What was the weather like in the mountains yesterday?
A:Sunny.
B:Windy.
C:Snowy.
一个长方体长20分米,宽和高都是5分米,体积是____立方分米.
我国省级行政区的设立源于( )
已知a∈R且a≠0,则“1a<1”是 “a>1”的( )