一大群蚂蚁在搬一粒小麦,体现了生物之间有( )
A:捕食关系
B:合作关系
C:竞争关系
D:分工关系
如图所示,由门电路组成的电路,输出端为“1”,指示灯L亮,输出端为“0”,指示灯L不亮,现要使灯L亮,则A、B两输入端分别是( )
.
Fire is very dangerous. It can ____people. We ____be careful with fire. We mustn't play near fires. We mustn't play with matches. We mustn't ____in the forest. When we see a fire, we must go outside ____,but ____use the lift.