There are many kinds of birds in Australia, and over 140 species of snakes, ______are extremely dangerous.

A．many of those

B．many of that

C．many of which

D．many of what

局部紧急停车的特点就是能在短时间内恢复装置开车，处理的原则是各系统能保持原始状态的就尽量维持。