，应考虑是：（）

A.低钾血症

B.低钙血症

C.低镁血症

D.低钠血症

E.低磷血症