下列哪种构件属于船体纵向构件（）。
A．壁肘板
B．旁底桁
C．肋骨
D．肋板
参考答案：B
三因制宜即治疗疾病要根据季节、地区及人体体质、性别、年龄等不同而制定适宜的治疗方法。( )
You can not imagine how much I _____ on this dress. [ ]
A. paid
B. took
C. cost
D. spent
