We often have to stay up for our study though we             to have enough sleep. [ ]

A.told

B.have told

C.are told

D.were told

关于能谱CT的临床应用。

能谱成像时，实现真假痛风结石分析时基于的基物质图是（）。

A.水-碘图

B.钙-水图

C.碘-钙图

D.尿酸-钙图

E.脂-水图

F.钙-脂图