下列与维持身体的平衡有关的结构是( )
A:半规管和耳蜗
B:前庭和半规管
C:鼓膜和听小骨
D:前庭和耳蜗
“One tree can't make a forest” tells us no one would be heroes ____ (with) his friends.
用减法验算294+406=700的算式是( )。