Tom has much difficulty _____Chinese so he often asks me _____ help.[ ]

A. to understand, with              

B. understanding, of

C. to understand, for                

D. understanding, for

什么既是一种医德修养方法，又是—种医德修养境界

A．学习

B．积善

C．自我反省

D．慎独

E．实践