依据现行《建筑设计防火规范》的规定,两栋建筑高度相同的一、二级耐火等级旅馆之间的防火间距最小为()m。
A.6
B.7
C.9
D.10
参考答案:A
You can never be ________ when crossing the street.
A.very careful
B.too careful
C.carefully enough
D.enough careful