下列结构形式中，最适合于高层旅馆的是（）。
A.框架结构；
B.框架-剪力墙结构；
C.剪力墙结构；
D.筒体结构；
参考答案：C
_____ I heard his voice trembling did I realize what trouble he was in.
A．Only when
B．Until when
C．No sooner had
D．Hardly had
我国目前用营养素的（）值作为个体每日摄入该营养素的目标值？
A.RDA
B.UL
C.EAR
D.RNI
