The ________ on his face told me that he wasn't satisfied with my answer.[ ]

A．impression  

B．sight

C．appearance  

D．expression

把重5N、体积为0.6dm³的物体投入水中．若不计水的阻力，当物体静止时，下列说法中正确的是 [ ]

A.物体漂浮，浮力为6N

B.物体悬浮，浮力为5N

C.物体漂浮，浮力为5N

D.物体沉底，浮力为6N