用下面的字组词，再写一句话。

志(      )                                                                                                                                  

提(      )                                                                                                                                   

喝(      )                                                                                                                                   

在OSI参考模型中能实现路由选择、拥塞控制与互连功能的层是（）。

A．传输层

B．应用层

C．网络层

D．物理层