John was________to learn the news that he was rejected by the committee.[ ]

A．let down  

B．put down

C．noted down  

D．taken down

下列何种组织或病变在反相位图像上常有明显信号衰减（）

A.皮下脂肪

B.正常肝组织

C.肝脏血管瘤

D.肝细胞癌

E.脂肪肝