在正常使用条件下的下列钢筋混凝土结构中，何项对于层间最大位移与层高之比限制的要求最严格（）？

A.高度不大于50m的框架结构

B.高度为180m的剪力墙结构

C.高度为160m的框架一核心筒结构

D.高度为175m的筒中筒结构

______in March, that so many people had on their light wears.

A．So hot did the weather become

B．So became the hot weather

C．Hot the weather became so

D．So hot became the weather