我国北方民居具有的特点是( )
A:屋顶坡度较小
B:屋顶坡度较大
C:墙体较薄
D:墙体较高
如果让你设计一个实验,验证温度对鼠妇的影响,下列设计中正确的是( )
It is of you to help so many people and it is important us to be kind to others.