．It is very difficult to     his mind because he is always changing his mind.

A．see

B．read

C．understand

D．find

把水肿分为风水，正水、皮水、石水、黄汗五种类型的是（）

A.《内经》

B.《金匮要略》

C.《诸病源候论》

D.《东垣十书》

E.《丹溪心法》