Hong Kong was so busy over the Spring Festival that all the hotel accommodation was full. She phoned several hotels but none of them had a _________ room.

A．cheap

B．nice

C．separate

D．vacant

根据《建筑工程建筑面积计算规范》，关于多层建筑物屋顶内和场馆看台下建筑面积的计算，说法正确的是（）。

A.设计不利用的净高超过2.10m的部位计算全面积

B.设计加以利用时净高2.0m的部位计算1/2面积

C.净高在1.20~2.10m的部位计算1/2面积

D.层高在2.20m及以上者计算全面积