Last year I was often ill, but now I am       good health.

A．at

B．of

C．in

D．under

关于河流、湖泊的说法，正确的有[ ]

A．不直接流入海洋的河流叫内流河      

B．流出国境以外的河流

C．内流湖多为咸水湖                

D．青海湖是我国最大的湖泊